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gtk/gtk/gtkscrolledwindow.c
Carlos Garnacho e9fe270e94 gtk/scrolledwindow: Handle full scroll sequences only 
In order to do this, leverage smooth scroll handling into the capture
phase scroll controller, controlled by ::scroll-begin in the propagation
phase controller.

There's 2 cases here:
- A child widget handles scroll. The scrolled window does not get
  ::scroll-begin, the child widget handles the full scroll sequence.
- No child handles scroll, the scrolled window gets ::scroll-begin,
  and transfers control of scrolling to the capture phase controller.
  As scrolling is performed, the pointer may fall into scrollable children,
  but the scrolled window will be capturing the scroll events, so these
  won't be seen by the child widgets.

Fixes: https://gitlab.gnome.org/GNOME/gtk/-/issues/593
2020-12-12 01:42:42 +01:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkscrolledwindow.h"
#include "gtkadjustment.h"
#include "gtkadjustmentprivate.h"
#include "gtkbuildable.h"
#include "gtkdragsource.h"
#include "gtkeventcontrollermotion.h"
#include "gtkeventcontrollerscroll.h"
#include "gtkeventcontrollerprivate.h"
#include "gtkgesturedrag.h"
#include "gtkgesturelongpress.h"
#include "gtkgesturepan.h"
#include "gtkgesturesingle.h"
#include "gtkgestureswipe.h"
#include "gtkgestureprivate.h"
#include "gtkintl.h"
#include "gtkkineticscrollingprivate.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkprogresstrackerprivate.h"
#include "gtkscrollable.h"
#include "gtkscrollbar.h"
#include "gtksettingsprivate.h"
#include "gtksnapshot.h"
#include "gtkstylecontextprivate.h"
#include "gtktypebuiltins.h"
#include "gtkviewport.h"
#include "gtkwidgetprivate.h"
#include <math.h>
/**
* SECTION:gtkscrolledwindow
* @Short_description: Adds scrollbars to its child widget
* @Title: GtkScrolledWindow
* @See_also: #GtkScrollable, #GtkViewport, #GtkAdjustment
*
* GtkScrolledWindow is a container that accepts a single child widget, makes
* that child scrollable using either internally added scrollbars or externally
* associated adjustments, and optionally draws a frame around the child.
*
* Widgets with native scrolling support, i.e. those whose classes implement the
* #GtkScrollable interface, are added directly. For other types of widget, the
* class #GtkViewport acts as an adaptor, giving scrollability to other widgets.
* gtk_scrolled_window_set_child() intelligently
* accounts for whether or not the added child is a #GtkScrollable. If it isn’t,
* #GtkScrolledWindow wraps the child in a #GtkViewport and adds that for you.
* Therefore, you can just add any child widget and not worry about the details.
*
* If gtk_scrolled_window_set_child() has added a #GtkViewport for you, you can remove
* both your added child widget from the #GtkViewport, and the #GtkViewport
* from the GtkScrolledWindow, like this:
*
* |[<!-- language="C" -->
* GtkWidget *scrolled_window = gtk_scrolled_window_new ();
* GtkWidget *child_widget = gtk_button_new ();
*
* // GtkButton is not a GtkScrollable, so GtkScrolledWindow will automatically
* // add a GtkViewport.
* gtk_box_append (GTK_BOX (scrolled_window),
* child_widget);
*
* // Either of these will result in child_widget being unparented:
* gtk_box_remove (GTK_BOX (scrolled_window),
* child_widget);
* // or
* gtk_box_remove (GTK_BOX (scrolled_window),
* gtk_bin_get_child (GTK_BIN (scrolled_window)));
* ]|
*
* Unless #GtkScrolledWindow:hscrollbar-policy and #GtkScrolledWindow:vscrollbar-policy
* are GTK_POLICY_NEVER or GTK_POLICY_EXTERNAL,
* GtkScrolledWindow adds internal #GtkScrollbar widgets around its child. The
* scroll position of the child, and if applicable the scrollbars, is controlled
* by the #GtkScrolledWindow:hadjustment and #GtkScrolledWindow:vadjustment
* that are associated with the GtkScrolledWindow. See the docs on #GtkScrollbar
* for the details, but note that the “step_increment” and “page_increment”
* fields are only effective if the policy causes scrollbars to be present.
*
* If a GtkScrolledWindow doesn’t behave quite as you would like, or
* doesn’t have exactly the right layout, it’s very possible to set up
* your own scrolling with #GtkScrollbar and for example a #GtkGrid.
*
* # Touch support
*
* GtkScrolledWindow has built-in support for touch devices. When a
* touchscreen is used, swiping will move the scrolled window, and will
* expose 'kinetic' behavior. This can be turned off with the
* #GtkScrolledWindow:kinetic-scrolling property if it is undesired.
*
* GtkScrolledWindow also displays visual 'overshoot' indication when
* the content is pulled beyond the end, and this situation can be
* captured with the #GtkScrolledWindow::edge-overshot signal.
*
* If no mouse device is present, the scrollbars will overlaid as
* narrow, auto-hiding indicators over the content. If traditional
* scrollbars are desired although no mouse is present, this behaviour
* can be turned off with the #GtkScrolledWindow:overlay-scrolling
* property.
*
* # CSS nodes
*
* GtkScrolledWindow has a main CSS node with name scrolledwindow.
* It gets a .frame style class added when #GtkScrolledWindow:has-frame
* is %TRUE.
*
* It uses subnodes with names overshoot and undershoot to
* draw the overflow and underflow indications. These nodes get
* the .left, .right, .top or .bottom style class added depending
* on where the indication is drawn.
*
* GtkScrolledWindow also sets the positional style classes (.left,
* .right, .top, .bottom) and style classes related to overlay
* scrolling (.overlay-indicator, .dragging, .hovering) on its scrollbars.
*
* If both scrollbars are visible, the area where they meet is drawn
* with a subnode named junction.
*
* # Accessibility
*
* GtkScrolledWindow uses the %GTK_ACCESSIBLE_ROLE_GROUP role.
*/
/* scrolled window policy and size requisition handling:
*
* gtk size requisition works as follows:
* a widget upon size-request reports the width and height that it finds
* to be best suited to display its contents, including children.
* the width and/or height reported from a widget upon size requisition
* may be overridden by the user by specifying a width and/or height
* other than 0 through gtk_widget_set_size_request().
*
* a scrolled window needs (for implementing all three policy types) to
* request its width and height based on two different rationales.
* 1) the user wants the scrolled window to just fit into the space
* that it gets allocated for a specific dimension.
* 1.1) this does not apply if the user specified a concrete value
* value for that specific dimension by either specifying usize for the
* scrolled window or for its child.
* 2) the user wants the scrolled window to take as much space up as
* is desired by the child for a specific dimension (i.e. POLICY_NEVER).
*
* also, kinda obvious:
* 3) a user would certainly not have chosen a scrolled window as a container
* for the child, if the resulting allocation takes up more space than the
* child would have allocated without the scrolled window.
*
* conclusions:
* A) from 1) follows: the scrolled window shouldn’t request more space for a
* specific dimension than is required at minimum.
* B) from 1.1) follows: the requisition may be overridden by usize of the scrolled
* window (done automatically) or by usize of the child (needs to be checked).
* C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
* child’s dimension.
* D) from 3) follows: the scrolled window child’s minimum width and minimum height
* under A) at least correspond to the space taken up by its scrollbars.
*/
/* Kinetic scrolling */
#define MAX_OVERSHOOT_DISTANCE 100
#define DECELERATION_FRICTION 4
#define OVERSHOOT_FRICTION 20
#define VELOCITY_ACCUMULATION_FLOOR 0.33
#define VELOCITY_ACCUMULATION_CEIL 1.0
#define VELOCITY_ACCUMULATION_MAX 6.0
/* Animated scrolling */
#define ANIMATION_DURATION 200
/* Overlay scrollbars */
#define INDICATOR_FADE_OUT_DELAY 2000
#define INDICATOR_FADE_OUT_DURATION 1000
#define INDICATOR_FADE_OUT_TIME 500
#define INDICATOR_CLOSE_DISTANCE 5
#define INDICATOR_FAR_DISTANCE 10
/* Scrolled off indication */
#define UNDERSHOOT_SIZE 40
typedef struct _GtkScrolledWindowClass GtkScrolledWindowClass;
struct _GtkScrolledWindow
{
GtkWidget parent_instance;
};
struct _GtkScrolledWindowClass
{
GtkWidgetClass parent_class;
/* Unfortunately, GtkScrollType is deficient in that there is
* no horizontal/vertical variants for GTK_SCROLL_START/END,
* so we have to add an additional boolean flag.
*/
gboolean (*scroll_child) (GtkScrolledWindow *scrolled_window,
GtkScrollType scroll,
gboolean horizontal);
void (* move_focus_out) (GtkScrolledWindow *scrolled_window,
GtkDirectionType direction);
};
typedef struct
{
GtkWidget *scrollbar;
gboolean over; /* either mouse over, or while dragging */
gint64 last_scroll_time;
guint conceil_timer;
double current_pos;
double source_pos;
double target_pos;
GtkProgressTracker tracker;
guint tick_id;
guint over_timeout_id;
} Indicator;
typedef struct
{
GtkWidget *child;
GtkWidget *hscrollbar;
GtkWidget *vscrollbar;
GtkCssNode *overshoot_node[4];
GtkCssNode *undershoot_node[4];
GtkCssNode *junction_node;
Indicator hindicator;
Indicator vindicator;
GtkCornerType window_placement;
guint has_frame : 1;
guint hscrollbar_policy : 2;
guint vscrollbar_policy : 2;
guint hscrollbar_visible : 1;
guint vscrollbar_visible : 1;
guint focus_out : 1; /* used by ::move-focus-out implementation */
guint overlay_scrolling : 1;
guint use_indicators : 1;
guint auto_added_viewport : 1;
guint propagate_natural_width : 1;
guint propagate_natural_height : 1;
guint smooth_scroll : 1;
int min_content_width;
int min_content_height;
int max_content_width;
int max_content_height;
guint scroll_events_overshoot_id;
/* Kinetic scrolling */
GtkGesture *long_press_gesture;
GtkGesture *swipe_gesture;
GtkKineticScrolling *hscrolling;
GtkKineticScrolling *vscrolling;
gint64 last_deceleration_time;
/* These two gestures are mutually exclusive */
GtkGesture *drag_gesture;
GtkGesture *pan_gesture;
double drag_start_x;
double drag_start_y;
guint kinetic_scrolling : 1;
guint in_drag : 1;
guint deceleration_id;
double x_velocity;
double y_velocity;
double unclamped_hadj_value;
double unclamped_vadj_value;
} GtkScrolledWindowPrivate;
enum {
PROP_0,
PROP_HADJUSTMENT,
PROP_VADJUSTMENT,
PROP_HSCROLLBAR_POLICY,
PROP_VSCROLLBAR_POLICY,
PROP_WINDOW_PLACEMENT,
PROP_HAS_FRAME,
PROP_MIN_CONTENT_WIDTH,
PROP_MIN_CONTENT_HEIGHT,
PROP_KINETIC_SCROLLING,
PROP_OVERLAY_SCROLLING,
PROP_MAX_CONTENT_WIDTH,
PROP_MAX_CONTENT_HEIGHT,
PROP_PROPAGATE_NATURAL_WIDTH,
PROP_PROPAGATE_NATURAL_HEIGHT,
PROP_CHILD,
NUM_PROPERTIES
};
/* Signals */
enum
{
SCROLL_CHILD,
MOVE_FOCUS_OUT,
EDGE_OVERSHOT,
EDGE_REACHED,
LAST_SIGNAL
};
static void gtk_scrolled_window_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_scrolled_window_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_scrolled_window_dispose (GObject *object);
static void gtk_scrolled_window_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot);
static void gtk_scrolled_window_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline);
static gboolean gtk_scrolled_window_focus (GtkWidget *widget,
GtkDirectionType direction);
static gboolean gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
GtkScrollType scroll,
gboolean horizontal);
static void gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
GtkDirectionType direction_type);
static void gtk_scrolled_window_relative_allocation(GtkScrolledWindow *scrolled_window,
GtkAllocation *allocation);
static void gtk_scrolled_window_inner_allocation (GtkScrolledWindow *scrolled_window,
GtkAllocation *rect);
static void gtk_scrolled_window_allocate_scrollbar (GtkScrolledWindow *scrolled_window,
GtkWidget *scrollbar,
GtkAllocation *allocation);
static void gtk_scrolled_window_allocate_child (GtkScrolledWindow *swindow,
int width,
int height);
static void gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
gpointer data);
static void gtk_scrolled_window_adjustment_value_changed (GtkAdjustment *adjustment,
gpointer data);
static gboolean gtk_widget_should_animate (GtkWidget *widget);
static void gtk_scrolled_window_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum_size,
int *natural_size,
int *minimum_baseline,
int *natural_baseline);
static void gtk_scrolled_window_map (GtkWidget *widget);
static void gtk_scrolled_window_unmap (GtkWidget *widget);
static void gtk_scrolled_window_realize (GtkWidget *widget);
static void _gtk_scrolled_window_set_adjustment_value (GtkScrolledWindow *scrolled_window,
GtkAdjustment *adjustment,
double value);
static void gtk_scrolled_window_cancel_deceleration (GtkScrolledWindow *scrolled_window);
static gboolean _gtk_scrolled_window_get_overshoot (GtkScrolledWindow *scrolled_window,
int *overshoot_x,
int *overshoot_y);
static void gtk_scrolled_window_start_deceleration (GtkScrolledWindow *scrolled_window);
static void gtk_scrolled_window_update_use_indicators (GtkScrolledWindow *scrolled_window);
static void remove_indicator (GtkScrolledWindow *sw,
Indicator *indicator);
static gboolean maybe_hide_indicator (gpointer data);
static void indicator_start_fade (Indicator *indicator,
double pos);
static void indicator_set_over (Indicator *indicator,
gboolean over);
static void install_scroll_cursor (GtkScrolledWindow *scrolled_window);
static void uninstall_scroll_cursor (GtkScrolledWindow *scrolled_window);
static void scrolled_window_scroll (GtkScrolledWindow *scrolled_window,
double delta_x,
double delta_y,
GtkEventControllerScroll *scroll);
static guint signals[LAST_SIGNAL] = {0};
static GParamSpec *properties[NUM_PROPERTIES];
static void gtk_scrolled_window_buildable_init (GtkBuildableIface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkScrolledWindow)
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
gtk_scrolled_window_buildable_init))
static GtkBuildableIface *parent_buildable_iface;
static void
gtk_scrolled_window_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *type)
{
if (GTK_IS_WIDGET (child))
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW(buildable), GTK_WIDGET (child));
else
parent_buildable_iface->add_child (buildable, builder, child, type);
}
static void
gtk_scrolled_window_buildable_init (GtkBuildableIface *iface)
{
parent_buildable_iface = g_type_interface_peek_parent (iface);
iface->add_child = gtk_scrolled_window_buildable_add_child;
}
static void
add_scroll_binding (GtkWidgetClass *widget_class,
guint keyval,
GdkModifierType mask,
GtkScrollType scroll,
gboolean horizontal)
{
guint keypad_keyval = keyval - GDK_KEY_Left + GDK_KEY_KP_Left;
gtk_widget_class_add_binding_signal (widget_class,
keyval, mask,
"scroll-child",
"(ib)", scroll, horizontal);
gtk_widget_class_add_binding_signal (widget_class,
keypad_keyval, mask,
"scroll-child",
"(ib)", scroll, horizontal);
}
static void
add_tab_bindings (GtkWidgetClass *widget_class,
GdkModifierType modifiers,
GtkDirectionType direction)
{
gtk_widget_class_add_binding_signal (widget_class,
GDK_KEY_Tab, modifiers,
"move-focus-out",
"(i)", direction);
gtk_widget_class_add_binding_signal (widget_class,
GDK_KEY_KP_Tab, modifiers,
"move-focus-out",
"(i)", direction);
}
static void
motion_controller_leave (GtkEventController *controller,
GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
if (priv->use_indicators)
{
indicator_set_over (&priv->hindicator, FALSE);
indicator_set_over (&priv->vindicator, FALSE);
}
}
static void
update_scrollbar_positions (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
gboolean is_rtl;
if (priv->hscrollbar != NULL)
{
if (priv->window_placement == GTK_CORNER_TOP_LEFT ||
priv->window_placement == GTK_CORNER_TOP_RIGHT)
{
gtk_widget_add_css_class (priv->hscrollbar, "bottom");
gtk_widget_remove_css_class (priv->hscrollbar, "top");
}
else
{
gtk_widget_add_css_class (priv->hscrollbar, "top");
gtk_widget_remove_css_class (priv->hscrollbar, "bottom");
}
}
if (priv->vscrollbar != NULL)
{
is_rtl = _gtk_widget_get_direction (GTK_WIDGET (scrolled_window)) == GTK_TEXT_DIR_RTL;
if ((is_rtl &&
(priv->window_placement == GTK_CORNER_TOP_RIGHT ||
priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(!is_rtl &&
(priv->window_placement == GTK_CORNER_TOP_LEFT ||
priv->window_placement == GTK_CORNER_BOTTOM_LEFT)))
{
gtk_widget_add_css_class (priv->vscrollbar, "right");
gtk_widget_remove_css_class (priv->vscrollbar, "left");
}
else
{
gtk_widget_add_css_class (priv->vscrollbar, "left");
gtk_widget_remove_css_class (priv->vscrollbar, "right");
}
}
}
static void
gtk_scrolled_window_direction_changed (GtkWidget *widget,
GtkTextDirection previous_dir)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
update_scrollbar_positions (scrolled_window);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->direction_changed (widget, previous_dir);
}
static void
gtk_scrolled_window_compute_expand (GtkWidget *widget,
gboolean *hexpand,
gboolean *vexpand)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
if (priv->child)
{
*hexpand = gtk_widget_compute_expand (priv->child, GTK_ORIENTATION_HORIZONTAL);
*vexpand = gtk_widget_compute_expand (priv->child, GTK_ORIENTATION_VERTICAL);
}
else
{
*hexpand = FALSE;
*vexpand = FALSE;
}
}
static GtkSizeRequestMode
gtk_scrolled_window_get_request_mode (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
if (priv->child)
return gtk_widget_get_request_mode (priv->child);
else
return GTK_SIZE_REQUEST_CONSTANT_SIZE;
}
static void
gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
gobject_class->set_property = gtk_scrolled_window_set_property;
gobject_class->get_property = gtk_scrolled_window_get_property;
gobject_class->dispose = gtk_scrolled_window_dispose;
widget_class->snapshot = gtk_scrolled_window_snapshot;
widget_class->size_allocate = gtk_scrolled_window_size_allocate;
widget_class->measure = gtk_scrolled_window_measure;
widget_class->focus = gtk_scrolled_window_focus;
widget_class->map = gtk_scrolled_window_map;
widget_class->unmap = gtk_scrolled_window_unmap;
widget_class->realize = gtk_scrolled_window_realize;
widget_class->direction_changed = gtk_scrolled_window_direction_changed;
widget_class->compute_expand = gtk_scrolled_window_compute_expand;
widget_class->get_request_mode = gtk_scrolled_window_get_request_mode;
class->scroll_child = gtk_scrolled_window_scroll_child;
class->move_focus_out = gtk_scrolled_window_move_focus_out;
properties[PROP_HADJUSTMENT] =
g_param_spec_object ("hadjustment",
P_("Horizontal Adjustment"),
P_("The GtkAdjustment for the horizontal position"),
GTK_TYPE_ADJUSTMENT,
GTK_PARAM_READWRITE|G_PARAM_CONSTRUCT);
properties[PROP_VADJUSTMENT] =
g_param_spec_object ("vadjustment",
P_("Vertical Adjustment"),
P_("The GtkAdjustment for the vertical position"),
GTK_TYPE_ADJUSTMENT,
GTK_PARAM_READWRITE|G_PARAM_CONSTRUCT);
properties[PROP_HSCROLLBAR_POLICY] =
g_param_spec_enum ("hscrollbar-policy",
P_("Horizontal Scrollbar Policy"),
P_("When the horizontal scrollbar is displayed"),
GTK_TYPE_POLICY_TYPE,
GTK_POLICY_AUTOMATIC,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
properties[PROP_VSCROLLBAR_POLICY] =
g_param_spec_enum ("vscrollbar-policy",
P_("Vertical Scrollbar Policy"),
P_("When the vertical scrollbar is displayed"),
GTK_TYPE_POLICY_TYPE,
GTK_POLICY_AUTOMATIC,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
properties[PROP_WINDOW_PLACEMENT] =
g_param_spec_enum ("window-placement",
P_("Window Placement"),
P_("Where the contents are located with respect to the scrollbars."),
GTK_TYPE_CORNER_TYPE,
GTK_CORNER_TOP_LEFT,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
properties[PROP_HAS_FRAME] =
g_param_spec_boolean ("has-frame",
P_("Has Frame"),
P_("Whether to draw a frame around the contents"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkScrolledWindow:min-content-width:
*
* The minimum content width of @scrolled_window, or -1 if not set.
*/
properties[PROP_MIN_CONTENT_WIDTH] =
g_param_spec_int ("min-content-width",
P_("Minimum Content Width"),
P_("The minimum width that the scrolled window will allocate to its content"),
-1, G_MAXINT, -1,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkScrolledWindow:min-content-height:
*
* The minimum content height of @scrolled_window, or -1 if not set.
*/
properties[PROP_MIN_CONTENT_HEIGHT] =
g_param_spec_int ("min-content-height",
P_("Minimum Content Height"),
P_("The minimum height that the scrolled window will allocate to its content"),
-1, G_MAXINT, -1,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkScrolledWindow:kinetic-scrolling:
*
* Whether kinetic scrolling is enabled or not. Kinetic scrolling
* only applies to devices with source %GDK_SOURCE_TOUCHSCREEN.
*/
properties[PROP_KINETIC_SCROLLING] =
g_param_spec_boolean ("kinetic-scrolling",
P_("Kinetic Scrolling"),
P_("Kinetic scrolling mode."),
TRUE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkScrolledWindow:overlay-scrolling:
*
* Whether overlay scrolling is enabled or not. If it is, the
* scrollbars are only added as traditional widgets when a mouse
* is present. Otherwise, they are overlaid on top of the content,
* as narrow indicators.
*
* Note that overlay scrolling can also be globally disabled, with
* the #GtkSettings:gtk-overlay-scrolling setting.
*/
properties[PROP_OVERLAY_SCROLLING] =
g_param_spec_boolean ("overlay-scrolling",
P_("Overlay Scrolling"),
P_("Overlay scrolling mode"),
TRUE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkScrolledWindow:max-content-width:
*
* The maximum content width of @scrolled_window, or -1 if not set.
*/
properties[PROP_MAX_CONTENT_WIDTH] =
g_param_spec_int ("max-content-width",
P_("Maximum Content Width"),
P_("The maximum width that the scrolled window will allocate to its content"),
-1, G_MAXINT, -1,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkScrolledWindow:max-content-height:
*
* The maximum content height of @scrolled_window, or -1 if not set.
*/
properties[PROP_MAX_CONTENT_HEIGHT] =
g_param_spec_int ("max-content-height",
P_("Maximum Content Height"),
P_("The maximum height that the scrolled window will allocate to its content"),
-1, G_MAXINT, -1,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkScrolledWindow:propagate-natural-width:
*
* Whether the natural width of the child should be calculated and propagated
* through the scrolled window’s requested natural width.
*
* This is useful in cases where an attempt should be made to allocate exactly
* enough space for the natural size of the child.
*/
properties[PROP_PROPAGATE_NATURAL_WIDTH] =
g_param_spec_boolean ("propagate-natural-width",
P_("Propagate Natural Width"),
P_("Propagate Natural Width"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkScrolledWindow:propagate-natural-height:
*
* Whether the natural height of the child should be calculated and propagated
* through the scrolled window’s requested natural height.
*
* This is useful in cases where an attempt should be made to allocate exactly
* enough space for the natural size of the child.
*/
properties[PROP_PROPAGATE_NATURAL_HEIGHT] =
g_param_spec_boolean ("propagate-natural-height",
P_("Propagate Natural Height"),
P_("Propagate Natural Height"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
properties[PROP_CHILD] =
g_param_spec_object ("child",
P_("Child"),
P_("The child widget"),
GTK_TYPE_WIDGET,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (gobject_class, NUM_PROPERTIES, properties);
/**
* GtkScrolledWindow::scroll-child:
* @scrolled_window: a #GtkScrolledWindow
* @scroll: a #GtkScrollType describing how much to scroll
* @horizontal: whether the keybinding scrolls the child
* horizontally or not
*
* The ::scroll-child signal is a
* [keybinding signal][GtkSignalAction]
* which gets emitted when a keybinding that scrolls is pressed.
* The horizontal or vertical adjustment is updated which triggers a
* signal that the scrolled window’s child may listen to and scroll itself.
*/
signals[SCROLL_CHILD] =
g_signal_new (I_("scroll-child"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child),
NULL, NULL,
_gtk_marshal_BOOLEAN__ENUM_BOOLEAN,
G_TYPE_BOOLEAN, 2,
GTK_TYPE_SCROLL_TYPE,
G_TYPE_BOOLEAN);
/**
* GtkScrolledWindow::move-focus-out:
* @scrolled_window: a #GtkScrolledWindow
* @direction_type: either %GTK_DIR_TAB_FORWARD or
* %GTK_DIR_TAB_BACKWARD
*
* The ::move-focus-out signal is a
* [keybinding signal][GtkSignalAction] which gets
* emitted when focus is moved away from the scrolled window by a
* keybinding. The #GtkWidget::move-focus signal is emitted with
* @direction_type on this scrolled window’s toplevel parent in the
* container hierarchy. The default bindings for this signal are
* `Ctrl + Tab` to move forward and `Ctrl + Shift + Tab` to move backward.
*/
signals[MOVE_FOCUS_OUT] =
g_signal_new (I_("move-focus-out"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out),
NULL, NULL,
NULL,
G_TYPE_NONE, 1,
GTK_TYPE_DIRECTION_TYPE);
/**
* GtkScrolledWindow::edge-overshot:
* @scrolled_window: a #GtkScrolledWindow
* @pos: edge side that was hit
*
* The ::edge-overshot signal is emitted whenever user initiated scrolling
* makes the scrolled window firmly surpass (i.e. with some edge resistance)
* the lower or upper limits defined by the adjustment in that orientation.
*
* A similar behavior without edge resistance is provided by the
* #GtkScrolledWindow::edge-reached signal.
*
* Note: The @pos argument is LTR/RTL aware, so callers should be aware too
* if intending to provide behavior on horizontal edges.
*/
signals[EDGE_OVERSHOT] =
g_signal_new (I_("edge-overshot"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST, 0,
NULL, NULL, NULL,
G_TYPE_NONE, 1, GTK_TYPE_POSITION_TYPE);
/**
* GtkScrolledWindow::edge-reached:
* @scrolled_window: a #GtkScrolledWindow
* @pos: edge side that was reached
*
* The ::edge-reached signal is emitted whenever user-initiated scrolling
* makes the scrolled window exactly reach the lower or upper limits
* defined by the adjustment in that orientation.
*
* A similar behavior with edge resistance is provided by the
* #GtkScrolledWindow::edge-overshot signal.
*
* Note: The @pos argument is LTR/RTL aware, so callers should be aware too
* if intending to provide behavior on horizontal edges.
*/
signals[EDGE_REACHED] =
g_signal_new (I_("edge-reached"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST, 0,
NULL, NULL, NULL,
G_TYPE_NONE, 1, GTK_TYPE_POSITION_TYPE);
add_scroll_binding (widget_class, GDK_KEY_Left, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
add_scroll_binding (widget_class, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, TRUE);
add_scroll_binding (widget_class, GDK_KEY_Up, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
add_scroll_binding (widget_class, GDK_KEY_Down, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, FALSE);
add_scroll_binding (widget_class, GDK_KEY_Page_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
add_scroll_binding (widget_class, GDK_KEY_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD, TRUE);
add_scroll_binding (widget_class, GDK_KEY_Page_Up, 0, GTK_SCROLL_PAGE_BACKWARD, FALSE);
add_scroll_binding (widget_class, GDK_KEY_Page_Down, 0, GTK_SCROLL_PAGE_FORWARD, FALSE);
add_scroll_binding (widget_class, GDK_KEY_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
add_scroll_binding (widget_class, GDK_KEY_End, GDK_CONTROL_MASK, GTK_SCROLL_END, TRUE);
add_scroll_binding (widget_class, GDK_KEY_Home, 0, GTK_SCROLL_START, FALSE);
add_scroll_binding (widget_class, GDK_KEY_End, 0, GTK_SCROLL_END, FALSE);
add_tab_bindings (widget_class, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
add_tab_bindings (widget_class, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
gtk_widget_class_set_css_name (widget_class, I_("scrolledwindow"));
gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_GROUP);
}
static gboolean
may_hscroll (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
return priv->hscrollbar_visible || priv->hscrollbar_policy == GTK_POLICY_EXTERNAL;
}
static gboolean
may_vscroll (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
return priv->vscrollbar_visible || priv->vscrollbar_policy == GTK_POLICY_EXTERNAL;
}
static inline gboolean
policy_may_be_visible (GtkPolicyType policy)
{
return policy == GTK_POLICY_ALWAYS || policy == GTK_POLICY_AUTOMATIC;
}
static void
scrolled_window_drag_begin_cb (GtkScrolledWindow *scrolled_window,
double start_x,
double start_y,
GtkGesture *gesture)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GdkEventSequence *sequence;
GtkWidget *event_widget;
priv->in_drag = FALSE;
priv->drag_start_x = priv->unclamped_hadj_value;
priv->drag_start_y = priv->unclamped_vadj_value;
gtk_scrolled_window_cancel_deceleration (scrolled_window);
sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
event_widget = gtk_gesture_get_last_target (gesture, sequence);
if (event_widget == priv->vscrollbar || event_widget == priv->hscrollbar ||
(!may_hscroll (scrolled_window) && !may_vscroll (scrolled_window)))
gtk_gesture_set_sequence_state (gesture, sequence, GTK_EVENT_SEQUENCE_DENIED);
}
static void
gtk_scrolled_window_invalidate_overshoot (GtkScrolledWindow *scrolled_window)
{
GtkAllocation child_allocation;
int overshoot_x, overshoot_y;
if (!_gtk_scrolled_window_get_overshoot (scrolled_window, &overshoot_x, &overshoot_y))
return;
gtk_scrolled_window_relative_allocation (scrolled_window,
&child_allocation);
if (overshoot_x != 0)
gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
if (overshoot_y != 0)
gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
}
static void
scrolled_window_drag_update_cb (GtkScrolledWindow *scrolled_window,
double offset_x,
double offset_y,
GtkGesture *gesture)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkAdjustment *hadjustment;
GtkAdjustment *vadjustment;
double dx, dy;
if (!gtk_drag_check_threshold (GTK_WIDGET (scrolled_window),
0, 0, offset_x, offset_y))
return;
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_CLAIMED);
hadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
if (hadjustment && may_hscroll (scrolled_window))
{
dx = priv->drag_start_x - offset_x;
_gtk_scrolled_window_set_adjustment_value (scrolled_window,
hadjustment, dx);
}
vadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
if (vadjustment && may_vscroll (scrolled_window))
{
dy = priv->drag_start_y - offset_y;
_gtk_scrolled_window_set_adjustment_value (scrolled_window,
vadjustment, dy);
}
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
}
static void
scrolled_window_drag_end_cb (GtkScrolledWindow *scrolled_window,
GdkEventSequence *sequence,
GtkGesture *gesture)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
if (!priv->in_drag || !gtk_gesture_handles_sequence (gesture, sequence))
gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
}
static void
gtk_scrolled_window_decelerate (GtkScrolledWindow *scrolled_window,
double x_velocity,
double y_velocity)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
gboolean overshoot;
overshoot = _gtk_scrolled_window_get_overshoot (scrolled_window, NULL, NULL);
priv->x_velocity = x_velocity;
priv->y_velocity = y_velocity;
/* Zero out vector components for which we don't scroll */
if (!may_hscroll (scrolled_window))
priv->x_velocity = 0;
if (!may_vscroll (scrolled_window))
priv->y_velocity = 0;
if (priv->x_velocity != 0 || priv->y_velocity != 0 || overshoot)
{
gtk_scrolled_window_start_deceleration (scrolled_window);
priv->x_velocity = priv->y_velocity = 0;
}
}
static void
scrolled_window_swipe_cb (GtkScrolledWindow *scrolled_window,
double x_velocity,
double y_velocity)
{
gtk_scrolled_window_decelerate (scrolled_window, -x_velocity, -y_velocity);
}
static void
scrolled_window_long_press_cb (GtkScrolledWindow *scrolled_window,
double x,
double y,
GtkGesture *gesture)
{
GdkEventSequence *sequence;
sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
gtk_gesture_set_sequence_state (gesture, sequence,
GTK_EVENT_SEQUENCE_DENIED);
}
static void
scrolled_window_long_press_cancelled_cb (GtkScrolledWindow *scrolled_window,
GtkGesture *gesture)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GdkEventSequence *sequence;
GdkEvent *event;
GdkEventType event_type;
sequence = gtk_gesture_get_last_updated_sequence (gesture);
event = gtk_gesture_get_last_event (gesture, sequence);
event_type = gdk_event_get_event_type (event);
if (event_type == GDK_TOUCH_BEGIN ||
event_type == GDK_BUTTON_PRESS)
gtk_gesture_set_sequence_state (gesture, sequence,
GTK_EVENT_SEQUENCE_DENIED);
else if (event_type != GDK_TOUCH_END &&
event_type != GDK_BUTTON_RELEASE)
priv->in_drag = TRUE;
}
static void
gtk_scrolled_window_check_attach_pan_gesture (GtkScrolledWindow *sw)
{
GtkPropagationPhase phase = GTK_PHASE_NONE;
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (sw);
if (priv->kinetic_scrolling &&
((may_hscroll (sw) && !may_vscroll (sw)) ||
(!may_hscroll (sw) && may_vscroll (sw))))
{
GtkOrientation orientation;
if (may_hscroll (sw))
orientation = GTK_ORIENTATION_HORIZONTAL;
else
orientation = GTK_ORIENTATION_VERTICAL;
gtk_gesture_pan_set_orientation (GTK_GESTURE_PAN (priv->pan_gesture),
orientation);
phase = GTK_PHASE_CAPTURE;
}
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->pan_gesture), phase);
}
static void
indicator_set_over (Indicator *indicator,
gboolean over)
{
if (indicator->over_timeout_id)
{
g_source_remove (indicator->over_timeout_id);
indicator->over_timeout_id = 0;
}
if (indicator->over == over)
return;
indicator->over = over;
if (indicator->over)
gtk_widget_add_css_class (indicator->scrollbar, "hovering");
else
gtk_widget_remove_css_class (indicator->scrollbar, "hovering");
gtk_widget_queue_resize (indicator->scrollbar);
}
static gboolean
coords_close_to_indicator (GtkScrolledWindow *sw,
Indicator *indicator,
double x,
double y)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (sw);
graphene_rect_t indicator_bounds;
int distance;
if (!gtk_widget_compute_bounds (indicator->scrollbar, GTK_WIDGET (sw), &indicator_bounds))
return FALSE;
if (indicator->over)
distance = INDICATOR_FAR_DISTANCE;
else
distance = INDICATOR_CLOSE_DISTANCE;
graphene_rect_inset (&indicator_bounds, - distance, - distance);
if (indicator == &priv->hindicator)
{
if (y >= indicator_bounds.origin.y &&
y < indicator_bounds.origin.y + indicator_bounds.size.height)
return TRUE;
}
else if (indicator == &priv->vindicator)
{
if (x >= indicator_bounds.origin.x &&
x < indicator_bounds.origin.x + indicator_bounds.size.width)
return TRUE;
}
return FALSE;
}
static gboolean
enable_over_timeout_cb (gpointer user_data)
{
Indicator *indicator = user_data;
indicator_set_over (indicator, TRUE);
return G_SOURCE_REMOVE;
}
static gboolean
check_update_scrollbar_proximity (GtkScrolledWindow *sw,
Indicator *indicator,
GtkWidget *target,
double x,
double y)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (sw);
gboolean indicator_close, on_scrollbar, on_other_scrollbar;
indicator_close = coords_close_to_indicator (sw, indicator, x, y);
on_scrollbar = (target == indicator->scrollbar ||
gtk_widget_is_ancestor (target, indicator->scrollbar));
on_other_scrollbar = (!on_scrollbar &&
(target == priv->hindicator.scrollbar ||
target == priv->vindicator.scrollbar ||
gtk_widget_is_ancestor (target, priv->hindicator.scrollbar) ||
gtk_widget_is_ancestor (target, priv->vindicator.scrollbar)));
if (indicator->over_timeout_id)
{
g_source_remove (indicator->over_timeout_id);
indicator->over_timeout_id = 0;
}
if (on_scrollbar)
indicator_set_over (indicator, TRUE);
else if (indicator_close && !on_other_scrollbar)
{
indicator->over_timeout_id = g_timeout_add (30, enable_over_timeout_cb, indicator);
g_source_set_name_by_id (indicator->over_timeout_id, "[gtk] enable_over_timeout_cb");
}
else
indicator_set_over (indicator, FALSE);
return indicator_close;
}
static double
get_scroll_unit (GtkScrolledWindow *sw,
GtkOrientation orientation)
{
double scroll_unit;
#ifndef GDK_WINDOWING_MACOS
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (sw);
GtkScrollbar *scrollbar;
GtkAdjustment *adj;
double page_size;
if (orientation == GTK_ORIENTATION_HORIZONTAL)
scrollbar = GTK_SCROLLBAR (priv->hscrollbar);
else
scrollbar = GTK_SCROLLBAR (priv->vscrollbar);
if (!scrollbar)
return 0;
adj = gtk_scrollbar_get_adjustment (scrollbar);
page_size = gtk_adjustment_get_page_size (adj);
scroll_unit = pow (page_size, 2.0 / 3.0);
#else
scroll_unit = 1;
#endif
return scroll_unit;
}
static gboolean
captured_scroll_cb (GtkEventControllerScroll *scroll,
double delta_x,
double delta_y,
GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv =
gtk_scrolled_window_get_instance_private (scrolled_window);
gtk_scrolled_window_cancel_deceleration (scrolled_window);
if (priv->smooth_scroll)
{
scrolled_window_scroll (scrolled_window, delta_x, delta_y, scroll);
return GDK_EVENT_STOP;
}
return GDK_EVENT_PROPAGATE;
}
static void
captured_motion (GtkEventController *controller,
double x,
double y,
GtkScrolledWindow *sw)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (sw);
GdkDevice *source_device;
GdkInputSource input_source;
GdkModifierType state;
GdkEvent *event;
GtkWidget *target;
if (!priv->use_indicators)
return;
if (!priv->child)
return;
target = gtk_event_controller_get_target (controller);
state = gtk_event_controller_get_current_event_state (controller);
event = gtk_event_controller_get_current_event (controller);
source_device = gdk_event_get_device (event);
input_source = gdk_device_get_source (source_device);
if (priv->hscrollbar_visible)
indicator_start_fade (&priv->hindicator, 1.0);
if (priv->vscrollbar_visible)
indicator_start_fade (&priv->vindicator, 1.0);
if ((target == priv->child ||
gtk_widget_is_ancestor (target, priv->child)) &&
(state & (GDK_BUTTON1_MASK | GDK_BUTTON2_MASK | GDK_BUTTON3_MASK)) != 0)
{
indicator_set_over (&priv->hindicator, FALSE);
indicator_set_over (&priv->vindicator, FALSE);
}
else if (input_source == GDK_SOURCE_PEN ||
input_source == GDK_SOURCE_TRACKPOINT)
{
indicator_set_over (&priv->hindicator, TRUE);
indicator_set_over (&priv->vindicator, TRUE);
}
else
{
if (!check_update_scrollbar_proximity (sw, &priv->vindicator, target, x, y))
check_update_scrollbar_proximity (sw, &priv->hindicator, target, x, y);
else
indicator_set_over (&priv->hindicator, FALSE);
}
}
static gboolean
start_scroll_deceleration_cb (gpointer user_data)
{
GtkScrolledWindow *scrolled_window = user_data;
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
priv->scroll_events_overshoot_id = 0;
if (!priv->deceleration_id)
{
uninstall_scroll_cursor (scrolled_window);
gtk_scrolled_window_start_deceleration (scrolled_window);
}
return FALSE;
}
static void
scroll_controller_scroll_begin (GtkEventControllerScroll *scroll,
GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
install_scroll_cursor (scrolled_window);
priv->smooth_scroll = TRUE;
}
static void
scrolled_window_scroll (GtkScrolledWindow *scrolled_window,
double delta_x,
double delta_y,
GtkEventControllerScroll *scroll)
{
GtkScrolledWindowPrivate *priv =
gtk_scrolled_window_get_instance_private (scrolled_window);
gboolean shifted;
GdkModifierType state;
state = gtk_event_controller_get_current_event_state (GTK_EVENT_CONTROLLER (scroll));
shifted = (state & GDK_SHIFT_MASK) != 0;
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
if (shifted)
{
double delta;
delta = delta_x;
delta_x = delta_y;
delta_y = delta;
}
if (delta_x != 0.0 &&
may_hscroll (scrolled_window))
{
GtkAdjustment *adj;
double new_value;
double scroll_unit;
adj = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
scroll_unit = get_scroll_unit (scrolled_window, GTK_ORIENTATION_HORIZONTAL);
new_value = priv->unclamped_hadj_value + delta_x * scroll_unit;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, adj,
new_value);
}
if (delta_y != 0.0 &&
may_vscroll (scrolled_window))
{
GtkAdjustment *adj;
double new_value;
double scroll_unit;
adj = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
scroll_unit = get_scroll_unit (scrolled_window, GTK_ORIENTATION_VERTICAL);
new_value = priv->unclamped_vadj_value + delta_y * scroll_unit;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, adj,
new_value);
}
if (priv->scroll_events_overshoot_id)
{
g_source_remove (priv->scroll_events_overshoot_id);
priv->scroll_events_overshoot_id = 0;
}
if (!priv->smooth_scroll &&
_gtk_scrolled_window_get_overshoot (scrolled_window, NULL, NULL))
{
priv->scroll_events_overshoot_id =
g_timeout_add (50, start_scroll_deceleration_cb, scrolled_window);
g_source_set_name_by_id (priv->scroll_events_overshoot_id,
"[gtk] start_scroll_deceleration_cb");
}
}
static gboolean
scroll_controller_scroll (GtkEventControllerScroll *scroll,
double delta_x,
double delta_y,
GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv =
gtk_scrolled_window_get_instance_private (scrolled_window);
if (!priv->smooth_scroll)
scrolled_window_scroll (scrolled_window, delta_x, delta_y, scroll);
return GDK_EVENT_STOP;
}
static void
scroll_controller_scroll_end (GtkEventControllerScroll *scroll,
GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
priv->smooth_scroll = FALSE;
uninstall_scroll_cursor (scrolled_window);
}
static void
scroll_controller_decelerate (GtkEventControllerScroll *scroll,
double initial_vel_x,
double initial_vel_y,
GtkScrolledWindow *scrolled_window)
{
double unit_x, unit_y;
gboolean shifted;
GdkModifierType state;
state = gtk_event_controller_get_current_event_state (GTK_EVENT_CONTROLLER (scroll));
shifted = (state & GDK_SHIFT_MASK) != 0;
unit_x = get_scroll_unit (scrolled_window, GTK_ORIENTATION_HORIZONTAL);
unit_y = get_scroll_unit (scrolled_window, GTK_ORIENTATION_VERTICAL);
if (shifted)
{
gtk_scrolled_window_decelerate (scrolled_window,
initial_vel_y * unit_x,
initial_vel_x * unit_y);
}
else
{
gtk_scrolled_window_decelerate (scrolled_window,
initial_vel_x * unit_x,
initial_vel_y * unit_y);
}
}
static void
gtk_scrolled_window_update_scrollbar_visibility_flags (GtkScrolledWindow *scrolled_window,
GtkWidget *scrollbar)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkAdjustment *adjustment;
if (scrollbar == NULL)
return;
adjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (scrollbar));
if (scrollbar == priv->hscrollbar)
{
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
priv->hscrollbar_visible = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment) >
gtk_adjustment_get_page_size (adjustment));
}
}
else if (scrollbar == priv->vscrollbar)
{
if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
priv->vscrollbar_visible = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment) >
gtk_adjustment_get_page_size (adjustment));
}
}
}
static void
gtk_scrolled_window_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkAllocation child_allocation;
int sb_width;
int sb_height;
/* Get possible scrollbar dimensions */
gtk_widget_measure (priv->vscrollbar, GTK_ORIENTATION_HORIZONTAL, -1,
&sb_width, NULL, NULL, NULL);
gtk_widget_measure (priv->hscrollbar, GTK_ORIENTATION_VERTICAL, -1,
&sb_height, NULL, NULL, NULL);
if (priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
priv->hscrollbar_visible = TRUE;
else if (priv->hscrollbar_policy == GTK_POLICY_NEVER ||
priv->hscrollbar_policy == GTK_POLICY_EXTERNAL)
priv->hscrollbar_visible = FALSE;
if (priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
priv->vscrollbar_visible = TRUE;
else if (priv->vscrollbar_policy == GTK_POLICY_NEVER ||
priv->vscrollbar_policy == GTK_POLICY_EXTERNAL)
priv->vscrollbar_visible = FALSE;
if (priv->child && gtk_widget_get_visible (priv->child))
{
int child_scroll_width;
int child_scroll_height;
gboolean previous_hvis;
gboolean previous_vvis;
guint count = 0;
GtkScrollable *scrollable_child = GTK_SCROLLABLE (priv->child);
GtkScrollablePolicy hscroll_policy = gtk_scrollable_get_hscroll_policy (scrollable_child);
GtkScrollablePolicy vscroll_policy = gtk_scrollable_get_vscroll_policy (scrollable_child);
/* Determine scrollbar visibility first via hfw apis */
if (gtk_widget_get_request_mode (priv->child) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
{
if (hscroll_policy == GTK_SCROLL_MINIMUM)
gtk_widget_measure (priv->child, GTK_ORIENTATION_HORIZONTAL, -1,
&child_scroll_width, NULL, NULL, NULL);
else
gtk_widget_measure (priv->child, GTK_ORIENTATION_HORIZONTAL, -1,
NULL, &child_scroll_width, NULL, NULL);
if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* First try without a vertical scrollbar if the content will fit the height
* given the extra width of the scrollbar */
if (vscroll_policy == GTK_SCROLL_MINIMUM)
gtk_widget_measure (priv->child, GTK_ORIENTATION_VERTICAL,
MAX (width, child_scroll_width),
&child_scroll_height, NULL, NULL, NULL);
else
gtk_widget_measure (priv->child, GTK_ORIENTATION_VERTICAL,
MAX (width, child_scroll_width),
NULL, &child_scroll_height, NULL, NULL);
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* Does the content height fit the allocation height ? */
priv->vscrollbar_visible = child_scroll_height > height;
/* Does the content width fit the allocation with minus a possible scrollbar ? */
priv->hscrollbar_visible = child_scroll_width > width -
(priv->vscrollbar_visible && !priv->use_indicators ? sb_width : 0);
/* Now that we've guessed the hscrollbar, does the content height fit
* the possible new allocation height ?
*/
priv->vscrollbar_visible = child_scroll_height > height -
(priv->hscrollbar_visible && !priv->use_indicators ? sb_height : 0);
/* Now that we've guessed the vscrollbar, does the content width fit
* the possible new allocation width ?
*/
priv->hscrollbar_visible = child_scroll_width > width -
(priv->vscrollbar_visible && !priv->use_indicators ? sb_width : 0);
}
else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->hscrollbar_visible = policy_may_be_visible (priv->hscrollbar_policy);
priv->vscrollbar_visible = child_scroll_height > height -
(priv->hscrollbar_visible && !priv->use_indicators ? sb_height : 0);
}
}
else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->vscrollbar_visible = policy_may_be_visible (priv->vscrollbar_policy);
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
priv->hscrollbar_visible = child_scroll_width > width -
(priv->vscrollbar_visible && !priv->use_indicators ? 0 : sb_width);
else
priv->hscrollbar_visible = policy_may_be_visible (priv->hscrollbar_policy);
}
}
else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT */
{
if (vscroll_policy == GTK_SCROLL_MINIMUM)
gtk_widget_measure (priv->child, GTK_ORIENTATION_VERTICAL, -1,
&child_scroll_height, NULL, NULL, NULL);
else
gtk_widget_measure (priv->child, GTK_ORIENTATION_VERTICAL, -1,
NULL, &child_scroll_height, NULL, NULL);
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* First try without a horizontal scrollbar if the content will fit the width
* given the extra height of the scrollbar */
if (hscroll_policy == GTK_SCROLL_MINIMUM)
gtk_widget_measure (priv->child, GTK_ORIENTATION_HORIZONTAL,
MAX (height, child_scroll_height),
&child_scroll_width, NULL, NULL, NULL);
else
gtk_widget_measure (priv->child, GTK_ORIENTATION_HORIZONTAL,
MAX (height, child_scroll_height),
NULL, &child_scroll_width, NULL, NULL);
if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* Does the content width fit the allocation width ? */
priv->hscrollbar_visible = child_scroll_width > width;
/* Does the content height fit the allocation with minus a possible scrollbar ? */
priv->vscrollbar_visible = child_scroll_height > height -
(priv->hscrollbar_visible && !priv->use_indicators ? sb_height : 0);
/* Now that we've guessed the vscrollbar, does the content width fit
* the possible new allocation width ?
*/
priv->hscrollbar_visible = child_scroll_width > width -
(priv->vscrollbar_visible && !priv->use_indicators ? sb_width : 0);
/* Now that we've guessed the hscrollbar, does the content height fit
* the possible new allocation height ?
*/
priv->vscrollbar_visible = child_scroll_height > height -
(priv->hscrollbar_visible && !priv->use_indicators ? sb_height : 0);
}
else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->vscrollbar_visible = policy_may_be_visible (priv->vscrollbar_policy);
priv->hscrollbar_visible = child_scroll_width > width -
(priv->vscrollbar_visible && !priv->use_indicators ? sb_width : 0);
}
}
else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->hscrollbar_visible = policy_may_be_visible (priv->hscrollbar_policy);
if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
priv->vscrollbar_visible = child_scroll_height > height -
(priv->hscrollbar_visible && !priv->use_indicators ? sb_height : 0);
else
priv->vscrollbar_visible = policy_may_be_visible (priv->vscrollbar_policy);
}
}
/* Now after guessing scrollbar visibility; fall back on the allocation loop which
* observes the adjustments to detect scrollbar visibility and also avoids
* infinite recursion
*/
do
{
previous_hvis = priv->hscrollbar_visible;
previous_vvis = priv->vscrollbar_visible;
gtk_scrolled_window_allocate_child (scrolled_window, width, height);
/* Explicitly force scrollbar visibility checks.
*
* Since we make a guess above, the child might not decide to update the adjustments
* if they logically did not change since the last configuration
*
* These will update priv->hscrollbar_visible and priv->vscrollbar_visible.
*/
gtk_scrolled_window_update_scrollbar_visibility_flags (scrolled_window,
priv->hscrollbar);
gtk_scrolled_window_update_scrollbar_visibility_flags (scrolled_window,
priv->vscrollbar);
/* If, after the first iteration, the hscrollbar and the
* vscrollbar flip visibility... or if one of the scrollbars flip
* on each iteration indefinitely/infinitely, then we just need both
* at this size.
*/
if ((count &&
previous_hvis != priv->hscrollbar_visible &&
previous_vvis != priv->vscrollbar_visible) || count > 3)
{
priv->hscrollbar_visible = TRUE;
priv->vscrollbar_visible = TRUE;
gtk_scrolled_window_allocate_child (scrolled_window, width, height);
break;
}
count++;
}
while (previous_hvis != priv->hscrollbar_visible ||
previous_vvis != priv->vscrollbar_visible);
}
else
{
priv->hscrollbar_visible = priv->hscrollbar_policy == GTK_POLICY_ALWAYS;
priv->vscrollbar_visible = priv->vscrollbar_policy == GTK_POLICY_ALWAYS;
}
gtk_widget_set_child_visible (priv->hscrollbar, priv->hscrollbar_visible);
if (priv->hscrollbar_visible)
{
gtk_scrolled_window_allocate_scrollbar (scrolled_window,
priv->hscrollbar,
&child_allocation);
gtk_widget_size_allocate (priv->hscrollbar, &child_allocation, -1);
}
gtk_widget_set_child_visible (priv->vscrollbar, priv->vscrollbar_visible);
if (priv->vscrollbar_visible)
{
gtk_scrolled_window_allocate_scrollbar (scrolled_window,
priv->vscrollbar,
&child_allocation);
gtk_widget_size_allocate (priv->vscrollbar, &child_allocation, -1);
}
gtk_scrolled_window_check_attach_pan_gesture (scrolled_window);
}
static void
gtk_scrolled_window_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum_size,
int *natural_size,
int *minimum_baseline,
int *natural_baseline)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
int minimum_req = 0, natural_req = 0;
GtkBorder sborder = { 0 };
if (priv->child)
gtk_scrollable_get_border (GTK_SCROLLABLE (priv->child), &sborder);
/*
* First collect the child requisition
*/
if (priv->child && gtk_widget_get_visible (priv->child))
{
int min_child_size, nat_child_size;
gtk_widget_measure (priv->child, orientation, -1,
&min_child_size, &nat_child_size,
NULL, NULL);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
if (priv->propagate_natural_width)
natural_req += nat_child_size;
if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
{
minimum_req += min_child_size;
}
else
{
int min = priv->min_content_width >= 0 ? priv->min_content_width : 0;
int max = priv->max_content_width >= 0 ? priv->max_content_width : G_MAXINT;
minimum_req = CLAMP (minimum_req, min, max);
natural_req = CLAMP (natural_req, min, max);
}
}
else /* GTK_ORIENTATION_VERTICAL */
{
if (priv->propagate_natural_height)
natural_req += nat_child_size;
if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
{
minimum_req += min_child_size;
}
else
{
int min = priv->min_content_height >= 0 ? priv->min_content_height : 0;
int max = priv->max_content_height >= 0 ? priv->max_content_height : G_MAXINT;
minimum_req = CLAMP (minimum_req, min, max);
natural_req = CLAMP (natural_req, min, max);
}
}
}
/* Ensure we make requests with natural size >= minimum size */
natural_req = MAX (minimum_req, natural_req);
/*
* Now add to the requisition any additional space for surrounding scrollbars
* and the special scrollable border.
*/
if (policy_may_be_visible (priv->hscrollbar_policy))
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
int min_scrollbar_width, nat_scrollbar_width;
gtk_widget_measure (priv->hscrollbar, GTK_ORIENTATION_HORIZONTAL, -1,
&min_scrollbar_width, &nat_scrollbar_width,
NULL, NULL);
minimum_req = MAX (minimum_req, min_scrollbar_width + sborder.left + sborder.right);
natural_req = MAX (natural_req, nat_scrollbar_width + sborder.left + sborder.right);
}
else if (!priv->use_indicators && priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
{
int min_scrollbar_height, nat_scrollbar_height;
gtk_widget_measure (priv->hscrollbar, GTK_ORIENTATION_VERTICAL, -1,
&min_scrollbar_height, &nat_scrollbar_height,
NULL, NULL);
minimum_req += min_scrollbar_height;
natural_req += nat_scrollbar_height;
}
}
if (policy_may_be_visible (priv->vscrollbar_policy))
{
if (orientation == GTK_ORIENTATION_VERTICAL)
{
int min_scrollbar_height, nat_scrollbar_height;
gtk_widget_measure (priv->vscrollbar, GTK_ORIENTATION_VERTICAL, -1,
&min_scrollbar_height, &nat_scrollbar_height,
NULL, NULL);
minimum_req = MAX (minimum_req, min_scrollbar_height + sborder.top + sborder.bottom);
natural_req = MAX (natural_req, nat_scrollbar_height + sborder.top + sborder.bottom);
}
else if (!priv->use_indicators && priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
{
int min_scrollbar_width, nat_scrollbar_width;
gtk_widget_measure (priv->vscrollbar, GTK_ORIENTATION_HORIZONTAL, -1,
&min_scrollbar_width, &nat_scrollbar_width,
NULL, NULL);
minimum_req += min_scrollbar_width;
natural_req += nat_scrollbar_width;
}
}
*minimum_size = minimum_req;
*natural_size = natural_req;
}
static void
gtk_scrolled_window_snapshot_scrollbars_junction (GtkScrolledWindow *scrolled_window,
GtkSnapshot *snapshot)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkWidget *widget = GTK_WIDGET (scrolled_window);
GtkAllocation hscr_allocation, vscr_allocation;
GtkStyleContext *context;
GdkRectangle junction_rect;
gtk_widget_get_allocation (GTK_WIDGET (priv->hscrollbar), &hscr_allocation);
gtk_widget_get_allocation (GTK_WIDGET (priv->vscrollbar), &vscr_allocation);
junction_rect.x = vscr_allocation.x;
junction_rect.y = hscr_allocation.y;
junction_rect.width = vscr_allocation.width;
junction_rect.height = hscr_allocation.height;
context = gtk_widget_get_style_context (widget);
gtk_style_context_save_to_node (context, priv->junction_node);
gtk_snapshot_render_background (snapshot, context,
junction_rect.x, junction_rect.y,
junction_rect.width, junction_rect.height);
gtk_snapshot_render_frame (snapshot, context,
junction_rect.x, junction_rect.y,
junction_rect.width, junction_rect.height);
gtk_style_context_restore (context);
}
static void
gtk_scrolled_window_snapshot_overshoot (GtkScrolledWindow *scrolled_window,
GtkSnapshot *snapshot)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkWidget *widget = GTK_WIDGET (scrolled_window);
int overshoot_x, overshoot_y;
GtkStyleContext *context;
GdkRectangle rect;
if (!_gtk_scrolled_window_get_overshoot (scrolled_window, &overshoot_x, &overshoot_y))
return;
context = gtk_widget_get_style_context (widget);
gtk_scrolled_window_inner_allocation (scrolled_window, &rect);
overshoot_x = CLAMP (overshoot_x, - MAX_OVERSHOOT_DISTANCE, MAX_OVERSHOOT_DISTANCE);
overshoot_y = CLAMP (overshoot_y, - MAX_OVERSHOOT_DISTANCE, MAX_OVERSHOOT_DISTANCE);
if (overshoot_x > 0)
{
gtk_style_context_save_to_node (context, priv->overshoot_node[GTK_POS_RIGHT]);
gtk_snapshot_render_background (snapshot, context, rect.x + rect.width - overshoot_x, rect.y, overshoot_x, rect.height);
gtk_snapshot_render_frame (snapshot, context, rect.x + rect.width - overshoot_x, rect.y, overshoot_x, rect.height);
gtk_style_context_restore (context);
}
else if (overshoot_x < 0)
{
gtk_style_context_save_to_node (context, priv->overshoot_node[GTK_POS_LEFT]);
gtk_snapshot_render_background (snapshot, context, rect.x, rect.y, -overshoot_x, rect.height);
gtk_snapshot_render_frame (snapshot, context, rect.x, rect.y, -overshoot_x, rect.height);
gtk_style_context_restore (context);
}
if (overshoot_y > 0)
{
gtk_style_context_save_to_node (context, priv->overshoot_node[GTK_POS_BOTTOM]);
gtk_snapshot_render_background (snapshot, context, rect.x, rect.y + rect.height - overshoot_y, rect.width, overshoot_y);
gtk_snapshot_render_frame (snapshot, context, rect.x, rect.y + rect.height - overshoot_y, rect.width, overshoot_y);
gtk_style_context_restore (context);
}
else if (overshoot_y < 0)
{
gtk_style_context_save_to_node (context, priv->overshoot_node[GTK_POS_TOP]);
gtk_snapshot_render_background (snapshot, context, rect.x, rect.y, rect.width, -overshoot_y);
gtk_snapshot_render_frame (snapshot, context, rect.x, rect.y, rect.width, -overshoot_y);
gtk_style_context_restore (context);
}
}
static void
gtk_scrolled_window_snapshot_undershoot (GtkScrolledWindow *scrolled_window,
GtkSnapshot *snapshot)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkWidget *widget = GTK_WIDGET (scrolled_window);
GtkStyleContext *context;
GdkRectangle rect;
GtkAdjustment *adj;
context = gtk_widget_get_style_context (widget);
gtk_scrolled_window_inner_allocation (scrolled_window, &rect);
adj = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
if (gtk_adjustment_get_value (adj) < gtk_adjustment_get_upper (adj) - gtk_adjustment_get_page_size (adj))
{
gtk_style_context_save_to_node (context, priv->undershoot_node[GTK_POS_RIGHT]);
gtk_snapshot_render_background (snapshot, context, rect.x + rect.width - UNDERSHOOT_SIZE, rect.y, UNDERSHOOT_SIZE, rect.height);
gtk_snapshot_render_frame (snapshot, context, rect.x + rect.width - UNDERSHOOT_SIZE, rect.y, UNDERSHOOT_SIZE, rect.height);
gtk_style_context_restore (context);
}
if (gtk_adjustment_get_value (adj) > gtk_adjustment_get_lower (adj))
{
gtk_style_context_save_to_node (context, priv->undershoot_node[GTK_POS_LEFT]);
gtk_snapshot_render_background (snapshot, context, rect.x, rect.y, UNDERSHOOT_SIZE, rect.height);
gtk_snapshot_render_frame (snapshot, context, rect.x, rect.y, UNDERSHOOT_SIZE, rect.height);
gtk_style_context_restore (context);
}
adj = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
if (gtk_adjustment_get_value (adj) < gtk_adjustment_get_upper (adj) - gtk_adjustment_get_page_size (adj))
{
gtk_style_context_save_to_node (context, priv->undershoot_node[GTK_POS_BOTTOM]);
gtk_snapshot_render_background (snapshot, context, rect.x, rect.y + rect.height - UNDERSHOOT_SIZE, rect.width, UNDERSHOOT_SIZE);
gtk_snapshot_render_frame (snapshot, context, rect.x, rect.y + rect.height - UNDERSHOOT_SIZE, rect.width, UNDERSHOOT_SIZE);
gtk_style_context_restore (context);
}
if (gtk_adjustment_get_value (adj) > gtk_adjustment_get_lower (adj))
{
gtk_style_context_save_to_node (context, priv->undershoot_node[GTK_POS_TOP]);
gtk_snapshot_render_background (snapshot, context, rect.x, rect.y, rect.width, UNDERSHOOT_SIZE);
gtk_snapshot_render_frame (snapshot, context, rect.x, rect.y, rect.width, UNDERSHOOT_SIZE);
gtk_style_context_restore (context);
}
}
static void
gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
{
GtkWidget *widget = GTK_WIDGET (scrolled_window);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkEventController *controller;
GtkCssNode *widget_node;
GQuark classes[4] = {
g_quark_from_static_string ("left"),
g_quark_from_static_string ("right"),
g_quark_from_static_string ("top"),
g_quark_from_static_string ("bottom"),
};
int i;
gtk_widget_set_focusable (widget, TRUE);
/* Instantiated by gtk_scrolled_window_set_[hv]adjustment
* which are both construct properties
*/
priv->hscrollbar = NULL;
priv->vscrollbar = NULL;
priv->hscrollbar_policy = GTK_POLICY_AUTOMATIC;
priv->vscrollbar_policy = GTK_POLICY_AUTOMATIC;
priv->hscrollbar_visible = FALSE;
priv->vscrollbar_visible = FALSE;
priv->focus_out = FALSE;
priv->auto_added_viewport = FALSE;
priv->window_placement = GTK_CORNER_TOP_LEFT;
priv->min_content_width = -1;
priv->min_content_height = -1;
priv->max_content_width = -1;
priv->max_content_height = -1;
priv->overlay_scrolling = TRUE;
priv->drag_gesture = gtk_gesture_drag_new ();
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->drag_gesture), TRUE);
g_signal_connect_swapped (priv->drag_gesture, "drag-begin",
G_CALLBACK (scrolled_window_drag_begin_cb),
scrolled_window);
g_signal_connect_swapped (priv->drag_gesture, "drag-update",
G_CALLBACK (scrolled_window_drag_update_cb),
scrolled_window);
g_signal_connect_swapped (priv->drag_gesture, "end",
G_CALLBACK (scrolled_window_drag_end_cb),
scrolled_window);
gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (priv->drag_gesture));
priv->pan_gesture = gtk_gesture_pan_new (GTK_ORIENTATION_VERTICAL);
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->pan_gesture), TRUE);
gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (priv->pan_gesture));
gtk_gesture_group (priv->pan_gesture, priv->drag_gesture);
priv->swipe_gesture = gtk_gesture_swipe_new ();
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->swipe_gesture), TRUE);
g_signal_connect_swapped (priv->swipe_gesture, "swipe",
G_CALLBACK (scrolled_window_swipe_cb),
scrolled_window);
gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (priv->swipe_gesture));
gtk_gesture_group (priv->swipe_gesture, priv->drag_gesture);
priv->long_press_gesture = gtk_gesture_long_press_new ();
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->long_press_gesture), TRUE);
g_signal_connect_swapped (priv->long_press_gesture, "pressed",
G_CALLBACK (scrolled_window_long_press_cb),
scrolled_window);
g_signal_connect_swapped (priv->long_press_gesture, "cancelled",
G_CALLBACK (scrolled_window_long_press_cancelled_cb),
scrolled_window);
gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (priv->long_press_gesture));
gtk_gesture_group (priv->long_press_gesture, priv->drag_gesture);
gtk_scrolled_window_set_kinetic_scrolling (scrolled_window, TRUE);
controller = gtk_event_controller_motion_new ();
gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_CAPTURE);
g_signal_connect (controller, "motion",
G_CALLBACK (captured_motion), scrolled_window);
gtk_widget_add_controller (widget, controller);
widget_node = gtk_widget_get_css_node (widget);
for (i = 0; i < 4; i++)
{
priv->overshoot_node[i] = gtk_css_node_new ();
gtk_css_node_set_name (priv->overshoot_node[i], g_quark_from_static_string ("overshoot"));
gtk_css_node_add_class (priv->overshoot_node[i], classes[i]);
gtk_css_node_set_parent (priv->overshoot_node[i], widget_node);
gtk_css_node_set_state (priv->overshoot_node[i], gtk_css_node_get_state (widget_node));
g_object_unref (priv->overshoot_node[i]);
priv->undershoot_node[i] = gtk_css_node_new ();
gtk_css_node_set_name (priv->undershoot_node[i], g_quark_from_static_string ("undershoot"));
gtk_css_node_add_class (priv->undershoot_node[i], classes[i]);
gtk_css_node_set_parent (priv->undershoot_node[i], widget_node);
gtk_css_node_set_state (priv->undershoot_node[i], gtk_css_node_get_state (widget_node));
g_object_unref (priv->undershoot_node[i]);
}
gtk_scrolled_window_update_use_indicators (scrolled_window);
priv->junction_node = gtk_css_node_new ();
gtk_css_node_set_name (priv->junction_node, g_quark_from_static_string ("junction"));
gtk_css_node_set_parent (priv->junction_node, widget_node);
gtk_css_node_set_state (priv->junction_node, gtk_css_node_get_state (widget_node));
g_object_unref (priv->junction_node);
controller = gtk_event_controller_scroll_new (GTK_EVENT_CONTROLLER_SCROLL_BOTH_AXES |
GTK_EVENT_CONTROLLER_SCROLL_KINETIC);
g_signal_connect (controller, "scroll-begin",
G_CALLBACK (scroll_controller_scroll_begin), scrolled_window);
g_signal_connect (controller, "scroll",
G_CALLBACK (scroll_controller_scroll), scrolled_window);
g_signal_connect (controller, "scroll-end",
G_CALLBACK (scroll_controller_scroll_end), scrolled_window);
gtk_widget_add_controller (widget, controller);
controller = gtk_event_controller_scroll_new (GTK_EVENT_CONTROLLER_SCROLL_BOTH_AXES |
GTK_EVENT_CONTROLLER_SCROLL_KINETIC);
gtk_event_controller_set_propagation_phase (controller, GTK_PHASE_CAPTURE);
g_signal_connect (controller, "scroll",
G_CALLBACK (captured_scroll_cb), scrolled_window);
g_signal_connect (controller, "decelerate",
G_CALLBACK (scroll_controller_decelerate), scrolled_window);
gtk_widget_add_controller (widget, controller);
controller = gtk_event_controller_motion_new ();
g_signal_connect (controller, "leave",
G_CALLBACK (motion_controller_leave), scrolled_window);
gtk_widget_add_controller (widget, controller);
}
/**
* gtk_scrolled_window_new:
*
* Creates a new scrolled window.
*
* Returns: a new scrolled window
*/
GtkWidget *
gtk_scrolled_window_new (void)
{
return g_object_new (GTK_TYPE_SCROLLED_WINDOW, NULL);
}
/**
* gtk_scrolled_window_set_hadjustment:
* @scrolled_window: a #GtkScrolledWindow
* @hadjustment: (nullable): the #GtkAdjustment to use, or %NULL to create a new one
*
* Sets the #GtkAdjustment for the horizontal scrollbar.
*/
void
gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
GtkAdjustment *hadjustment)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (hadjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment));
else
hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
if (!priv->hscrollbar)
{
priv->hscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_HORIZONTAL, hadjustment);
gtk_widget_insert_before (priv->hscrollbar, GTK_WIDGET (scrolled_window), priv->vscrollbar);
update_scrollbar_positions (scrolled_window);
}
else
{
GtkAdjustment *old_adjustment;
old_adjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
if (old_adjustment == hadjustment)
return;
g_signal_handlers_disconnect_by_func (old_adjustment,
gtk_scrolled_window_adjustment_changed,
scrolled_window);
g_signal_handlers_disconnect_by_func (old_adjustment,
gtk_scrolled_window_adjustment_value_changed,
scrolled_window);
gtk_adjustment_enable_animation (old_adjustment, NULL, 0);
gtk_scrollbar_set_adjustment (GTK_SCROLLBAR (priv->hscrollbar), hadjustment);
}
hadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
g_signal_connect (hadjustment,
"changed",
G_CALLBACK (gtk_scrolled_window_adjustment_changed),
scrolled_window);
g_signal_connect (hadjustment,
"value-changed",
G_CALLBACK (gtk_scrolled_window_adjustment_value_changed),
scrolled_window);
gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
gtk_scrolled_window_adjustment_value_changed (hadjustment, scrolled_window);
if (priv->child)
gtk_scrollable_set_hadjustment (GTK_SCROLLABLE (priv->child), hadjustment);
if (gtk_widget_should_animate (GTK_WIDGET (scrolled_window)))
gtk_adjustment_enable_animation (hadjustment, gtk_widget_get_frame_clock (GTK_WIDGET (scrolled_window)), ANIMATION_DURATION);
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties[PROP_HADJUSTMENT]);
}
/**
* gtk_scrolled_window_set_vadjustment:
* @scrolled_window: a #GtkScrolledWindow
* @vadjustment: (nullable): the #GtkAdjustment to use, or %NULL to create a new one
*
* Sets the #GtkAdjustment for the vertical scrollbar.
*/
void
gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
GtkAdjustment *vadjustment)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (vadjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
else
vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL);
if (!priv->vscrollbar)
{
priv->vscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, vadjustment);
gtk_widget_insert_after (priv->vscrollbar, GTK_WIDGET (scrolled_window), priv->hscrollbar);
update_scrollbar_positions (scrolled_window);
}
else
{
GtkAdjustment *old_adjustment;
old_adjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
if (old_adjustment == vadjustment)
return;
g_signal_handlers_disconnect_by_func (old_adjustment,
gtk_scrolled_window_adjustment_changed,
scrolled_window);
g_signal_handlers_disconnect_by_func (old_adjustment,
gtk_scrolled_window_adjustment_value_changed,
scrolled_window);
gtk_adjustment_enable_animation (old_adjustment, NULL, 0);
gtk_scrollbar_set_adjustment (GTK_SCROLLBAR (priv->vscrollbar), vadjustment);
}
vadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
g_signal_connect (vadjustment,
"changed",
G_CALLBACK (gtk_scrolled_window_adjustment_changed),
scrolled_window);
g_signal_connect (vadjustment,
"value-changed",
G_CALLBACK (gtk_scrolled_window_adjustment_value_changed),
scrolled_window);
gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);
gtk_scrolled_window_adjustment_value_changed (vadjustment, scrolled_window);
if (priv->child)
gtk_scrollable_set_vadjustment (GTK_SCROLLABLE (priv->child), vadjustment);
if (gtk_widget_should_animate (GTK_WIDGET (scrolled_window)))
gtk_adjustment_enable_animation (vadjustment, gtk_widget_get_frame_clock (GTK_WIDGET (scrolled_window)), ANIMATION_DURATION);
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties[PROP_VADJUSTMENT]);
}
/**
* gtk_scrolled_window_get_hadjustment:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the horizontal scrollbar’s adjustment, used to connect the
* horizontal scrollbar to the child widget’s horizontal scroll
* functionality.
*
* Returns: (transfer none): the horizontal #GtkAdjustment
*/
GtkAdjustment*
gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
}
/**
* gtk_scrolled_window_get_vadjustment:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the vertical scrollbar’s adjustment, used to connect the
* vertical scrollbar to the child widget’s vertical scroll functionality.
*
* Returns: (transfer none): the vertical #GtkAdjustment
*/
GtkAdjustment*
gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
}
/**
* gtk_scrolled_window_get_hscrollbar:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the horizontal scrollbar of @scrolled_window.
*
* Returns: (transfer none): the horizontal scrollbar of the scrolled window.
*/
GtkWidget*
gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return priv->hscrollbar;
}
/**
* gtk_scrolled_window_get_vscrollbar:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the vertical scrollbar of @scrolled_window.
*
* Returns: (transfer none): the vertical scrollbar of the scrolled window.
*/
GtkWidget*
gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return priv->vscrollbar;
}
/**
* gtk_scrolled_window_set_policy:
* @scrolled_window: a #GtkScrolledWindow
* @hscrollbar_policy: policy for horizontal bar
* @vscrollbar_policy: policy for vertical bar
*
* Sets the scrollbar policy for the horizontal and vertical scrollbars.
*
* The policy determines when the scrollbar should appear; it is a value
* from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
* scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
* never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only
* if needed (that is, if the slider part of the bar would be smaller
* than the trough — the display is larger than the page size).
*/
void
gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
GtkPolicyType hscrollbar_policy,
GtkPolicyType vscrollbar_policy)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GObject *object = G_OBJECT (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if ((priv->hscrollbar_policy != hscrollbar_policy) ||
(priv->vscrollbar_policy != vscrollbar_policy))
{
priv->hscrollbar_policy = hscrollbar_policy;
priv->vscrollbar_policy = vscrollbar_policy;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify_by_pspec (object, properties[PROP_HSCROLLBAR_POLICY]);
g_object_notify_by_pspec (object, properties[PROP_VSCROLLBAR_POLICY]);
}
}
/**
* gtk_scrolled_window_get_policy:
* @scrolled_window: a #GtkScrolledWindow
* @hscrollbar_policy: (out) (optional): location to store the policy
* for the horizontal scrollbar, or %NULL
* @vscrollbar_policy: (out) (optional): location to store the policy
* for the vertical scrollbar, or %NULL
*
* Retrieves the current policy values for the horizontal and vertical
* scrollbars. See gtk_scrolled_window_set_policy().
*/
void
gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,
GtkPolicyType *hscrollbar_policy,
GtkPolicyType *vscrollbar_policy)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (hscrollbar_policy)
*hscrollbar_policy = priv->hscrollbar_policy;
if (vscrollbar_policy)
*vscrollbar_policy = priv->vscrollbar_policy;
}
/**
* gtk_scrolled_window_set_placement:
* @scrolled_window: a #GtkScrolledWindow
* @window_placement: position of the child window
*
* Sets the placement of the contents with respect to the scrollbars
* for the scrolled window.
*
* The default is %GTK_CORNER_TOP_LEFT, meaning the child is
* in the top left, with the scrollbars underneath and to the right.
* Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
* %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
*
* See also gtk_scrolled_window_get_placement() and
* gtk_scrolled_window_unset_placement().
*/
void
gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
GtkCornerType window_placement)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (priv->window_placement != window_placement)
{
priv->window_placement = window_placement;
update_scrollbar_positions (scrolled_window);
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties[PROP_WINDOW_PLACEMENT]);
}
}
/**
* gtk_scrolled_window_get_placement:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the placement of the contents with respect to the scrollbars
* for the scrolled window. See gtk_scrolled_window_set_placement().
*
* Returns: the current placement value.
*
* See also gtk_scrolled_window_set_placement() and
* gtk_scrolled_window_unset_placement().
**/
GtkCornerType
gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
return priv->window_placement;
}
/**
* gtk_scrolled_window_unset_placement:
* @scrolled_window: a #GtkScrolledWindow
*
* Unsets the placement of the contents with respect to the scrollbars
* for the scrolled window. If no window placement is set for a scrolled
* window, it defaults to %GTK_CORNER_TOP_LEFT.
*
* See also gtk_scrolled_window_set_placement() and
* gtk_scrolled_window_get_placement().
**/
void
gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
gtk_scrolled_window_set_placement (scrolled_window, GTK_CORNER_TOP_LEFT);
}
/**
* gtk_scrolled_window_set_has_frame:
* @scrolled_window: a #GtkScrolledWindow
* @has_frame: whether to draw a frame around scrolled window contents
*
* Changes the frame drawn around the contents of @scrolled_window.
**/
void
gtk_scrolled_window_set_has_frame (GtkScrolledWindow *scrolled_window,
gboolean has_frame)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (priv->has_frame == !!has_frame)
return;
priv->has_frame = has_frame;
if (has_frame)
gtk_widget_add_css_class (GTK_WIDGET (scrolled_window), "frame");
else
gtk_widget_remove_css_class (GTK_WIDGET (scrolled_window), "frame");
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties[PROP_HAS_FRAME]);
}
/**
* gtk_scrolled_window_get_has_frame:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets whether the scrolled window draws a frame.
* See gtk_scrolled_window_set_has_frame().
*
* Returns: %TRUE if the @scrolled_window has a frame
**/
gboolean
gtk_scrolled_window_get_has_frame (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), FALSE);
return priv->has_frame;
}
/**
* gtk_scrolled_window_set_kinetic_scrolling:
* @scrolled_window: a #GtkScrolledWindow
* @kinetic_scrolling: %TRUE to enable kinetic scrolling
*
* Turns kinetic scrolling on or off.
* Kinetic scrolling only applies to devices with source
* %GDK_SOURCE_TOUCHSCREEN.
**/
void
gtk_scrolled_window_set_kinetic_scrolling (GtkScrolledWindow *scrolled_window,
gboolean kinetic_scrolling)
{
GtkPropagationPhase phase = GTK_PHASE_NONE;
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (priv->kinetic_scrolling == kinetic_scrolling)
return;
priv->kinetic_scrolling = kinetic_scrolling;
gtk_scrolled_window_check_attach_pan_gesture (scrolled_window);
if (priv->kinetic_scrolling)
phase = GTK_PHASE_CAPTURE;
else
gtk_scrolled_window_cancel_deceleration (scrolled_window);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->drag_gesture), phase);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->swipe_gesture), phase);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->long_press_gesture), phase);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->pan_gesture), phase);
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties[PROP_KINETIC_SCROLLING]);
}
/**
* gtk_scrolled_window_get_kinetic_scrolling:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the specified kinetic scrolling behavior.
*
* Returns: the scrolling behavior flags.
*/
gboolean
gtk_scrolled_window_get_kinetic_scrolling (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), FALSE);
return priv->kinetic_scrolling;
}
static void
gtk_scrolled_window_dispose (GObject *object)
{
GtkScrolledWindow *self = GTK_SCROLLED_WINDOW (object);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (self);
g_clear_pointer (&priv->child, gtk_widget_unparent);
remove_indicator (self, &priv->hindicator);
remove_indicator (self, &priv->vindicator);
if (priv->hscrollbar)
{
GtkAdjustment *hadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
g_signal_handlers_disconnect_by_data (hadjustment, self);
g_signal_handlers_disconnect_by_data (hadjustment, &priv->hindicator);
gtk_widget_unparent (priv->hscrollbar);
priv->hscrollbar = NULL;
}
if (priv->vscrollbar)
{
GtkAdjustment *vadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
g_signal_handlers_disconnect_by_data (vadjustment, self);
g_signal_handlers_disconnect_by_data (vadjustment, &priv->vindicator);
gtk_widget_unparent (priv->vscrollbar);
priv->vscrollbar = NULL;
}
if (priv->deceleration_id)
{
gtk_widget_remove_tick_callback (GTK_WIDGET (self), priv->deceleration_id);
priv->deceleration_id = 0;
}
g_clear_pointer (&priv->hscrolling, gtk_kinetic_scrolling_free);
g_clear_pointer (&priv->vscrolling, gtk_kinetic_scrolling_free);
if (priv->scroll_events_overshoot_id)
{
g_source_remove (priv->scroll_events_overshoot_id);
priv->scroll_events_overshoot_id = 0;
}
G_OBJECT_CLASS (gtk_scrolled_window_parent_class)->dispose (object);
}
static void
gtk_scrolled_window_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
switch (prop_id)
{
case PROP_HADJUSTMENT:
gtk_scrolled_window_set_hadjustment (scrolled_window,
g_value_get_object (value));
break;
case PROP_VADJUSTMENT:
gtk_scrolled_window_set_vadjustment (scrolled_window,
g_value_get_object (value));
break;
case PROP_HSCROLLBAR_POLICY:
gtk_scrolled_window_set_policy (scrolled_window,
g_value_get_enum (value),
priv->vscrollbar_policy);
break;
case PROP_VSCROLLBAR_POLICY:
gtk_scrolled_window_set_policy (scrolled_window,
priv->hscrollbar_policy,
g_value_get_enum (value));
break;
case PROP_WINDOW_PLACEMENT:
gtk_scrolled_window_set_placement (scrolled_window,
g_value_get_enum (value));
break;
case PROP_HAS_FRAME:
gtk_scrolled_window_set_has_frame (scrolled_window,
g_value_get_boolean (value));
break;
case PROP_MIN_CONTENT_WIDTH:
gtk_scrolled_window_set_min_content_width (scrolled_window,
g_value_get_int (value));
break;
case PROP_MIN_CONTENT_HEIGHT:
gtk_scrolled_window_set_min_content_height (scrolled_window,
g_value_get_int (value));
break;
case PROP_KINETIC_SCROLLING:
gtk_scrolled_window_set_kinetic_scrolling (scrolled_window,
g_value_get_boolean (value));
break;
case PROP_OVERLAY_SCROLLING:
gtk_scrolled_window_set_overlay_scrolling (scrolled_window,
g_value_get_boolean (value));
break;
case PROP_MAX_CONTENT_WIDTH:
gtk_scrolled_window_set_max_content_width (scrolled_window,
g_value_get_int (value));
break;
case PROP_MAX_CONTENT_HEIGHT:
gtk_scrolled_window_set_max_content_height (scrolled_window,
g_value_get_int (value));
break;
case PROP_PROPAGATE_NATURAL_WIDTH:
gtk_scrolled_window_set_propagate_natural_width (scrolled_window,
g_value_get_boolean (value));
break;
case PROP_PROPAGATE_NATURAL_HEIGHT:
gtk_scrolled_window_set_propagate_natural_height (scrolled_window,
g_value_get_boolean (value));
break;
case PROP_CHILD:
gtk_scrolled_window_set_child (scrolled_window, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scrolled_window_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
switch (prop_id)
{
case PROP_HADJUSTMENT:
g_value_set_object (value,
G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window)));
break;
case PROP_VADJUSTMENT:
g_value_set_object (value,
G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window)));
break;
case PROP_WINDOW_PLACEMENT:
g_value_set_enum (value, priv->window_placement);
break;
case PROP_HAS_FRAME:
g_value_set_boolean (value, priv->has_frame);
break;
case PROP_HSCROLLBAR_POLICY:
g_value_set_enum (value, priv->hscrollbar_policy);
break;
case PROP_VSCROLLBAR_POLICY:
g_value_set_enum (value, priv->vscrollbar_policy);
break;
case PROP_MIN_CONTENT_WIDTH:
g_value_set_int (value, priv->min_content_width);
break;
case PROP_MIN_CONTENT_HEIGHT:
g_value_set_int (value, priv->min_content_height);
break;
case PROP_KINETIC_SCROLLING:
g_value_set_boolean (value, priv->kinetic_scrolling);
break;
case PROP_OVERLAY_SCROLLING:
g_value_set_boolean (value, priv->overlay_scrolling);
break;
case PROP_MAX_CONTENT_WIDTH:
g_value_set_int (value, priv->max_content_width);
break;
case PROP_MAX_CONTENT_HEIGHT:
g_value_set_int (value, priv->max_content_height);
break;
case PROP_PROPAGATE_NATURAL_WIDTH:
g_value_set_boolean (value, priv->propagate_natural_width);
break;
case PROP_PROPAGATE_NATURAL_HEIGHT:
g_value_set_boolean (value, priv->propagate_natural_height);
break;
case PROP_CHILD:
g_value_set_object (value, gtk_scrolled_window_get_child (scrolled_window));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scrolled_window_inner_allocation (GtkScrolledWindow *scrolled_window,
GtkAllocation *rect)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkBorder border = { 0 };
gtk_scrolled_window_relative_allocation (scrolled_window, rect);
rect->x = 0;
rect->y = 0;
if (priv->child && gtk_scrollable_get_border (GTK_SCROLLABLE (priv->child), &border))
{
rect->x += border.left;
rect->y += border.top;
rect->width -= border.left + border.right;
rect->height -= border.top + border.bottom;
}
}
static void
gtk_scrolled_window_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
if (priv->hscrollbar_visible &&
priv->vscrollbar_visible &&
!priv->use_indicators)
gtk_scrolled_window_snapshot_scrollbars_junction (scrolled_window, snapshot);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->snapshot (widget, snapshot);
gtk_scrolled_window_snapshot_undershoot (scrolled_window, snapshot);
gtk_scrolled_window_snapshot_overshoot (scrolled_window, snapshot);
}
static gboolean
gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
GtkScrollType scroll,
gboolean horizontal)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkAdjustment *adjustment = NULL;
switch (scroll)
{
case GTK_SCROLL_STEP_UP:
scroll = GTK_SCROLL_STEP_BACKWARD;
horizontal = FALSE;
break;
case GTK_SCROLL_STEP_DOWN:
scroll = GTK_SCROLL_STEP_FORWARD;
horizontal = FALSE;
break;
case GTK_SCROLL_STEP_LEFT:
scroll = GTK_SCROLL_STEP_BACKWARD;
horizontal = TRUE;
break;
case GTK_SCROLL_STEP_RIGHT:
scroll = GTK_SCROLL_STEP_FORWARD;
horizontal = TRUE;
break;
case GTK_SCROLL_PAGE_UP:
scroll = GTK_SCROLL_PAGE_BACKWARD;
horizontal = FALSE;
break;
case GTK_SCROLL_PAGE_DOWN:
scroll = GTK_SCROLL_PAGE_FORWARD;
horizontal = FALSE;
break;
case GTK_SCROLL_PAGE_LEFT:
scroll = GTK_SCROLL_STEP_BACKWARD;
horizontal = TRUE;
break;
case GTK_SCROLL_PAGE_RIGHT:
scroll = GTK_SCROLL_STEP_FORWARD;
horizontal = TRUE;
break;
case GTK_SCROLL_STEP_BACKWARD:
case GTK_SCROLL_STEP_FORWARD:
case GTK_SCROLL_PAGE_BACKWARD:
case GTK_SCROLL_PAGE_FORWARD:
case GTK_SCROLL_START:
case GTK_SCROLL_END:
break;
case GTK_SCROLL_NONE:
case GTK_SCROLL_JUMP:
default:
g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
return FALSE;
}
if (horizontal)
{
if (may_hscroll (scrolled_window))
adjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
else
return FALSE;
}
else
{
if (may_vscroll (scrolled_window))
adjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
else
return FALSE;
}
if (adjustment)
{
double value = gtk_adjustment_get_value (adjustment);
switch (scroll)
{
case GTK_SCROLL_STEP_FORWARD:
value += gtk_adjustment_get_step_increment (adjustment);
break;
case GTK_SCROLL_STEP_BACKWARD:
value -= gtk_adjustment_get_step_increment (adjustment);
break;
case GTK_SCROLL_PAGE_FORWARD:
value += gtk_adjustment_get_page_increment (adjustment);
break;
case GTK_SCROLL_PAGE_BACKWARD:
value -= gtk_adjustment_get_page_increment (adjustment);
break;
case GTK_SCROLL_START:
value = gtk_adjustment_get_lower (adjustment);
break;
case GTK_SCROLL_END:
value = gtk_adjustment_get_upper (adjustment);
break;
case GTK_SCROLL_STEP_UP:
case GTK_SCROLL_STEP_DOWN:
case GTK_SCROLL_STEP_LEFT:
case GTK_SCROLL_STEP_RIGHT:
case GTK_SCROLL_PAGE_UP:
case GTK_SCROLL_PAGE_DOWN:
case GTK_SCROLL_PAGE_LEFT:
case GTK_SCROLL_PAGE_RIGHT:
case GTK_SCROLL_NONE:
case GTK_SCROLL_JUMP:
default:
g_assert_not_reached ();
break;
}
gtk_adjustment_animate_to_value (adjustment, value);
return TRUE;
}
return FALSE;
}
static void
gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window,
GtkDirectionType direction_type)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkWidget *toplevel;
/* Focus out of the scrolled window entirely. We do this by setting
* a flag, then propagating the focus motion to the notebook.
*/
toplevel = GTK_WIDGET (gtk_widget_get_root (GTK_WIDGET (scrolled_window)));
if (!GTK_IS_ROOT (toplevel))
return;
g_object_ref (scrolled_window);
priv->focus_out = TRUE;
g_signal_emit_by_name (toplevel, "move-focus", direction_type);
priv->focus_out = FALSE;
g_object_unref (scrolled_window);
}
static void
gtk_scrolled_window_relative_allocation (GtkScrolledWindow *scrolled_window,
GtkAllocation *allocation)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
int sb_width;
int sb_height;
int width, height;
g_return_if_fail (scrolled_window != NULL);
g_return_if_fail (allocation != NULL);
/* Get possible scrollbar dimensions */
gtk_widget_measure (priv->vscrollbar, GTK_ORIENTATION_HORIZONTAL, -1,
&sb_width, NULL, NULL, NULL);
gtk_widget_measure (priv->hscrollbar, GTK_ORIENTATION_VERTICAL, -1,
&sb_height, NULL, NULL, NULL);
width = gtk_widget_get_width (GTK_WIDGET (scrolled_window));
height = gtk_widget_get_height (GTK_WIDGET (scrolled_window));
allocation->x = 0;
allocation->y = 0;
allocation->width = width;
allocation->height = height;
/* Subtract some things from our available allocation size */
if (priv->vscrollbar_visible && !priv->use_indicators)
{
gboolean is_rtl;
is_rtl = _gtk_widget_get_direction (GTK_WIDGET (scrolled_window)) == GTK_TEXT_DIR_RTL;
if ((!is_rtl &&
(priv->window_placement == GTK_CORNER_TOP_RIGHT ||
priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(is_rtl &&
(priv->window_placement == GTK_CORNER_TOP_LEFT ||
priv->window_placement == GTK_CORNER_BOTTOM_LEFT)))
allocation->x += sb_width;
allocation->width = MAX (1, width - sb_width);
}
if (priv->hscrollbar_visible && !priv->use_indicators)
{
if (priv->window_placement == GTK_CORNER_BOTTOM_LEFT ||
priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)
allocation->y += (sb_height);
allocation->height = MAX (1, height - sb_height);
}
}
static gboolean
_gtk_scrolled_window_get_overshoot (GtkScrolledWindow *scrolled_window,
int *overshoot_x,
int *overshoot_y)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkAdjustment *vadjustment, *hadjustment;
double lower, upper, x, y;
/* Vertical overshoot */
vadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
lower = gtk_adjustment_get_lower (vadjustment);
upper = gtk_adjustment_get_upper (vadjustment) -
gtk_adjustment_get_page_size (vadjustment);
if (priv->unclamped_vadj_value < lower)
y = priv->unclamped_vadj_value - lower;
else if (priv->unclamped_vadj_value > upper)
y = priv->unclamped_vadj_value - upper;
else
y = 0;
/* Horizontal overshoot */
hadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
lower = gtk_adjustment_get_lower (hadjustment);
upper = gtk_adjustment_get_upper (hadjustment) -
gtk_adjustment_get_page_size (hadjustment);
if (priv->unclamped_hadj_value < lower)
x = priv->unclamped_hadj_value - lower;
else if (priv->unclamped_hadj_value > upper)
x = priv->unclamped_hadj_value - upper;
else
x = 0;
if (overshoot_x)
*overshoot_x = x;
if (overshoot_y)
*overshoot_y = y;
return (x != 0 || y != 0);
}
static void
gtk_scrolled_window_allocate_child (GtkScrolledWindow *swindow,
int width,
int height)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (swindow);
GtkWidget *widget = GTK_WIDGET (swindow);
GtkAllocation child_allocation;
int sb_width;
int sb_height;
child_allocation = (GtkAllocation) {0, 0, width, height};
/* Get possible scrollbar dimensions */
gtk_widget_measure (priv->vscrollbar, GTK_ORIENTATION_HORIZONTAL, -1,
&sb_width, NULL, NULL, NULL);
gtk_widget_measure (priv->hscrollbar, GTK_ORIENTATION_VERTICAL, -1,
&sb_height, NULL, NULL, NULL);
/* Subtract some things from our available allocation size */
if (priv->vscrollbar_visible && !priv->use_indicators)
{
gboolean is_rtl;
is_rtl = _gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
if ((!is_rtl &&
(priv->window_placement == GTK_CORNER_TOP_RIGHT ||
priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(is_rtl &&
(priv->window_placement == GTK_CORNER_TOP_LEFT ||
priv->window_placement == GTK_CORNER_BOTTOM_LEFT)))
child_allocation.x += sb_width;
child_allocation.width = MAX (1, child_allocation.width - sb_width);
}
if (priv->hscrollbar_visible && !priv->use_indicators)
{
if (priv->window_placement == GTK_CORNER_BOTTOM_LEFT ||
priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)
child_allocation.y += (sb_height);
child_allocation.height = MAX (1, child_allocation.height - sb_height);
}
gtk_widget_size_allocate (priv->child, &child_allocation, -1);
}
static void
gtk_scrolled_window_allocate_scrollbar (GtkScrolledWindow *scrolled_window,
GtkWidget *scrollbar,
GtkAllocation *allocation)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkAllocation child_allocation, content_allocation;
GtkWidget *widget = GTK_WIDGET (scrolled_window);
int sb_height, sb_width;
gtk_scrolled_window_inner_allocation (scrolled_window, &content_allocation);
gtk_widget_measure (priv->vscrollbar, GTK_ORIENTATION_HORIZONTAL, -1,
&sb_width, NULL, NULL, NULL);
gtk_widget_measure (priv->hscrollbar, GTK_ORIENTATION_VERTICAL, -1,
&sb_height, NULL, NULL, NULL);
if (scrollbar == priv->hscrollbar)
{
child_allocation.x = content_allocation.x;
if (priv->window_placement == GTK_CORNER_TOP_LEFT ||
priv->window_placement == GTK_CORNER_TOP_RIGHT)
{
if (priv->use_indicators)
child_allocation.y = content_allocation.y + content_allocation.height - sb_height;
else
child_allocation.y = content_allocation.y + content_allocation.height;
}
else
{
if (priv->use_indicators)
child_allocation.y = content_allocation.y;
else
child_allocation.y = content_allocation.y - sb_height;
}
child_allocation.width = content_allocation.width;
child_allocation.height = sb_height;
}
else
{
g_assert (scrollbar == priv->vscrollbar);
if ((_gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL &&
(priv->window_placement == GTK_CORNER_TOP_RIGHT ||
priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(_gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
(priv->window_placement == GTK_CORNER_TOP_LEFT ||
priv->window_placement == GTK_CORNER_BOTTOM_LEFT)))
{
if (priv->use_indicators)
child_allocation.x = content_allocation.x + content_allocation.width - sb_width;
else
child_allocation.x = content_allocation.x + content_allocation.width;
}
else
{
if (priv->use_indicators)
child_allocation.x = content_allocation.x;
else
child_allocation.x = content_allocation.x - sb_width;
}
child_allocation.y = content_allocation.y;
child_allocation.width = sb_width;
child_allocation.height = content_allocation.height;
}
*allocation = child_allocation;
}
static void
install_scroll_cursor (GtkScrolledWindow *scrolled_window)
{
gtk_widget_set_cursor_from_name (GTK_WIDGET (scrolled_window), "all-scroll");
}
static void
uninstall_scroll_cursor (GtkScrolledWindow *scrolled_window)
{
gtk_widget_set_cursor (GTK_WIDGET (scrolled_window), NULL);
}
static void
_gtk_scrolled_window_set_adjustment_value (GtkScrolledWindow *scrolled_window,
GtkAdjustment *adjustment,
double value)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
double lower, upper, *prev_value;
GtkPositionType edge_pos;
gboolean vertical;
lower = gtk_adjustment_get_lower (adjustment) - MAX_OVERSHOOT_DISTANCE;
upper = gtk_adjustment_get_upper (adjustment) -
gtk_adjustment_get_page_size (adjustment) + MAX_OVERSHOOT_DISTANCE;
if (adjustment == gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar)))
vertical = FALSE;
else if (adjustment == gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar)))
vertical = TRUE;
else
return;
if (vertical)
prev_value = &priv->unclamped_vadj_value;
else
prev_value = &priv->unclamped_hadj_value;
value = CLAMP (value, lower, upper);
if (*prev_value == value)
return;
*prev_value = value;
gtk_adjustment_set_value (adjustment, value);
if (value == lower)
edge_pos = vertical ? GTK_POS_TOP : GTK_POS_LEFT;
else if (value == upper)
edge_pos = vertical ? GTK_POS_BOTTOM : GTK_POS_RIGHT;
else
return;
/* Invert horizontal edge position on RTL */
if (!vertical &&
_gtk_widget_get_direction (GTK_WIDGET (scrolled_window)) == GTK_TEXT_DIR_RTL)
edge_pos = (edge_pos == GTK_POS_LEFT) ? GTK_POS_RIGHT : GTK_POS_LEFT;
g_signal_emit (scrolled_window, signals[EDGE_OVERSHOT], 0, edge_pos);
}
static gboolean
scrolled_window_deceleration_cb (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer user_data)
{
GtkScrolledWindow *scrolled_window = user_data;
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkAdjustment *hadjustment, *vadjustment;
gint64 current_time;
double position, elapsed;
current_time = gdk_frame_clock_get_frame_time (frame_clock);
elapsed = (current_time - priv->last_deceleration_time) / (double)G_TIME_SPAN_SECOND;
priv->last_deceleration_time = current_time;
hadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
vadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
if (priv->hscrolling &&
gtk_kinetic_scrolling_tick (priv->hscrolling, elapsed, &position, NULL))
{
priv->unclamped_hadj_value = position;
gtk_adjustment_set_value (hadjustment, position);
}
else if (priv->hscrolling)
g_clear_pointer (&priv->hscrolling, gtk_kinetic_scrolling_free);
if (priv->vscrolling &&
gtk_kinetic_scrolling_tick (priv->vscrolling, elapsed, &position, NULL))
{
priv->unclamped_vadj_value = position;
gtk_adjustment_set_value (vadjustment, position);
}
else if (priv->vscrolling)
g_clear_pointer (&priv->vscrolling, gtk_kinetic_scrolling_free);
if (!priv->hscrolling && !priv->vscrolling)
{
gtk_scrolled_window_cancel_deceleration (scrolled_window);
return G_SOURCE_REMOVE;
}
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
return G_SOURCE_CONTINUE;
}
static void
gtk_scrolled_window_cancel_deceleration (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
if (priv->deceleration_id)
{
gtk_widget_remove_tick_callback (GTK_WIDGET (scrolled_window),
priv->deceleration_id);
priv->deceleration_id = 0;
}
}
static void
kinetic_scroll_stop_notify (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
priv->deceleration_id = 0;
}
static void
gtk_scrolled_window_accumulate_velocity (GtkKineticScrolling **scrolling, double elapsed, double *velocity)
{
if (!*scrolling)
return;
double last_velocity;
gtk_kinetic_scrolling_tick (*scrolling, elapsed, NULL, &last_velocity);
if (((*velocity >= 0) == (last_velocity >= 0)) &&
(fabs (*velocity) >= fabs (last_velocity) * VELOCITY_ACCUMULATION_FLOOR))
{
double min_velocity = last_velocity * VELOCITY_ACCUMULATION_FLOOR;
double max_velocity = last_velocity * VELOCITY_ACCUMULATION_CEIL;
double accumulation_multiplier = (*velocity - min_velocity) / (max_velocity - min_velocity);
*velocity += last_velocity * fmin (accumulation_multiplier, VELOCITY_ACCUMULATION_MAX);
}
g_clear_pointer (scrolling, gtk_kinetic_scrolling_free);
}
static void
gtk_scrolled_window_start_deceleration (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GdkFrameClock *frame_clock;
gint64 current_time;
double elapsed;
g_return_if_fail (priv->deceleration_id == 0);
frame_clock = gtk_widget_get_frame_clock (GTK_WIDGET (scrolled_window));
current_time = gdk_frame_clock_get_frame_time (frame_clock);
elapsed = (current_time - priv->last_deceleration_time) / (double)G_TIME_SPAN_SECOND;
priv->last_deceleration_time = current_time;
if (may_hscroll (scrolled_window))
{
double lower,upper;
GtkAdjustment *hadjustment;
gtk_scrolled_window_accumulate_velocity (&priv->hscrolling, elapsed, &priv->x_velocity);
hadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
lower = gtk_adjustment_get_lower (hadjustment);
upper = gtk_adjustment_get_upper (hadjustment);
upper -= gtk_adjustment_get_page_size (hadjustment);
priv->hscrolling =
gtk_kinetic_scrolling_new (lower,
upper,
MAX_OVERSHOOT_DISTANCE,
DECELERATION_FRICTION,
OVERSHOOT_FRICTION,
priv->unclamped_hadj_value,
priv->x_velocity);
}
else
g_clear_pointer (&priv->hscrolling, gtk_kinetic_scrolling_free);
if (may_vscroll (scrolled_window))
{
double lower,upper;
GtkAdjustment *vadjustment;
gtk_scrolled_window_accumulate_velocity (&priv->vscrolling, elapsed, &priv->y_velocity);
vadjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
lower = gtk_adjustment_get_lower(vadjustment);
upper = gtk_adjustment_get_upper(vadjustment);
upper -= gtk_adjustment_get_page_size(vadjustment);
priv->vscrolling =
gtk_kinetic_scrolling_new (lower,
upper,
MAX_OVERSHOOT_DISTANCE,
DECELERATION_FRICTION,
OVERSHOOT_FRICTION,
priv->unclamped_vadj_value,
priv->y_velocity);
}
else
g_clear_pointer (&priv->vscrolling, gtk_kinetic_scrolling_free);
priv->deceleration_id = gtk_widget_add_tick_callback (GTK_WIDGET (scrolled_window),
scrolled_window_deceleration_cb, scrolled_window,
(GDestroyNotify) kinetic_scroll_stop_notify);
}
static gboolean
gtk_scrolled_window_focus (GtkWidget *widget,
GtkDirectionType direction)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
gboolean had_focus_child;
had_focus_child = gtk_widget_get_focus_child (widget) != NULL;
if (priv->focus_out)
{
priv->focus_out = FALSE; /* Clear this to catch the wrap-around case */
return FALSE;
}
if (gtk_widget_is_focus (widget))
return FALSE;
/* We only put the scrolled window itself in the focus chain if it
* isn't possible to focus any children.
*/
if (priv->child)
{
if (gtk_widget_child_focus (priv->child, direction))
return TRUE;
}
if (!had_focus_child && gtk_widget_get_can_focus (widget))
{
gtk_widget_grab_focus (widget);
return TRUE;
}
else
return FALSE;
}
static void
gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment,
gpointer data)
{
GtkScrolledWindow *scrolled_window = data;
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
if (adjustment == gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar)))
{
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;
visible = priv->hscrollbar_visible;
gtk_scrolled_window_update_scrollbar_visibility_flags (scrolled_window, priv->hscrollbar);
if (priv->hscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
else if (adjustment == gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar)))
{
if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;
visible = priv->vscrollbar_visible;
gtk_scrolled_window_update_scrollbar_visibility_flags (scrolled_window, priv->vscrollbar);
if (priv->vscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
}
static void
maybe_emit_edge_reached (GtkScrolledWindow *scrolled_window,
GtkAdjustment *adjustment)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
double value, lower, upper, page_size;
GtkPositionType edge_pos;
gboolean vertical;
if (adjustment == gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar)))
vertical = FALSE;
else if (adjustment == gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar)))
vertical = TRUE;
else
return;
value = gtk_adjustment_get_value (adjustment);
lower = gtk_adjustment_get_lower (adjustment);
upper = gtk_adjustment_get_upper (adjustment);
page_size = gtk_adjustment_get_page_size (adjustment);
if (value == lower)
edge_pos = vertical ? GTK_POS_TOP: GTK_POS_LEFT;
else if (value == upper - page_size)
edge_pos = vertical ? GTK_POS_BOTTOM : GTK_POS_RIGHT;
else
return;
if (!vertical &&
_gtk_widget_get_direction (GTK_WIDGET (scrolled_window)) == GTK_TEXT_DIR_RTL)
edge_pos = (edge_pos == GTK_POS_LEFT) ? GTK_POS_RIGHT : GTK_POS_LEFT;
g_signal_emit (scrolled_window, signals[EDGE_REACHED], 0, edge_pos);
}
static void
gtk_scrolled_window_adjustment_value_changed (GtkAdjustment *adjustment,
gpointer user_data)
{
GtkScrolledWindow *scrolled_window = user_data;
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
maybe_emit_edge_reached (scrolled_window, adjustment);
/* Allow overshooting for kinetic scrolling operations */
if (priv->deceleration_id)
return;
/* Ensure GtkAdjustment and unclamped values are in sync */
if (adjustment == gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar)))
priv->unclamped_hadj_value = gtk_adjustment_get_value (adjustment);
else if (adjustment == gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar)))
priv->unclamped_vadj_value = gtk_adjustment_get_value (adjustment);
}
static gboolean
gtk_widget_should_animate (GtkWidget *widget)
{
if (!gtk_widget_get_mapped (widget))
return FALSE;
return gtk_settings_get_enable_animations (gtk_widget_get_settings (widget));
}
static void
gtk_scrolled_window_update_animating (GtkScrolledWindow *sw)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (sw);
GtkAdjustment *adjustment;
GdkFrameClock *clock = NULL;
guint duration = 0;
if (gtk_widget_should_animate (GTK_WIDGET (sw)))
{
clock = gtk_widget_get_frame_clock (GTK_WIDGET (sw)),
duration = ANIMATION_DURATION;
}
adjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
gtk_adjustment_enable_animation (adjustment, clock, duration);
adjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
gtk_adjustment_enable_animation (adjustment, clock, duration);
}
static void
gtk_scrolled_window_map (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->map (widget);
gtk_scrolled_window_update_animating (scrolled_window);
gtk_scrolled_window_update_use_indicators (scrolled_window);
}
static void
indicator_reset (Indicator *indicator)
{
if (indicator->conceil_timer)
{
g_source_remove (indicator->conceil_timer);
indicator->conceil_timer = 0;
}
if (indicator->over_timeout_id)
{
g_source_remove (indicator->over_timeout_id);
indicator->over_timeout_id = 0;
}
if (indicator->scrollbar && indicator->tick_id)
{
gtk_widget_remove_tick_callback (indicator->scrollbar,
indicator->tick_id);
indicator->tick_id = 0;
}
indicator->over = FALSE;
gtk_progress_tracker_finish (&indicator->tracker);
indicator->current_pos = indicator->source_pos = indicator->target_pos = 0;
indicator->last_scroll_time = 0;
}
static void
gtk_scrolled_window_unmap (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->unmap (widget);
gtk_scrolled_window_update_animating (scrolled_window);
indicator_reset (&priv->hindicator);
indicator_reset (&priv->vindicator);
}
static void
indicator_set_fade (Indicator *indicator,
double pos)
{
gboolean visible, changed;
changed = indicator->current_pos != pos;
indicator->current_pos = pos;
visible = indicator->current_pos != 0.0 || indicator->target_pos != 0.0;
if (visible && indicator->conceil_timer == 0)
{
indicator->conceil_timer = g_timeout_add (INDICATOR_FADE_OUT_TIME, maybe_hide_indicator, indicator);
g_source_set_name_by_id (indicator->conceil_timer, "[gtk] maybe_hide_indicator");
}
if (!visible && indicator->conceil_timer != 0)
{
g_source_remove (indicator->conceil_timer);
indicator->conceil_timer = 0;
}
if (changed)
{
gtk_widget_set_opacity (indicator->scrollbar, indicator->current_pos);
}
}
static gboolean
indicator_fade_cb (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer user_data)
{
Indicator *indicator = user_data;
double t;
gtk_progress_tracker_advance_frame (&indicator->tracker,
gdk_frame_clock_get_frame_time (frame_clock));
t = gtk_progress_tracker_get_ease_out_cubic (&indicator->tracker, FALSE);
indicator_set_fade (indicator,
indicator->source_pos + (t * (indicator->target_pos - indicator->source_pos)));
if (gtk_progress_tracker_get_state (&indicator->tracker) == GTK_PROGRESS_STATE_AFTER)
{
indicator->tick_id = 0;
return FALSE;
}
return TRUE;
}
static void
indicator_start_fade (Indicator *indicator,
double target)
{
if (indicator->target_pos == target)
return;
indicator->target_pos = target;
if (target != 0.0)
indicator->last_scroll_time = g_get_monotonic_time ();
if (gtk_widget_should_animate (indicator->scrollbar))
{
indicator->source_pos = indicator->current_pos;
gtk_progress_tracker_start (&indicator->tracker, INDICATOR_FADE_OUT_DURATION * 1000, 0, 1.0);
if (indicator->tick_id == 0)
indicator->tick_id = gtk_widget_add_tick_callback (indicator->scrollbar, indicator_fade_cb, indicator, NULL);
}
else
indicator_set_fade (indicator, target);
}
static gboolean
maybe_hide_indicator (gpointer data)
{
Indicator *indicator = data;
if (g_get_monotonic_time () - indicator->last_scroll_time >= INDICATOR_FADE_OUT_DELAY * 1000 &&
!indicator->over)
indicator_start_fade (indicator, 0.0);
return G_SOURCE_CONTINUE;
}
static void
indicator_value_changed (GtkAdjustment *adjustment,
Indicator *indicator)
{
indicator->last_scroll_time = g_get_monotonic_time ();
indicator_start_fade (indicator, 1.0);
}
static void
setup_indicator (GtkScrolledWindow *scrolled_window,
Indicator *indicator,
GtkWidget *scrollbar)
{
GtkAdjustment *adjustment;
if (scrollbar == NULL)
return;
adjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (scrollbar));
indicator->scrollbar = scrollbar;
gtk_widget_add_css_class (scrollbar, "overlay-indicator");
g_signal_connect (adjustment, "value-changed",
G_CALLBACK (indicator_value_changed), indicator);
gtk_widget_set_opacity (scrollbar, 0.0);
indicator->current_pos = 0.0;
}
static void
remove_indicator (GtkScrolledWindow *scrolled_window,
Indicator *indicator)
{
GtkWidget *scrollbar;
GtkAdjustment *adjustment;
if (indicator->scrollbar == NULL)
return;
scrollbar = indicator->scrollbar;
indicator->scrollbar = NULL;
gtk_widget_remove_css_class (scrollbar, "overlay-indicator");
adjustment = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (scrollbar));
g_signal_handlers_disconnect_by_data (adjustment, indicator);
if (indicator->conceil_timer)
{
g_source_remove (indicator->conceil_timer);
indicator->conceil_timer = 0;
}
if (indicator->over_timeout_id)
{
g_source_remove (indicator->over_timeout_id);
indicator->over_timeout_id = 0;
}
if (indicator->tick_id)
{
gtk_widget_remove_tick_callback (scrollbar, indicator->tick_id);
indicator->tick_id = 0;
}
gtk_widget_set_opacity (scrollbar, 1.0);
indicator->current_pos = 1.0;
}
static void
gtk_scrolled_window_sync_use_indicators (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
if (priv->use_indicators)
{
setup_indicator (scrolled_window, &priv->hindicator, priv->hscrollbar);
setup_indicator (scrolled_window, &priv->vindicator, priv->vscrollbar);
}
else
{
remove_indicator (scrolled_window, &priv->hindicator);
remove_indicator (scrolled_window, &priv->vindicator);
}
}
static void
gtk_scrolled_window_update_use_indicators (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
gboolean use_indicators;
GtkSettings *settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
gboolean overlay_scrolling;
g_object_get (settings, "gtk-overlay-scrolling", &overlay_scrolling, NULL);
use_indicators = overlay_scrolling && priv->overlay_scrolling;
if (priv->use_indicators != use_indicators)
{
priv->use_indicators = use_indicators;
if (gtk_widget_get_realized (GTK_WIDGET (scrolled_window)))
gtk_scrolled_window_sync_use_indicators (scrolled_window);
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
static void
gtk_scrolled_window_realize (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
priv->hindicator.scrollbar = priv->hscrollbar;
priv->vindicator.scrollbar = priv->vscrollbar;
gtk_scrolled_window_sync_use_indicators (scrolled_window);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->realize (widget);
}
/**
* gtk_scrolled_window_get_min_content_width:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the minimum content width of @scrolled_window, or -1 if not set.
*
* Returns: the minimum content width
*/
int
gtk_scrolled_window_get_min_content_width (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
return priv->min_content_width;
}
/**
* gtk_scrolled_window_set_min_content_width:
* @scrolled_window: a #GtkScrolledWindow
* @width: the minimal content width
*
* Sets the minimum width that @scrolled_window should keep visible.
* Note that this can and (usually will) be smaller than the minimum
* size of the content.
*
* It is a programming error to set the minimum content width to a
* value greater than #GtkScrolledWindow:max-content-width.
*/
void
gtk_scrolled_window_set_min_content_width (GtkScrolledWindow *scrolled_window,
int width)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (width == -1 || priv->max_content_width == -1 || width <= priv->max_content_width);
if (priv->min_content_width != width)
{
priv->min_content_width = width;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties[PROP_MIN_CONTENT_WIDTH]);
}
}
/**
* gtk_scrolled_window_get_min_content_height:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the minimal content height of @scrolled_window, or -1 if not set.
*
* Returns: the minimal content height
*/
int
gtk_scrolled_window_get_min_content_height (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
return priv->min_content_height;
}
/**
* gtk_scrolled_window_set_min_content_height:
* @scrolled_window: a #GtkScrolledWindow
* @height: the minimal content height
*
* Sets the minimum height that @scrolled_window should keep visible.
* Note that this can and (usually will) be smaller than the minimum
* size of the content.
*
* It is a programming error to set the minimum content height to a
* value greater than #GtkScrolledWindow:max-content-height.
*/
void
gtk_scrolled_window_set_min_content_height (GtkScrolledWindow *scrolled_window,
int height)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (height == -1 || priv->max_content_height == -1 || height <= priv->max_content_height);
if (priv->min_content_height != height)
{
priv->min_content_height = height;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties[PROP_MIN_CONTENT_HEIGHT]);
}
}
/**
* gtk_scrolled_window_set_overlay_scrolling:
* @scrolled_window: a #GtkScrolledWindow
* @overlay_scrolling: whether to enable overlay scrolling
*
* Enables or disables overlay scrolling for this scrolled window.
*/
void
gtk_scrolled_window_set_overlay_scrolling (GtkScrolledWindow *scrolled_window,
gboolean overlay_scrolling)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (priv->overlay_scrolling != overlay_scrolling)
{
priv->overlay_scrolling = overlay_scrolling;
gtk_scrolled_window_update_use_indicators (scrolled_window);
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties[PROP_OVERLAY_SCROLLING]);
}
}
/**
* gtk_scrolled_window_get_overlay_scrolling:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns whether overlay scrolling is enabled for this scrolled window.
*
* Returns: %TRUE if overlay scrolling is enabled
*/
gboolean
gtk_scrolled_window_get_overlay_scrolling (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), TRUE);
return priv->overlay_scrolling;
}
/**
* gtk_scrolled_window_set_max_content_width:
* @scrolled_window: a #GtkScrolledWindow
* @width: the maximum content width
*
* Sets the maximum width that @scrolled_window should keep visible. The
* @scrolled_window will grow up to this width before it starts scrolling
* the content.
*
* It is a programming error to set the maximum content width to a value
* smaller than #GtkScrolledWindow:min-content-width.
*/
void
gtk_scrolled_window_set_max_content_width (GtkScrolledWindow *scrolled_window,
int width)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (width == -1 || priv->min_content_width == -1 || width >= priv->min_content_width);
if (width != priv->max_content_width)
{
priv->max_content_width = width;
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties [PROP_MAX_CONTENT_WIDTH]);
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
/**
* gtk_scrolled_window_get_max_content_width:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the maximum content width set.
*
* Returns: the maximum content width, or -1
*/
int
gtk_scrolled_window_get_max_content_width (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), -1);
return priv->max_content_width;
}
/**
* gtk_scrolled_window_set_max_content_height:
* @scrolled_window: a #GtkScrolledWindow
* @height: the maximum content height
*
* Sets the maximum height that @scrolled_window should keep visible. The
* @scrolled_window will grow up to this height before it starts scrolling
* the content.
*
* It is a programming error to set the maximum content height to a value
* smaller than #GtkScrolledWindow:min-content-height.
*/
void
gtk_scrolled_window_set_max_content_height (GtkScrolledWindow *scrolled_window,
int height)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (height == -1 || priv->min_content_height == -1 || height >= priv->min_content_height);
if (height != priv->max_content_height)
{
priv->max_content_height = height;
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties [PROP_MAX_CONTENT_HEIGHT]);
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
/**
* gtk_scrolled_window_get_max_content_height:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the maximum content height set.
*
* Returns: the maximum content height, or -1
*/
int
gtk_scrolled_window_get_max_content_height (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), -1);
return priv->max_content_height;
}
/**
* gtk_scrolled_window_set_propagate_natural_width:
* @scrolled_window: a #GtkScrolledWindow
* @propagate: whether to propagate natural width
*
* Sets whether the natural width of the child should be calculated and propagated
* through the scrolled window’s requested natural width.
*/
void
gtk_scrolled_window_set_propagate_natural_width (GtkScrolledWindow *scrolled_window,
gboolean propagate)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
propagate = !!propagate;
if (priv->propagate_natural_width != propagate)
{
priv->propagate_natural_width = propagate;
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties [PROP_PROPAGATE_NATURAL_WIDTH]);
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
/**
* gtk_scrolled_window_get_propagate_natural_width:
* @scrolled_window: a #GtkScrolledWindow
*
* Reports whether the natural width of the child will be calculated and propagated
* through the scrolled window’s requested natural width.
*
* Returns: whether natural width propagation is enabled.
*/
gboolean
gtk_scrolled_window_get_propagate_natural_width (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), -1);
return priv->propagate_natural_width;
}
/**
* gtk_scrolled_window_set_propagate_natural_height:
* @scrolled_window: a #GtkScrolledWindow
* @propagate: whether to propagate natural height
*
* Sets whether the natural height of the child should be calculated and propagated
* through the scrolled window’s requested natural height.
*/
void
gtk_scrolled_window_set_propagate_natural_height (GtkScrolledWindow *scrolled_window,
gboolean propagate)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
propagate = !!propagate;
if (priv->propagate_natural_height != propagate)
{
priv->propagate_natural_height = propagate;
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties [PROP_PROPAGATE_NATURAL_HEIGHT]);
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
/**
* gtk_scrolled_window_get_propagate_natural_height:
* @scrolled_window: a #GtkScrolledWindow
*
* Reports whether the natural height of the child will be calculated and propagated
* through the scrolled window’s requested natural height.
*
* Returns: whether natural height propagation is enabled.
*/
gboolean
gtk_scrolled_window_get_propagate_natural_height (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), -1);
return priv->propagate_natural_height;
}
/**
* gtk_scrolled_window_set_child:
* @scrolled_window: a #GtkScrolledWindow
* @child: (allow-none): the child widget
*
* Sets the child widget of @scrolled_window.
*/
void
gtk_scrolled_window_set_child (GtkScrolledWindow *scrolled_window,
GtkWidget *child)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
GtkWidget *scrollable_child;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
if (priv->child)
{
if (priv->auto_added_viewport)
{
gtk_viewport_set_child (GTK_VIEWPORT (priv->child), NULL);
}
g_object_set (priv->child,
"hadjustment", NULL,
"vadjustment", NULL,
NULL);
g_clear_pointer (&priv->child, gtk_widget_unparent);
}
if (child)
{
GtkAdjustment *hadj, *vadj;
/* gtk_scrolled_window_set_[hv]adjustment have the side-effect
* of creating the scrollbars
*/
if (!priv->hscrollbar)
gtk_scrolled_window_set_hadjustment (scrolled_window, NULL);
if (!priv->vscrollbar)
gtk_scrolled_window_set_vadjustment (scrolled_window, NULL);
hadj = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->hscrollbar));
vadj = gtk_scrollbar_get_adjustment (GTK_SCROLLBAR (priv->vscrollbar));
if (GTK_IS_SCROLLABLE (child))
{
scrollable_child = child;
priv->auto_added_viewport = FALSE;
}
else
{
scrollable_child = gtk_viewport_new (hadj, vadj);
gtk_viewport_set_child (GTK_VIEWPORT (scrollable_child), child);
priv->auto_added_viewport = TRUE;
}
priv->child = scrollable_child;
gtk_widget_insert_after (scrollable_child, GTK_WIDGET (scrolled_window), NULL);
g_object_set (scrollable_child,
"hadjustment", hadj,
"vadjustment", vadj,
NULL);
}
if (priv->child)
{
gtk_accessible_update_relation (GTK_ACCESSIBLE (priv->hscrollbar),
GTK_ACCESSIBLE_RELATION_CONTROLS, priv->child, NULL,
-1);
gtk_accessible_update_relation (GTK_ACCESSIBLE (priv->vscrollbar),
GTK_ACCESSIBLE_RELATION_CONTROLS, priv->child, NULL,
-1);
}
else
{
gtk_accessible_reset_relation (GTK_ACCESSIBLE (priv->hscrollbar),
GTK_ACCESSIBLE_RELATION_CONTROLS);
gtk_accessible_reset_relation (GTK_ACCESSIBLE (priv->vscrollbar),
GTK_ACCESSIBLE_RELATION_CONTROLS);
}
g_object_notify_by_pspec (G_OBJECT (scrolled_window), properties[PROP_CHILD]);
}
/**
* gtk_scrolled_window_get_child:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the child widget of @scrolled_window.
*
* Returns: (nullable) (transfer none): the child widget of @scrolled_window
*/
GtkWidget *
gtk_scrolled_window_get_child (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return priv->child;
}
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