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gtk2/gtk/gtkscrolledwindow.c
Benjamin Otte cba4156ef6 scrolledwindow: Use child-visible instead of visible for scrollbars 
We want to reserve space for the size of the scrollbars even when they
are not visible. And because toggling visibile to off now returns 0 for
size requests, this won't work anymore.
2013-01-14 18:13:10 +01:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkscrolledwindow.h"
#include "gtkadjustment.h"
#include "gtkbindings.h"
#include "gtkdnd.h"
#include "gtkintl.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtkscrollable.h"
#include "gtkscrollbar.h"
#include "gtktypebuiltins.h"
#include "gtkviewport.h"
#include "gtkwidgetprivate.h"
#include "gtkwindow.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. The convenience function
* gtk_scrolled_window_add_with_viewport() does exactly this, 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.
*/
/* 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 FRAME_INTERVAL (1000 / 60)
#define MAX_OVERSHOOT_DISTANCE 50
#define FRICTION_DECELERATION 0.003
#define OVERSHOOT_INVERSE_ACCELERATION 0.003
#define RELEASE_EVENT_TIMEOUT 1000
struct _GtkScrolledWindowPrivate
{
GtkWidget *hscrollbar;
GtkWidget *vscrollbar;
GtkCornerType real_window_placement;
guint16 shadow_type;
guint window_placement_set : 1;
guint hscrollbar_policy : 2;
guint vscrollbar_policy : 2;
guint hscrollbar_visible : 1;
guint vscrollbar_visible : 1;
guint window_placement : 2;
guint focus_out : 1; /* Flag used by ::move-focus-out implementation */
gint min_content_width;
gint min_content_height;
/* Kinetic scrolling */
GdkEvent *button_press_event;
GdkWindow *overshoot_window;
GdkDevice *drag_device;
guint kinetic_scrolling : 1;
guint capture_button_press : 1;
guint in_drag : 1;
guint last_button_event_valid : 1;
guint release_timeout_id;
guint deceleration_id;
gdouble last_button_event_x_root;
gdouble last_button_event_y_root;
gdouble last_motion_event_x_root;
gdouble last_motion_event_y_root;
guint32 last_motion_event_time;
gdouble x_velocity;
gdouble y_velocity;
gdouble unclamped_hadj_value;
gdouble unclamped_vadj_value;
};
typedef struct
{
GtkScrolledWindow *scrolled_window;
gint64 last_deceleration_time;
gdouble x_velocity;
gdouble y_velocity;
gdouble vel_cosine;
gdouble vel_sine;
} 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
};
/* Signals */
enum
{
SCROLL_CHILD,
MOVE_FOCUS_OUT,
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 void gtk_scrolled_window_screen_changed (GtkWidget *widget,
GdkScreen *previous_screen);
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_captured_event (GtkWidget *widget,
GdkEvent *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 void gtk_scrolled_window_update_real_placement (GtkScrolledWindow *scrolled_window);
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_realize (GtkWidget *widget);
static void gtk_scrolled_window_unrealize (GtkWidget *widget);
static void gtk_scrolled_window_map (GtkWidget *widget);
static void gtk_scrolled_window_unmap (GtkWidget *widget);
static void gtk_scrolled_window_grab_notify (GtkWidget *widget,
gboolean was_grabbed);
static gboolean _gtk_scrolled_window_set_adjustment_value (GtkScrolledWindow *scrolled_window,
GtkAdjustment *adjustment,
gdouble value,
gboolean allow_overshooting,
gboolean snap_to_border);
static guint signals[LAST_SIGNAL] = {0};
G_DEFINE_TYPE (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 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->screen_changed = gtk_scrolled_window_screen_changed;
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->realize = gtk_scrolled_window_realize;
widget_class->unrealize = gtk_scrolled_window_unrealize;
widget_class->map = gtk_scrolled_window_map;
widget_class->unmap = gtk_scrolled_window_unmap;
widget_class->grab_notify = gtk_scrolled_window_grab_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_READABLE | GTK_PARAM_WRITABLE));
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_READABLE | GTK_PARAM_WRITABLE));
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. This property only takes effect if \"window-placement-set\" is TRUE."),
GTK_TYPE_CORNER_TYPE,
GTK_CORNER_TOP_LEFT,
GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
/**
* GtkScrolledWindow:window-placement-set:
*
* Whether "window-placement" should be used to determine the location
* of the contents with respect to the scrollbars. Otherwise, the
* "gtk-scrolled-window-placement" setting is used.
*
* Since: 2.10
*/
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."),
FALSE,
GTK_PARAM_READABLE | GTK_PARAM_WRITABLE));
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_READABLE | GTK_PARAM_WRITABLE));
/**
* 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));
/**
* 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));
/**
* GtkScrolledWindow:kinetic-scrolling:
*
* The kinetic scrolling behavior flags. 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_READABLE |
GTK_PARAM_WRITABLE));
/**
* 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
* <link linkend="keybinding-signals">keybinding signal</link>
* 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
* <link linkend="keybinding-signals">keybinding signal</link>
* 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
* <keycombo><keycap>Tab</keycap><keycap>Ctrl</keycap></keycombo>
* and
* <keycombo><keycap>Tab</keycap><keycap>Ctrl</keycap><keycap>Shift</keycap></keycombo>.
*/
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);
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);
g_type_class_add_private (class, sizeof (GtkScrolledWindowPrivate));
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_SCROLLED_WINDOW_ACCESSIBLE);
}
static void
gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv;
scrolled_window->priv = priv = G_TYPE_INSTANCE_GET_PRIVATE (scrolled_window,
GTK_TYPE_SCROLLED_WINDOW,
GtkScrolledWindowPrivate);
gtk_widget_set_has_window (GTK_WIDGET (scrolled_window), FALSE);
gtk_widget_set_can_focus (GTK_WIDGET (scrolled_window), TRUE);
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;
gtk_scrolled_window_update_real_placement (scrolled_window);
priv->min_content_width = -1;
priv->min_content_height = -1;
gtk_scrolled_window_set_kinetic_scrolling (scrolled_window, TRUE);
gtk_scrolled_window_set_capture_button_press (scrolled_window, TRUE);
}
/**
* 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)
{
gtk_widget_push_composite_child ();
priv->hscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_HORIZONTAL, hadjustment);
gtk_widget_set_composite_name (priv->hscrollbar, "hscrollbar");
gtk_widget_pop_composite_child ();
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_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);
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)
{
gtk_widget_push_composite_child ();
priv->vscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, vadjustment);
gtk_widget_set_composite_name (priv->vscrollbar, "vscrollbar");
gtk_widget_pop_composite_child ();
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_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);
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 (priv->hscrollbar ?
gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)) :
NULL);
}
/**
* 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 (priv->vscrollbar ?
gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)) :
NULL);
}
/**
* 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,
* or %NULL if it does not have one.
*
* 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,
* or %NULL if it does not have one.
*
* 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_update_real_placement (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkSettings *settings;
settings = gtk_widget_get_settings (GTK_WIDGET (scrolled_window));
if (priv->window_placement_set || settings == NULL)
priv->real_window_placement = priv->window_placement;
else
g_object_get (settings,
"gtk-scrolled-window-placement",
&priv->real_window_placement,
NULL);
}
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_scrolled_window_update_real_placement (scrolled_window);
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify (G_OBJECT (scrolled_window), "window-placement");
}
}
static void
gtk_scrolled_window_set_placement_set (GtkScrolledWindow *scrolled_window,
gboolean placement_set,
gboolean emit_resize)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
if (priv->window_placement_set != placement_set)
{
priv->window_placement_set = placement_set;
gtk_scrolled_window_update_real_placement (scrolled_window);
if (emit_resize)
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
}
}
/**
* 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_set (scrolled_window, TRUE, FALSE);
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().
*
* Return value: 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 obeys the "gtk-scrolled-window-placement" XSETTING.
*
* 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)
{
GtkScrolledWindowPrivate *priv;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
priv = scrolled_window->priv;
if (priv->window_placement_set)
{
priv->window_placement_set = FALSE;
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
g_object_notify (G_OBJECT (scrolled_window), "window-placement-set");
}
}
/**
* 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;
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;
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().
*
* Return value: 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)
{
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;
if (priv->kinetic_scrolling)
{
_gtk_widget_set_captured_event_handler (GTK_WIDGET (scrolled_window),
gtk_scrolled_window_captured_event);
}
else
{
_gtk_widget_set_captured_event_handler (GTK_WIDGET (scrolled_window), NULL);
if (priv->release_timeout_id)
{
g_source_remove (priv->release_timeout_id);
priv->release_timeout_id = 0;
}
if (priv->deceleration_id)
{
g_source_remove (priv->deceleration_id);
priv->deceleration_id = 0;
}
}
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.
*
* Return value: 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;
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->release_timeout_id)
{
g_source_remove (priv->release_timeout_id);
priv->release_timeout_id = 0;
}
if (priv->deceleration_id)
{
g_source_remove (priv->deceleration_id);
priv->deceleration_id = 0;
}
if (priv->button_press_event)
{
gdk_event_free (priv->button_press_event);
priv->button_press_event = NULL;
}
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:
gtk_scrolled_window_set_placement_set (scrolled_window,
g_value_get_boolean (value),
TRUE);
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;
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, priv->window_placement_set);
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;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
traverse_container (GtkWidget *widget,
gpointer data)
{
if (GTK_IS_SCROLLED_WINDOW (widget))
{
gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
gtk_widget_queue_resize (widget);
}
else if (GTK_IS_CONTAINER (widget))
gtk_container_forall (GTK_CONTAINER (widget), traverse_container, NULL);
}
static void
gtk_scrolled_window_settings_changed (GtkSettings *settings)
{
GList *list, *l;
list = gtk_window_list_toplevels ();
for (l = list; l; l = l->next)
gtk_container_forall (GTK_CONTAINER (l->data),
traverse_container, NULL);
g_list_free (list);
}
static void
gtk_scrolled_window_screen_changed (GtkWidget *widget,
GdkScreen *previous_screen)
{
GtkSettings *settings;
guint window_placement_connection;
gtk_scrolled_window_update_real_placement (GTK_SCROLLED_WINDOW (widget));
if (!gtk_widget_has_screen (widget))
return;
settings = gtk_widget_get_settings (widget);
window_placement_connection =
GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (settings),
"gtk-scrolled-window-connection"));
if (window_placement_connection)
return;
window_placement_connection =
g_signal_connect (settings, "notify::gtk-scrolled-window-placement",
G_CALLBACK (gtk_scrolled_window_settings_changed), NULL);
g_object_set_data (G_OBJECT (settings),
I_("gtk-scrolled-window-connection"),
GUINT_TO_POINTER (window_placement_connection));
}
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 wid_allocation, 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 (widget, &wid_allocation);
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_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_style_context_restore (context);
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->real_window_placement == GTK_CORNER_TOP_RIGHT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(!is_rtl &&
(priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
junction_rect.x += hscr_allocation.width;
if (priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_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 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;
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);
if (priv->shadow_type != GTK_SHADOW_NONE)
{
gboolean scrollbars_within_bevel;
gtk_style_context_save (context);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
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_style_context_restore (context);
}
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->draw (widget, cr);
return FALSE;
}
static void
gtk_scrolled_window_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
GtkScrolledWindowPrivate *priv;
GtkScrolledWindow *scrolled_window;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
g_return_if_fail (callback != NULL);
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 && (!priv->hscrollbar || !priv->hscrollbar_visible)) ||
(!horizontal && (!priv->vscrollbar || !priv->vscrollbar_visible)))
return FALSE;
if (horizontal)
{
if (priv->hscrollbar)
adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
}
else
{
if (priv->vscrollbar)
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_set_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)
{
gboolean is_rtl;
is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
if ((!is_rtl &&
(priv->real_window_placement == GTK_CORNER_TOP_RIGHT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(is_rtl &&
(priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_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)
{
if (priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT ||
priv->real_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_overshoot_window (GtkScrolledWindow *scrolled_window)
{
GtkAllocation window_allocation, relative_allocation, allocation;
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkWidget *widget = GTK_WIDGET (scrolled_window);
gint overshoot_x, overshoot_y;
if (!gtk_widget_get_realized (widget))
return;
gtk_widget_get_allocation (widget, &allocation);
gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
_gtk_scrolled_window_get_overshoot (scrolled_window,
&overshoot_x, &overshoot_y);
window_allocation = relative_allocation;
window_allocation.x += allocation.x;
window_allocation.y += allocation.y;
/* Handle displacement to the left/top by moving the overshoot
* window, overshooting to the bottom/right is handled in
* gtk_scrolled_window_allocate_child()
*/
if (overshoot_x < 0)
window_allocation.x += -overshoot_x;
if (overshoot_y < 0)
window_allocation.y += -overshoot_y;
window_allocation.width -= ABS (overshoot_x);
window_allocation.height -= ABS (overshoot_y);
gdk_window_move_resize (priv->overshoot_window,
window_allocation.x, window_allocation.y,
window_allocation.width, window_allocation.height);
}
static void
gtk_scrolled_window_allocate_child (GtkScrolledWindow *swindow,
GtkAllocation *relative_allocation)
{
GtkWidget *widget = GTK_WIDGET (swindow), *child;
GtkAllocation allocation;
GtkAllocation child_allocation;
gint overshoot_x, overshoot_y;
child = gtk_bin_get_child (GTK_BIN (widget));
gtk_widget_get_allocation (widget, &allocation);
gtk_scrolled_window_relative_allocation (widget, relative_allocation);
_gtk_scrolled_window_get_overshoot (swindow, &overshoot_x, &overshoot_y);
/* Handle overshooting to the right/bottom by relocating the
* widget allocation to negative coordinates, so these edges
* stick to the overshoot window border.
*/
if (overshoot_x > 0)
child_allocation.x = -overshoot_x;
else
child_allocation.x = 0;
if (overshoot_y > 0)
child_allocation.y = -overshoot_y;
else
child_allocation.y = 0;
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;
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
g_return_if_fail (allocation != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
bin = GTK_BIN (scrolled_window);
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);
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_visible = FALSE;
if (priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
priv->vscrollbar_visible = TRUE;
else if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
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;
gboolean previous_hvis;
gboolean previous_vvis;
guint count = 0;
/* Determine scrollbar visibility first via hfw apis */
if (gtk_widget_get_request_mode (child) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
{
if (gtk_scrollable_get_hscroll_policy (GTK_SCROLLABLE (child)) == 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 (gtk_scrollable_get_vscroll_policy (GTK_SCROLLABLE (child)) == 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 ? 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 ? 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 ? sb_width + sb_spacing : 0);
}
else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
priv->vscrollbar_visible = child_scroll_height > allocation->height -
(priv->hscrollbar_visible ? sb_height + sb_spacing : 0);
}
}
else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
priv->hscrollbar_visible =
child_scroll_width > allocation->width -
(priv->vscrollbar_visible ? 0 : sb_width + sb_spacing);
else
priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
}
}
else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT */
{
if (gtk_scrollable_get_vscroll_policy (GTK_SCROLLABLE (child)) == 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 (gtk_scrollable_get_hscroll_policy (GTK_SCROLLABLE (child)) == 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 ? 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 ? 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 ? sb_height + sb_spacing : 0);
}
else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
priv->hscrollbar_visible = child_scroll_width > allocation->width -
(priv->vscrollbar_visible ? sb_width + sb_spacing : 0);
}
}
else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
priv->vscrollbar_visible =
child_scroll_height > allocation->height -
(priv->hscrollbar_visible ? 0 : sb_height + sb_spacing);
else
priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
}
}
/* 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->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
child_allocation.y = (relative_allocation.y +
relative_allocation.height +
sb_spacing);
else
child_allocation.y = relative_allocation.y - sb_spacing - sb_height;
child_allocation.width = relative_allocation.width;
child_allocation.height = sb_height;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
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->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_window_placement == GTK_CORNER_TOP_RIGHT)
child_allocation.y += padding.bottom + border.bottom;
else
child_allocation.y -= padding.top + border.top;
}
}
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->real_window_placement == GTK_CORNER_TOP_RIGHT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
(priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
child_allocation.x = (relative_allocation.x +
relative_allocation.width +
sb_spacing);
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;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
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->real_window_placement == GTK_CORNER_TOP_RIGHT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_RIGHT)) ||
(gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR &&
(priv->real_window_placement == GTK_CORNER_TOP_LEFT ||
priv->real_window_placement == GTK_CORNER_BOTTOM_LEFT)))
child_allocation.x += padding.right + border.right;
else
child_allocation.x -= padding.left + border.left;
}
}
gtk_widget_size_allocate (priv->vscrollbar, &child_allocation);
}
_gtk_scrolled_window_allocate_overshoot_window (scrolled_window);
}
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;
g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
scrolled_window = GTK_SCROLLED_WINDOW (widget);
priv = scrolled_window->priv;
if (gdk_event_get_scroll_deltas ((GdkEvent *) event, &delta_x, &delta_y))
{
if (delta_x != 0.0 && priv->hscrollbar &&
gtk_widget_get_visible (priv->hscrollbar))
{
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);
scroll_unit = pow (page_size, 2.0 / 3.0);
new_value = CLAMP (gtk_adjustment_get_value (adj) + delta_x * scroll_unit,
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 (delta_y != 0.0 && priv->vscrollbar &&
gtk_widget_get_visible (priv->vscrollbar))
{
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);
scroll_unit = pow (page_size, 2.0 / 3.0);
new_value = CLAMP (gtk_adjustment_get_value (adj) + delta_y * scroll_unit,
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;
}
}
else
{
GtkWidget *range;
if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
range = priv->vscrollbar;
else
range = priv->hscrollbar;
if (range && gtk_widget_get_visible (range))
{
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;
}
}
return handled;
}
static gboolean
_gtk_scrolled_window_set_adjustment_value (GtkScrolledWindow *scrolled_window,
GtkAdjustment *adjustment,
gdouble value,
gboolean allow_overshooting,
gboolean snap_to_border)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
gdouble lower, upper, *prev_value;
lower = gtk_adjustment_get_lower (adjustment);
upper = gtk_adjustment_get_upper (adjustment) -
gtk_adjustment_get_page_size (adjustment);
if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
prev_value = &priv->unclamped_hadj_value;
else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)))
prev_value = &priv->unclamped_vadj_value;
else
return FALSE;
if (snap_to_border)
{
if (*prev_value < 0 && value > 0)
value = 0;
else if (*prev_value > upper && value < upper)
value = upper;
}
if (allow_overshooting)
{
lower -= MAX_OVERSHOOT_DISTANCE;
upper += MAX_OVERSHOOT_DISTANCE;
}
*prev_value = CLAMP (value, lower, upper);
gtk_adjustment_set_value (adjustment, value);
return (*prev_value != value);
}
static gboolean
scrolled_window_deceleration_cb (gpointer user_data)
{
KineticScrollData *data = user_data;
GtkScrolledWindow *scrolled_window = data->scrolled_window;
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkAdjustment *hadjustment, *vadjustment;
gint old_overshoot_x, old_overshoot_y, overshoot_x, overshoot_y;
gdouble value;
gint64 current_time;
guint elapsed;
hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
_gtk_scrolled_window_get_overshoot (scrolled_window,
&old_overshoot_x, &old_overshoot_y);
current_time = g_get_monotonic_time ();
elapsed = (current_time - data->last_deceleration_time) / 1000;
data->last_deceleration_time = current_time;
if (hadjustment && priv->hscrollbar_visible)
{
value = priv->unclamped_hadj_value + (data->x_velocity * elapsed);
if (_gtk_scrolled_window_set_adjustment_value (scrolled_window,
hadjustment,
value, TRUE, TRUE))
data->x_velocity = 0;
}
else
data->x_velocity = 0;
if (vadjustment && priv->vscrollbar_visible)
{
value = priv->unclamped_vadj_value + (data->y_velocity * elapsed);
if (_gtk_scrolled_window_set_adjustment_value (scrolled_window,
vadjustment,
value, TRUE, TRUE))
data->y_velocity = 0;
}
else
data->y_velocity = 0;
_gtk_scrolled_window_get_overshoot (scrolled_window,
&overshoot_x, &overshoot_y);
if (overshoot_x == 0)
{
if (old_overshoot_x != 0)
{
/* Overshooting finished snapping back */
data->x_velocity = 0;
}
else if (data->x_velocity > 0)
{
data->x_velocity -= FRICTION_DECELERATION * elapsed * data->vel_sine;
data->x_velocity = MAX (0, data->x_velocity);
}
else if (data->x_velocity < 0)
{
data->x_velocity += FRICTION_DECELERATION * elapsed * data->vel_sine;
data->x_velocity = MIN (0, data->x_velocity);
}
}
else if (overshoot_x < 0)
data->x_velocity += OVERSHOOT_INVERSE_ACCELERATION * elapsed;
else if (overshoot_x > 0)
data->x_velocity -= OVERSHOOT_INVERSE_ACCELERATION * elapsed;
if (overshoot_y == 0)
{
if (old_overshoot_y != 0)
{
/* Overshooting finished snapping back */
data->y_velocity = 0;
}
else if (data->y_velocity > 0)
{
data->y_velocity -= FRICTION_DECELERATION * elapsed * data->vel_cosine;
data->y_velocity = MAX (0, data->y_velocity);
}
else if (data->y_velocity < 0)
{
data->y_velocity += FRICTION_DECELERATION * elapsed * data->vel_cosine;
data->y_velocity = MIN (0, data->y_velocity);
}
}
else if (overshoot_y < 0)
data->y_velocity += OVERSHOOT_INVERSE_ACCELERATION * elapsed;
else if (overshoot_y > 0)
data->y_velocity -= OVERSHOOT_INVERSE_ACCELERATION * elapsed;
if (old_overshoot_x != overshoot_x ||
old_overshoot_y != overshoot_y)
{
if (overshoot_x >= 0 || overshoot_y >= 0)
{
/* We need to reallocate the widget to have it at
* negative offset, so there's a "gravity" on the
* bottom/right corner
*/
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
else if (overshoot_x < 0 || overshoot_y < 0)
_gtk_scrolled_window_allocate_overshoot_window (scrolled_window);
}
if (overshoot_x != 0 || overshoot_y != 0 ||
data->x_velocity != 0 || data->y_velocity != 0)
return TRUE;
else
{
priv->deceleration_id = 0;
return FALSE;
}
}
static void
gtk_scrolled_window_cancel_deceleration (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
if (priv->deceleration_id)
{
g_source_remove (priv->deceleration_id);
priv->deceleration_id = 0;
}
}
static void
gtk_scrolled_window_start_deceleration (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
KineticScrollData *data;
gdouble angle;
data = g_new0 (KineticScrollData, 1);
data->scrolled_window = scrolled_window;
data->last_deceleration_time = g_get_monotonic_time ();
data->x_velocity = priv->x_velocity;
data->y_velocity = priv->y_velocity;
/* We use sine/cosine as a factor to deceleration x/y components
* of the vector, so we care about the sign later.
*/
angle = atan2 (ABS (data->x_velocity), ABS (data->y_velocity));
data->vel_cosine = cos (angle);
data->vel_sine = sin (angle);
scrolled_window->priv->deceleration_id =
gdk_threads_add_timeout_full (G_PRIORITY_DEFAULT,
FRAME_INTERVAL,
scrolled_window_deceleration_cb,
data, (GDestroyNotify) g_free);
}
static gboolean
gtk_scrolled_window_release_captured_event (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
/* Cancel the scrolling and send the button press
* event to the child widget
*/
if (!priv->button_press_event)
return FALSE;
if (priv->drag_device)
{
gtk_device_grab_remove (GTK_WIDGET (scrolled_window), priv->drag_device);
priv->drag_device = NULL;
}
if (priv->capture_button_press)
{
GtkWidget *event_widget;
event_widget = gtk_get_event_widget (priv->button_press_event);
if (!_gtk_propagate_captured_event (event_widget,
priv->button_press_event,
gtk_bin_get_child (GTK_BIN (scrolled_window))))
gtk_propagate_event (event_widget, priv->button_press_event);
gdk_event_free (priv->button_press_event);
priv->button_press_event = NULL;
}
if (_gtk_scrolled_window_get_overshoot (scrolled_window, NULL, NULL))
gtk_scrolled_window_start_deceleration (scrolled_window);
return FALSE;
}
static gboolean
gtk_scrolled_window_calculate_velocity (GtkScrolledWindow *scrolled_window,
GdkEvent *event)
{
GtkScrolledWindowPrivate *priv;
gdouble x_root, y_root;
guint32 _time;
#define STILL_THRESHOLD 40
if (!gdk_event_get_root_coords (event, &x_root, &y_root))
return FALSE;
priv = scrolled_window->priv;
_time = gdk_event_get_time (event);
if (priv->last_motion_event_x_root != x_root ||
priv->last_motion_event_y_root != y_root ||
ABS (_time - priv->last_motion_event_time) > STILL_THRESHOLD)
{
priv->x_velocity = (priv->last_motion_event_x_root - x_root) /
(gdouble) (_time - priv->last_motion_event_time);
priv->y_velocity = (priv->last_motion_event_y_root - y_root) /
(gdouble) (_time - priv->last_motion_event_time);
}
priv->last_motion_event_x_root = x_root;
priv->last_motion_event_y_root = y_root;
priv->last_motion_event_time = _time;
#undef STILL_THRESHOLD
return TRUE;
}
static gboolean
gtk_scrolled_window_captured_button_release (GtkWidget *widget,
GdkEvent *event)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkWidget *child;
gboolean overshoot;
guint button;
gdouble x_root, y_root;
if (gdk_event_get_button (event, &button) && button != 1)
return FALSE;
child = gtk_bin_get_child (GTK_BIN (widget));
if (!child)
return FALSE;
gtk_device_grab_remove (widget, priv->drag_device);
priv->drag_device = NULL;
if (priv->release_timeout_id)
{
g_source_remove (priv->release_timeout_id);
priv->release_timeout_id = 0;
}
overshoot = _gtk_scrolled_window_get_overshoot (scrolled_window, NULL, NULL);
if (priv->in_drag)
gdk_device_ungrab (gdk_event_get_device (event), gdk_event_get_time (event));
else
{
/* There hasn't been scrolling at all, so just let the
* child widget handle the button press normally
*/
gtk_scrolled_window_release_captured_event (scrolled_window);
if (!overshoot)
return FALSE;
}
priv->in_drag = FALSE;
if (priv->button_press_event)
{
gdk_event_free (priv->button_press_event);
priv->button_press_event = NULL;
}
gtk_scrolled_window_calculate_velocity (scrolled_window, event);
/* Zero out vector components without a visible scrollbar */
if (!priv->hscrollbar_visible)
priv->x_velocity = 0;
if (!priv->vscrollbar_visible)
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;
priv->last_button_event_valid = FALSE;
}
else
{
gdk_event_get_root_coords (event, &x_root, &y_root);
priv->last_button_event_x_root = x_root;
priv->last_button_event_y_root = y_root;
priv->last_button_event_valid = TRUE;
}
if (priv->capture_button_press)
return TRUE;
else
return FALSE;
}
static gboolean
gtk_scrolled_window_captured_motion_notify (GtkWidget *widget,
GdkEvent *event)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
gint old_overshoot_x, old_overshoot_y;
gint new_overshoot_x, new_overshoot_y;
GtkWidget *child;
GtkAdjustment *hadjustment;
GtkAdjustment *vadjustment;
gdouble dx, dy;
GdkModifierType state;
gdouble x_root, y_root;
gdk_event_get_state (event, &state);
if (!(state & GDK_BUTTON1_MASK))
return FALSE;
child = gtk_bin_get_child (GTK_BIN (widget));
if (!child)
return FALSE;
/* Check if we've passed the drag threshold */
gdk_event_get_root_coords (event, &x_root, &y_root);
if (!priv->in_drag)
{
if (gtk_drag_check_threshold (widget,
priv->last_button_event_x_root,
priv->last_button_event_y_root,
x_root, y_root))
{
if (priv->release_timeout_id)
{
g_source_remove (priv->release_timeout_id);
priv->release_timeout_id = 0;
}
priv->last_button_event_valid = FALSE;
priv->in_drag = TRUE;
}
else
return TRUE;
}
gdk_device_grab (priv->drag_device,
gtk_widget_get_window (widget),
GDK_OWNERSHIP_WINDOW,
TRUE,
GDK_BUTTON_RELEASE_MASK | GDK_BUTTON1_MOTION_MASK,
NULL,
gdk_event_get_time (event));
priv->last_button_event_valid = FALSE;
if (priv->button_press_event)
{
gdk_event_free (priv->button_press_event);
priv->button_press_event = NULL;
}
_gtk_scrolled_window_get_overshoot (scrolled_window,
&old_overshoot_x, &old_overshoot_y);
hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
if (hadjustment && priv->hscrollbar_visible)
{
dx = (priv->last_motion_event_x_root - x_root) + priv->unclamped_hadj_value;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, hadjustment,
dx, TRUE, FALSE);
}
vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
if (vadjustment && priv->vscrollbar_visible)
{
dy = (priv->last_motion_event_y_root - y_root) + priv->unclamped_vadj_value;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, vadjustment,
dy, TRUE, FALSE);
}
_gtk_scrolled_window_get_overshoot (scrolled_window,
&new_overshoot_x, &new_overshoot_y);
if (old_overshoot_x != new_overshoot_x ||
old_overshoot_y != new_overshoot_y)
{
if (new_overshoot_x >= 0 || new_overshoot_y >= 0)
{
/* We need to reallocate the widget to have it at
* negative offset, so there's a "gravity" on the
* bottom/right corner
*/
gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
}
else if (new_overshoot_x < 0 || new_overshoot_y < 0)
_gtk_scrolled_window_allocate_overshoot_window (scrolled_window);
}
gtk_scrolled_window_calculate_velocity (scrolled_window, event);
return TRUE;
}
static gboolean
gtk_scrolled_window_captured_button_press (GtkWidget *widget,
GdkEvent *event)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
GtkWidget *child;
GtkWidget *event_widget;
GdkDevice *source_device;
GdkInputSource source;
gdouble x_root, y_root;
guint button;
/* If scrollbars are not visible, we don't do kinetic scrolling */
if (!priv->vscrollbar_visible && !priv->hscrollbar_visible)
return FALSE;
source_device = gdk_event_get_source_device (event);
source = gdk_device_get_source (source_device);
if (source != GDK_SOURCE_TOUCHSCREEN)
return FALSE;
event_widget = gtk_get_event_widget (event);
/* If there's another scrolled window between the widget
* receiving the event and this capturing scrolled window,
* let it handle the events.
*/
if (widget != gtk_widget_get_ancestor (event_widget, GTK_TYPE_SCROLLED_WINDOW))
return FALSE;
/* Check whether the button press is close to the previous one,
* take that as a shortcut to get the child widget handle events
*/
gdk_event_get_root_coords (event, &x_root, &y_root);
if (priv->last_button_event_valid &&
ABS (x_root - priv->last_button_event_x_root) < TOUCH_BYPASS_CAPTURED_THRESHOLD &&
ABS (y_root - priv->last_button_event_y_root) < TOUCH_BYPASS_CAPTURED_THRESHOLD)
{
priv->last_button_event_valid = FALSE;
return FALSE;
}
priv->last_button_event_x_root = priv->last_motion_event_x_root = x_root;
priv->last_button_event_y_root = priv->last_motion_event_y_root = y_root;
priv->last_motion_event_time = gdk_event_get_time (event);
priv->last_button_event_valid = TRUE;
if (gdk_event_get_button (event, &button) && button != 1)
return FALSE;
child = gtk_bin_get_child (GTK_BIN (widget));
if (!child)
return FALSE;
if (priv->hscrollbar == event_widget || priv->vscrollbar == event_widget)
return FALSE;
priv->drag_device = gdk_event_get_device (event);
gtk_device_grab_add (widget, priv->drag_device, TRUE);
gtk_scrolled_window_cancel_deceleration (scrolled_window);
/* Only set the timeout if we're going to store an event */
if (priv->capture_button_press)
priv->release_timeout_id =
gdk_threads_add_timeout (RELEASE_EVENT_TIMEOUT,
(GSourceFunc) gtk_scrolled_window_release_captured_event,
scrolled_window);
priv->in_drag = FALSE;
if (priv->capture_button_press)
{
/* Store the button press event in
* case we need to propagate it later
*/
priv->button_press_event = gdk_event_copy (event);
return TRUE;
}
else
return FALSE;
}
static gboolean
gtk_scrolled_window_captured_event (GtkWidget *widget,
GdkEvent *event)
{
gboolean retval = FALSE;
GtkScrolledWindowPrivate *priv = GTK_SCROLLED_WINDOW (widget)->priv;
if (gdk_window_get_window_type (event->any.window) == GDK_WINDOW_TEMP)
return FALSE;
switch (event->type)
{
case GDK_TOUCH_BEGIN:
case GDK_BUTTON_PRESS:
retval = gtk_scrolled_window_captured_button_press (widget, event);
break;
case GDK_TOUCH_END:
case GDK_BUTTON_RELEASE:
if (priv->drag_device)
retval = gtk_scrolled_window_captured_button_release (widget, event);
else
priv->last_button_event_valid = FALSE;
break;
case GDK_TOUCH_UPDATE:
case GDK_MOTION_NOTIFY:
if (priv->drag_device)
retval = gtk_scrolled_window_captured_motion_notify (widget, event);
break;
case GDK_LEAVE_NOTIFY:
case GDK_ENTER_NOTIFY:
if (priv->in_drag &&
event->crossing.mode != GDK_CROSSING_GRAB)
retval = TRUE;
break;
default:
break;
}
return retval;
}
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;
g_return_if_fail (adjustment != NULL);
g_return_if_fail (data != NULL);
scrolled_window = GTK_SCROLLED_WINDOW (data);
priv = scrolled_window->priv;
if (priv->hscrollbar &&
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 (priv->vscrollbar &&
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 (priv->vscrollbar &&
adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)))
priv->unclamped_vadj_value = gtk_adjustment_get_value (adjustment);
else if (priv->hscrollbar &&
adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)))
priv->unclamped_hadj_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;
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;
if (gtk_widget_get_realized (GTK_WIDGET (bin)))
gtk_widget_set_parent_window (child, priv->overshoot_window);
_gtk_bin_set_child (bin, child);
gtk_widget_set_parent (child, GTK_WIDGET (bin));
hadj = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
vadj = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
if (GTK_IS_SCROLLABLE (child))
g_object_set (child, "hadjustment", hadj, "vadjustment", vadj, NULL);
else
g_warning ("gtk_scrolled_window_add(): cannot add non scrollable widget "
"use gtk_scrolled_window_add_with_viewport() instead");
}
static void
gtk_scrolled_window_remove (GtkContainer *container,
GtkWidget *child)
{
g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
g_return_if_fail (child != NULL);
g_return_if_fail (gtk_bin_get_child (GTK_BIN (container)) == child);
g_object_set (child, "hadjustment", NULL, "vadjustment", NULL, NULL);
/* chain parent class handler to remove child */
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.
*/
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_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
*
* Return value: the spacing, in pixels.
*/
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
{
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
{
minimum_req.height += vscrollbar_requisition.height;
natural_req.height += vscrollbar_requisition.height;
}
}
}
}
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC ||
priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
{
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 (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC ||
priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
{
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)
{
if (minimum_size)
*minimum_size = minimum_req.width;
if (natural_size)
*natural_size = natural_req.width;
}
else
{
if (minimum_size)
*minimum_size = minimum_req.height;
if (natural_size)
*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)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
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)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, minimum_width, natural_width);
}
static void
gtk_scrolled_window_realize (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
GtkAllocation allocation, relative_allocation;
GdkWindowAttr attributes;
GtkWidget *child_widget;
gint attributes_mask;
gtk_widget_set_realized (widget, TRUE);
gtk_widget_get_allocation (widget, &allocation);
gtk_scrolled_window_relative_allocation (widget, &relative_allocation);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = allocation.x + relative_allocation.x;
attributes.y = allocation.y + relative_allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK |
GDK_BUTTON_MOTION_MASK | GDK_TOUCH_MASK | GDK_EXPOSURE_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
scrolled_window->priv->overshoot_window =
gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (scrolled_window->priv->overshoot_window, widget);
child_widget = gtk_bin_get_child (GTK_BIN (widget));
if (child_widget)
gtk_widget_set_parent_window (child_widget,
scrolled_window->priv->overshoot_window);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->realize (widget);
}
static void
gtk_scrolled_window_unrealize (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
gdk_window_set_user_data (scrolled_window->priv->overshoot_window, NULL);
gdk_window_destroy (scrolled_window->priv->overshoot_window);
scrolled_window->priv->overshoot_window = NULL;
gtk_widget_set_realized (widget, FALSE);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->unrealize (widget);
}
static void
gtk_scrolled_window_map (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
gdk_window_show (scrolled_window->priv->overshoot_window);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->map (widget);
}
static void
gtk_scrolled_window_unmap (GtkWidget *widget)
{
GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget);
gdk_window_hide (scrolled_window->priv->overshoot_window);
GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->unmap (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;
priv->in_drag = FALSE;
if (priv->release_timeout_id)
{
g_source_remove (priv->release_timeout_id);
priv->release_timeout_id = 0;
}
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);
priv->last_button_event_valid = FALSE;
}
}
/**
* 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");
}
}
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