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authorOwen W. Taylor <otaylor@fishsoup.net>2010-06-09 19:38:35 -0400
committerThomas Thurman <tthurman@gnome.org>2010-09-15 07:59:16 -0400
commit4e6a3abe146ea858b0097d230fbdfefd1e1cc14e (patch)
tree1ba784afe8fbea3bac24aa09329ee246e1844433 /src/ui
parent61a34a9700adf540c4e1d1dbbf491984bfc8b2d3 (diff)
downloadmetacity-4e6a3abe146ea858b0097d230fbdfefd1e1cc14e.tar.gz
metacity-4e6a3abe146ea858b0097d230fbdfefd1e1cc14e.tar.bz2
Stop confusing GDK's grab tracking
With client side windows, mixing GDK event delivery with explicit calls to XUngrabPointer() can result in GDK losing button release events it expects to get. This means that GDK thinks there is an implicit grab in effect when there is none and send events to the wrong window. Avoid this by bypassing GDK's event handling for most mouse events. We do a simplified conversion of the X event into a GdkEvent and send it to directly to libgtk for delivery. We make an exception when a GDK grab is already in effect - this is needed for the correct operation of menus. http://bugzilla.gnome.org/show_bug.cgi?id=599181
Diffstat (limited to 'src/ui')
-rw-r--r--src/ui/ui.c156
1 files changed, 152 insertions, 4 deletions
diff --git a/src/ui/ui.c b/src/ui/ui.c
index 6601b5c..54fa26f 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -46,6 +46,13 @@ struct _MetaUI
Display *xdisplay;
Screen *xscreen;
MetaFrames *frames;
+
+ /* For double-click tracking */
+ guint button_click_number;
+ Window button_click_window;
+ int button_click_x;
+ int button_click_y;
+ guint32 button_click_time;
};
void
@@ -63,6 +70,136 @@ meta_ui_get_display (void)
return gdk_display;
}
+/* We do some of our event handling in frames.c, which expects
+ * GDK events delivered by GTK+. However, since the transition to
+ * client side windows, we can't let GDK see button events, since the
+ * client-side tracking of implicit and explicit grabs it does will
+ * get confused by our direct use of X grabs in the core code.
+ *
+ * So we do a very minimal GDK => GTK event conversion here and send on the
+ * events we care about, and then filter them out so they don't go
+ * through the normal GDK event handling.
+ *
+ * To reduce the amount of code, the only events fields filled out
+ * below are the ones that frames.c uses. If frames.c is modified to
+ * use more fields, more fields need to be filled out below.
+ */
+
+static gboolean
+maybe_redirect_mouse_event (XEvent *xevent)
+{
+ GdkDisplay *gdisplay;
+ MetaUI *ui;
+ GdkEvent gevent;
+ GdkWindow *gdk_window;
+ Window window;
+
+ switch (xevent->type)
+ {
+ case ButtonPress:
+ case ButtonRelease:
+ window = xevent->xbutton.window;
+ break;
+ case MotionNotify:
+ window = xevent->xmotion.window;
+ break;
+ case EnterNotify:
+ case LeaveNotify:
+ window = xevent->xcrossing.window;
+ break;
+ default:
+ return FALSE;
+ }
+
+ gdisplay = gdk_x11_lookup_xdisplay (xevent->xany.display);
+ ui = g_object_get_data (G_OBJECT (gdisplay), "meta-ui");
+ if (!ui)
+ return FALSE;
+
+ gdk_window = gdk_window_lookup_for_display (gdisplay, window);
+ if (gdk_window == NULL)
+ return FALSE;
+
+ /* If GDK already thinks it has a grab, we better let it see events; this
+ * is the menu-navigation case and events need to get sent to the appropriate
+ * (client-side) subwindow for individual menu items.
+ */
+ if (gdk_display_pointer_is_grabbed (gdisplay))
+ return FALSE;
+
+ memset (&gevent, 0, sizeof (gevent));
+
+ switch (xevent->type)
+ {
+ case ButtonPress:
+ case ButtonRelease:
+ if (xevent->type == ButtonPress)
+ {
+ GtkSettings *settings = gtk_settings_get_default ();
+ int double_click_time;
+ int double_click_distance;
+
+ g_object_get (settings,
+ "gtk-double-click-time", &double_click_time,
+ "gtk-double-click-distance", &double_click_distance,
+ NULL);
+
+ if (xevent->xbutton.button == ui->button_click_number &&
+ xevent->xbutton.window == ui->button_click_window &&
+ xevent->xbutton.time < ui->button_click_time + double_click_time &&
+ ABS (xevent->xbutton.x - ui->button_click_x) <= double_click_distance &&
+ ABS (xevent->xbutton.y - ui->button_click_y) <= double_click_distance)
+ {
+ gevent.button.type = GDK_2BUTTON_PRESS;
+
+ ui->button_click_number = 0;
+ }
+ else
+ {
+ gevent.button.type = GDK_BUTTON_PRESS;
+ ui->button_click_number = xevent->xbutton.button;
+ ui->button_click_window = xevent->xbutton.window;
+ ui->button_click_time = xevent->xbutton.time;
+ ui->button_click_x = xevent->xbutton.x;
+ ui->button_click_y = xevent->xbutton.y;
+ }
+ }
+ else
+ {
+ gevent.button.type = GDK_BUTTON_RELEASE;
+ }
+
+ gevent.button.window = gdk_window;
+ gevent.button.button = xevent->xbutton.button;
+ gevent.button.time = xevent->xbutton.time;
+ gevent.button.x = xevent->xbutton.x;
+ gevent.button.y = xevent->xbutton.y;
+ gevent.button.x_root = xevent->xbutton.x_root;
+ gevent.button.y_root = xevent->xbutton.y_root;
+
+ break;
+ case MotionNotify:
+ gevent.motion.type = GDK_MOTION_NOTIFY;
+ gevent.motion.window = gdk_window;
+ break;
+ case EnterNotify:
+ case LeaveNotify:
+ gevent.crossing.type = xevent->type == EnterNotify ? GDK_ENTER_NOTIFY : GDK_LEAVE_NOTIFY;
+ gevent.crossing.window = gdk_window;
+ gevent.crossing.x = xevent->xcrossing.x;
+ gevent.crossing.y = xevent->xcrossing.y;
+ break;
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+
+ /* If we've gotten here, we've filled in the gdk_event and should send it on */
+ gtk_main_do_event (&gevent);
+
+ return TRUE;
+}
+
typedef struct _EventFunc EventFunc;
struct _EventFunc
@@ -80,7 +217,8 @@ filter_func (GdkXEvent *xevent,
{
g_return_val_if_fail (ef != NULL, GDK_FILTER_CONTINUE);
- if ((* ef->func) (xevent, ef->data))
+ if ((* ef->func) (xevent, ef->data) ||
+ maybe_redirect_mouse_event (xevent))
return GDK_FILTER_REMOVE;
else
return GDK_FILTER_CONTINUE;
@@ -118,24 +256,34 @@ MetaUI*
meta_ui_new (Display *xdisplay,
Screen *screen)
{
+ GdkDisplay *gdisplay;
MetaUI *ui;
- ui = g_new (MetaUI, 1);
+ ui = g_new0 (MetaUI, 1);
ui->xdisplay = xdisplay;
ui->xscreen = screen;
- g_assert (xdisplay == gdk_display);
+ gdisplay = gdk_x11_lookup_xdisplay (xdisplay);
+ g_assert (gdisplay == gdk_display_get_default ());
+
ui->frames = meta_frames_new (XScreenNumberOfScreen (screen));
gtk_widget_realize (GTK_WIDGET (ui->frames));
-
+
+ g_object_set_data (G_OBJECT (gdisplay), "meta-ui", ui);
+
return ui;
}
void
meta_ui_free (MetaUI *ui)
{
+ GdkDisplay *gdisplay;
+
gtk_widget_destroy (GTK_WIDGET (ui->frames));
+ gdisplay = gdk_x11_lookup_xdisplay (ui->xdisplay);
+ g_object_set_data (G_OBJECT (gdisplay), "meta-ui", NULL);
+
g_free (ui);
}