Lazyle set the input focus (FS#804)

Instead of immediately setting the X11 input focus when client.focus is assigned
something, we now just remember that we'll have to do something later. The focus
is then set in the next prepare call by libev (= after the current main loop run
is done).

Signed-off-by: Uli Schlachter <psychon@znc.in>

event.h

@@ -29,6 +29,7 @@ awesome_refresh(void)
 {
     banning_refresh();
     stack_refresh();
+    client_focus_refresh();
     return xcb_flush(globalconf.connection);
 }
 

globalconf.h

@@ -85,6 +85,8 @@ typedef struct
     {
         /** Focused client */
         client_t *client;
+        /** Is there a focus change pending? */
+        bool need_update;
     } focus;
     /** Drawins */
     drawin_array_t drawins;

objects/client.c

@@ -188,6 +188,7 @@ static void
 client_unfocus_update(client_t *c)
 {
     globalconf.focus.client = NULL;
+    globalconf.focus.need_update = true;
 
     luaA_object_push(globalconf.L, c);
     luaA_object_emit_signal(globalconf.L, -1, "unfocus", 0);
@@ -200,15 +201,6 @@ client_unfocus_update(client_t *c)
 static void
 client_unfocus(client_t *c)
 {
-
-    xcb_window_t root_win = globalconf.screen->root;
-    /* Set focus on root window, so no events leak to the current window.
-     * This kind of inlines client_set_focus(), but a root window will never have
-     * the WM_TAKE_FOCUS protocol.
-     */
-    xcb_set_input_focus(globalconf.connection, XCB_INPUT_FOCUS_PARENT,
-                        root_win, globalconf.timestamp);
-
     client_unfocus_update(c);
 }
 
@@ -329,9 +321,21 @@ client_focus(client_t *c)
     if(!client_maybevisible(c, c->screen))
         return;
 
-    /* X11 doesn't let you focus a window that isn't viewable */
-    client_unban(c);
+    client_focus_update(c);
+    globalconf.focus.need_update = true;
+}
 
+void
+client_focus_refresh(void)
+{
+    client_t *c = globalconf.focus.client;
+
+    if(!globalconf.focus.need_update)
+        return;
+    globalconf.focus.need_update = false;
+
+    if(c)
+    {
         /* Sets focus on window - using xcb_set_input_focus or WM_TAKE_FOCUS */
         if(!c->nofocus)
             xcb_set_input_focus(globalconf.connection, XCB_INPUT_FOCUS_PARENT,
@@ -339,9 +343,11 @@ client_focus(client_t *c)
 
         if(client_hasproto(c, WM_TAKE_FOCUS))
             xwindow_takefocus(c->window);
-
-    if (!c->nofocus)
-        client_focus_update(c);
+    }
+    else
+        /* Nothing has the focus, set the focus to the root window */
+        xcb_set_input_focus(globalconf.connection, XCB_INPUT_FOCUS_PARENT,
+                            globalconf.screen->root, globalconf.timestamp);
 }
 
 static void

objects/client.h

@@ -145,6 +145,7 @@ void client_set_icon(lua_State *, int, int);
 void client_set_skip_taskbar(lua_State *, int, bool);
 void client_focus(client_t *);
 void client_focus_update(client_t *);
+void client_focus_refresh(void);
 bool client_hasproto(client_t *, xcb_atom_t);
 void client_ignore_enterleave_events(void);
 void client_restore_enterleave_events(void);