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wayland: Don't broadcast selection owner changes

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When receiving a selection or when a drag icon enter a window, it was
targeted at a specific window. Lets emit the GDK_OWNER_CHANGE event
only for this window, instead of broadcasting.

Broadcasting has some nasty side effects. For example, if there was n
GdkWindows, and one would for every "owner-change" signal handler
receive n signals about the owner being changed.

An example of where this went a bit out of hand was gnome-terminal,
which added one listener per terminal window. This meant that if
one had m number of terminal windows, each time any one would loose or
gain keyboard focus, O(m^2) owner-change events would be emitted.

https://bugzilla.gnome.org/show_bug.cgi?id=754158
This commit is contained in:
Jonas Ådahl 2015-08-27 14:59:45 +08:00
parent 9ad6ac0b43
commit d682aed550
1 changed files with 22 additions and 17 deletions
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39
gdk/wayland/gdkdevice-wayland.c
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@ -75,6 +75,7 @@ struct _GdkWaylandDeviceData
GdkModifierType button_modifiers;
GdkWindow *pointer_focus;
GdkWindow *keyboard_focus;
GdkAtom pending_selection;
struct wl_data_device *data_device;
double surface_x, surface_y;
uint32_t time;
@ -669,21 +670,6 @@ emit_selection_owner_change (GdkWindow *window,
gdk_event_free (event);
}
static void
emit_selection_owner_change_forall (GdkAtom atom)
{
GdkDisplay *display = gdk_display_get_default ();
GdkScreen *screen = GDK_WAYLAND_DISPLAY (display)->screen;
GList *windows, *l;
windows = gdk_screen_get_toplevel_windows (screen);
for (l = windows; l; l = l->next)
emit_selection_owner_change (l->data, atom);
g_list_free (windows);
}
static void
data_device_data_offer (void *data,
struct wl_data_device *data_device,
@ -744,7 +730,8 @@ data_device_enter (void *data,
GDK_CURRENT_TIME);
gdk_wayland_selection_set_offer (device->display, selection, offer);
emit_selection_owner_change_forall (selection);
emit_selection_owner_change (dest_window, selection);
}
static void
@ -827,7 +814,16 @@ data_device_selection (void *data,
selection = gdk_atom_intern_static_string ("CLIPBOARD");
gdk_wayland_selection_set_offer (device->display, selection, offer);
emit_selection_owner_change_forall (selection);
/* If we already have keyboard focus, the selection was targeted at the
* focused surface. If we don't we will receive keyboard focus directly after
* this, so lets wait and find out what window will get the focus before
* emitting the owner-changed event.
*/
if (device->keyboard_focus)
emit_selection_owner_change (device->keyboard_focus, selection);
else
device->pending_selection = selection;
}
static const struct wl_data_device_listener data_device_listener = {
@ -1163,6 +1159,13 @@ keyboard_handle_enter (void *data,
device, device->keyboard_focus));
_gdk_wayland_display_deliver_event (device->display, event);
if (device->pending_selection != GDK_NONE)
{
emit_selection_owner_change (device->keyboard_focus,
device->pending_selection);
device->pending_selection = GDK_NONE;
}
}
static void stop_key_repeat (GdkWaylandDeviceData *device);
@ -2231,6 +2234,8 @@ _gdk_wayland_device_manager_add_seat (GdkDeviceManager *device_manager,
device->foreign_dnd_window = create_foreign_dnd_window (display);
device->wl_seat = wl_seat;
device->pending_selection = GDK_NONE;
wl_seat_add_listener (device->wl_seat, &seat_listener, device);
wl_seat_set_user_data (device->wl_seat, device);