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gtk2/gdk/gdkevents.c
Matthias Clasen 9e6d3d969c Fix some possible crashes if the default display is NULL 
Unlikely that many people will hit these, but still.
https://bugzilla.gnome.org/show_bug.cgi?id=645176
2011-04-08 21:20:26 -04:00

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/* GDK - The GIMP Drawing Kit
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* 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 "gdkinternals.h"
#include "gdkdisplayprivate.h"
#include <string.h>
#include <math.h>
/**
* SECTION:events
* @Short_description: Functions for handling events from the window system
* @Title: Events
* @See_also: <link linkend="gdk-Event-Structures">Event Structures</link>
*
* This section describes functions dealing with events from the window
* system.
*
* In GTK+ applications the events are handled automatically in
* gtk_main_do_event() and passed on to the appropriate widgets, so these
* functions are rarely needed. Though some of the fields in the
* <link linkend="gdk-Event-Structures">Event Structures</link> are useful.
*/
typedef struct _GdkIOClosure GdkIOClosure;
struct _GdkIOClosure
{
GDestroyNotify notify;
gpointer data;
};
/* Private variable declarations
*/
static GdkEventFunc _gdk_event_func = NULL; /* Callback for events */
static gpointer _gdk_event_data = NULL;
static GDestroyNotify _gdk_event_notify = NULL;
void
_gdk_event_emit (GdkEvent *event)
{
if (_gdk_event_func)
(*_gdk_event_func) (event, _gdk_event_data);
}
/*********************************************
* Functions for maintaining the event queue *
*********************************************/
/**
* _gdk_event_queue_find_first:
* @display: a #GdkDisplay
*
* Find the first event on the queue that is not still
* being filled in.
*
* Return value: Pointer to the list node for that event, or NULL.
**/
GList*
_gdk_event_queue_find_first (GdkDisplay *display)
{
GList *tmp_list = display->queued_events;
while (tmp_list)
{
GdkEventPrivate *event = tmp_list->data;
if (!(event->flags & GDK_EVENT_PENDING))
return tmp_list;
tmp_list = g_list_next (tmp_list);
}
return NULL;
}
/**
* _gdk_event_queue_prepend:
* @display: a #GdkDisplay
* @event: Event to prepend.
*
* Prepends an event before the head of the event queue.
*
* Returns: the newly prepended list node.
**/
GList*
_gdk_event_queue_prepend (GdkDisplay *display,
GdkEvent *event)
{
display->queued_events = g_list_prepend (display->queued_events, event);
if (!display->queued_tail)
display->queued_tail = display->queued_events;
return display->queued_events;
}
/**
* _gdk_event_queue_append:
* @display: a #GdkDisplay
* @event: Event to append.
*
* Appends an event onto the tail of the event queue.
*
* Returns: the newly appended list node.
**/
GList *
_gdk_event_queue_append (GdkDisplay *display,
GdkEvent *event)
{
display->queued_tail = g_list_append (display->queued_tail, event);
if (!display->queued_events)
display->queued_events = display->queued_tail;
else
display->queued_tail = display->queued_tail->next;
return display->queued_tail;
}
/**
* _gdk_event_queue_insert_after:
* @display: a #GdkDisplay
* @sibling: Append after this event.
* @event: Event to append.
*
* Appends an event after the specified event, or if it isn't in
* the queue, onto the tail of the event queue.
*
* Returns: the newly appended list node.
*
* Since: 2.16
*/
GList*
_gdk_event_queue_insert_after (GdkDisplay *display,
GdkEvent *sibling,
GdkEvent *event)
{
GList *prev = g_list_find (display->queued_events, sibling);
if (prev && prev->next)
{
display->queued_events = g_list_insert_before (display->queued_events, prev->next, event);
return prev->next;
}
else
return _gdk_event_queue_append (display, event);
}
/**
* _gdk_event_queue_insert_after:
* @display: a #GdkDisplay
* @sibling: Append after this event.
* @event: Event to append.
*
* Appends an event before the specified event, or if it isn't in
* the queue, onto the tail of the event queue.
*
* Returns: the newly appended list node.
*
* Since: 2.16
*/
GList*
_gdk_event_queue_insert_before (GdkDisplay *display,
GdkEvent *sibling,
GdkEvent *event)
{
GList *next = g_list_find (display->queued_events, sibling);
if (next)
{
display->queued_events = g_list_insert_before (display->queued_events, next, event);
return next->prev;
}
else
return _gdk_event_queue_append (display, event);
}
/**
* _gdk_event_queue_remove_link:
* @display: a #GdkDisplay
* @node: node to remove
*
* Removes a specified list node from the event queue.
**/
void
_gdk_event_queue_remove_link (GdkDisplay *display,
GList *node)
{
if (node->prev)
node->prev->next = node->next;
else
display->queued_events = node->next;
if (node->next)
node->next->prev = node->prev;
else
display->queued_tail = node->prev;
}
/**
* _gdk_event_unqueue:
* @display: a #GdkDisplay
*
* Removes and returns the first event from the event
* queue that is not still being filled in.
*
* Return value: the event, or %NULL. Ownership is transferred
* to the caller.
**/
GdkEvent*
_gdk_event_unqueue (GdkDisplay *display)
{
GdkEvent *event = NULL;
GList *tmp_list;
tmp_list = _gdk_event_queue_find_first (display);
if (tmp_list)
{
event = tmp_list->data;
_gdk_event_queue_remove_link (display, tmp_list);
g_list_free_1 (tmp_list);
}
return event;
}
/**
* gdk_event_handler_set:
* @func: the function to call to handle events from GDK.
* @data: user data to pass to the function.
* @notify: the function to call when the handler function is removed, i.e. when
* gdk_event_handler_set() is called with another event handler.
*
* Sets the function to call to handle all events from GDK.
*
* Note that GTK+ uses this to install its own event handler, so it is
* usually not useful for GTK+ applications. (Although an application
* can call this function then call gtk_main_do_event() to pass
* events to GTK+.)
**/
void
gdk_event_handler_set (GdkEventFunc func,
gpointer data,
GDestroyNotify notify)
{
if (_gdk_event_notify)
(*_gdk_event_notify) (_gdk_event_data);
_gdk_event_func = func;
_gdk_event_data = data;
_gdk_event_notify = notify;
}
/**
* gdk_events_pending:
*
* Checks if any events are ready to be processed for any display.
*
* Return value: %TRUE if any events are pending.
*/
gboolean
gdk_events_pending (void)
{
GSList *list, *l;
gboolean pending;
pending = FALSE;
list = gdk_display_manager_list_displays (gdk_display_manager_get ());
for (l = list; l; l = l->next)
{
if (_gdk_event_queue_find_first (l->data))
{
pending = TRUE;
goto out;
}
}
for (l = list; l; l = l->next)
{
if (gdk_display_has_pending (l->data))
{
pending = TRUE;
goto out;
}
}
out:
g_slist_free (list);
return pending;
}
/**
* gdk_event_get:
*
* Checks all open displays for a #GdkEvent to process,to be processed
* on, fetching events from the windowing system if necessary.
* See gdk_display_get_event().
*
* Return value: the next #GdkEvent to be processed, or %NULL if no events
* are pending. The returned #GdkEvent should be freed with gdk_event_free().
**/
GdkEvent*
gdk_event_get (void)
{
GSList *list, *l;
GdkEvent *event;
event = NULL;
list = gdk_display_manager_list_displays (gdk_display_manager_get ());
for (l = list; l; l = l->next)
{
event = gdk_display_get_event (l->data);
if (event)
break;
}
g_slist_free (list);
return event;
}
/**
* gdk_event_peek:
*
* If there is an event waiting in the event queue of some open
* display, returns a copy of it. See gdk_display_peek_event().
*
* Return value: a copy of the first #GdkEvent on some event queue, or %NULL if no
* events are in any queues. The returned #GdkEvent should be freed with
* gdk_event_free().
**/
GdkEvent*
gdk_event_peek (void)
{
GSList *list, *l;
GdkEvent *event;
event = NULL;
list = gdk_display_manager_list_displays (gdk_display_manager_get ());
for (l = list; l; l = l->next)
{
event = gdk_display_peek_event (l->data);
if (event)
break;
}
g_slist_free (list);
return event;
}
/**
* gdk_event_put:
* @event: a #GdkEvent.
*
* Appends a copy of the given event onto the front of the event
* queue for event->any.window's display, or the default event
* queue if event->any.window is %NULL. See gdk_display_put_event().
**/
void
gdk_event_put (const GdkEvent *event)
{
GdkDisplay *display;
g_return_if_fail (event != NULL);
if (event->any.window)
display = gdk_window_get_display (event->any.window);
else
{
GDK_NOTE (MULTIHEAD,
g_message ("Falling back to default display for gdk_event_put()"));
display = gdk_display_get_default ();
}
gdk_display_put_event (display, event);
}
static GHashTable *event_hash = NULL;
/**
* gdk_event_new:
* @type: a #GdkEventType
*
* Creates a new event of the given type. All fields are set to 0.
*
* Return value: a newly-allocated #GdkEvent. The returned #GdkEvent
* should be freed with gdk_event_free().
*
* Since: 2.2
**/
GdkEvent*
gdk_event_new (GdkEventType type)
{
GdkEventPrivate *new_private;
GdkEvent *new_event;
if (!event_hash)
event_hash = g_hash_table_new (g_direct_hash, NULL);
new_private = g_slice_new0 (GdkEventPrivate);
new_private->flags = 0;
new_private->screen = NULL;
g_hash_table_insert (event_hash, new_private, GUINT_TO_POINTER (1));
new_event = (GdkEvent *) new_private;
new_event->any.type = type;
/*
* Bytewise 0 initialization is reasonable for most of the
* current event types. Explicitely initialize double fields
* since I trust bytewise 0 == 0. less than for integers
* or pointers.
*/
switch (type)
{
case GDK_MOTION_NOTIFY:
new_event->motion.x = 0.;
new_event->motion.y = 0.;
new_event->motion.x_root = 0.;
new_event->motion.y_root = 0.;
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
new_event->button.x = 0.;
new_event->button.y = 0.;
new_event->button.x_root = 0.;
new_event->button.y_root = 0.;
break;
case GDK_SCROLL:
new_event->scroll.x = 0.;
new_event->scroll.y = 0.;
new_event->scroll.x_root = 0.;
new_event->scroll.y_root = 0.;
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
new_event->crossing.x = 0.;
new_event->crossing.y = 0.;
new_event->crossing.x_root = 0.;
new_event->crossing.y_root = 0.;
break;
default:
break;
}
return new_event;
}
static gboolean
gdk_event_is_allocated (const GdkEvent *event)
{
if (event_hash)
return g_hash_table_lookup (event_hash, event) != NULL;
return FALSE;
}
/**
* gdk_event_copy:
* @event: a #GdkEvent
*
* Copies a #GdkEvent, copying or incrementing the reference count of the
* resources associated with it (e.g. #GdkWindow's and strings).
*
* Return value: a copy of @event. The returned #GdkEvent should be freed with
* gdk_event_free().
**/
GdkEvent*
gdk_event_copy (const GdkEvent *event)
{
GdkEventPrivate *new_private;
GdkEvent *new_event;
g_return_val_if_fail (event != NULL, NULL);
new_event = gdk_event_new (GDK_NOTHING);
new_private = (GdkEventPrivate *)new_event;
*new_event = *event;
if (new_event->any.window)
g_object_ref (new_event->any.window);
if (gdk_event_is_allocated (event))
{
GdkEventPrivate *private = (GdkEventPrivate *)event;
new_private->screen = private->screen;
new_private->device = private->device;
new_private->source_device = private->source_device;
}
switch (event->any.type)
{
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
new_event->key.string = g_strdup (event->key.string);
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
if (event->crossing.subwindow != NULL)
g_object_ref (event->crossing.subwindow);
break;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
g_object_ref (event->dnd.context);
break;
case GDK_EXPOSE:
case GDK_DAMAGE:
if (event->expose.region)
new_event->expose.region = cairo_region_copy (event->expose.region);
break;
case GDK_SETTING:
new_event->setting.name = g_strdup (new_event->setting.name);
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
if (event->button.axes)
new_event->button.axes = g_memdup (event->button.axes,
sizeof (gdouble) * gdk_device_get_n_axes (event->button.device));
break;
case GDK_MOTION_NOTIFY:
if (event->motion.axes)
new_event->motion.axes = g_memdup (event->motion.axes,
sizeof (gdouble) * gdk_device_get_n_axes (event->motion.device));
break;
case GDK_OWNER_CHANGE:
new_event->owner_change.owner = event->owner_change.owner;
if (new_event->owner_change.owner)
g_object_ref (new_event->owner_change.owner);
break;
case GDK_SELECTION_CLEAR:
case GDK_SELECTION_NOTIFY:
case GDK_SELECTION_REQUEST:
new_event->selection.requestor = event->selection.requestor;
if (new_event->selection.requestor)
g_object_unref (new_event->selection.requestor);
break;
default:
break;
}
if (gdk_event_is_allocated (event))
_gdk_display_event_data_copy (gdk_display_get_default (), event, new_event);
return new_event;
}
/**
* gdk_event_free:
* @event: a #GdkEvent.
*
* Frees a #GdkEvent, freeing or decrementing any resources associated with it.
* Note that this function should only be called with events returned from
* functions such as gdk_event_peek(), gdk_event_get(), gdk_event_copy()
* and gdk_event_new().
**/
void
gdk_event_free (GdkEvent *event)
{
GdkDisplay *display;
g_return_if_fail (event != NULL);
if (event->any.window)
g_object_unref (event->any.window);
switch (event->any.type)
{
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
g_free (event->key.string);
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
if (event->crossing.subwindow != NULL)
g_object_unref (event->crossing.subwindow);
break;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
if (event->dnd.context != NULL)
g_object_unref (event->dnd.context);
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
g_free (event->button.axes);
break;
case GDK_EXPOSE:
case GDK_DAMAGE:
if (event->expose.region)
cairo_region_destroy (event->expose.region);
break;
case GDK_MOTION_NOTIFY:
g_free (event->motion.axes);
break;
case GDK_SETTING:
g_free (event->setting.name);
break;
case GDK_OWNER_CHANGE:
if (event->owner_change.owner)
g_object_unref (event->owner_change.owner);
break;
case GDK_SELECTION_CLEAR:
case GDK_SELECTION_NOTIFY:
case GDK_SELECTION_REQUEST:
if (event->selection.requestor)
g_object_unref (event->selection.requestor);
break;
default:
break;
}
display = gdk_display_get_default ();
if (display)
_gdk_display_event_data_free (display, event);
g_hash_table_remove (event_hash, event);
g_slice_free (GdkEventPrivate, (GdkEventPrivate*) event);
}
/**
* gdk_event_get_time:
* @event: a #GdkEvent
*
* Returns the time stamp from @event, if there is one; otherwise
* returns #GDK_CURRENT_TIME. If @event is %NULL, returns #GDK_CURRENT_TIME.
*
* Return value: time stamp field from @event
**/
guint32
gdk_event_get_time (const GdkEvent *event)
{
if (event)
switch (event->type)
{
case GDK_MOTION_NOTIFY:
return event->motion.time;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
return event->button.time;
case GDK_SCROLL:
return event->scroll.time;
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
return event->key.time;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
return event->crossing.time;
case GDK_PROPERTY_NOTIFY:
return event->property.time;
case GDK_SELECTION_CLEAR:
case GDK_SELECTION_REQUEST:
case GDK_SELECTION_NOTIFY:
return event->selection.time;
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
return event->proximity.time;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
return event->dnd.time;
case GDK_CLIENT_EVENT:
case GDK_VISIBILITY_NOTIFY:
case GDK_CONFIGURE:
case GDK_FOCUS_CHANGE:
case GDK_NOTHING:
case GDK_DAMAGE:
case GDK_DELETE:
case GDK_DESTROY:
case GDK_EXPOSE:
case GDK_MAP:
case GDK_UNMAP:
case GDK_WINDOW_STATE:
case GDK_SETTING:
case GDK_OWNER_CHANGE:
case GDK_GRAB_BROKEN:
case GDK_EVENT_LAST:
/* return current time */
break;
}
return GDK_CURRENT_TIME;
}
/**
* gdk_event_get_state:
* @event: a #GdkEvent or NULL
* @state: (out): return location for state
*
* If the event contains a "state" field, puts that field in @state. Otherwise
* stores an empty state (0). Returns %TRUE if there was a state field
* in the event. @event may be %NULL, in which case it's treated
* as if the event had no state field.
*
* Return value: %TRUE if there was a state field in the event
**/
gboolean
gdk_event_get_state (const GdkEvent *event,
GdkModifierType *state)
{
g_return_val_if_fail (state != NULL, FALSE);
if (event)
switch (event->type)
{
case GDK_MOTION_NOTIFY:
*state = event->motion.state;
return TRUE;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
*state = event->button.state;
return TRUE;
case GDK_SCROLL:
*state = event->scroll.state;
return TRUE;
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
*state = event->key.state;
return TRUE;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
*state = event->crossing.state;
return TRUE;
case GDK_PROPERTY_NOTIFY:
case GDK_VISIBILITY_NOTIFY:
case GDK_CLIENT_EVENT:
case GDK_CONFIGURE:
case GDK_FOCUS_CHANGE:
case GDK_SELECTION_CLEAR:
case GDK_SELECTION_REQUEST:
case GDK_SELECTION_NOTIFY:
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
case GDK_DAMAGE:
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
case GDK_NOTHING:
case GDK_DELETE:
case GDK_DESTROY:
case GDK_EXPOSE:
case GDK_MAP:
case GDK_UNMAP:
case GDK_WINDOW_STATE:
case GDK_SETTING:
case GDK_OWNER_CHANGE:
case GDK_GRAB_BROKEN:
case GDK_EVENT_LAST:
/* no state field */
break;
}
*state = 0;
return FALSE;
}
/**
* gdk_event_get_coords:
* @event: a #GdkEvent
* @x_win: (out): location to put event window x coordinate
* @y_win: (out): location to put event window y coordinate
*
* Extract the event window relative x/y coordinates from an event.
*
* Return value: %TRUE if the event delivered event window coordinates
**/
gboolean
gdk_event_get_coords (const GdkEvent *event,
gdouble *x_win,
gdouble *y_win)
{
gdouble x = 0, y = 0;
gboolean fetched = TRUE;
g_return_val_if_fail (event != NULL, FALSE);
switch (event->type)
{
case GDK_CONFIGURE:
x = event->configure.x;
y = event->configure.y;
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
x = event->crossing.x;
y = event->crossing.y;
break;
case GDK_SCROLL:
x = event->scroll.x;
y = event->scroll.y;
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
x = event->button.x;
y = event->button.y;
break;
case GDK_MOTION_NOTIFY:
x = event->motion.x;
y = event->motion.y;
break;
default:
fetched = FALSE;
break;
}
if (x_win)
*x_win = x;
if (y_win)
*y_win = y;
return fetched;
}
/**
* gdk_event_get_root_coords:
* @event: a #GdkEvent
* @x_root: (out): location to put root window x coordinate
* @y_root: (out): location to put root window y coordinate
*
* Extract the root window relative x/y coordinates from an event.
*
* Return value: %TRUE if the event delivered root window coordinates
**/
gboolean
gdk_event_get_root_coords (const GdkEvent *event,
gdouble *x_root,
gdouble *y_root)
{
gdouble x = 0, y = 0;
gboolean fetched = TRUE;
g_return_val_if_fail (event != NULL, FALSE);
switch (event->type)
{
case GDK_MOTION_NOTIFY:
x = event->motion.x_root;
y = event->motion.y_root;
break;
case GDK_SCROLL:
x = event->scroll.x_root;
y = event->scroll.y_root;
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
x = event->button.x_root;
y = event->button.y_root;
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
x = event->crossing.x_root;
y = event->crossing.y_root;
break;
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
x = event->dnd.x_root;
y = event->dnd.y_root;
break;
default:
fetched = FALSE;
break;
}
if (x_root)
*x_root = x;
if (y_root)
*y_root = y;
return fetched;
}
/**
* gdk_event_get_axis:
* @event: a #GdkEvent
* @axis_use: the axis use to look for
* @value: (out): location to store the value found
*
* Extract the axis value for a particular axis use from
* an event structure.
*
* Return value: %TRUE if the specified axis was found, otherwise %FALSE
**/
gboolean
gdk_event_get_axis (const GdkEvent *event,
GdkAxisUse axis_use,
gdouble *value)
{
gdouble *axes;
GdkDevice *device;
g_return_val_if_fail (event != NULL, FALSE);
if (axis_use == GDK_AXIS_X || axis_use == GDK_AXIS_Y)
{
gdouble x, y;
switch (event->type)
{
case GDK_MOTION_NOTIFY:
x = event->motion.x;
y = event->motion.y;
break;
case GDK_SCROLL:
x = event->scroll.x;
y = event->scroll.y;
break;
case GDK_BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
x = event->button.x;
y = event->button.y;
break;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
x = event->crossing.x;
y = event->crossing.y;
break;
default:
return FALSE;
}
if (axis_use == GDK_AXIS_X && value)
*value = x;
if (axis_use == GDK_AXIS_Y && value)
*value = y;
return TRUE;
}
else if (event->type == GDK_BUTTON_PRESS ||
event->type == GDK_BUTTON_RELEASE)
{
device = event->button.device;
axes = event->button.axes;
}
else if (event->type == GDK_MOTION_NOTIFY)
{
device = event->motion.device;
axes = event->motion.axes;
}
else
return FALSE;
return gdk_device_get_axis (device, axes, axis_use, value);
}
/**
* gdk_event_set_device:
* @event: a #GdkEvent
* @device: a #GdkDevice
*
* Sets the device for @event to @device. The event must
* have been allocated by GTK+, for instance, by
* gdk_event_copy().
*
* Since: 3.0
**/
void
gdk_event_set_device (GdkEvent *event,
GdkDevice *device)
{
GdkEventPrivate *private;
g_return_if_fail (gdk_event_is_allocated (event));
private = (GdkEventPrivate *) event;
private->device = device;
switch (event->type)
{
case GDK_MOTION_NOTIFY:
event->motion.device = device;
break;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
event->button.device = device;
break;
case GDK_SCROLL:
event->scroll.device = device;
break;
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
event->proximity.device = device;
break;
default:
break;
}
}
/**
* gdk_event_get_device:
* @event: a #GdkEvent.
*
* If the event contains a "device" field, this function will return
* it, else it will return %NULL.
*
* Returns: (transfer none): a #GdkDevice, or %NULL.
*
* Since: 3.0
**/
GdkDevice *
gdk_event_get_device (const GdkEvent *event)
{
g_return_val_if_fail (event != NULL, NULL);
if (gdk_event_is_allocated (event))
{
GdkEventPrivate *private = (GdkEventPrivate *) event;
if (private->device)
return private->device;
}
switch (event->type)
{
case GDK_MOTION_NOTIFY:
return event->motion.device;
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
return event->button.device;
case GDK_SCROLL:
return event->scroll.device;
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
return event->proximity.device;
default:
break;
}
/* Fallback if event has no device set */
switch (event->type)
{
case GDK_MOTION_NOTIFY:
case GDK_BUTTON_PRESS:
case GDK_2BUTTON_PRESS:
case GDK_3BUTTON_PRESS:
case GDK_BUTTON_RELEASE:
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
case GDK_FOCUS_CHANGE:
case GDK_PROXIMITY_IN:
case GDK_PROXIMITY_OUT:
case GDK_DRAG_ENTER:
case GDK_DRAG_LEAVE:
case GDK_DRAG_MOTION:
case GDK_DRAG_STATUS:
case GDK_DROP_START:
case GDK_DROP_FINISHED:
case GDK_SCROLL:
case GDK_GRAB_BROKEN:
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
{
GdkDisplay *display;
GdkDeviceManager *device_manager;
GdkDevice *client_pointer;
g_warning ("Event with type %d not holding a GdkDevice. "
"It is most likely synthesized outside Gdk/GTK+\n",
event->type);
display = gdk_window_get_display (event->any.window);
device_manager = gdk_display_get_device_manager (display);
client_pointer = gdk_device_manager_get_client_pointer (device_manager);
if (event->type == GDK_KEY_PRESS ||
event->type == GDK_KEY_RELEASE)
return gdk_device_get_associated_device (client_pointer);
else
return client_pointer;
}
break;
default:
return NULL;
}
}
/**
* gdk_event_set_source_device:
* @event: a #GdkEvent
* @device: a #GdkDevice
*
* Sets the slave device for @event to @device.
*
* The event must have been allocated by GTK+,
* for instance by gdk_event_copy().
*
* Since: 3.0
**/
void
gdk_event_set_source_device (GdkEvent *event,
GdkDevice *device)
{
GdkEventPrivate *private;
g_return_if_fail (gdk_event_is_allocated (event));
g_return_if_fail (GDK_IS_DEVICE (device));
private = (GdkEventPrivate *) event;
private->source_device = device;
}
/**
* gdk_event_get_source_device:
* @event: a #GdkEvent
*
* This function returns the hardware (slave) #GdkDevice that has
* triggered the event, falling back to the virtual (master) device
* (as in gdk_event_get_device()) if the event wasn't caused by
* interaction with a hardware device. This may happen for example
* in synthesized crossing events after a #GdkWindow updates its
* geometry or a grab is acquired/released.
*
* If the event does not contain a device field, this function will
* return %NULL.
*
* Returns: (transfer none): a #GdkDevice, or %NULL.
*
* Since: 3.0
**/
GdkDevice *
gdk_event_get_source_device (const GdkEvent *event)
{
GdkEventPrivate *private;
g_return_val_if_fail (event != NULL, NULL);
if (!gdk_event_is_allocated (event))
return NULL;
private = (GdkEventPrivate *) event;
if (private->source_device)
return private->source_device;
/* Fallback to event device */
return gdk_event_get_device (event);
}
/**
* gdk_event_request_motions:
* @event: a valid #GdkEvent
*
* Request more motion notifies if @event is a motion notify hint event.
*
* This function should be used instead of gdk_window_get_pointer() to
* request further motion notifies, because it also works for extension
* events where motion notifies are provided for devices other than the
* core pointer. Coordinate extraction, processing and requesting more
* motion events from a %GDK_MOTION_NOTIFY event usually works like this:
*
* |[
* {
* /&ast; motion_event handler &ast;/
* x = motion_event->x;
* y = motion_event->y;
* /&ast; handle (x,y) motion &ast;/
* gdk_event_request_motions (motion_event); /&ast; handles is_hint events &ast;/
* }
* ]|
*
* Since: 2.12
**/
void
gdk_event_request_motions (const GdkEventMotion *event)
{
GdkDisplay *display;
g_return_if_fail (event != NULL);
if (event->type == GDK_MOTION_NOTIFY && event->is_hint)
{
gdk_device_get_state (event->device, event->window, NULL, NULL);
display = gdk_window_get_display (event->window);
_gdk_display_enable_motion_hints (display, event->device);
}
}
static gboolean
gdk_events_get_axis_distances (GdkEvent *event1,
GdkEvent *event2,
gdouble *x_distance,
gdouble *y_distance,
gdouble *distance)
{
gdouble x1, x2, y1, y2;
gdouble xd, yd;
if (!gdk_event_get_coords (event1, &x1, &y1) ||
!gdk_event_get_coords (event2, &x2, &y2))
return FALSE;
xd = x2 - x1;
yd = y2 - y1;
if (x_distance)
*x_distance = xd;
if (y_distance)
*y_distance = yd;
if (distance)
*distance = sqrt ((xd * xd) + (yd * yd));
return TRUE;
}
/**
* gdk_events_get_distance:
* @event1: first #GdkEvent
* @event2: second #GdkEvent
* @distance: (out): return location for the distance
*
* If both events have X/Y information, the distance between both coordinates
* (as in a straight line going from @event1 to @event2) will be returned.
*
* Returns: %TRUE if the distance could be calculated.
*
* Since: 3.0
**/
gboolean
gdk_events_get_distance (GdkEvent *event1,
GdkEvent *event2,
gdouble *distance)
{
return gdk_events_get_axis_distances (event1, event2,
NULL, NULL,
distance);
}
/**
* gdk_events_get_angle:
* @event1: first #GdkEvent
* @event2: second #GdkEvent
* @angle: (out): return location for the relative angle between both events
*
* If both events contain X/Y information, this function will return %TRUE
* and return in @angle the relative angle from @event1 to @event2. The rotation
* direction for positive angles is from the positive X axis towards the positive
* Y axis.
*
* Returns: %TRUE if the angle could be calculated.
*
* Since: 3.0
**/
gboolean
gdk_events_get_angle (GdkEvent *event1,
GdkEvent *event2,
gdouble *angle)
{
gdouble x_distance, y_distance, distance;
if (!gdk_events_get_axis_distances (event1, event2,
&x_distance, &y_distance,
&distance))
return FALSE;
if (angle)
{
*angle = atan2 (x_distance, y_distance);
/* Invert angle */
*angle = (2 * G_PI) - *angle;
/* Shift it 90° */
*angle += G_PI / 2;
/* And constraint it to 0°-360° */
*angle = fmod (*angle, 2 * G_PI);
}
return TRUE;
}
/**
* gdk_events_get_center:
* @event1: first #GdkEvent
* @event2: second #GdkEvent
* @x: (out): return location for the X coordinate of the center
* @y: (out): return location for the Y coordinate of the center
*
* If both events contain X/Y information, the center of both coordinates
* will be returned in @x and @y.
*
* Returns: %TRUE if the center could be calculated.
*
* Since: 3.0
**/
gboolean
gdk_events_get_center (GdkEvent *event1,
GdkEvent *event2,
gdouble *x,
gdouble *y)
{
gdouble x1, x2, y1, y2;
if (!gdk_event_get_coords (event1, &x1, &y1) ||
!gdk_event_get_coords (event2, &x2, &y2))
return FALSE;
if (x)
*x = (x2 + x1) / 2;
if (y)
*y = (y2 + y1) / 2;
return TRUE;
}
/**
* gdk_event_set_screen:
* @event: a #GdkEvent
* @screen: a #GdkScreen
*
* Sets the screen for @event to @screen. The event must
* have been allocated by GTK+, for instance, by
* gdk_event_copy().
*
* Since: 2.2
**/
void
gdk_event_set_screen (GdkEvent *event,
GdkScreen *screen)
{
GdkEventPrivate *private;
g_return_if_fail (gdk_event_is_allocated (event));
private = (GdkEventPrivate *)event;
private->screen = screen;
}
/**
* gdk_event_get_screen:
* @event: a #GdkEvent
*
* Returns the screen for the event. The screen is
* typically the screen for <literal>event->any.window</literal>, but
* for events such as mouse events, it is the screen
* where the pointer was when the event occurs -
* that is, the screen which has the root window
* to which <literal>event->motion.x_root</literal> and
* <literal>event->motion.y_root</literal> are relative.
*
* Return value: (transfer none): the screen for the event
*
* Since: 2.2
**/
GdkScreen *
gdk_event_get_screen (const GdkEvent *event)
{
if (gdk_event_is_allocated (event))
{
GdkEventPrivate *private = (GdkEventPrivate *)event;
if (private->screen)
return private->screen;
}
if (event->any.window)
return gdk_window_get_screen (event->any.window);
return NULL;
}
/**
* gdk_set_show_events:
* @show_events: %TRUE to output event debugging information.
*
* Sets whether a trace of received events is output.
* Note that GTK+ must be compiled with debugging (that is,
* configured using the <option>--enable-debug</option> option)
* to use this option.
**/
void
gdk_set_show_events (gboolean show_events)
{
if (show_events)
_gdk_debug_flags |= GDK_DEBUG_EVENTS;
else
_gdk_debug_flags &= ~GDK_DEBUG_EVENTS;
}
/**
* gdk_get_show_events:
*
* Gets whether event debugging output is enabled.
*
* Return value: %TRUE if event debugging output is enabled.
**/
gboolean
gdk_get_show_events (void)
{
return (_gdk_debug_flags & GDK_DEBUG_EVENTS) != 0;
}
/* What do we do with G_IO_NVAL?
*/
#define READ_CONDITION (G_IO_IN | G_IO_HUP | G_IO_ERR)
#define WRITE_CONDITION (G_IO_OUT | G_IO_ERR)
#define EXCEPTION_CONDITION (G_IO_PRI)
static void
gdk_synthesize_click (GdkDisplay *display,
GdkEvent *event,
gint nclicks)
{
GdkEvent *event_copy;
event_copy = gdk_event_copy (event);
event_copy->type = (nclicks == 2) ? GDK_2BUTTON_PRESS : GDK_3BUTTON_PRESS;
_gdk_event_queue_append (display, event_copy);
}
void
_gdk_event_button_generate (GdkDisplay *display,
GdkEvent *event)
{
GdkMultipleClickInfo *info;
g_return_if_fail (event->type == GDK_BUTTON_PRESS);
info = g_hash_table_lookup (display->multiple_click_info, event->button.device);
if (G_UNLIKELY (!info))
{
info = g_new0 (GdkMultipleClickInfo, 1);
info->button_number[0] = info->button_number[1] = -1;
g_hash_table_insert (display->multiple_click_info,
event->button.device, info);
}
if ((event->button.time < (info->button_click_time[1] + 2 * display->double_click_time)) &&
(event->button.window == info->button_window[1]) &&
(event->button.button == info->button_number[1]) &&
(ABS (event->button.x - info->button_x[1]) <= display->double_click_distance) &&
(ABS (event->button.y - info->button_y[1]) <= display->double_click_distance))
{
gdk_synthesize_click (display, event, 3);
info->button_click_time[1] = 0;
info->button_click_time[0] = 0;
info->button_window[1] = NULL;
info->button_window[0] = NULL;
info->button_number[1] = -1;
info->button_number[0] = -1;
info->button_x[0] = info->button_x[1] = 0;
info->button_y[0] = info->button_y[1] = 0;
}
else if ((event->button.time < (info->button_click_time[0] + display->double_click_time)) &&
(event->button.window == info->button_window[0]) &&
(event->button.button == info->button_number[0]) &&
(ABS (event->button.x - info->button_x[0]) <= display->double_click_distance) &&
(ABS (event->button.y - info->button_y[0]) <= display->double_click_distance))
{
gdk_synthesize_click (display, event, 2);
info->button_click_time[1] = info->button_click_time[0];
info->button_click_time[0] = event->button.time;
info->button_window[1] = info->button_window[0];
info->button_window[0] = event->button.window;
info->button_number[1] = info->button_number[0];
info->button_number[0] = event->button.button;
info->button_x[1] = info->button_x[0];
info->button_x[0] = event->button.x;
info->button_y[1] = info->button_y[0];
info->button_y[0] = event->button.y;
}
else
{
info->button_click_time[1] = 0;
info->button_click_time[0] = event->button.time;
info->button_window[1] = NULL;
info->button_window[0] = event->button.window;
info->button_number[1] = -1;
info->button_number[0] = event->button.button;
info->button_x[1] = 0;
info->button_x[0] = event->button.x;
info->button_y[1] = 0;
info->button_y[0] = event->button.y;
}
}
void
gdk_synthesize_window_state (GdkWindow *window,
GdkWindowState unset_flags,
GdkWindowState set_flags)
{
GdkEvent temp_event;
GdkWindowState old;
g_return_if_fail (window != NULL);
temp_event.window_state.window = window;
temp_event.window_state.type = GDK_WINDOW_STATE;
temp_event.window_state.send_event = FALSE;
old = temp_event.window_state.window->state;
temp_event.window_state.new_window_state = old;
temp_event.window_state.new_window_state |= set_flags;
temp_event.window_state.new_window_state &= ~unset_flags;
temp_event.window_state.changed_mask = temp_event.window_state.new_window_state ^ old;
if (temp_event.window_state.new_window_state == old)
return; /* No actual work to do, nothing changed. */
/* Actually update the field in GdkWindow, this is sort of an odd
* place to do it, but seems like the safest since it ensures we expose no
* inconsistent state to the user.
*/
window->state = temp_event.window_state.new_window_state;
if (temp_event.window_state.changed_mask & GDK_WINDOW_STATE_WITHDRAWN)
_gdk_window_update_viewable (window);
/* We only really send the event to toplevels, since
* all the window states don't apply to non-toplevels.
* Non-toplevels do use the GDK_WINDOW_STATE_WITHDRAWN flag
* internally so we needed to update window->state.
*/
switch (window->window_type)
{
case GDK_WINDOW_TOPLEVEL:
case GDK_WINDOW_TEMP: /* ? */
gdk_display_put_event (gdk_window_get_display (window), &temp_event);
break;
case GDK_WINDOW_FOREIGN:
case GDK_WINDOW_ROOT:
case GDK_WINDOW_CHILD:
break;
}
}
/**
* gdk_display_set_double_click_time:
* @display: a #GdkDisplay
* @msec: double click time in milliseconds (thousandths of a second)
*
* Sets the double click time (two clicks within this time interval
* count as a double click and result in a #GDK_2BUTTON_PRESS event).
* Applications should <emphasis>not</emphasis> set this, it is a global
* user-configured setting.
*
* Since: 2.2
**/
void
gdk_display_set_double_click_time (GdkDisplay *display,
guint msec)
{
display->double_click_time = msec;
}
/**
* gdk_set_double_click_time:
* @msec: double click time in milliseconds (thousandths of a second)
*
* Set the double click time for the default display. See
* gdk_display_set_double_click_time().
* See also gdk_display_set_double_click_distance().
* Applications should <emphasis>not</emphasis> set this, it is a
* global user-configured setting.
**/
void
gdk_set_double_click_time (guint msec)
{
gdk_display_set_double_click_time (gdk_display_get_default (), msec);
}
/**
* gdk_display_set_double_click_distance:
* @display: a #GdkDisplay
* @distance: distance in pixels
*
* Sets the double click distance (two clicks within this distance
* count as a double click and result in a #GDK_2BUTTON_PRESS event).
* See also gdk_display_set_double_click_time().
* Applications should <emphasis>not</emphasis> set this, it is a global
* user-configured setting.
*
* Since: 2.4
**/
void
gdk_display_set_double_click_distance (GdkDisplay *display,
guint distance)
{
display->double_click_distance = distance;
}
G_DEFINE_BOXED_TYPE (GdkEvent, gdk_event,
gdk_event_copy,
gdk_event_free)
/**
* gdk_setting_get:
* @name: the name of the setting.
* @value: location to store the value of the setting.
*
* Obtains a desktop-wide setting, such as the double-click time,
* for the default screen. See gdk_screen_get_setting().
*
* Returns: %TRUE if the setting existed and a value was stored
* in @value, %FALSE otherwise.
**/
gboolean
gdk_setting_get (const gchar *name,
GValue *value)
{
return gdk_screen_get_setting (gdk_screen_get_default (), name, value);
}
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