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gtk2/gtk/gtkscrolledwindow.c

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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 "gtkbindings.h"
#include "gtkdnd.h"
#include "gtkintl.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkscrollable.h"
#include "gtkscrollbar.h"
#include "gtkrangeprivate.h"
#include "gtktypebuiltins.h"
#include "gtkviewport.h"
#include "gtkwidgetprivate.h"
#include "gtkwindow.h"
#include "gtkkineticscrolling.h"
#include "a11y/gtkscrolledwindowaccessible.h"
#include <math.h>
/**
* SECTION:gtkscrolledwindow
* @Short_description: Adds scrollbars to its child widget
* @Title: GtkScrolledWindow
* @See_also: #GtkScrollable, #GtkViewport, #GtkAdjustment
*
* GtkScrolledWindow is a #GtkBin subclass: it’s a container
* the accepts a single child widget. GtkScrolledWindow adds scrollbars
* to the child widget and optionally draws a beveled frame around the
* child widget.
*
* The scrolled window can work in two ways. Some widgets have native
* scrolling support; these widgets implement the #GtkScrollable interface.
* Widgets with native scroll support include #GtkTreeView, #GtkTextView,
* and #GtkLayout.
*
* For widgets that lack native scrolling support, the #GtkViewport
* widget acts as an adaptor class, implementing scrollability for child
* widgets that lack their own scrolling capabilities. Use #GtkViewport
* to scroll child widgets such as #GtkGrid, #GtkBox, and so on.
*
* If a widget has native scrolling abilities, it can be added to the
* GtkScrolledWindow with gtk_container_add(). If a widget does not, you
* must first add the widget to a #GtkViewport, then add the #GtkViewport
* to the scrolled window. gtk_container_add() will do this for you for
* widgets that don’t implement #GtkScrollable natively, so you can
* ignore the presence of the viewport.
*
* The position of the scrollbars is controlled by the scroll adjustments.
* See #GtkAdjustment for the fields in an adjustment — for
* #GtkScrollbar, used by GtkScrolledWindow, the “value” field
* represents the position of the scrollbar, which must be between the
* “lower” field and “upper - page_size.” The “page_size” field
* represents the size of the visible scrollable area. The
* “step_increment” and “page_increment” fields are used when the user
* asks to step down (using the small stepper arrows) or page down (using
* for example the PageDown key).
*
* 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 overlayed 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.
*/
/* 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 overidden 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 specifc 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 specifc dimension (i.e. POLICY_NEVER).
*
* also, kinda obvious:
* 3) a user would certainly not have choosen 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
* specifc dimension than is required at minimum.
* B) from 1.1) follows: the requisition may be overidden 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.
*/
#define DEFAULT_SCROLLBAR_SPACING 3
#define TOUCH_BYPASS_CAPTURED_THRESHOLD 30
/* Kinetic scrolling */
#define MAX_OVERSHOOT_DISTANCE 100
#define DECELERATION_FRICTION 4
#define OVERSHOOT_FRICTION 20
/* 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
/* Scrolled off indication */
#define UNDERSHOOT_SIZE 40
typedef struct
{
GtkWidget *scrollbar;
GdkWindow *window;
gboolean dragging;
gboolean over;
gboolean enabled;
gint64 last_scroll_time;
guint conceil_timer;
gdouble current_pos;
gdouble source_pos;
gdouble target_pos;
gint64 start_time;
gint64 end_time;
guint tick_id;
guint over_timeout_id;
} Indicator;
struct _GtkScrolledWindowPrivate
{
GtkWidget *hscrollbar;
GtkWidget *vscrollbar;
Indicator hindicator;
Indicator vindicator;
GtkCornerType window_placement;
guint16 shadow_type;
guint hscrollbar_policy : 2;
guint vscrollbar_policy : 2;
guint hscrollbar_visible : 1;
guint vscrollbar_visible : 1;
guint focus_out : 1; /* Flag used by ::move-focus-out implementation */
guint overlay_scrolling : 1;
guint touch_mode : 1;
gint min_content_width;
gint min_content_height;
guint scroll_events_overshoot_id;
/* Kinetic scrolling */
GtkGesture *long_press_gesture;
GtkGesture *swipe_gesture;
/* These two gestures are mutually exclusive */
GtkGesture *drag_gesture;
GtkGesture *pan_gesture;
gdouble drag_start_x;
gdouble drag_start_y;
GdkDevice *drag_device;
guint kinetic_scrolling : 1;
guint capture_button_press : 1;
guint in_drag : 1;
guint deceleration_id;
gdouble x_velocity;
gdouble y_velocity;
gdouble unclamped_hadj_value;
gdouble unclamped_vadj_value;
};
typedef struct
{
GtkScrolledWindow *scrolled_window;
gint64 last_deceleration_time;
GtkKineticScrolling *hscrolling;
GtkKineticScrolling *vscrolling;
} KineticScrollData;
enum {
PROP_0,
PROP_HADJUSTMENT,
PROP_VADJUSTMENT,
PROP_HSCROLLBAR_POLICY,
PROP_VSCROLLBAR_POLICY,
PROP_WINDOW_PLACEMENT,
PROP_WINDOW_PLACEMENT_SET,
PROP_SHADOW_TYPE,
PROP_MIN_CONTENT_WIDTH,
PROP_MIN_CONTENT_HEIGHT,
PROP_KINETIC_SCROLLING,
PROP_OVERLAY_SCROLLING
};
/* Signals */
enum
{
SCROLL_CHILD,
MOVE_FOCUS_OUT,
EDGE_OVERSHOT,
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_destroy (GtkWidget *widget);
static gboolean gtk_scrolled_window_draw (GtkWidget *widget,
cairo_t *cr);
static void gtk_scrolled_window_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gtk_scrolled_window_scroll_event (GtkWidget *widget,
GdkEventScroll *event);
static gboolean gtk_scrolled_window_focus (GtkWidget *widget,
GtkDirectionType direction);
static void gtk_scrolled_window_add (GtkContainer *container,
GtkWidget *widget);
static void gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *widget);
static void gtk_scrolled_window_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
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(GtkWidget *widget,
GtkAllocation *allocation);
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_scrolled_window_should_animate (GtkScrolledWindow *sw);
static void gtk_scrolled_window_get_preferred_width (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
static void gtk_scrolled_window_get_preferred_height (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
static void gtk_scrolled_window_get_preferred_height_for_width (GtkWidget *layout,
gint width,
gint *minimum_height,
gint *natural_height);
static void gtk_scrolled_window_get_preferred_width_for_height (GtkWidget *layout,
gint width,
gint *minimum_height,
gint *natural_height);
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_unrealize (GtkWidget *widget);
static void gtk_scrolled_window_grab_notify (GtkWidget *widget,
gboolean was_grabbed);
static void _gtk_scrolled_window_set_adjustment_value (GtkScrolledWindow *scrolled_window,
GtkAdjustment *adjustment,
gdouble value);
static void gtk_scrolled_window_cancel_deceleration (GtkScrolledWindow *scrolled_window);
static gboolean _gtk_scrolled_window_get_overshoot (GtkScrolledWindow *scrolled_window,
gint *overshoot_x,
gint *overshoot_y);
static void gtk_scrolled_window_start_deceleration (GtkScrolledWindow *scrolled_window);
static gint _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window);
static void remove_indicator (GtkScrolledWindow *sw,
Indicator *indicator);
static void indicator_stop_fade (Indicator *indicator);
static gboolean maybe_hide_indicator (gpointer data);
static void indicator_start_fade (Indicator *indicator,
gdouble pos);
static void indicator_set_over (Indicator *indicator,
gboolean over);
static guint signals[LAST_SIGNAL] = {0};
G_DEFINE_TYPE_WITH_PRIVATE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN)
static void
add_scroll_binding (GtkBindingSet *binding_set,
guint keyval,
GdkModifierType mask,
GtkScrollType scroll,
gboolean horizontal)
{
guint keypad_keyval = keyval - GDK_KEY_Left + GDK_KEY_KP_Left;
gtk_binding_entry_add_signal (binding_set, keyval, mask,
"scroll-child", 2,
GTK_TYPE_SCROLL_TYPE, scroll,
G_TYPE_BOOLEAN, horizontal);
gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask,
"scroll-child", 2,
GTK_TYPE_SCROLL_TYPE, scroll,
G_TYPE_BOOLEAN, horizontal);
}
static void
add_tab_bindings (GtkBindingSet *binding_set,
GdkModifierType modifiers,
GtkDirectionType direction)
{
gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, modifiers,
"move-focus-out", 1,
GTK_TYPE_DIRECTION_TYPE, direction);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, modifiers,
"move-focus-out", 1,
GTK_TYPE_DIRECTION_TYPE, direction);
}
static gboolean
gtk_scrolled_window_leave_notify (GtkWidget *widget,
GdkEventCrossing *event)
{
GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW (widget)->priv;
indicator_set_over (&priv->hindicator, FALSE);
indicator_start_fade (&priv->hindicator, 0.0);
indicator_set_over (&priv->vindicator, FALSE);
indicator_start_fade (&priv->vindicator, 0.0);
return GDK_EVENT_PROPAGATE;
}
static void
gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
GtkBindingSet *binding_set;
widget_class = (GtkWidgetClass*) class;
container_class = (GtkContainerClass*) class;
gobject_class->set_property = gtk_scrolled_window_set_property;
gobject_class->get_property = gtk_scrolled_window_get_property;
widget_class->destroy = gtk_scrolled_window_destroy;
widget_class->draw = gtk_scrolled_window_draw;
widget_class->size_allocate = gtk_scrolled_window_size_allocate;
widget_class->scroll_event = gtk_scrolled_window_scroll_event;
widget_class->focus = gtk_scrolled_window_focus;
widget_class->get_preferred_width = gtk_scrolled_window_get_preferred_width;
widget_class->get_preferred_height = gtk_scrolled_window_get_preferred_height;
widget_class->get_preferred_height_for_width = gtk_scrolled_window_get_preferred_height_for_width;
widget_class->get_preferred_width_for_height = gtk_scrolled_window_get_preferred_width_for_height;
widget_class->map = gtk_scrolled_window_map;
widget_class->unmap = gtk_scrolled_window_unmap;
widget_class->grab_notify = gtk_scrolled_window_grab_notify;
widget_class->realize = gtk_scrolled_window_realize;
widget_class->unrealize = gtk_scrolled_window_unrealize;
widget_class->leave_notify_event = gtk_scrolled_window_leave_notify;
container_class->add = gtk_scrolled_window_add;
container_class->remove = gtk_scrolled_window_remove;
container_class->forall = gtk_scrolled_window_forall;
gtk_container_class_handle_border_width (container_class);
class->scrollbar_spacing = -1;
class->scroll_child = gtk_scrolled_window_scroll_child;
class->move_focus_out = gtk_scrolled_window_move_focus_out;
g_object_class_install_property (gobject_class,
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));
g_object_class_install_property (gobject_class,
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));
g_object_class_install_property (gobject_class,
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));
g_object_class_install_property (gobject_class,
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));
g_object_class_install_property (gobject_class,
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));
/**
* GtkScrolledWindow:window-placement-set:
*
* Whether "window-placement" should be used to determine the location
* of the contents with respect to the scrollbars.
*
* Since: 2.10
*
* Deprecated: 3.10: This value is ignored and
* #GtkScrolledWindow:window-placement value is always honored.
*/
g_object_class_install_property (gobject_class,
PROP_WINDOW_PLACEMENT_SET,
g_param_spec_boolean ("window-placement-set",
P_("Window Placement Set"),
P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."),
TRUE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
g_object_class_install_property (gobject_class,
PROP_SHADOW_TYPE,
g_param_spec_enum ("shadow-type",
P_("Shadow Type"),
P_("Style of bevel around the contents"),
GTK_TYPE_SHADOW_TYPE,
GTK_SHADOW_NONE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
/**
* GtkScrolledWindow:scrollbars-within-bevel:
*
* Whether to place scrollbars within the scrolled window's bevel.
*
* Since: 2.12
*/
gtk_widget_class_install_style_property (widget_class,
g_param_spec_boolean ("scrollbars-within-bevel",
P_("Scrollbars within bevel"),
P_("Place scrollbars within the scrolled window's bevel"),
FALSE,
GTK_PARAM_READABLE));
gtk_widget_class_install_style_property (widget_class,
g_param_spec_int ("scrollbar-spacing",
P_("Scrollbar spacing"),
P_("Number of pixels between the scrollbars and the scrolled window"),
0,
G_MAXINT,
DEFAULT_SCROLLBAR_SPACING,
GTK_PARAM_READABLE));
/**
* GtkScrolledWindow:min-content-width:
*
* The minimum content width of @scrolled_window, or -1 if not set.
*
* Since: 3.0
*/
g_object_class_install_property (gobject_class,
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.
*
* Since: 3.0
*/
g_object_class_install_property (gobject_class,
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.
*
* Since: 3.4
*/
g_object_class_install_property (gobject_class,
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 overlayed on top of the content,
* as narrow indicators.
*
* Since: 3.16
*/
g_object_class_install_property (gobject_class,
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::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][GtkBindingSignal]
* which gets emitted when a keybinding that scrolls is pressed.
* The horizontal or vertical adjustment is updated which triggers a
* signal that the scrolled windows 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][GtkBindingSignal] 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 windows toplevel parent in the
* container hierarchy. The default bindings for this signal are
* `Tab + Ctrl` and `Tab + Ctrl + Shift`.
*/
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,
_gtk_marshal_VOID__ENUM,
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 scrolledwindow firmly surpass (ie. with some edge resistance)
* the lower or upper limits defined by the adjustment in that orientation.
*
* If a similar behavior without edge resistance is desired, one alternative
* may be to check on #GtkAdjustment::value-changed that the value equals
* either #GtkAdjustment:lower or #GtkAdjustment:upper - #GtkAdjustment:page-size.
*
* Note: The @pos argument is LTR/RTL aware, so callers should be aware too
* if intending to provide behavior on horizontal edges.
*
* Since: 3.16
*/
signals[EDGE_OVERSHOT] =
g_signal_new (I_("edge-overshot"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST, 0,
NULL, NULL,
g_cclosure_marshal_generic,
G_TYPE_NONE, 1, GTK_TYPE_POSITION_TYPE);
binding_set = gtk_binding_set_by_class (class);
add_scroll_binding (binding_set, GDK_KEY_Left, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE);
add_scroll_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, TRUE);
add_scroll_binding (binding_set, GDK_KEY_Up, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE);
add_scroll_binding (binding_set, GDK_KEY_Down, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, FALSE);
add_scroll_binding (binding_set, GDK_KEY_Page_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE);
add_scroll_binding (binding_set, GDK_KEY_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD, TRUE);
add_scroll_binding (binding_set, GDK_KEY_Page_Up, 0, GTK_SCROLL_PAGE_BACKWARD, FALSE);
add_scroll_binding (binding_set, GDK_KEY_Page_Down, 0, GTK_SCROLL_PAGE_FORWARD, FALSE);
add_scroll_binding (binding_set, GDK_KEY_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE);
add_scroll_binding (binding_set, GDK_KEY_End, GDK_CONTROL_MASK, GTK_SCROLL_END, TRUE);
add_scroll_binding (binding_set, GDK_KEY_Home, 0, GTK_SCROLL_START, FALSE);
add_scroll_binding (binding_set, GDK_KEY_End, 0, GTK_SCROLL_END, FALSE);
add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_SCROLLED_WINDOW_ACCESSIBLE);
}
static gboolean
may_hscroll (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
return priv->hscrollbar_visible || priv->hscrollbar_policy == GTK_POLICY_EXTERNAL;
}
static gboolean
may_vscroll (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
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,
gdouble start_x,
gdouble start_y,
GtkGesture *gesture)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkEventSequenceState state;
GdkEventSequence *sequence;
GtkWidget *event_widget;
const GdkEvent *event;
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 = gtk_gesture_get_last_event (gesture, sequence);
event_widget = gtk_get_event_widget ((GdkEvent *) event);
if (event_widget == priv->vscrollbar || event_widget == priv->hscrollbar ||
(!may_hscroll (scrolled_window) && !may_vscroll (scrolled_window)))
state = GTK_EVENT_SEQUENCE_DENIED;
else if (priv->capture_button_press)
state = GTK_EVENT_SEQUENCE_CLAIMED;
else
return;
gtk_gesture_set_sequence_state (gesture, sequence, state);
}
static void
gtk_scrolled_window_invalidate_overshoot (GtkScrolledWindow *scrolled_window)
{
GtkAllocation child_allocation, allocation;
gint overshoot_x, overshoot_y;
GdkRectangle rect;
if (!_gtk_scrolled_window_get_overshoot (scrolled_window, &overshoot_x, &overshoot_y))
return;
gtk_widget_get_allocation (GTK_WIDGET (scrolled_window), &allocation);
gtk_scrolled_window_relative_allocation (GTK_WIDGET (scrolled_window),
&child_allocation);
child_allocation.x += allocation.x;
child_allocation.y += allocation.y;
if (overshoot_x != 0)
{
if (overshoot_x < 0)
rect.x = child_allocation.x;
else
rect.x = child_allocation.x + child_allocation.width - MAX_OVERSHOOT_DISTANCE;
rect.y = child_allocation.y;
rect.width = MAX_OVERSHOOT_DISTANCE;
rect.height = child_allocation.height;
gdk_window_invalidate_rect (gtk_widget_get_window (GTK_WIDGET (scrolled_window)),
&rect, TRUE);
}
if (overshoot_y != 0)
{
if (overshoot_y < 0)
rect.y = child_allocation.y;
else
rect.y = child_allocation.y + child_allocation.height - MAX_OVERSHOOT_DISTANCE;
rect.x = child_allocation.x;
rect.width = child_allocation.width;
rect.height = MAX_OVERSHOOT_DISTANCE;
gdk_window_invalidate_rect (gtk_widget_get_window (GTK_WIDGET (scrolled_window)),
&rect, TRUE);
}
}
static void
scrolled_window_drag_update_cb (GtkScrolledWindow *scrolled_window,
gdouble offset_x,
gdouble offset_y,
GtkGesture *gesture)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkAdjustment *hadjustment;
GtkAdjustment *vadjustment;
gdouble dx, dy;
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
if (!priv->capture_button_press)
{
GdkEventSequence *sequence;
sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
gtk_gesture_set_sequence_state (gesture, sequence,
GTK_EVENT_SEQUENCE_CLAIMED);
}
hadjustment = gtk_range_get_adjustment (GTK_RANGE (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_range_get_adjustment (GTK_RANGE (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 = scrolled_window->priv;
if (!priv->in_drag || !gtk_gesture_handles_sequence (gesture, sequence))
gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
}
static void
scrolled_window_swipe_cb (GtkScrolledWindow *scrolled_window,
gdouble x_velocity,
gdouble y_velocity)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
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_long_press_cb (GtkScrolledWindow *scrolled_window,
gdouble x,
gdouble 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 = scrolled_window->priv;
GdkEventSequence *sequence;
const GdkEvent *event;
sequence = gtk_gesture_get_last_updated_sequence (gesture);
event = gtk_gesture_get_last_event (gesture, sequence);
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 = sw->priv;
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)
{
GtkStyleContext *context;
if (indicator->over_timeout_id)
{
g_source_remove (indicator->over_timeout_id);
indicator->over_timeout_id = 0;
}
if (indicator->over == over)
return;
context = gtk_widget_get_style_context (indicator->scrollbar);
indicator->over = over;
if (indicator->over)
gtk_style_context_add_class (context, "hovering");
else
gtk_style_context_remove_class (context, "hovering");
gtk_widget_queue_resize (indicator->scrollbar);
}
static gboolean
event_close_to_indicator (GtkScrolledWindow *sw,
Indicator *indicator,
GdkEvent *event)
{
GtkAllocation alloc, indicator_alloc;
GtkScrolledWindowPrivate *priv;
GtkWidget *event_widget;
gint win_x, win_y;
gdouble x, y;
priv = sw->priv;
event_widget = gtk_get_event_widget (event);
gdk_event_get_coords (event, &x, &y);
gtk_widget_get_allocation (GTK_WIDGET (sw), &alloc);
gtk_widget_get_allocation (indicator->scrollbar, &indicator_alloc);
gdk_window_get_position (indicator->window, &win_x, &win_y);
if (event->any.window == indicator->window ||
event_widget == indicator->scrollbar)
{
gint xcoord = x, ycoord = y;
gtk_widget_translate_coordinates (indicator->scrollbar,
GTK_WIDGET (sw),
xcoord, ycoord,
&xcoord, &ycoord);
x = xcoord;
y = ycoord;
}
if ((indicator == &priv->hindicator &&
y >= win_y - 50 &&
y < win_y + indicator_alloc.height + 50) ||
(indicator == &priv->vindicator &&
x >= win_x - 50 &&
x < win_x + indicator_alloc.width + 50))
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,
GdkEvent *event)
{
gboolean indicator_close;
indicator_close = event_close_to_indicator (sw, indicator, event);
if (indicator->over_timeout_id)
{
g_source_remove (indicator->over_timeout_id);
indicator->over_timeout_id = 0;
}
if (indicator_close)
indicator->over_timeout_id = gdk_threads_add_timeout (30, enable_over_timeout_cb, indicator);
else
indicator_set_over (indicator, FALSE);
return indicator_close;
}
static gboolean
captured_event_cb (GtkWidget *widget,
GdkEvent *event)
{
GtkScrolledWindowPrivate *priv;
GtkScrolledWindow *sw;
GdkInputSource input_source;
GdkDevice *source_device;
gboolean indicator_close;
if (event->type != GDK_MOTION_NOTIFY &&
event->type != GDK_LEAVE_NOTIFY)
return GDK_EVENT_PROPAGATE;
sw = GTK_SCROLLED_WINDOW (widget);
priv = sw->priv;
source_device = gdk_event_get_source_device (event);
input_source = gdk_device_get_source (source_device);
if (input_source != GDK_SOURCE_MOUSE &&
input_source != GDK_SOURCE_TOUCHPAD)
return GDK_EVENT_PROPAGATE;
if (event->type == GDK_MOTION_NOTIFY)
{
indicator_start_fade (&priv->hindicator, 1.0);
indicator_start_fade (&priv->vindicator, 1.0);
/* Check whether we're hovering close to the vertical scrollbar */
indicator_close = check_update_scrollbar_proximity (sw, &priv->vindicator,
event);
if (!indicator_close)
{
/* Otherwise check the vertical scrollbar */
check_update_scrollbar_proximity (sw, &priv->hindicator, event);
}
else
indicator_set_over (&priv->hindicator, FALSE);
}
else if (event->type == GDK_LEAVE_NOTIFY &&
event->crossing.mode == GDK_CROSSING_UNGRAB)
{
GtkWidget *scrollbar;
scrollbar = gtk_get_event_widget (event);
if (scrollbar == priv->hindicator.scrollbar)
check_update_scrollbar_proximity (sw, &priv->hindicator, event);
else if (scrollbar == priv->vindicator.scrollbar)
check_update_scrollbar_proximity (sw, &priv->vindicator, event);
}
return GDK_EVENT_PROPAGATE;
}
static void
gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
{
GtkWidget *widget = GTK_WIDGET (scrolled_window);
GtkScrolledWindowPrivate *priv;
scrolled_window->priv = priv =
gtk_scrolled_window_get_instance_private (scrolled_window);
gtk_widget_set_has_window (widget, TRUE);
gtk_widget_set_can_focus (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->window_placement = GTK_CORNER_TOP_LEFT;
priv->min_content_width = -1;
priv->min_content_height = -1;
priv->overlay_scrolling = TRUE;
priv->drag_gesture = gtk_gesture_drag_new (widget);
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);
priv->pan_gesture = gtk_gesture_pan_new (widget, GTK_ORIENTATION_VERTICAL);
gtk_gesture_group (priv->pan_gesture, priv->drag_gesture);
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->pan_gesture), TRUE);
priv->swipe_gesture = gtk_gesture_swipe_new (widget);
gtk_gesture_group (priv->swipe_gesture, priv->drag_gesture);
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);
priv->long_press_gesture = gtk_gesture_long_press_new (widget);
gtk_gesture_group (priv->long_press_gesture, priv->drag_gesture);
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_scrolled_window_set_kinetic_scrolling (scrolled_window, TRUE);
gtk_scrolled_window_set_capture_button_press (scrolled_window, TRUE);
_gtk_widget_set_captured_event_handler (widget, captured_event_cb);
}
/**
* gtk_scrolled_window_new:
* @hadjustment: (allow-none): horizontal adjustment
* @vadjustment: (allow-none): vertical adjustment
*
* Creates a new scrolled window.
*
* The two arguments are the scrolled window’s adjustments; these will be
* shared with the scrollbars and the child widget to keep the bars in sync
* with the child. Usually you want to pass %NULL for the adjustments, which
* will cause the scrolled window to create them for you.
*
* Returns: a new scrolled window
*/
GtkWidget*
gtk_scrolled_window_new (GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
GtkWidget *scrolled_window;
if (hadjustment)
g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL);
if (vadjustment)
g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL);
scrolled_window = g_object_new (GTK_TYPE_SCROLLED_WINDOW,
"hadjustment", hadjustment,
"vadjustment", vadjustment,
NULL);
return scrolled_window;
}
/**
* gtk_scrolled_window_set_hadjustment:
* @scrolled_window: a #GtkScrolledWindow
* @hadjustment: horizontal scroll adjustment
*
* Sets the #GtkAdjustment for the horizontal scrollbar.
*/
void
gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
GtkAdjustment *hadjustment)
{
GtkScrolledWindowPrivate *priv;
GtkBin *bin;
GtkWidget *child;
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);
bin = GTK_BIN (scrolled_window);
priv = scrolled_window->priv;
if (!priv->hscrollbar)
{
priv->hscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_HORIZONTAL, hadjustment);
gtk_widget_set_parent (priv->hscrollbar, GTK_WIDGET (scrolled_window));
g_object_ref (priv->hscrollbar);
gtk_widget_show (priv->hscrollbar);
}
else
{
GtkAdjustment *old_adjustment;
old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
if (old_adjustment == hadjustment)
return;
g_signal_handlers_disconnect_by_func (old_adjustment,
gtk_scrolled_window_adjustment_changed,
scrolled_window);
gtk_adjustment_enable_animation (old_adjustment, NULL, 0);
gtk_range_set_adjustment (GTK_RANGE (priv->hscrollbar), hadjustment);
}
hadjustment = gtk_range_get_adjustment (GTK_RANGE (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);
child = gtk_bin_get_child (bin);
if (GTK_IS_SCROLLABLE (child))
gtk_scrollable_set_hadjustment (GTK_SCROLLABLE (child), hadjustment);
if (gtk_scrolled_window_should_animate (scrolled_window))
gtk_adjustment_enable_animation (hadjustment, gtk_widget_get_frame_clock (GTK_WIDGET (scrolled_window)), ANIMATION_DURATION);
g_object_notify (G_OBJECT (scrolled_window), "hadjustment");
}
/**
* gtk_scrolled_window_set_vadjustment:
* @scrolled_window: a #GtkScrolledWindow
* @vadjustment: vertical scroll adjustment
*
* Sets the #GtkAdjustment for the vertical scrollbar.
*/
void
gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
GtkAdjustment *vadjustment)
{
GtkScrolledWindowPrivate *priv;
GtkBin *bin;
GtkWidget *child;
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);
bin = GTK_BIN (scrolled_window);
priv = scrolled_window->priv;
if (!priv->vscrollbar)
{
priv->vscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, vadjustment);
gtk_widget_set_parent (priv->vscrollbar, GTK_WIDGET (scrolled_window));
g_object_ref (priv->vscrollbar);
gtk_widget_show (priv->vscrollbar);
}
else
{
GtkAdjustment *old_adjustment;
old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
if (old_adjustment == vadjustment)
return;
g_signal_handlers_disconnect_by_func (old_adjustment,
gtk_scrolled_window_adjustment_changed,
scrolled_window);
gtk_adjustment_enable_animation (old_adjustment, NULL, 0);
gtk_range_set_adjustment (GTK_RANGE (priv->vscrollbar), vadjustment);
}
vadjustment = gtk_range_get_adjustment (GTK_RANGE (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);
child = gtk_bin_get_child (bin);
if (GTK_IS_SCROLLABLE (child))
gtk_scrollable_set_vadjustment (GTK_SCROLLABLE (child), vadjustment);
if (gtk_scrolled_window_should_animate (scrolled_window))
gtk_adjustment_enable_animation (vadjustment, gtk_widget_get_frame_clock (GTK_WIDGET (scrolled_window)), ANIMATION_DURATION);
g_object_notify (G_OBJECT (scrolled_window), "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;
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
priv = scrolled_window->priv;
return gtk_range_get_adjustment (GTK_RANGE (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;
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
priv = scrolled_window->priv;
return gtk_range_get_adjustment (GTK_RANGE (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.
*
* Since: 2.8
*/
GtkWidget*
gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return scrolled_window->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.
*
* Since: 2.8
*/
GtkWidget*
gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);
return scrolled_window->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;
GObject *object = G_OBJECT (scrolled_window);
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
priv = scrolled_window->priv;
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_freeze_notify (object);
g_object_notify (object, "hscrollbar-policy");
g_object_notify (object, "vscrollbar-policy");
g_object_thaw_notify (object);
}
}
/**
* gtk_scrolled_window_get_policy:
* @scrolled_window: a #GtkScrolledWindow
* @hscrollbar_policy: (out) (allow-none): location to store the policy
* for the horizontal scrollbar, or %NULL
* @vscrollbar_policy: (out) (allow-none): 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;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
priv = scrolled_window->priv;
if (hscrollbar_policy)
*hscrollbar_policy = priv->hscrollbar_policy;
if (vscrollbar_policy)
*vscrollbar_policy = priv->vscrollbar_policy;
}
static void
gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window,
GtkCornerType window_placement)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
if (priv->window_placement != window_placement)
{
priv->window_placement = window_placement;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify (G_OBJECT (scrolled_window), "window-placement");
}
}
/**
* 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)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
gtk_scrolled_window_set_placement_internal (scrolled_window, 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)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT);
return scrolled_window->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().
*
* Since: 2.10
**/
void
gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
gtk_scrolled_window_set_placement_internal (scrolled_window, GTK_CORNER_TOP_LEFT);
}
/**
* gtk_scrolled_window_set_shadow_type:
* @scrolled_window: a #GtkScrolledWindow
* @type: kind of shadow to draw around scrolled window contents
*
* Changes the type of shadow drawn around the contents of
* @scrolled_window.
**/
void
gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
GtkShadowType type)
{
GtkScrolledWindowPrivate *priv;
GtkStyleContext *context;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT);
priv = scrolled_window->priv;
if (priv->shadow_type != type)
{
priv->shadow_type = type;
context = gtk_widget_get_style_context (GTK_WIDGET (scrolled_window));
if (type != GTK_SHADOW_NONE)
gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
else
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_FRAME);
if (gtk_widget_is_drawable (GTK_WIDGET (scrolled_window)))
gtk_widget_queue_draw (GTK_WIDGET (scrolled_window));
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify (G_OBJECT (scrolled_window), "shadow-type");
}
}
/**
* gtk_scrolled_window_get_shadow_type:
* @scrolled_window: a #GtkScrolledWindow
*
* Gets the shadow type of the scrolled window. See
* gtk_scrolled_window_set_shadow_type().
*
* Returns: the current shadow type
**/
GtkShadowType
gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE);
return scrolled_window->priv->shadow_type;
}
/**
* 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.
*
* Since: 3.4
**/
void
gtk_scrolled_window_set_kinetic_scrolling (GtkScrolledWindow *scrolled_window,
gboolean kinetic_scrolling)
{
GtkPropagationPhase phase = GTK_PHASE_NONE;
GtkScrolledWindowPrivate *priv;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
priv = scrolled_window->priv;
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 (G_OBJECT (scrolled_window), "kinetic-scrolling");
}
/**
* gtk_scrolled_window_get_kinetic_scrolling:
* @scrolled_window: a #GtkScrolledWindow
*
* Returns the specified kinetic scrolling behavior.
*
* Returns: the scrolling behavior flags.
*
* Since: 3.4
*/
gboolean
gtk_scrolled_window_get_kinetic_scrolling (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), FALSE);
return scrolled_window->priv->kinetic_scrolling;
}
/**
* gtk_scrolled_window_set_capture_button_press:
* @scrolled_window: a #GtkScrolledWindow
* @capture_button_press: %TRUE to capture button presses
*
* Changes the behaviour of @scrolled_window wrt. to the initial
* event that possibly starts kinetic scrolling. When @capture_button_press
* is set to %TRUE, the event is captured by the scrolled window, and
* then later replayed if it is meant to go to the child widget.
*
* This should be enabled if any child widgets perform non-reversible
* actions on #GtkWidget::button-press-event. If they don't, and handle
* additionally handle #GtkWidget::grab-broken-event, it might be better
* to set @capture_button_press to %FALSE.
*
* This setting only has an effect if kinetic scrolling is enabled.
*
* Since: 3.4
*/
void
gtk_scrolled_window_set_capture_button_press (GtkScrolledWindow *scrolled_window,
gboolean capture_button_press)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
scrolled_window->priv->capture_button_press = capture_button_press;
}
/**
* gtk_scrolled_window_get_capture_button_press:
* @scrolled_window: a #GtkScrolledWindow
*
* Return whether button presses are captured during kinetic
* scrolling. See gtk_scrolled_window_set_capture_button_press().
*
* Returns: %TRUE if button presses are captured during kinetic scrolling
*
* Since: 3.4
*/
gboolean
gtk_scrolled_window_get_capture_button_press (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), FALSE);
return scrolled_window->priv->capture_button_press;
}
static void
gtk_scrolled_window_destroy (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
remove_indicator (scrolled_window, &priv->hindicator);
remove_indicator (scrolled_window, &priv->vindicator);
if (priv->hscrollbar)
{
g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)),
gtk_scrolled_window_adjustment_changed,
scrolled_window);
gtk_widget_unparent (priv->hscrollbar);
gtk_widget_destroy (priv->hscrollbar);
g_object_unref (priv->hscrollbar);
priv->hscrollbar = NULL;
}
if (priv->vscrollbar)
{
g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)),
gtk_scrolled_window_adjustment_changed,
scrolled_window);
gtk_widget_unparent (priv->vscrollbar);
gtk_widget_destroy (priv->vscrollbar);
g_object_unref (priv->vscrollbar);
priv->vscrollbar = NULL;
}
if (priv->deceleration_id)
{
gtk_widget_remove_tick_callback (widget, priv->deceleration_id);
priv->deceleration_id = 0;
}
if (priv->scroll_events_overshoot_id)
{
g_source_remove (priv->scroll_events_overshoot_id);
priv->scroll_events_overshoot_id = 0;
}
g_clear_object (&priv->drag_gesture);
g_clear_object (&priv->swipe_gesture);
g_clear_object (&priv->long_press_gesture);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->destroy (widget);
}
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 = scrolled_window->priv;
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_internal (scrolled_window,
g_value_get_enum (value));
break;
case PROP_WINDOW_PLACEMENT_SET:
/* noop */
break;
case PROP_SHADOW_TYPE:
gtk_scrolled_window_set_shadow_type (scrolled_window,
g_value_get_enum (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;
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 = scrolled_window->priv;
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_WINDOW_PLACEMENT_SET:
g_value_set_boolean (value, TRUE);
break;
case PROP_SHADOW_TYPE:
g_value_set_enum (value, priv->shadow_type);
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;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scrolled_window_draw_scrollbars_junction (GtkScrolledWindow *scrolled_window,
cairo_t *cr)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkWidget *widget = GTK_WIDGET (scrolled_window);
GtkAllocation hscr_allocation, vscr_allocation;
GtkStyleContext *context;
GdkRectangle junction_rect;
gboolean is_rtl, scrollbars_within_bevel;
is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
gtk_widget_get_allocation (GTK_WIDGET (priv->hscrollbar), &hscr_allocation);
gtk_widget_get_allocation (GTK_WIDGET (priv->vscrollbar), &vscr_allocation);
gtk_widget_style_get (widget,
"scrollbars-within-bevel", &scrollbars_within_bevel,
NULL);
context = gtk_widget_get_style_context (widget);
if (scrollbars_within_bevel &&
priv->shadow_type != GTK_SHADOW_NONE)
{
GtkStateFlags state;
GtkBorder padding, border;
state = gtk_widget_get_state_flags (widget);
gtk_style_context_get_padding (context, state, &padding);
gtk_style_context_get_border (context, state, &border);
junction_rect.x = padding.left + border.left;
junction_rect.y = padding.top + border.top;
}
else
{
junction_rect.x = 0;
junction_rect.y = 0;
}
junction_rect.width = vscr_allocation.width;
junction_rect.height = hscr_allocation.height;
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)))
junction_rect.x += hscr_allocation.width;
if (priv->window_placement == GTK_CORNER_TOP_LEFT ||
priv->window_placement == GTK_CORNER_TOP_RIGHT)
junction_rect.y += vscr_allocation.height;
gtk_style_context_save (context);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_SCROLLBARS_JUNCTION);
gtk_render_background (context, cr,
junction_rect.x, junction_rect.y,
junction_rect.width, junction_rect.height);
gtk_render_frame (context, cr,
junction_rect.x, junction_rect.y,
junction_rect.width, junction_rect.height);
gtk_style_context_restore (context);
}
static void
gtk_scrolled_window_inner_allocation (GtkWidget *widget,
GtkAllocation *rect)
{
GtkWidget *child;
GtkBorder border = { 0 };
gtk_scrolled_window_relative_allocation (widget, rect);
child = gtk_bin_get_child (GTK_BIN (widget));
if (GTK_IS_SCROLLABLE (child) &&
gtk_scrollable_get_border (GTK_SCROLLABLE (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_draw_overshoot (GtkScrolledWindow *scrolled_window,
cairo_t *cr)
{
GtkWidget *widget = GTK_WIDGET (scrolled_window);
gint 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 (widget, &rect);
overshoot_x = CLAMP (overshoot_x, - MAX_OVERSHOOT_DISTANCE, MAX_OVERSHOOT_DISTANCE);
overshoot_y = CLAMP (overshoot_y, - MAX_OVERSHOOT_DISTANCE, MAX_OVERSHOOT_DISTANCE);
gtk_style_context_save (context);
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_FRAME);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_OVERSHOOT);
if (overshoot_x > 0)
{
gtk_style_context_add_class (context, GTK_STYLE_CLASS_RIGHT);
gtk_render_background (context, cr, rect.x + rect.width - overshoot_x, rect.y, overshoot_x, rect.height);
gtk_render_frame (context, cr, rect.x + rect.width - overshoot_x, rect.y, overshoot_x, rect.height);
}
else if (overshoot_x < 0)
{
gtk_style_context_add_class (context, GTK_STYLE_CLASS_LEFT);
gtk_render_background (context, cr, rect.x, rect.y, -overshoot_x, rect.height);
gtk_render_frame (context, cr, rect.x, rect.y, -overshoot_x, rect.height);
}
gtk_style_context_restore (context);
gtk_style_context_save (context);
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_FRAME);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_OVERSHOOT);
if (overshoot_y > 0)
{
gtk_style_context_add_class (context, GTK_STYLE_CLASS_BOTTOM);
gtk_render_background (context, cr, rect.x, rect.y + rect.height - overshoot_y, rect.width, overshoot_y);
gtk_render_frame (context, cr, rect.x, rect.y + rect.height - overshoot_y, rect.width, overshoot_y);
}
else if (overshoot_y < 0)
{
gtk_style_context_add_class (context, GTK_STYLE_CLASS_TOP);
gtk_render_background (context, cr, rect.x, rect.y, rect.width, -overshoot_y);
gtk_render_frame (context, cr, rect.x, rect.y, rect.width, -overshoot_y);
}
gtk_style_context_restore (context);
}
static void
gtk_scrolled_window_draw_undershoot (GtkScrolledWindow *scrolled_window,
cairo_t *cr)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkWidget *widget = GTK_WIDGET (scrolled_window);
GtkStyleContext *context;
GdkRectangle rect;
GtkAdjustment *adj;
context = gtk_widget_get_style_context (widget);
gtk_scrolled_window_inner_allocation (widget, &rect);
gtk_style_context_save (context);
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_FRAME);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_UNDERSHOOT);
adj = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
if (gtk_adjustment_get_value (adj) < gtk_adjustment_get_upper (adj) - gtk_adjustment_get_page_size (adj))
{
gtk_style_context_add_class (context, GTK_STYLE_CLASS_RIGHT);
gtk_render_background (context, cr, rect.x + rect.width - UNDERSHOOT_SIZE, rect.y, UNDERSHOOT_SIZE, rect.height);
gtk_render_frame (context, cr, rect.x + rect.width - UNDERSHOOT_SIZE, rect.y, UNDERSHOOT_SIZE, rect.height);
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_RIGHT);
}
if (gtk_adjustment_get_value (adj) > gtk_adjustment_get_lower (adj))
{
gtk_style_context_add_class (context, GTK_STYLE_CLASS_LEFT);
gtk_render_background (context, cr, rect.x, rect.y, UNDERSHOOT_SIZE, rect.height);
gtk_render_frame (context, cr, rect.x, rect.y, UNDERSHOOT_SIZE, rect.height);
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_LEFT);
}
adj = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
if (gtk_adjustment_get_value (adj) < gtk_adjustment_get_upper (adj) - gtk_adjustment_get_page_size (adj))
{
gtk_style_context_add_class (context, GTK_STYLE_CLASS_BOTTOM);
gtk_render_background (context, cr, rect.x, rect.y + rect.height - UNDERSHOOT_SIZE, rect.width, UNDERSHOOT_SIZE);
gtk_render_frame (context, cr, rect.x, rect.y + rect.height - UNDERSHOOT_SIZE, rect.width, UNDERSHOOT_SIZE);
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_BOTTOM);
}
if (gtk_adjustment_get_value (adj) > gtk_adjustment_get_lower (adj))
{
gtk_style_context_add_class (context, GTK_STYLE_CLASS_TOP);
gtk_render_background (context, cr, rect.x, rect.y, rect.width, UNDERSHOOT_SIZE);
gtk_render_frame (context, cr, rect.x, rect.y, rect.width, UNDERSHOOT_SIZE);
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_TOP);
}
gtk_style_context_restore (context);
}
static gboolean
gtk_scrolled_window_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkAllocation relative_allocation;
GtkStyleContext *context;
gboolean scrollbars_within_bevel;
if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)))
{
context = gtk_widget_get_style_context (widget);
gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
gtk_render_background (context, cr,
0, 0,
gtk_widget_get_allocated_width (widget),
gtk_widget_get_allocated_height (widget));
if (priv->hscrollbar_visible &&
priv->vscrollbar_visible)
gtk_scrolled_window_draw_scrollbars_junction (scrolled_window, cr);
gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
if (!scrollbars_within_bevel)
{
GtkStateFlags state;
GtkBorder padding, border;
state = gtk_widget_get_state_flags (widget);
gtk_style_context_get_padding (context, state, &padding);
gtk_style_context_get_border (context, state, &border);
relative_allocation.x -= padding.left + border.left;
relative_allocation.y -= padding.top + border.top;
relative_allocation.width += padding.left + padding.right + border.left + border.right;
relative_allocation.height += padding.top + padding.bottom + border.top + border.bottom;
}
else
{
relative_allocation.x = 0;
relative_allocation.y = 0;
relative_allocation.width = gtk_widget_get_allocated_width (widget);
relative_allocation.height = gtk_widget_get_allocated_height (widget);
}
gtk_render_frame (context, cr,
relative_allocation.x,
relative_allocation.y,
relative_allocation.width,
relative_allocation.height);
}
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->draw (widget, cr);
if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)))
{
gtk_scrolled_window_draw_undershoot (scrolled_window, cr);
gtk_scrolled_window_draw_overshoot (scrolled_window, cr);
}
return FALSE;
}
static void
gtk_scrolled_window_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
GtkScrolledWindowPrivate *priv;
GtkScrolledWindow *scrolled_window;
GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container,
include_internals,
callback,
callback_data);
if (include_internals)
{
scrolled_window = GTK_SCROLLED_WINDOW (container);
priv = scrolled_window->priv;
if (priv->vscrollbar)
callback (priv->vscrollbar, callback_data);
if (priv->hscrollbar)
callback (priv->hscrollbar, callback_data);
}
}
static gboolean
gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
GtkScrollType scroll,
gboolean horizontal)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
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;
default:
g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll);
return FALSE;
}
if (horizontal)
adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
else
adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
if (adjustment)
{
gdouble 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;
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 = scrolled_window->priv;
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_get_toplevel (GTK_WIDGET (scrolled_window));
if (!gtk_widget_is_toplevel (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 (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkAllocation widget_allocation;
GtkScrolledWindow *scrolled_window;
GtkScrolledWindowPrivate *priv;
gint sb_spacing;
gint sb_width;
gint sb_height;
g_return_if_fail (widget != NULL);
g_return_if_fail (allocation != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
priv = scrolled_window->priv;
/* Get possible scrollbar dimensions */
sb_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
gtk_widget_get_preferred_height (priv->hscrollbar, &sb_height, NULL);
gtk_widget_get_preferred_width (priv->vscrollbar, &sb_width, NULL);
gtk_widget_get_allocation (widget, &widget_allocation);
allocation->x = 0;
allocation->y = 0;
allocation->width = widget_allocation.width;
allocation->height = widget_allocation.height;
/* Subtract some things from our available allocation size */
if (priv->shadow_type != GTK_SHADOW_NONE)
{
GtkStyleContext *context;
GtkStateFlags state;
GtkBorder padding, border;
context = gtk_widget_get_style_context (widget);
state = gtk_widget_get_state_flags (widget);
gtk_style_context_save (context);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
gtk_style_context_get_border (context, state, &border);
gtk_style_context_get_padding (context, state, &padding);
allocation->x += padding.left + border.left;
allocation->y += padding.top + border.top;
allocation->width = MAX (1, allocation->width - (padding.left + border.left + padding.right + border.right));
allocation->height = MAX (1, allocation->height - (padding.top + border.top + padding.bottom + border.bottom));
gtk_style_context_restore (context);
}
if (priv->vscrollbar_visible && !priv->touch_mode)
{
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)))
allocation->x += (sb_width + sb_spacing);
allocation->width = MAX (1, allocation->width - (sb_width + sb_spacing));
}
if (priv->hscrollbar_visible && !priv->touch_mode)
{
if (priv->window_placement == GTK_CORNER_BOTTOM_LEFT ||
priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)
allocation->y += (sb_height + sb_spacing);
allocation->height = MAX (1, allocation->height - (sb_height + sb_spacing));
}
}
static gboolean
_gtk_scrolled_window_get_overshoot (GtkScrolledWindow *scrolled_window,
gint *overshoot_x,
gint *overshoot_y)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkAdjustment *vadjustment, *hadjustment;
gdouble lower, upper, x, y;
/* Vertical overshoot */
vadjustment = gtk_range_get_adjustment (GTK_RANGE (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_range_get_adjustment (GTK_RANGE (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,
GtkAllocation *relative_allocation)
{
GtkWidget *widget = GTK_WIDGET (swindow), *child;
GtkAllocation allocation;
GtkAllocation child_allocation;
child = gtk_bin_get_child (GTK_BIN (widget));
gtk_widget_get_allocation (widget, &allocation);
gtk_scrolled_window_relative_allocation (widget, relative_allocation);
child_allocation.x = relative_allocation->x;
child_allocation.y = relative_allocation->y;
child_allocation.width = relative_allocation->width;
child_allocation.height = relative_allocation->height;
gtk_widget_size_allocate (child, &child_allocation);
}
static void
gtk_scrolled_window_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkScrolledWindow *scrolled_window;
GtkScrolledWindowPrivate *priv;
GtkStyleContext *context;
GtkStateFlags state;
GtkBorder padding, border;
GtkBin *bin;
GtkAllocation relative_allocation;
GtkAllocation child_allocation;
GtkWidget *child;
gboolean scrollbars_within_bevel;
gint sb_spacing;
gint sb_width;
gint sb_height;
scrolled_window = GTK_SCROLLED_WINDOW (widget);
bin = GTK_BIN (scrolled_window);
priv = scrolled_window->priv;
if (gtk_widget_get_realized (widget))
{
gdk_window_move_resize (gtk_widget_get_window (widget),
allocation->x, allocation->y,
allocation->width, allocation->height);
}
/* Get possible scrollbar dimensions */
sb_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
gtk_widget_get_preferred_height (priv->hscrollbar, &sb_height, NULL);
gtk_widget_get_preferred_width (priv->vscrollbar, &sb_width, NULL);
context = gtk_widget_get_style_context (widget);
state = gtk_widget_get_state_flags (widget);
gtk_style_context_save (context);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
gtk_style_context_get_padding (context, state, &padding);
gtk_style_context_get_border (context, state, &border);
gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL);
gtk_widget_set_allocation (widget, allocation);
gtk_style_context_restore (context);
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;
child = gtk_bin_get_child (bin);
if (child && gtk_widget_get_visible (child))
{
gint child_scroll_width;
gint child_scroll_height;
GtkScrollablePolicy hscroll_policy;
GtkScrollablePolicy vscroll_policy;
gboolean previous_hvis;
gboolean previous_vvis;
guint count = 0;
hscroll_policy = GTK_IS_SCROLLABLE (child)
? gtk_scrollable_get_hscroll_policy (GTK_SCROLLABLE (child))
: GTK_SCROLL_MINIMUM;
vscroll_policy = GTK_IS_SCROLLABLE (child)
? gtk_scrollable_get_vscroll_policy (GTK_SCROLLABLE (child))
: GTK_SCROLL_MINIMUM;
/* Determine scrollbar visibility first via hfw apis */
if (gtk_widget_get_request_mode (child) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
{
if (hscroll_policy == GTK_SCROLL_MINIMUM)
gtk_widget_get_preferred_width (child, &child_scroll_width, NULL);
else
gtk_widget_get_preferred_width (child, NULL, &child_scroll_width);
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_get_preferred_height_for_width (child,
MAX (allocation->width, child_scroll_width),
&child_scroll_height, NULL);
else
gtk_widget_get_preferred_height_for_width (child,
MAX (allocation->width, child_scroll_width),
NULL, &child_scroll_height);
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* Does the content height fit the allocation height ? */
priv->vscrollbar_visible = child_scroll_height > allocation->height;
/* Does the content width fit the allocation with minus a possible scrollbar ? */
priv->hscrollbar_visible =
child_scroll_width > allocation->width -
(priv->vscrollbar_visible && !priv->touch_mode ? sb_width + sb_spacing : 0);
/* Now that we've guessed the hscrollbar, does the content height fit
* the possible new allocation height ? */
priv->vscrollbar_visible =
child_scroll_height > allocation->height -
(priv->hscrollbar_visible && !priv->touch_mode ? sb_height + sb_spacing : 0);
/* Now that we've guessed the vscrollbar, does the content width fit
* the possible new allocation width ? */
priv->hscrollbar_visible =
child_scroll_width > allocation->width -
(priv->vscrollbar_visible && !priv->touch_mode ? sb_width + sb_spacing : 0);
}
else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->hscrollbar_visible = policy_may_be_visible (priv->hscrollbar_policy);
priv->vscrollbar_visible = child_scroll_height > allocation->height -
(priv->hscrollbar_visible && !priv->touch_mode ? sb_height + sb_spacing : 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 > allocation->width -
(priv->vscrollbar_visible && !priv->touch_mode ? 0 : sb_width + sb_spacing);
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_get_preferred_height (child, &child_scroll_height, NULL);
else
gtk_widget_get_preferred_height (child, NULL, &child_scroll_height);
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_get_preferred_width_for_height (child,
MAX (allocation->height, child_scroll_height),
&child_scroll_width, NULL);
else
gtk_widget_get_preferred_width_for_height (child,
MAX (allocation->height, child_scroll_height),
NULL, &child_scroll_width);
if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
/* Does the content width fit the allocation width ? */
priv->hscrollbar_visible = child_scroll_width > allocation->width;
/* Does the content height fit the allocation with minus a possible scrollbar ? */
priv->vscrollbar_visible =
child_scroll_height > allocation->height -
(priv->hscrollbar_visible && !priv->touch_mode ? sb_height + sb_spacing : 0);
/* Now that we've guessed the vscrollbar, does the content width fit
* the possible new allocation width ? */
priv->hscrollbar_visible =
child_scroll_width > allocation->width -
(priv->vscrollbar_visible && !priv->touch_mode ? sb_width + sb_spacing : 0);
/* Now that we've guessed the hscrollbar, does the content height fit
* the possible new allocation height ? */
priv->vscrollbar_visible =
child_scroll_height > allocation->height -
(priv->hscrollbar_visible && !priv->touch_mode ? sb_height + sb_spacing : 0);
}
else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->vscrollbar_visible = policy_may_be_visible (priv->vscrollbar_policy);
priv->hscrollbar_visible = child_scroll_width > allocation->width -
(priv->vscrollbar_visible && !priv->touch_mode ? sb_width + sb_spacing : 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 > allocation->height -
(priv->hscrollbar_visible && !priv->touch_mode ? sb_height + sb_spacing : 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, &relative_allocation);
/* 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
*/
if (priv->hscrollbar)
gtk_scrolled_window_adjustment_changed
(gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)), scrolled_window);
if (priv->vscrollbar)
gtk_scrolled_window_adjustment_changed
(gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)), scrolled_window);
/* If, after the first iteration, the hscrollbar and the
* vscrollbar flip visiblity... or if one of the scrollbars flip
* on each itteration indefinitly/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, &relative_allocation);
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_scrolled_window_relative_allocation (widget, &relative_allocation);
}
gtk_widget_set_child_visible (priv->hscrollbar, priv->hscrollbar_visible);
if (priv->hscrollbar_visible)
{
child_allocation.x = relative_allocation.x;
if (priv->window_placement == GTK_CORNER_TOP_LEFT ||
priv->window_placement == GTK_CORNER_TOP_RIGHT)
{
if (priv->touch_mode)
child_allocation.y = relative_allocation.y + relative_allocation.height - sb_height;
else
child_allocation.y = relative_allocation.y + relative_allocation.height + sb_spacing;
}
else
{
if (priv->touch_mode)
child_allocation.y = relative_allocation.y;
else
child_allocation.y = relative_allocation.y - sb_spacing - sb_height;
}
child_allocation.width = relative_allocation.width;
child_allocation.height = sb_height;
if (priv->shadow_type != GTK_SHADOW_NONE)
{
if (!scrollbars_within_bevel)
{
child_allocation.x -= padding.left + border.left;
child_allocation.width += padding.left + padding.right + border.left + border.right;
if (priv->window_placement == GTK_CORNER_TOP_LEFT ||
priv->window_placement == GTK_CORNER_TOP_RIGHT)
child_allocation.y += padding.bottom + border.bottom;
else
child_allocation.y -= padding.top + border.top;
}
}
if (priv->hindicator.enabled)
{
gdk_window_move_resize (priv->hindicator.window,
child_allocation.x,
child_allocation.y,
child_allocation.width,
child_allocation.height);
child_allocation.x = 0;
child_allocation.y = 0;
}
gtk_widget_size_allocate (priv->hscrollbar, &child_allocation);
}
gtk_widget_set_child_visible (priv->vscrollbar, priv->vscrollbar_visible);
if (priv->vscrollbar_visible)
{
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->touch_mode)
child_allocation.x = relative_allocation.x + relative_allocation.width - sb_width;
else
child_allocation.x = relative_allocation.x + relative_allocation.width + sb_spacing;
}
else
{
if (priv->touch_mode)
child_allocation.x = relative_allocation.x;
else
child_allocation.x = relative_allocation.x - sb_spacing - sb_width;
}
child_allocation.y = relative_allocation.y;
child_allocation.width = sb_width;
child_allocation.height = relative_allocation.height;
if (priv->shadow_type != GTK_SHADOW_NONE)
{
if (!scrollbars_within_bevel)
{
child_allocation.y -= padding.top + border.top;
child_allocation.height += padding.top + padding.bottom + border.top + border.bottom;
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)))
child_allocation.x += padding.right + border.right;
else
child_allocation.x -= padding.left + border.left;
}
}
if (priv->vindicator.enabled)
{
gdk_window_move_resize (priv->vindicator.window,
child_allocation.x,
child_allocation.y,
child_allocation.width,
child_allocation.height);
child_allocation.x = 0;
child_allocation.y = 0;
}
gtk_widget_size_allocate (priv->vscrollbar, &child_allocation);
}
gtk_scrolled_window_check_attach_pan_gesture (scrolled_window);
}
static gboolean
start_scroll_deceleration_cb (gpointer user_data)
{
GtkScrolledWindow *scrolled_window = user_data;
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
priv->scroll_events_overshoot_id = 0;
gtk_scrolled_window_start_deceleration (scrolled_window);
return FALSE;
}
static gboolean
gtk_scrolled_window_scroll_event (GtkWidget *widget,
GdkEventScroll *event)
{
GtkScrolledWindowPrivate *priv;
GtkScrolledWindow *scrolled_window;
gboolean handled = FALSE;
gdouble delta_x;
gdouble delta_y;
gdouble delta;
scrolled_window = GTK_SCROLLED_WINDOW (widget);
priv = scrolled_window->priv;
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
if (gdk_event_get_scroll_deltas ((GdkEvent *) event, &delta_x, &delta_y))
{
if (delta_x != 0.0 &&
may_hscroll (scrolled_window))
{
GtkAdjustment *adj;
gdouble new_value;
gdouble page_size;
gdouble scroll_unit;
adj = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
page_size = gtk_adjustment_get_page_size (adj);
#ifdef GDK_WINDOWING_QUARTZ
scroll_unit = 1;
#else
scroll_unit = pow (page_size, 2.0 / 3.0);
#endif
new_value = priv->unclamped_hadj_value + delta_x * scroll_unit;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, adj,
new_value);
handled = TRUE;
}
if (delta_y != 0.0 &&
may_vscroll (scrolled_window))
{
GtkAdjustment *adj;
gdouble new_value;
gdouble page_size;
gdouble scroll_unit;
adj = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
page_size = gtk_adjustment_get_page_size (adj);
#ifdef GDK_WINDOWING_QUARTZ
scroll_unit = 1;
#else
scroll_unit = pow (page_size, 2.0 / 3.0);
#endif
new_value = priv->unclamped_vadj_value + delta_y * scroll_unit;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, adj,
new_value);
handled = TRUE;
}
}
else
{
GtkWidget *range;
gboolean may_scroll;
if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
{
range = priv->vscrollbar;
may_scroll = may_vscroll (scrolled_window);
}
else
{
range = priv->hscrollbar;
may_scroll = may_hscroll (scrolled_window);
}
if (range && may_scroll)
{
GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (range));
gdouble new_value;
delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event);
new_value = CLAMP (gtk_adjustment_get_value (adj) + delta,
gtk_adjustment_get_lower (adj),
gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_page_size (adj));
gtk_adjustment_set_value (adj, new_value);
handled = TRUE;
}
}
if (handled)
{
gtk_scrolled_window_cancel_deceleration (scrolled_window);
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
if (priv->scroll_events_overshoot_id)
{
g_source_remove (priv->scroll_events_overshoot_id);
priv->scroll_events_overshoot_id = 0;
}
if (_gtk_scrolled_window_get_overshoot (scrolled_window, NULL, NULL))
{
priv->scroll_events_overshoot_id =
gdk_threads_add_timeout (50, start_scroll_deceleration_cb, scrolled_window);
g_source_set_name_by_id (priv->scroll_events_overshoot_id,
"[gtk+] start_scroll_deceleration_cb");
}
}
return handled;
}
static void
_gtk_scrolled_window_set_adjustment_value (GtkScrolledWindow *scrolled_window,
GtkAdjustment *adjustment,
gdouble value)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
gdouble 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_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
vertical = FALSE;
else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (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)
{
KineticScrollData *data = user_data;
GtkScrolledWindow *scrolled_window = data->scrolled_window;
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkAdjustment *hadjustment, *vadjustment;
gint64 current_time;
gdouble position, elapsed;
current_time = gdk_frame_clock_get_frame_time (frame_clock);
elapsed = (current_time - data->last_deceleration_time) / 1000000.0;
data->last_deceleration_time = current_time;
hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
gtk_scrolled_window_invalidate_overshoot (scrolled_window);
if (data->hscrolling &&
gtk_kinetic_scrolling_tick (data->hscrolling, elapsed, &position))
{
priv->unclamped_hadj_value = position;
gtk_adjustment_set_value (hadjustment, position);
}
else if (data->hscrolling)
g_clear_pointer (&data->hscrolling, (GDestroyNotify) gtk_kinetic_scrolling_free);
if (data->vscrolling &&
gtk_kinetic_scrolling_tick (data->vscrolling, elapsed, &position))
{
priv->unclamped_vadj_value = position;
gtk_adjustment_set_value (vadjustment, position);
}
else if (data->vscrolling)
g_clear_pointer (&data->vscrolling, (GDestroyNotify) gtk_kinetic_scrolling_free);
if (!data->hscrolling && !data->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 = scrolled_window->priv;
if (priv->deceleration_id)
{
gtk_widget_remove_tick_callback (GTK_WIDGET (scrolled_window),
priv->deceleration_id);
priv->deceleration_id = 0;
}
}
static void
kinetic_scroll_data_free (KineticScrollData *data)
{
if (data->hscrolling)
gtk_kinetic_scrolling_free (data->hscrolling);
if (data->vscrolling)
gtk_kinetic_scrolling_free (data->vscrolling);
g_free (data);
}
static void
gtk_scrolled_window_start_deceleration (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GdkFrameClock *frame_clock;
KineticScrollData *data;
g_return_if_fail (priv->deceleration_id == 0);
frame_clock = gtk_widget_get_frame_clock (GTK_WIDGET (scrolled_window));
data = g_new0 (KineticScrollData, 1);
data->scrolled_window = scrolled_window;
data->last_deceleration_time = gdk_frame_clock_get_frame_time (frame_clock);
if (may_hscroll (scrolled_window))
{
gdouble lower,upper;
GtkAdjustment *hadjustment;
hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
lower = gtk_adjustment_get_lower (hadjustment);
upper = gtk_adjustment_get_upper (hadjustment);
upper -= gtk_adjustment_get_page_size (hadjustment);
data->hscrolling =
gtk_kinetic_scrolling_new (lower,
upper,
MAX_OVERSHOOT_DISTANCE,
DECELERATION_FRICTION,
OVERSHOOT_FRICTION,
priv->unclamped_hadj_value,
priv->x_velocity);
}
if (may_vscroll (scrolled_window))
{
gdouble lower,upper;
GtkAdjustment *vadjustment;
vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
lower = gtk_adjustment_get_lower(vadjustment);
upper = gtk_adjustment_get_upper(vadjustment);
upper -= gtk_adjustment_get_page_size(vadjustment);
data->vscrolling =
gtk_kinetic_scrolling_new (lower,
upper,
MAX_OVERSHOOT_DISTANCE,
DECELERATION_FRICTION,
OVERSHOOT_FRICTION,
priv->unclamped_vadj_value,
priv->y_velocity);
}
scrolled_window->priv->deceleration_id =
gtk_widget_add_tick_callback (GTK_WIDGET (scrolled_window),
scrolled_window_deceleration_cb, data,
(GDestroyNotify) kinetic_scroll_data_free);
}
static gboolean
gtk_scrolled_window_focus (GtkWidget *widget,
GtkDirectionType direction)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkWidget *child;
gboolean had_focus_child;
had_focus_child = gtk_container_get_focus_child (GTK_CONTAINER (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.
*/
child = gtk_bin_get_child (GTK_BIN (widget));
if (child)
{
if (gtk_widget_child_focus (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)
{
GtkScrolledWindowPrivate *priv;
GtkScrolledWindow *scrolled_window;
scrolled_window = GTK_SCROLLED_WINDOW (data);
priv = scrolled_window->priv;
if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
{
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;
visible = priv->hscrollbar_visible;
priv->hscrollbar_visible = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment) >
gtk_adjustment_get_page_size (adjustment));
if (priv->hscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)))
{
if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
{
gboolean visible;
visible = priv->vscrollbar_visible;
priv->vscrollbar_visible = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment) >
gtk_adjustment_get_page_size (adjustment));
if (priv->vscrollbar_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
}
static void
gtk_scrolled_window_adjustment_value_changed (GtkAdjustment *adjustment,
gpointer user_data)
{
GtkScrolledWindow *scrolled_window = user_data;
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
/* Allow overshooting for kinetic scrolling operations */
if (priv->drag_device || priv->deceleration_id)
return;
/* Ensure GtkAdjustment and unclamped values are in sync */
if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
priv->unclamped_hadj_value = gtk_adjustment_get_value (adjustment);
else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)))
priv->unclamped_vadj_value = gtk_adjustment_get_value (adjustment);
}
static void
gtk_scrolled_window_add (GtkContainer *container,
GtkWidget *child)
{
GtkScrolledWindowPrivate *priv;
GtkScrolledWindow *scrolled_window;
GtkBin *bin;
GtkWidget *child_widget, *scrollable_child;
GtkAdjustment *hadj, *vadj;
bin = GTK_BIN (container);
child_widget = gtk_bin_get_child (bin);
g_return_if_fail (child_widget == NULL);
scrolled_window = GTK_SCROLLED_WINDOW (container);
priv = scrolled_window->priv;
/* 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_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
vadj = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
if (GTK_IS_SCROLLABLE (child))
{
scrollable_child = child;
}
else
{
scrollable_child = gtk_viewport_new (hadj, vadj);
gtk_widget_show (scrollable_child);
gtk_container_set_focus_hadjustment (GTK_CONTAINER (scrollable_child),
gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (scrolled_window)));
gtk_container_set_focus_vadjustment (GTK_CONTAINER (scrollable_child),
gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (scrolled_window)));
gtk_container_add (GTK_CONTAINER (scrollable_child), child);
}
_gtk_bin_set_child (bin, scrollable_child);
gtk_widget_set_parent (scrollable_child, GTK_WIDGET (bin));
g_object_set (scrollable_child, "hadjustment", hadj, "vadjustment", vadj, NULL);
}
static void
gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *child)
{
g_object_set (child, "hadjustment", NULL, "vadjustment", NULL, NULL);
GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child);
}
/**
* gtk_scrolled_window_add_with_viewport:
* @scrolled_window: a #GtkScrolledWindow
* @child: the widget you want to scroll
*
* Used to add children without native scrolling capabilities. This
* is simply a convenience function; it is equivalent to adding the
* unscrollable child to a viewport, then adding the viewport to the
* scrolled window. If a child has native scrolling, use
* gtk_container_add() instead of this function.
*
* The viewport scrolls the child by moving its #GdkWindow, and takes
* the size of the child to be the size of its toplevel #GdkWindow.
* This will be very wrong for most widgets that support native scrolling;
* for example, if you add a widget such as #GtkTreeView with a viewport,
* the whole widget will scroll, including the column headings. Thus,
* widgets with native scrolling support should not be used with the
* #GtkViewport proxy.
*
* A widget supports scrolling natively if it implements the
* #GtkScrollable interface.
*
* Deprecated: 3.8: gtk_container_add() will automatically add
* a #GtkViewport if the child doesn’t implement #GtkScrollable.
*/
void
gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,
GtkWidget *child)
{
GtkBin *bin;
GtkWidget *viewport;
GtkWidget *child_widget;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (gtk_widget_get_parent (child) == NULL);
bin = GTK_BIN (scrolled_window);
child_widget = gtk_bin_get_child (bin);
if (child_widget)
{
g_return_if_fail (GTK_IS_VIEWPORT (child_widget));
g_return_if_fail (gtk_bin_get_child (GTK_BIN (child_widget)) == NULL);
viewport = child_widget;
}
else
{
viewport =
gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window),
gtk_scrolled_window_get_vadjustment (scrolled_window));
gtk_container_set_focus_hadjustment (GTK_CONTAINER (viewport),
gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (scrolled_window)));
gtk_container_set_focus_vadjustment (GTK_CONTAINER (viewport),
gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (scrolled_window)));
gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
}
gtk_widget_show (viewport);
gtk_container_add (GTK_CONTAINER (viewport), child);
}
/*
* _gtk_scrolled_window_get_spacing:
* @scrolled_window: a scrolled window
*
* Gets the spacing between the scrolled window’s scrollbars and
* the scrolled widget. Used by GtkCombo
*
* Returns: the spacing, in pixels.
*/
static gint
_gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowClass *class;
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window);
if (class->scrollbar_spacing >= 0)
return class->scrollbar_spacing;
else
{
gint scrollbar_spacing;
gtk_widget_style_get (GTK_WIDGET (scrolled_window),
"scrollbar-spacing", &scrollbar_spacing,
NULL);
return scrollbar_spacing;
}
}
static void
gtk_scrolled_window_get_preferred_size (GtkWidget *widget,
GtkOrientation orientation,
gint *minimum_size,
gint *natural_size)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkBin *bin = GTK_BIN (scrolled_window);
gint extra_width;
gint extra_height;
gint scrollbar_spacing;
GtkRequisition hscrollbar_requisition;
GtkRequisition vscrollbar_requisition;
GtkRequisition minimum_req, natural_req;
GtkWidget *child;
gint min_child_size, nat_child_size;
scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window);
extra_width = 0;
extra_height = 0;
minimum_req.width = 0;
minimum_req.height = 0;
natural_req.width = 0;
natural_req.height = 0;
gtk_widget_get_preferred_size (priv->hscrollbar,
&hscrollbar_requisition, NULL);
gtk_widget_get_preferred_size (priv->vscrollbar,
&vscrollbar_requisition, NULL);
child = gtk_bin_get_child (bin);
if (child && gtk_widget_get_visible (child))
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
gtk_widget_get_preferred_width (child,
&min_child_size,
&nat_child_size);
if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
{
minimum_req.width += min_child_size;
natural_req.width += nat_child_size;
}
else
{
gint min_content_width = priv->min_content_width;
if (min_content_width >= 0)
{
minimum_req.width = MAX (minimum_req.width, min_content_width);
natural_req.width = MAX (natural_req.width, min_content_width);
extra_width = -1;
}
else if (policy_may_be_visible (priv->vscrollbar_policy))
{
minimum_req.width += vscrollbar_requisition.width;
natural_req.width += vscrollbar_requisition.width;
}
}
}
else /* GTK_ORIENTATION_VERTICAL */
{
gtk_widget_get_preferred_height (child,
&min_child_size,
&nat_child_size);
if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
{
minimum_req.height += min_child_size;
natural_req.height += nat_child_size;
}
else
{
gint min_content_height = priv->min_content_height;
if (min_content_height >= 0)
{
minimum_req.height = MAX (minimum_req.height, min_content_height);
natural_req.height = MAX (natural_req.height, min_content_height);
extra_height = -1;
}
else if (policy_may_be_visible (priv->vscrollbar_policy))
{
minimum_req.height += vscrollbar_requisition.height;
natural_req.height += vscrollbar_requisition.height;
}
}
}
}
if (policy_may_be_visible (priv->hscrollbar_policy) && !priv->touch_mode)
{
minimum_req.width = MAX (minimum_req.width, hscrollbar_requisition.width);
natural_req.width = MAX (natural_req.width, hscrollbar_requisition.width);
if (!extra_height || priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
extra_height = scrollbar_spacing + hscrollbar_requisition.height;
}
if (policy_may_be_visible (priv->vscrollbar_policy) && !priv->touch_mode)
{
minimum_req.height = MAX (minimum_req.height, vscrollbar_requisition.height);
natural_req.height = MAX (natural_req.height, vscrollbar_requisition.height);
if (!extra_width || priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
extra_width = scrollbar_spacing + vscrollbar_requisition.width;
}
minimum_req.width += MAX (0, extra_width);
minimum_req.height += MAX (0, extra_height);
natural_req.width += MAX (0, extra_width);
natural_req.height += MAX (0, extra_height);
if (priv->shadow_type != GTK_SHADOW_NONE)
{
GtkStyleContext *context;
GtkStateFlags state;
GtkBorder padding, border;
context = gtk_widget_get_style_context (GTK_WIDGET (widget));
state = gtk_widget_get_state_flags (GTK_WIDGET (widget));
gtk_style_context_save (context);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
gtk_style_context_get_padding (context, state, &padding);
gtk_style_context_get_border (context, state, &border);
minimum_req.width += padding.left + padding.right + border.left + border.right;
minimum_req.height += padding.top + padding.bottom + border.top + border.bottom;
natural_req.width += padding.left + padding.right + border.left + border.right;
natural_req.height += padding.top + padding.bottom + border.top + border.bottom;
gtk_style_context_restore (context);
}
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
*minimum_size = minimum_req.width;
*natural_size = natural_req.width;
}
else
{
*minimum_size = minimum_req.height;
*natural_size = natural_req.height;
}
}
static void
gtk_scrolled_window_get_preferred_width (GtkWidget *widget,
gint *minimum_size,
gint *natural_size)
{
gtk_scrolled_window_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
}
static void
gtk_scrolled_window_get_preferred_height (GtkWidget *widget,
gint *minimum_size,
gint *natural_size)
{
gtk_scrolled_window_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
}
static void
gtk_scrolled_window_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height)
{
GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, minimum_height, natural_height);
}
static void
gtk_scrolled_window_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum_width,
gint *natural_width)
{
GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, minimum_width, natural_width);
}
static gboolean
gtk_scrolled_window_should_animate (GtkScrolledWindow *sw)
{
gboolean animate;
if (!gtk_widget_get_mapped (GTK_WIDGET (sw)))
return FALSE;
g_object_get (gtk_widget_get_settings (GTK_WIDGET (sw)),
"gtk-enable-animations", &animate,
NULL);
return animate;
}
static void
gtk_scrolled_window_update_animating (GtkScrolledWindow *sw)
{
GtkAdjustment *adjustment;
GdkFrameClock *clock = NULL;
guint duration = 0;
if (gtk_scrolled_window_should_animate (sw))
{
clock = gtk_widget_get_frame_clock (GTK_WIDGET (sw)),
duration = ANIMATION_DURATION;
}
adjustment = gtk_range_get_adjustment (GTK_RANGE (sw->priv->hscrollbar));
gtk_adjustment_enable_animation (adjustment, clock, duration);
adjustment = gtk_range_get_adjustment (GTK_RANGE (sw->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);
}
static void
gtk_scrolled_window_unmap (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->unmap (widget);
gtk_scrolled_window_update_animating (scrolled_window);
indicator_stop_fade (&scrolled_window->priv->hindicator);
indicator_stop_fade (&scrolled_window->priv->vindicator);
}
static GdkWindow *
create_indicator_window (GtkScrolledWindow *scrolled_window,
GtkWidget *child)
{
GtkWidget *widget = GTK_WIDGET (scrolled_window);
GdkRGBA transparent = { 0, 0, 0, 0 };
GtkAllocation allocation;
GdkWindow *window;
GdkWindowAttr attributes;
gint attributes_mask;
gtk_widget_get_allocation (child, &allocation);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.visual = gtk_widget_get_visual (widget);
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
window = gdk_window_new (gtk_widget_get_window (widget),
&attributes, attributes_mask);
gtk_widget_register_window (widget, window);
gdk_window_set_background_rgba (window, &transparent);
if (scrolled_window->priv->touch_mode)
gtk_widget_set_parent_window (child, window);
return window;
}
static void
indicator_set_fade (Indicator *indicator,
gdouble 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 && !gdk_window_is_visible (indicator->window))
{
gdk_window_show (indicator->window);
indicator->conceil_timer = g_timeout_add (INDICATOR_FADE_OUT_TIME, maybe_hide_indicator, indicator);
}
if (!visible && gdk_window_is_visible (indicator->window))
{
gdk_window_hide (indicator->window);
g_source_remove (indicator->conceil_timer);
indicator->conceil_timer = 0;
}
if (changed)
{
gtk_widget_set_opacity (indicator->scrollbar, indicator->current_pos);
gtk_widget_queue_draw (indicator->scrollbar);
}
}
static double
ease_out_cubic (double t)
{
double p = t - 1;
return p * p * p + 1;
}
static void
indicator_fade_step (Indicator *indicator,
gint64 now)
{
gdouble t;
if (now < indicator->end_time)
t = (now - indicator->start_time) / (gdouble) (indicator->end_time - indicator->start_time);
else
t = 1.0;
t = ease_out_cubic (t);
indicator_set_fade (indicator,
indicator->source_pos + (t * (indicator->target_pos - indicator->source_pos)));
}
static gboolean
indicator_fade_cb (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer user_data)
{
Indicator *indicator = user_data;
gint64 now;
now = gdk_frame_clock_get_frame_time (frame_clock);
indicator_fade_step (indicator, now);
if (indicator->current_pos == indicator->target_pos)
{
indicator->tick_id = 0;
return FALSE;
}
return TRUE;
}
static void
indicator_start_fade (Indicator *indicator,
gdouble target)
{
gboolean animations_enabled;
if (indicator->target_pos == target)
return;
indicator->target_pos = target;
g_object_get (gtk_widget_get_settings (indicator->scrollbar),
"gtk-enable-animations", &animations_enabled,
NULL);
if (target != 0.0)
indicator->last_scroll_time = g_get_monotonic_time ();
if (gtk_widget_get_mapped (indicator->scrollbar) && animations_enabled)
{
indicator->source_pos = indicator->current_pos;
indicator->start_time = gdk_frame_clock_get_frame_time (gtk_widget_get_frame_clock (indicator->scrollbar));
indicator->end_time = indicator->start_time + INDICATOR_FADE_OUT_DURATION * 1000;
if (indicator->tick_id == 0)
indicator->tick_id = gtk_widget_add_tick_callback (indicator->scrollbar, indicator_fade_cb, indicator, NULL);
indicator_fade_step (indicator, indicator->start_time);
}
else
indicator_set_fade (indicator, target);
}
static void
indicator_stop_fade (Indicator *indicator)
{
if (indicator->tick_id != 0)
{
indicator_set_fade (indicator, indicator->target_pos);
gtk_widget_remove_tick_callback (indicator->scrollbar, indicator->tick_id);
indicator->tick_id = 0;
}
}
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->enabled && !indicator->over && !indicator->dragging)
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 ();
if (indicator->enabled)
indicator_start_fade (indicator, 1.0);
}
static void
indicator_style_changed (GtkStyleContext *context,
Indicator *indicator)
{
if (gtk_style_context_has_class (context, "dragging"))
indicator->dragging = TRUE;
else
indicator->dragging = FALSE;
}
static void
setup_indicator (GtkScrolledWindow *scrolled_window,
Indicator *indicator,
GtkWidget *scrollbar)
{
GtkStyleContext *context;
GtkAdjustment *adjustment;
if (scrollbar == NULL)
return;
context = gtk_widget_get_style_context (scrollbar);
adjustment = gtk_range_get_adjustment (GTK_RANGE (scrollbar));
indicator->enabled = TRUE;
indicator->scrollbar = scrollbar;
g_object_ref (scrollbar);
gtk_widget_unparent (scrollbar);
gtk_widget_set_parent_window (scrollbar, indicator->window);
gtk_widget_set_parent (scrollbar, GTK_WIDGET (scrolled_window));
g_object_unref (scrollbar);
gtk_style_context_add_class (context, "overlay-indicator");
g_signal_connect (context, "changed",
G_CALLBACK (indicator_style_changed), indicator);
g_signal_connect (adjustment, "value-changed",
G_CALLBACK (indicator_value_changed), indicator);
gdk_window_hide (indicator->window);
gtk_widget_set_opacity (scrollbar, 0.0);
indicator->current_pos = 0.0;
}
static void
remove_indicator (GtkScrolledWindow *scrolled_window,
Indicator *indicator)
{
GtkWidget *scrollbar;
GtkStyleContext *context;
GtkAdjustment *adjustment;
if (indicator->scrollbar == NULL)
return;
scrollbar = indicator->scrollbar;
indicator->scrollbar = NULL;
context = gtk_widget_get_style_context (scrollbar);
adjustment = gtk_range_get_adjustment (GTK_RANGE (scrollbar));
gtk_style_context_remove_class (context, "overlay-indicator");
g_signal_handlers_disconnect_by_func (context, indicator_style_changed, indicator);
g_signal_handlers_disconnect_by_func (adjustment, indicator_value_changed, indicator);
indicator->enabled = FALSE;
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;
}
g_object_ref (scrollbar);
gtk_widget_unparent (scrollbar);
gtk_widget_set_parent (scrollbar, GTK_WIDGET (scrolled_window));
g_object_unref (scrollbar);
if (indicator->window)
gdk_window_hide (indicator->window);
gtk_widget_set_opacity (scrollbar, 1.0);
indicator->current_pos = 1.0;
}
static gboolean
device_manager_has_mouse (GdkDeviceManager *dm)
{
GdkDevice *cp;
GList *slaves, *s;
GdkDevice *device;
gboolean found;
found = FALSE;
cp = gdk_device_manager_get_client_pointer (dm);
slaves = gdk_device_list_slave_devices (cp);
for (s = slaves; s; s = s->next)
{
device = s->data;
if (gdk_device_get_source (device) != GDK_SOURCE_MOUSE)
continue;
if (strstr (gdk_device_get_name (device), "XTEST"))
continue;
if (strstr (gdk_device_get_name (device), "TrackPoint"))
continue;
if (g_object_get_data (G_OBJECT (device), "removed"))
continue;
found = TRUE;
break;
}
g_list_free (slaves);
return found;
}
static void
gtk_scrolled_window_update_touch_mode (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
gboolean touch_mode;
const gchar *env_overlay_scrolling;
const gchar *env_test_touchscreen;
env_overlay_scrolling = g_getenv ("GTK_OVERLAY_SCROLLING");
env_test_touchscreen = g_getenv ("GTK_TEST_TOUCHSCREEN");
if (!priv->overlay_scrolling || g_strcmp0 (env_overlay_scrolling, "0") == 0)
touch_mode = FALSE;
else if ((gtk_get_debug_flags () & GTK_DEBUG_TOUCHSCREEN) != 0 ||
env_test_touchscreen != NULL ||
g_strcmp0 (env_overlay_scrolling, "1") == 0)
touch_mode = TRUE;
else
{
GdkDeviceManager *dm;
dm = gdk_display_get_device_manager (gtk_widget_get_display (GTK_WIDGET (scrolled_window)));
touch_mode = !device_manager_has_mouse (dm);
}
if (priv->touch_mode != touch_mode)
{
priv->touch_mode = touch_mode;
if (priv->touch_mode)
{
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);
}
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
}
static void
gtk_scrolled_window_device_added (GdkDeviceManager *dm,
GdkDevice *device,
GtkScrolledWindow *scrolled_window)
{
gtk_scrolled_window_update_touch_mode (scrolled_window);
}
static void
gtk_scrolled_window_device_removed (GdkDeviceManager *dm,
GdkDevice *device,
GtkScrolledWindow *scrolled_window)
{
/* Work around the fact that ::device-removed is emitted
* before the device is removed from the list.
*/
g_object_set_data (G_OBJECT (device), "removed", GINT_TO_POINTER (1));
gtk_scrolled_window_update_touch_mode (scrolled_window);
}
static void
gtk_scrolled_window_realize (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GdkDeviceManager *dm;
GdkWindow *window;
GtkAllocation allocation;
GdkWindowAttr attributes;
gint attributes_mask;
gtk_widget_get_allocation (widget, &allocation);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.visual = gtk_widget_get_visual (widget);
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK |
GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK;
window = gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask);
gtk_widget_set_window (widget, window);
gtk_widget_register_window (widget, window);
gtk_widget_set_realized (widget, TRUE);
priv->hindicator.window = create_indicator_window (scrolled_window, priv->hscrollbar);
priv->vindicator.window = create_indicator_window (scrolled_window, priv->vscrollbar);
priv->hindicator.scrollbar = priv->hscrollbar;
priv->vindicator.scrollbar = priv->vscrollbar;
gtk_scrolled_window_update_touch_mode (scrolled_window);
dm = gdk_display_get_device_manager (gtk_widget_get_display (widget));
g_signal_connect (dm, "device-added",
G_CALLBACK (gtk_scrolled_window_device_added), scrolled_window);
g_signal_connect (dm, "device-removed",
G_CALLBACK (gtk_scrolled_window_device_removed), scrolled_window);
}
static void
gtk_scrolled_window_unrealize (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GdkDeviceManager *dm;
dm = gdk_display_get_device_manager (gtk_widget_get_display (widget));
g_signal_handlers_disconnect_by_func (dm, gtk_scrolled_window_device_added, scrolled_window);
g_signal_handlers_disconnect_by_func (dm, gtk_scrolled_window_device_removed, scrolled_window);
gtk_widget_set_parent_window (priv->hscrollbar, NULL);
gtk_widget_unregister_window (widget, priv->hindicator.window);
gdk_window_destroy (priv->hindicator.window);
priv->hindicator.window = NULL;
gtk_widget_set_parent_window (priv->vscrollbar, NULL);
gtk_widget_unregister_window (widget, priv->vindicator.window);
gdk_window_destroy (priv->vindicator.window);
priv->vindicator.window = NULL;
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->unrealize (widget);
}
static void
gtk_scrolled_window_grab_notify (GtkWidget *widget,
gboolean was_grabbed)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
if (priv->drag_device &&
gtk_widget_device_is_shadowed (widget,
priv->drag_device))
{
gdk_device_ungrab (priv->drag_device,
gtk_get_current_event_time ());
priv->drag_device = NULL;
if (_gtk_scrolled_window_get_overshoot (scrolled_window, NULL, NULL))
gtk_scrolled_window_start_deceleration (scrolled_window);
else
gtk_scrolled_window_cancel_deceleration (scrolled_window);
}
}
/**
* 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
*
* Since: 3.0
*/
gint
gtk_scrolled_window_get_min_content_width (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
return scrolled_window->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.
*
* Since: 3.0
*/
void
gtk_scrolled_window_set_min_content_width (GtkScrolledWindow *scrolled_window,
gint width)
{
GtkScrolledWindowPrivate *priv;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
priv = scrolled_window->priv;
if (priv->min_content_width != width)
{
priv->min_content_width = width;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify (G_OBJECT (scrolled_window), "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
*
* Since: 3.0
*/
gint
gtk_scrolled_window_get_min_content_height (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0);
return scrolled_window->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.
*
* Since: 3.0
*/
void
gtk_scrolled_window_set_min_content_height (GtkScrolledWindow *scrolled_window,
gint height)
{
GtkScrolledWindowPrivate *priv;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
priv = scrolled_window->priv;
if (priv->min_content_height != height)
{
priv->min_content_height = height;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify (G_OBJECT (scrolled_window), "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.
*
* Since: 3.16
*/
void
gtk_scrolled_window_set_overlay_scrolling (GtkScrolledWindow *scrolled_window,
gboolean overlay_scrolling)
{
GtkScrolledWindowPrivate *priv;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
priv = scrolled_window->priv;
if (priv->overlay_scrolling != overlay_scrolling)
{
priv->overlay_scrolling = overlay_scrolling;
if (gtk_widget_get_realized (GTK_WIDGET (scrolled_window)))
gtk_scrolled_window_update_touch_mode (scrolled_window);
g_object_notify (G_OBJECT (scrolled_window), "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
*
* Since: 3.16
*/
gboolean
gtk_scrolled_window_get_overlay_scrolling (GtkScrolledWindow *scrolled_window)
{
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), TRUE);
return scrolled_window->priv->overlay_scrolling;
}
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