gtk/gdk/x11/gdkeventsource.c
Owen W. Taylor f50a3af1b7 Handle recursion from motion event handlers
If a motion event handler (or other handler running from the flush-events
phase of the frame clock) recursed the main loop then flushing wouldn't
complete until after the recursed main loop returned, and various aspects
of the state would get out of sync.

To fix this, change flushing of the event queue to simply mark events as
ready to flush, and let normal event delivery handle the rest.

https://bugzilla.gnome.org/show_bug.cgi?id=705176
2013-11-11 23:17:14 -05:00

464 lines
12 KiB
C

/* GDK - The GIMP Drawing Kit
* Copyright (C) 2009 Carlos Garnacho <carlosg@gnome.org>
*
* 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/>.
*/
#include "config.h"
#include "gdkeventsource.h"
#include "gdkinternals.h"
#include "gdkwindow-x11.h"
#include "gdkprivate-x11.h"
static gboolean gdk_event_source_prepare (GSource *source,
gint *timeout);
static gboolean gdk_event_source_check (GSource *source);
static gboolean gdk_event_source_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data);
static void gdk_event_source_finalize (GSource *source);
#define HAS_FOCUS(toplevel) \
((toplevel)->has_focus || (toplevel)->has_pointer_focus)
struct _GdkEventSource
{
GSource source;
GdkDisplay *display;
GPollFD event_poll_fd;
GList *translators;
};
static GSourceFuncs event_funcs = {
gdk_event_source_prepare,
gdk_event_source_check,
gdk_event_source_dispatch,
gdk_event_source_finalize
};
static GList *event_sources = NULL;
static gint
gdk_event_apply_filters (XEvent *xevent,
GdkEvent *event,
GdkWindow *window)
{
GList *tmp_list;
GdkFilterReturn result;
if (window == NULL)
tmp_list = _gdk_default_filters;
else
tmp_list = window->filters;
while (tmp_list)
{
GdkEventFilter *filter = (GdkEventFilter*) tmp_list->data;
GList *node;
if ((filter->flags & GDK_EVENT_FILTER_REMOVED) != 0)
{
tmp_list = tmp_list->next;
continue;
}
filter->ref_count++;
result = filter->function (xevent, event, filter->data);
/* Protect against unreffing the filter mutating the list */
node = tmp_list->next;
_gdk_event_filter_unref (window, filter);
tmp_list = node;
if (result != GDK_FILTER_CONTINUE)
return result;
}
return GDK_FILTER_CONTINUE;
}
static GdkWindow *
gdk_event_source_get_filter_window (GdkEventSource *event_source,
XEvent *xevent,
GdkEventTranslator **event_translator)
{
GList *list = event_source->translators;
GdkWindow *window;
*event_translator = NULL;
while (list)
{
GdkEventTranslator *translator = list->data;
list = list->next;
window = _gdk_x11_event_translator_get_window (translator,
event_source->display,
xevent);
if (window)
{
*event_translator = translator;
return window;
}
}
window = gdk_x11_window_lookup_for_display (event_source->display,
xevent->xany.window);
if (window && !GDK_IS_WINDOW (window))
window = NULL;
return window;
}
static void
handle_focus_change (GdkEventCrossing *event)
{
GdkToplevelX11 *toplevel;
gboolean focus_in, had_focus;
toplevel = _gdk_x11_window_get_toplevel (event->window);
focus_in = (event->type == GDK_ENTER_NOTIFY);
if (!toplevel || event->detail == GDK_NOTIFY_INFERIOR)
return;
toplevel->has_pointer = focus_in;
if (!event->focus || toplevel->has_focus_window)
return;
had_focus = HAS_FOCUS (toplevel);
toplevel->has_pointer_focus = focus_in;
if (HAS_FOCUS (toplevel) != had_focus)
{
GdkEvent *focus_event;
focus_event = gdk_event_new (GDK_FOCUS_CHANGE);
focus_event->focus_change.window = g_object_ref (event->window);
focus_event->focus_change.send_event = FALSE;
focus_event->focus_change.in = focus_in;
gdk_event_set_device (focus_event, gdk_event_get_device ((GdkEvent *) event));
gdk_event_put (focus_event);
gdk_event_free (focus_event);
}
}
static GdkEvent *
gdk_event_source_translate_event (GdkEventSource *event_source,
XEvent *xevent)
{
GdkEvent *event = gdk_event_new (GDK_NOTHING);
GdkFilterReturn result = GDK_FILTER_CONTINUE;
GdkEventTranslator *event_translator;
GdkWindow *filter_window;
Display *dpy;
dpy = GDK_DISPLAY_XDISPLAY (event_source->display);
#ifdef HAVE_XGENERICEVENTS
/* Get cookie data here so it's available
* to every event translator and event filter.
*/
if (xevent->type == GenericEvent)
XGetEventData (dpy, &xevent->xcookie);
#endif
filter_window = gdk_event_source_get_filter_window (event_source, xevent,
&event_translator);
if (filter_window)
event->any.window = g_object_ref (filter_window);
/* Run default filters */
if (_gdk_default_filters)
{
/* Apply global filters */
result = gdk_event_apply_filters (xevent, event, NULL);
}
if (result == GDK_FILTER_CONTINUE &&
filter_window && filter_window->filters)
{
/* Apply per-window filters */
result = gdk_event_apply_filters (xevent, event, filter_window);
}
if (result != GDK_FILTER_CONTINUE)
{
#ifdef HAVE_XGENERICEVENTS
if (xevent->type == GenericEvent)
XFreeEventData (dpy, &xevent->xcookie);
#endif
if (result == GDK_FILTER_REMOVE)
{
gdk_event_free (event);
return NULL;
}
else /* GDK_FILTER_TRANSLATE */
return event;
}
gdk_event_free (event);
event = NULL;
if (event_translator)
{
/* Event translator was gotten before in get_filter_window() */
event = _gdk_x11_event_translator_translate (event_translator,
event_source->display,
xevent);
}
else
{
GList *list = event_source->translators;
while (list && !event)
{
GdkEventTranslator *translator = list->data;
list = list->next;
event = _gdk_x11_event_translator_translate (translator,
event_source->display,
xevent);
}
}
if (event &&
(event->type == GDK_ENTER_NOTIFY ||
event->type == GDK_LEAVE_NOTIFY) &&
event->crossing.window != NULL)
{
/* Handle focusing (in the case where no window manager is running */
handle_focus_change (&event->crossing);
}
#ifdef HAVE_XGENERICEVENTS
if (xevent->type == GenericEvent)
XFreeEventData (dpy, &xevent->xcookie);
#endif
return event;
}
static gboolean
gdk_check_xpending (GdkDisplay *display)
{
return XPending (GDK_DISPLAY_XDISPLAY (display));
}
static gboolean
gdk_event_source_prepare (GSource *source,
gint *timeout)
{
GdkDisplay *display = ((GdkEventSource*) source)->display;
gboolean retval;
gdk_threads_enter ();
*timeout = -1;
if (display->event_pause_count > 0)
retval = _gdk_event_queue_find_first (display) != NULL;
else
retval = (_gdk_event_queue_find_first (display) != NULL ||
gdk_check_xpending (display));
gdk_threads_leave ();
return retval;
}
static gboolean
gdk_event_source_check (GSource *source)
{
GdkEventSource *event_source = (GdkEventSource*) source;
gboolean retval;
gdk_threads_enter ();
if (event_source->display->event_pause_count > 0)
retval = _gdk_event_queue_find_first (event_source->display) != NULL;
else if (event_source->event_poll_fd.revents & G_IO_IN)
retval = (_gdk_event_queue_find_first (event_source->display) != NULL ||
gdk_check_xpending (event_source->display));
else
retval = FALSE;
gdk_threads_leave ();
return retval;
}
void
_gdk_x11_display_queue_events (GdkDisplay *display)
{
GdkEvent *event;
XEvent xevent;
Display *xdisplay = GDK_DISPLAY_XDISPLAY (display);
GdkEventSource *event_source;
GdkX11Display *display_x11;
display_x11 = GDK_X11_DISPLAY (display);
event_source = (GdkEventSource *) display_x11->event_source;
while (!_gdk_event_queue_find_first (display) && XPending (xdisplay))
{
XNextEvent (xdisplay, &xevent);
switch (xevent.type)
{
case KeyPress:
case KeyRelease:
break;
default:
if (XFilterEvent (&xevent, None))
continue;
}
event = gdk_event_source_translate_event (event_source, &xevent);
if (event)
{
GList *node;
node = _gdk_event_queue_append (display, event);
_gdk_windowing_got_event (display, node, event, xevent.xany.serial);
}
}
}
static gboolean
gdk_event_source_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
GdkDisplay *display = ((GdkEventSource*) source)->display;
GdkEvent *event;
gdk_threads_enter ();
event = gdk_display_get_event (display);
if (event)
{
_gdk_event_emit (event);
gdk_event_free (event);
}
gdk_threads_leave ();
return TRUE;
}
static void
gdk_event_source_finalize (GSource *source)
{
GdkEventSource *event_source = (GdkEventSource *)source;
g_list_free (event_source->translators);
event_source->translators = NULL;
event_sources = g_list_remove (event_sources, source);
}
GSource *
gdk_x11_event_source_new (GdkDisplay *display)
{
GSource *source;
GdkEventSource *event_source;
GdkX11Display *display_x11;
int connection_number;
char *name;
source = g_source_new (&event_funcs, sizeof (GdkEventSource));
name = g_strdup_printf ("GDK X11 Event source (%s)",
gdk_display_get_name (display));
g_source_set_name (source, name);
g_free (name);
event_source = (GdkEventSource *) source;
event_source->display = display;
display_x11 = GDK_X11_DISPLAY (display);
connection_number = ConnectionNumber (display_x11->xdisplay);
event_source->event_poll_fd.fd = connection_number;
event_source->event_poll_fd.events = G_IO_IN;
g_source_add_poll (source, &event_source->event_poll_fd);
g_source_set_priority (source, GDK_PRIORITY_EVENTS);
g_source_set_can_recurse (source, TRUE);
g_source_attach (source, NULL);
event_sources = g_list_prepend (event_sources, source);
return source;
}
void
gdk_x11_event_source_add_translator (GdkEventSource *source,
GdkEventTranslator *translator)
{
g_return_if_fail (GDK_IS_EVENT_TRANSLATOR (translator));
source->translators = g_list_append (source->translators, translator);
}
void
gdk_x11_event_source_select_events (GdkEventSource *source,
Window window,
GdkEventMask event_mask,
unsigned int extra_x_mask)
{
unsigned int xmask = extra_x_mask;
GList *list;
gint i;
list = source->translators;
while (list)
{
GdkEventTranslator *translator = list->data;
GdkEventMask translator_mask, mask;
translator_mask = _gdk_x11_event_translator_get_handled_events (translator);
mask = event_mask & translator_mask;
if (mask != 0)
{
_gdk_x11_event_translator_select_window_events (translator, window, mask);
event_mask &= ~mask;
}
list = list->next;
}
for (i = 0; i < _gdk_x11_event_mask_table_size; i++)
{
if (event_mask & (1 << (i + 1)))
xmask |= _gdk_x11_event_mask_table[i];
}
XSelectInput (GDK_DISPLAY_XDISPLAY (source->display), window, xmask);
}