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gtk2/gtk/gtkscrolledwindow.c
Timm Bäder 24c67efdfd scrolledwindow: Use g_clear_handle_id
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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)
{
g_clear_handle_id (&indicator->over_timeout_id, g_source_remove);
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)));
g_clear_handle_id (&indicator->over_timeout_id, g_source_remove);
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);
}
g_clear_handle_id (&priv->scroll_events_overshoot_id, g_source_remove);
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);
g_clear_handle_id (&priv->scroll_events_overshoot_id, g_source_remove);
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)
{
g_clear_handle_id (&indicator->conceil_timer, g_source_remove);
g_clear_handle_id (&indicator->over_timeout_id, g_source_remove);
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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