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gtk2/gdk/x11/gdkeventsource.c
Emmanuele Bassi f28aa1ba02 Restructure the GdkEvent type hierarchy 
GdkEvent has been a "I-can't-believe-this-is-not-OOP" type for ages,
using a union of sub-types. This has always been problematic when it
comes to implementing accessor functions: either you get generic API
that takes a GdkEvent and uses a massive switch() to determine which
event types have the data you're looking for; or you create namespaced
accessors, but break language bindings horribly, as boxed types cannot
have derived types.

The recent conversion of GskRenderNode (which had similar issues) to
GTypeInstance, and the fact that GdkEvent is now a completely opaque
type, provide us with the chance of moving GdkEvent to GTypeInstance,
and have sub-types for GdkEvent.

The change from boxed type to GTypeInstance is pretty small, all things
considered, but ends up cascading to a larger commit, as we still have
backends and code in GTK trying to access GdkEvent structures directly.
Additionally, the naming of the public getter functions requires
renaming all the data structures to conform to the namespace/type-name
pattern.
2020-04-16 19:54:02 +01:00

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/* 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 "gdksurface-x11.h"
#include "gdkprivate-x11.h"
#include "gdkdisplay-x11.h"
#include "xsettings-client.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);
static GQuark quark_needs_enter = 0;
#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 GdkSurface *
gdk_event_source_get_filter_surface (GdkEventSource *event_source,
const XEvent *xevent,
GdkEventTranslator **event_translator)
{
GList *list = event_source->translators;
GdkSurface *surface;
*event_translator = NULL;
while (list)
{
GdkEventTranslator *translator = list->data;
list = list->next;
surface = _gdk_x11_event_translator_get_surface (translator,
event_source->display,
xevent);
if (surface)
{
*event_translator = translator;
return surface;
}
}
surface = gdk_x11_surface_lookup_for_display (event_source->display,
xevent->xany.window);
return surface;
}
static void
handle_focus_change (GdkEvent *event)
{
GdkToplevelX11 *toplevel;
GdkX11Screen *x11_screen;
gboolean focus_in, had_focus;
toplevel = _gdk_x11_surface_get_toplevel (gdk_event_get_surface (event));
x11_screen = GDK_X11_SCREEN (GDK_SURFACE_SCREEN (gdk_event_get_surface (event)));
focus_in = (gdk_event_get_event_type (event) == GDK_ENTER_NOTIFY);
if (x11_screen->wmspec_check_window)
return;
if (!toplevel || gdk_crossing_event_get_detail (event) == GDK_NOTIFY_INFERIOR)
return;
toplevel->has_pointer = focus_in;
if (!gdk_crossing_event_get_focus (event) || 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_focus_event_new (gdk_event_get_surface (event),
gdk_event_get_device (event),
gdk_event_get_source_device (event),
focus_in);
gdk_display_put_event (gdk_event_get_display (event), focus_event);
gdk_event_unref (focus_event);
}
}
static GdkEvent *
create_synth_crossing_event (GdkEventType evtype,
GdkCrossingMode mode,
GdkEvent *real_event)
{
GdkEvent *event;
gdouble x, y;
g_assert (evtype == GDK_ENTER_NOTIFY || evtype == GDK_LEAVE_NOTIFY);
gdk_event_get_position (real_event, &x, &y);
event = gdk_crossing_event_new (evtype,
gdk_event_get_surface (real_event),
gdk_event_get_device (real_event),
gdk_event_get_source_device (real_event),
gdk_event_get_time (real_event),
gdk_event_get_modifier_state (real_event),
x, y,
mode,
GDK_NOTIFY_ANCESTOR);
return event;
}
static void
handle_touch_synthetic_crossing (GdkEvent *event)
{
GdkEventType evtype = gdk_event_get_event_type (event);
GdkDevice *device = gdk_event_get_device (event);
GdkEvent *crossing = NULL;
GdkSeat *seat = gdk_device_get_seat (device);
gboolean needs_enter, set_needs_enter = FALSE;
if (quark_needs_enter == 0)
quark_needs_enter = g_quark_from_static_string ("gdk-x11-needs-enter-after-touch-end");
needs_enter =
GPOINTER_TO_UINT (g_object_get_qdata (G_OBJECT (seat), quark_needs_enter));
if (evtype == GDK_MOTION_NOTIFY && needs_enter)
{
set_needs_enter = FALSE;
crossing = create_synth_crossing_event (GDK_ENTER_NOTIFY,
GDK_CROSSING_DEVICE_SWITCH,
event);
}
else if (evtype == GDK_TOUCH_BEGIN && needs_enter &&
gdk_event_get_pointer_emulated (event))
{
set_needs_enter = FALSE;
crossing = create_synth_crossing_event (GDK_ENTER_NOTIFY,
GDK_CROSSING_TOUCH_BEGIN,
event);
}
else if (evtype == GDK_TOUCH_END &&
gdk_event_get_pointer_emulated (event))
{
set_needs_enter = TRUE;
crossing = create_synth_crossing_event (GDK_LEAVE_NOTIFY,
GDK_CROSSING_TOUCH_END,
event);
}
else if (evtype == GDK_ENTER_NOTIFY ||
evtype == GDK_LEAVE_NOTIFY)
{
/* We are receiving or shall receive a real crossing event,
* turn this off.
*/
set_needs_enter = FALSE;
}
else
return;
if (needs_enter != set_needs_enter)
{
if (!set_needs_enter)
g_object_steal_qdata (G_OBJECT (seat), quark_needs_enter);
else
g_object_set_qdata (G_OBJECT (seat), quark_needs_enter,
GUINT_TO_POINTER (TRUE));
}
if (crossing)
{
gdk_display_put_event (gdk_device_get_display (device), crossing);
gdk_event_unref (crossing);
}
}
static GdkEvent *
gdk_event_source_translate_event (GdkX11Display *x11_display,
const XEvent *xevent)
{
GdkEventSource *event_source = (GdkEventSource *) x11_display->event_source;
GdkEvent *event;
GdkFilterReturn result = GDK_FILTER_CONTINUE;
GdkDisplay *display = GDK_DISPLAY (x11_display);
GdkEventTranslator *event_translator;
GdkSurface *filter_surface;
Display *dpy;
GdkX11Screen *x11_screen;
gpointer cache;
x11_screen = GDK_X11_DISPLAY (display)->screen;
dpy = GDK_DISPLAY_XDISPLAY (display);
event = NULL;
filter_surface = gdk_event_source_get_filter_surface (event_source, xevent,
&event_translator);
/* apply XSettings filters */
if (xevent->xany.window == XRootWindow (dpy, 0))
result = gdk_xsettings_root_window_filter (xevent, x11_screen);
if (result == GDK_FILTER_CONTINUE &&
xevent->xany.window == x11_screen->xsettings_manager_window)
result = gdk_xsettings_manager_window_filter (xevent, x11_screen);
cache = gdk_surface_cache_get (display);
if (cache)
{
if (result == GDK_FILTER_CONTINUE)
result = gdk_surface_cache_shape_filter (xevent, cache);
if (result == GDK_FILTER_CONTINUE &&
xevent->xany.window == XRootWindow (dpy, 0))
result = gdk_surface_cache_filter (xevent, cache);
}
if (result == GDK_FILTER_CONTINUE)
result = _gdk_wm_protocols_filter (xevent, filter_surface, &event, NULL);
if (result == GDK_FILTER_CONTINUE &&
gdk_x11_drop_filter (filter_surface, xevent))
result = GDK_FILTER_REMOVE;
if (result != GDK_FILTER_CONTINUE)
{
if (result == GDK_FILTER_REMOVE)
return NULL;
else /* GDK_FILTER_TRANSLATE */
return event;
}
if (event_translator)
{
/* Event translator was gotten before in get_filter_window() */
event = _gdk_x11_event_translator_translate (event_translator,
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,
display,
xevent);
}
}
if (event)
{
GdkEventType evtype = gdk_event_get_event_type (event);
if ((evtype == GDK_ENTER_NOTIFY ||
evtype == GDK_LEAVE_NOTIFY) &&
gdk_event_get_surface (event) != NULL)
{
/* Handle focusing (in the case where no window manager is running */
handle_focus_change (event);
}
if (evtype == GDK_TOUCH_BEGIN ||
evtype == GDK_TOUCH_END ||
evtype == GDK_MOTION_NOTIFY ||
evtype == GDK_ENTER_NOTIFY ||
evtype == GDK_LEAVE_NOTIFY)
{
handle_touch_synthetic_crossing (event);
}
}
return event;
}
gboolean
gdk_event_source_xevent (GdkX11Display *x11_display,
const XEvent *xevent)
{
GdkDisplay *display = GDK_DISPLAY (x11_display);
GdkEvent *event;
GList *node;
event = gdk_event_source_translate_event (x11_display, xevent);
if (event == NULL)
return FALSE;
node = _gdk_event_queue_append (display, event);
_gdk_windowing_got_event (display, node, event, xevent->xany.serial);
return TRUE;
}
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;
*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));
return retval;
}
static gboolean
gdk_event_source_check (GSource *source)
{
GdkEventSource *event_source = (GdkEventSource*) source;
gboolean retval;
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;
return retval;
}
void
_gdk_x11_display_queue_events (GdkDisplay *display)
{
Display *xdisplay = GDK_DISPLAY_XDISPLAY (display);
XEvent xevent;
gboolean unused;
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;
}
#ifdef HAVE_XGENERICEVENTS
/* Get cookie data here so it's available
* to every event translator and event filter.
*/
if (xevent.type == GenericEvent)
XGetEventData (xdisplay, &xevent.xcookie);
#endif
g_signal_emit_by_name (display, "xevent", &xevent, &unused);
#ifdef HAVE_XGENERICEVENTS
if (xevent.type == GenericEvent)
XFreeEventData (xdisplay, &xevent.xcookie);
#endif
}
}
static gboolean
gdk_event_source_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
GdkDisplay *display = ((GdkEventSource*) source)->display;
GdkEvent *event;
event = gdk_display_get_event (display);
if (event)
{
_gdk_event_emit (event);
gdk_event_unref (event);
}
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;
}
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);
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_surface_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);
}
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