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x11: Refactor xevent filtering some more

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We now have a GdkX11Display::xevent signal that gets emitted for every
XEvent and allows you to interrupt processing via TRUE/FALSE return
values.
These return values to correspond to GDK_FILTER_REMOVE and
GDK_FILTER_CONTINUE respectively.

The GDK_FILTER_TRANSLATE case from gdk_window_add_filter() is now meant
to be handled via gdk_display_put_event().
This commit is contained in:
Benjamin Otte 2017-12-13 01:53:17 +01:00
parent 76b93f5598
commit fb0fdddd76
8 changed files with 108 additions and 117 deletions
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2
gdk/gdkmarshalers.list
View File

@ -1,2 +1,2 @@
BOXED:POINTER
BOOLEAN:POINTER
VOID:POINTER,POINTER,BOOLEAN,BOOLEAN

42
gdk/x11/gdkclipboard-x11.c
View File

@ -372,10 +372,10 @@ gdk_x11_clipboard_claim_remote (GdkX11Clipboard *cb,
gdk_x11_clipboard_request_targets (cb);
}
static GdkEvent *
gdk_x11_clipboard_translate_event (GdkDisplay *display,
const XEvent *xevent,
gpointer data)
static gboolean
gdk_x11_clipboard_xevent (GdkDisplay *display,
const XEvent *xevent,
gpointer data)
{
GdkX11Clipboard *cb = GDK_X11_CLIPBOARD (data);
Window xwindow;
@ -383,41 +383,41 @@ gdk_x11_clipboard_translate_event (GdkDisplay *display,
xwindow = GDK_X11_DISPLAY (display)->leader_window;
if (xevent->xany.window != xwindow)
return NULL;
return FALSE;
switch (xevent->type)
{
case SelectionClear:
if (xevent->xselectionclear.selection != cb->xselection)
return NULL;
return FALSE;
if (xevent->xselectionclear.time < cb->timestamp)
{
GDK_NOTE(CLIPBOARD, g_printerr ("%s: ignoring SelectionClear with too old timestamp (%lu vs %lu)\n",
cb->selection, xevent->xselectionclear.time, cb->timestamp));
return NULL;
return FALSE;
}
GDK_NOTE(CLIPBOARD, g_printerr ("%s: got SelectionClear\n", cb->selection));
gdk_x11_clipboard_claim_remote (cb, xevent->xselectionclear.time);
return gdk_event_new (GDK_NOTHING);
return TRUE;
case SelectionNotify:
/* This code only checks clipboard manager replies, so... */
if (!g_str_equal (cb->selection, "CLIPBOARD"))
return NULL;
return FALSE;
/* selection is not for us */
if (xevent->xselection.selection != gdk_x11_get_xatom_by_name_for_display (display, "CLIPBOARD_MANAGER") ||
xevent->xselection.target != gdk_x11_get_xatom_by_name_for_display (display, "SAVE_TARGETS"))
return NULL;
return FALSE;
/* We already received a selectionNotify before */
if (cb->store_task == NULL)
{
GDK_NOTE(CLIPBOARD, g_printerr ("%s: got SelectionNotify for nonexisting task?!\n",
cb->selection));
return NULL;
return FALSE;
}
GDK_NOTE(CLIPBOARD, g_printerr ("%s: got SelectionNotify for store task\n",
@ -430,14 +430,14 @@ gdk_x11_clipboard_translate_event (GdkDisplay *display,
_("Clipboard manager could not store selection."));
g_clear_object (&cb->store_task);
return NULL;
return FALSE;
case SelectionRequest:
{
const char *target, *property;
if (xevent->xselectionrequest.selection != cb->xselection)
return NULL;
return FALSE;
target = gdk_x11_get_xatom_name_for_display (display, xevent->xselectionrequest.target);
if (xevent->xselectionrequest.property == None)
@ -449,13 +449,13 @@ gdk_x11_clipboard_translate_event (GdkDisplay *display,
{
GDK_NOTE(CLIPBOARD, g_printerr ("%s: got SelectionRequest for %s @ %s even though we don't own the selection, huh?\n",
cb->selection, target, property));
return gdk_event_new (GDK_NOTHING);
return TRUE;
}
if (xevent->xselectionrequest.requestor == None)
{
GDK_NOTE(CLIPBOARD, g_printerr ("%s: got SelectionRequest for %s @ %s with NULL window, ignoring\n",
cb->selection, target, property));
return gdk_event_new (GDK_NOTHING);
return TRUE;
}
GDK_NOTE(CLIPBOARD, g_printerr ("%s: got SelectionRequest for %s @ %s\n",
@ -471,7 +471,7 @@ gdk_x11_clipboard_translate_event (GdkDisplay *display,
xevent->xselectionrequest.time,
gdk_x11_clipboard_default_output_handler,
cb);
return gdk_event_new (GDK_NOTHING);
return TRUE;
}
default:
@ -481,13 +481,13 @@ gdk_x11_clipboard_translate_event (GdkDisplay *display,
XFixesSelectionNotifyEvent *sn = (XFixesSelectionNotifyEvent *) xevent;
if (sn->selection != cb->xselection)
return NULL;
return FALSE;
if (sn->owner == GDK_X11_DISPLAY (display)->leader_window)
{
GDK_NOTE(CLIPBOARD, g_printerr ("%s: Ignoring XFixesSelectionNotify for ourselves\n",
cb->selection));
return NULL;
return FALSE;
}
GDK_NOTE(CLIPBOARD, g_printerr ("%s: Received XFixesSelectionNotify, claiming selection\n",
@ -496,7 +496,7 @@ gdk_x11_clipboard_translate_event (GdkDisplay *display,
gdk_x11_clipboard_claim_remote (cb, sn->selection_timestamp);
}
#endif
return NULL;
return FALSE;
}
}
@ -506,7 +506,7 @@ gdk_x11_clipboard_finalize (GObject *object)
GdkX11Clipboard *cb = GDK_X11_CLIPBOARD (object);
g_signal_handlers_disconnect_by_func (gdk_clipboard_get_display (GDK_CLIPBOARD (cb)),
gdk_x11_clipboard_translate_event,
gdk_x11_clipboard_xevent,
cb);
g_free (cb->selection);
@ -814,7 +814,7 @@ gdk_x11_clipboard_new (GdkDisplay *display,
cb->xselection = gdk_x11_get_xatom_by_name_for_display (display, selection);
gdk_display_request_selection_notification (display, gdk_atom_intern (selection, FALSE));
g_signal_connect (display, "translate-event", G_CALLBACK (gdk_x11_clipboard_translate_event), cb);
g_signal_connect (display, "xevent", G_CALLBACK (gdk_x11_clipboard_xevent), cb);
gdk_x11_clipboard_claim_remote (cb, CurrentTime);
return GDK_CLIPBOARD (cb);

75
gdk/x11/gdkdisplay-x11.c
View File

@ -77,7 +77,7 @@
#endif
enum {
TRANSLATE_EVENT,
XEVENT,
LAST_SIGNAL
};
@ -3164,21 +3164,19 @@ gdk_x11_display_get_last_seen_time (GdkDisplay *display)
}
static gboolean
gdk_x11_display_translate_event_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer dummy)
gdk_boolean_handled_accumulator (GSignalInvocationHint *ihint,
GValue *return_accu,
const GValue *handler_return,
gpointer dummy)
{
GdkEvent *event;
gboolean continue_emission;
gboolean signal_handled;
event = g_value_get_boxed (handler_return);
if (event == NULL)
return TRUE;
signal_handled = g_value_get_boolean (handler_return);
g_value_set_boolean (return_accu, signal_handled);
continue_emission = !signal_handled;
if (event->type != GDK_NOTHING)
g_value_set_boxed (return_accu, event);
return FALSE;
return continue_emission;
}
static void
@ -3241,53 +3239,40 @@ gdk_x11_display_class_init (GdkX11DisplayClass * class)
display_class->get_last_seen_time = gdk_x11_display_get_last_seen_time;
display_class->set_cursor_theme = gdk_x11_display_set_cursor_theme;
class->translate_event = gdk_event_source_translate_event;
class->xevent = gdk_event_source_xevent;
/**
* GdkX11Display::translate-event:
* GdkX11Display::xevent:
* @display: the object on which the signal is emitted
* @xevent: a pointer to the XEvent to process
*
* The ::translate-event signal is a low level signal that is emitted
* whenever an XEvent needs to be translated to a #GdkEvent.
* The ::xevent signal is a low level signal that is emitted
* whenever an XEvent has been received.
*
* Handlers to this signal can return one of 3 possible values:
*
* 1. %NULL
*
* This will result in the next handler being invoked.
* When handlers to this signal return %TRUE, no other handlers will be
* invoked. In particular, the default handler for this function is
* GDK's own event handling mechanism, so by returning %TRUE for an event
* that GDK expects to translate, you may break GDK and/or GTK+ in
* interesting ways. You have been warned.
*
* 2. a #GdkEvent
*
* This will result in no further handlers being invoked and the returned
* event being enqueued for further processing by GDK.
*
* 3. gdk_event_new(GDK_NOTHING)
*
* If a handler returns an event of type GDK_NOTHING, the event will be
* discarded and no further handlers will be invoked. Use this if your
* function completely handled the @xevent.
*
* Note that the default handler for this function is GDK's own event
* translation mechanism, so by translating an event that GDK expects to
* translate, you may break GDK and/or GTK+ in interesting ways, so you
* have to know what you're doing.
* If you want this signal handler to queue a #GdkEvent, you can use
* gdk_display_put_event().
*
* If you are interested in X GenericEvents, bear in mind that
* XGetEventData() has been already called on the event, and
* XFreeEventData() will be called afterwards.
*
* Returns: The translated #GdkEvent or %NULL to invoke further handlers to
* translate the event.
* Returns: %TRUE to stop other handlers from being invoked for the event.
* %FALSE to propagate the event further.
*/
signals[TRANSLATE_EVENT] =
g_signal_new (g_intern_static_string ("translate-event"),
signals[XEVENT] =
g_signal_new (g_intern_static_string ("xevent"),
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GdkX11DisplayClass, translate_event),
gdk_x11_display_translate_event_accumulator, NULL,
_gdk_marshal_BOXED__POINTER,
GDK_TYPE_EVENT, 1, G_TYPE_POINTER);
G_STRUCT_OFFSET (GdkX11DisplayClass, xevent),
gdk_boolean_handled_accumulator, NULL,
_gdk_marshal_BOOLEAN__POINTER,
G_TYPE_BOOLEAN, 1, G_TYPE_POINTER);
_gdk_x11_windowing_init ();
}

2
gdk/x11/gdkdisplay-x11.h
View File

@ -168,7 +168,7 @@ struct _GdkX11DisplayClass
{
GdkDisplayClass parent_class;
GdkEvent * (* translate_event) (GdkX11Display *display,
gboolean (* xevent) (GdkX11Display *display,
const XEvent *event);
};

38
gdk/x11/gdkeventsource.c
View File

@ -263,7 +263,7 @@ handle_touch_synthetic_crossing (GdkEvent *event)
}
}
GdkEvent *
static GdkEvent *
gdk_event_source_translate_event (GdkX11Display *x11_display,
const XEvent *xevent)
{
@ -378,6 +378,24 @@ gdk_event_source_translate_event (GdkX11Display *x11_display,
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)
{
@ -430,9 +448,9 @@ gdk_event_source_check (GSource *source)
void
_gdk_x11_display_queue_events (GdkDisplay *display)
{
GdkEvent *event;
XEvent xevent;
Display *xdisplay = GDK_DISPLAY_XDISPLAY (display);
XEvent xevent;
gboolean unused;
while (!_gdk_event_queue_find_first (display) && XPending (xdisplay))
{
@ -456,24 +474,12 @@ _gdk_x11_display_queue_events (GdkDisplay *display)
XGetEventData (xdisplay, &xevent.xcookie);
#endif
g_signal_emit_by_name (display, "translate-event", &xevent, &event);
g_signal_emit_by_name (display, "xevent", &xevent, &unused);
#ifdef HAVE_XGENERICEVENTS
if (xevent.type == GenericEvent)
XFreeEventData (xdisplay, &xevent.xcookie);
#endif
if (event && event->type == GDK_NOTHING)
{
gdk_event_free (event);
}
else if (event)
{
GList *node;
node = _gdk_event_queue_append (display, event);
_gdk_windowing_got_event (display, node, event, xevent.xany.serial);
}
}
}

2
gdk/x11/gdkeventsource.h
View File

@ -38,7 +38,7 @@ void gdk_x11_event_source_select_events (GdkEventSource *source,
GdkEventMask event_mask,
unsigned int extra_x_mask);
GdkEvent *gdk_event_source_translate_event (GdkX11Display *display,
gboolean gdk_event_source_xevent (GdkX11Display *x11_display,
const XEvent *xevent);

34
gdk/x11/gdkselectioninputstream-x11.c
View File

@ -54,10 +54,10 @@ struct GdkX11SelectionInputStreamPrivate {
G_DEFINE_TYPE_WITH_PRIVATE (GdkX11SelectionInputStream, gdk_x11_selection_input_stream, G_TYPE_INPUT_STREAM);
static GdkEvent *
gdk_x11_selection_input_stream_translate_event (GdkDisplay *display,
const XEvent *xevent,
gpointer data);
static gboolean
gdk_x11_selection_input_stream_xevent (GdkDisplay *display,
const XEvent *xevent,
gpointer data);
static gboolean
gdk_x11_selection_input_stream_has_data (GdkX11SelectionInputStream *stream)
@ -162,7 +162,7 @@ gdk_x11_selection_input_stream_complete (GdkX11SelectionInputStream *stream)
GDK_X11_DISPLAY (priv->display)->streams = g_slist_remove (GDK_X11_DISPLAY (priv->display)->streams, stream);
g_signal_handlers_disconnect_by_func (priv->display,
gdk_x11_selection_input_stream_translate_event,
gdk_x11_selection_input_stream_xevent,
stream);
g_object_unref (stream);
@ -378,10 +378,10 @@ err:
}
static GdkEvent *
gdk_x11_selection_input_stream_translate_event (GdkDisplay *display,
const XEvent *xevent,
gpointer data)
static gboolean
gdk_x11_selection_input_stream_xevent (GdkDisplay *display,
const XEvent *xevent,
gpointer data)
{
GdkX11SelectionInputStream *stream = GDK_X11_SELECTION_INPUT_STREAM (data);
GdkX11SelectionInputStreamPrivate *priv = gdk_x11_selection_input_stream_get_instance_private (stream);
@ -396,7 +396,7 @@ gdk_x11_selection_input_stream_translate_event (GdkDisplay *display,
if (xevent->xany.display != xdisplay ||
xevent->xany.window != xwindow)
return NULL;
return FALSE;
switch (xevent->type)
{
@ -404,7 +404,7 @@ gdk_x11_selection_input_stream_translate_event (GdkDisplay *display,
if (!priv->incr ||
xevent->xproperty.atom != priv->xproperty ||
xevent->xproperty.state != PropertyNewValue)
return NULL;
return FALSE;
bytes = get_selection_property (xdisplay, xwindow, xevent->xproperty.atom, &type, &format);
if (bytes == NULL)
@ -432,7 +432,7 @@ gdk_x11_selection_input_stream_translate_event (GdkDisplay *display,
XDeleteProperty (xdisplay, xwindow, xevent->xproperty.atom);
return NULL;
return FALSE;
case SelectionNotify:
{
@ -441,12 +441,12 @@ gdk_x11_selection_input_stream_translate_event (GdkDisplay *display,
/* selection is not for us */
if (priv->xselection != xevent->xselection.selection ||
priv->xtarget != xevent->xselection.target)
return NULL;
return FALSE;
/* We already received a selectionNotify before */
if (priv->pending_task == NULL ||
g_task_get_source_tag (priv->pending_task) != gdk_x11_selection_input_stream_new_async)
return NULL;
return FALSE;
GDK_NOTE(SELECTION, g_printerr ("%s:%s: got SelectionNotify\n", priv->selection, priv->target));
@ -498,10 +498,10 @@ gdk_x11_selection_input_stream_translate_event (GdkDisplay *display,
g_object_unref (task);
}
return gdk_event_new (GDK_NOTHING);
return TRUE;
default:
return NULL;
return FALSE;
}
}
@ -530,7 +530,7 @@ gdk_x11_selection_input_stream_new_async (GdkDisplay *display,
priv->property = g_strdup_printf ("GDK_SELECTION_%p", stream);
priv->xproperty = gdk_x11_get_xatom_by_name_for_display (display, priv->property);
g_signal_connect (display, "translate-event", G_CALLBACK (gdk_x11_selection_input_stream_translate_event), stream);
g_signal_connect (display, "xevent", G_CALLBACK (gdk_x11_selection_input_stream_xevent), stream);
XConvertSelection (GDK_DISPLAY_XDISPLAY (display),
priv->xselection,

30
gdk/x11/gdkselectionoutputstream-x11.c
View File

@ -147,10 +147,10 @@ gdk_x11_pending_selection_notify_send (GdkX11PendingSelectionNotify *notify,
}
}
static GdkEvent *
gdk_x11_selection_output_stream_translate_event (GdkDisplay *display,
const XEvent *xevent,
gpointer data);
static gboolean
gdk_x11_selection_output_stream_xevent (GdkDisplay *display,
const XEvent *xevent,
gpointer data);
static gboolean
gdk_x11_selection_output_stream_can_flush (GdkX11SelectionOutputStream *stream)
@ -493,7 +493,7 @@ gdk_x11_selection_output_stream_invoke_close (gpointer stream)
GDK_X11_DISPLAY (priv->display)->streams = g_slist_remove (GDK_X11_DISPLAY (priv->display)->streams, stream);
g_signal_handlers_disconnect_by_func (priv->display,
gdk_x11_selection_output_stream_translate_event,
gdk_x11_selection_output_stream_xevent,
stream);
return G_SOURCE_REMOVE;
@ -589,10 +589,10 @@ gdk_x11_selection_output_stream_init (GdkX11SelectionOutputStream *stream)
priv->data = g_byte_array_new ();
}
static GdkEvent *
gdk_x11_selection_output_stream_translate_event (GdkDisplay *display,
const XEvent *xevent,
gpointer data)
static gboolean
gdk_x11_selection_output_stream_xevent (GdkDisplay *display,
const XEvent *xevent,
gpointer data)
{
GdkX11SelectionOutputStream *stream = GDK_X11_SELECTION_OUTPUT_STREAM (data);
GdkX11SelectionOutputStreamPrivate *priv = gdk_x11_selection_output_stream_get_instance_private (stream);
@ -602,7 +602,7 @@ gdk_x11_selection_output_stream_translate_event (GdkDisplay *display,
if (xevent->xany.display != xdisplay ||
xevent->xany.window != priv->xwindow)
return NULL;
return FALSE;
switch (xevent->type)
{
@ -610,7 +610,7 @@ gdk_x11_selection_output_stream_translate_event (GdkDisplay *display,
if (!priv->incr ||
xevent->xproperty.atom != priv->xproperty ||
xevent->xproperty.state != PropertyDelete)
return NULL;
return FALSE;
GDK_NOTE(SELECTION, g_printerr ("%s:%s: got PropertyNotify Delete during INCR\n",
priv->selection, priv->target));
@ -618,10 +618,10 @@ gdk_x11_selection_output_stream_translate_event (GdkDisplay *display,
if (gdk_x11_selection_output_stream_needs_flush (stream) &
gdk_x11_selection_output_stream_can_flush (stream))
gdk_x11_selection_output_stream_perform_flush (stream);
return NULL;
return FALSE;
default:
return NULL;
return FALSE;
}
}
@ -658,8 +658,8 @@ gdk_x11_selection_output_stream_new (GdkDisplay *display,
priv->timestamp = timestamp;
g_signal_connect (display,
"translate-event",
G_CALLBACK (gdk_x11_selection_output_stream_translate_event),
"xevent",
G_CALLBACK (gdk_x11_selection_output_stream_xevent),
stream);
return G_OUTPUT_STREAM (stream);