window: Split out preview_tile_mode

The existing semantics of the tile_mode property are terribly confusing,
as it depends on some other property whether it represents the requested
or current mode. Clear this up by just using separate variables for the
two. As it is unlikely that we will ever support more than one tile
preview, we can track the requested mode globally instead of adding
another per-window variable.

https://bugzilla.gnome.org/show_bug.cgi?id=645153

src/core/constraints.c

@@ -943,7 +943,7 @@ constrain_maximization (MetaWindow         *window,
   /* Calculate target_size = maximized size of (window + frame) */
   if (META_WINDOW_TILED_MAXIMIZED (window))
     {
-      meta_window_get_current_tile_area (window, &target_size);
+      meta_window_get_tile_area (window, window->tile_mode, &target_size);
     }
   else if (META_WINDOW_MAXIMIZED (window))
     {
@@ -1030,7 +1030,7 @@ constrain_tiling (MetaWindow         *window,
   /* Calculate target_size - as the tile previews need this as well, we
    * use an external function for the actual calculation
    */
-  meta_window_get_current_tile_area (window, &target_size);
+  meta_window_get_tile_area (window, window->tile_mode, &target_size);
 
   /* Check min size constraints; max size constraints are ignored as for
    * maximized windows.

src/core/keybindings.c

@@ -2222,7 +2222,7 @@ process_mouse_move_resize_grab (MetaDisplay     *display,
   if (event->keyval == CLUTTER_KEY_Escape)
     {
       /* Hide the tiling preview if necessary */
-      if (window->tile_mode != META_TILE_NONE)
+      if (screen->preview_tile_mode != META_TILE_NONE)
         meta_screen_hide_tile_preview (screen);
 
       /* Restore the original tile mode */

src/core/screen-private.h

@@ -56,6 +56,7 @@ struct _MetaScreen
   MetaUI *ui;
 
   guint tile_preview_timeout_id;
+  guint preview_tile_mode : 2;
 
   MetaWorkspace *active_workspace;
 

src/core/screen.c

@@ -1414,7 +1414,7 @@ meta_screen_update_tile_preview_timeout (gpointer data)
 
   if (window)
     {
-      switch (window->tile_mode)
+      switch (screen->preview_tile_mode)
         {
           case META_TILE_LEFT:
           case META_TILE_RIGHT:
@@ -1439,7 +1439,7 @@ meta_screen_update_tile_preview_timeout (gpointer data)
       int monitor;
 
       monitor = meta_window_get_current_tile_monitor_number (window);
-      meta_window_get_current_tile_area (window, &tile_rect);
+      meta_window_get_tile_area (window, screen->preview_tile_mode, &tile_rect);
       meta_compositor_show_tile_preview (screen->display->compositor,
                                          window, &tile_rect, monitor);
     }
@@ -1483,6 +1483,7 @@ meta_screen_hide_tile_preview (MetaScreen *screen)
     g_source_remove (screen->tile_preview_timeout_id);
   screen->tile_preview_timeout_id = 0;
 
+  screen->preview_tile_mode = META_TILE_NONE;
   meta_compositor_hide_tile_preview (screen->display->compositor);
 }
 

src/core/window-private.h

@@ -199,9 +199,7 @@ struct _MetaWindow
   guint maximize_vertically_after_placement : 1;
   guint minimize_after_placement : 1;
 
-  /* The current or requested tile mode. If maximized_vertically is true,
+  /* The current tile mode */
-   * this is the current mode. If not, it is the mode which will be
-   * requested after the window grab is released */
   guint tile_mode : 2;
   /* The last "full" maximized/unmaximized state. We need to keep track of
    * that to toggle between normal/tiled or maximized/tiled states. */
@@ -648,8 +646,9 @@ void meta_window_get_work_area_for_logical_monitor (MetaWindow         *window,
                                                     MetaRectangle      *area);
 
 int meta_window_get_current_tile_monitor_number (MetaWindow *window);
-void meta_window_get_current_tile_area         (MetaWindow    *window,
+void meta_window_get_tile_area                  (MetaWindow    *window,
-                                                MetaRectangle *tile_area);
+                                                 MetaTileMode   mode,
+                                                 MetaRectangle *tile_area);
 
 
 gboolean meta_window_same_application (MetaWindow *window,

src/core/window.c

@@ -3102,6 +3102,9 @@ meta_window_unmaximize (MetaWindow        *window,
       meta_window_get_frame_rect (window, &old_frame_rect);
       meta_window_get_buffer_rect (window, &old_buffer_rect);
 
+      if (unmaximize_vertically)
+        window->tile_mode = META_TILE_NONE;
+
       meta_topic (META_DEBUG_WINDOW_OPS,
                   "Unmaximizing %s%s\n",
                   window->desc,
@@ -5713,6 +5716,7 @@ update_move_maybe_tile (MetaWindow *window,
   MetaMonitorManager *monitor_manager =
     meta_backend_get_monitor_manager (backend);
   MetaLogicalMonitor *logical_monitor;
+  MetaScreen *screen = window->screen;
   MetaRectangle work_area;
 
   /* For side-by-side tiling we are interested in the inside vertical
@@ -5742,18 +5746,18 @@ update_move_maybe_tile (MetaWindow *window,
    */
   if (meta_window_can_tile_side_by_side (window) &&
       x >= logical_monitor->rect.x && x < (work_area.x + shake_threshold))
-    window->tile_mode = META_TILE_LEFT;
+    screen->preview_tile_mode = META_TILE_LEFT;
   else if (meta_window_can_tile_side_by_side (window) &&
            x >= work_area.x + work_area.width - shake_threshold &&
            x < (logical_monitor->rect.x + logical_monitor->rect.width))
-    window->tile_mode = META_TILE_RIGHT;
+    screen->preview_tile_mode = META_TILE_RIGHT;
   else if (meta_window_can_tile_maximized (window) &&
            y >= logical_monitor->rect.y && y <= work_area.y)
-    window->tile_mode = META_TILE_MAXIMIZED;
+    screen->preview_tile_mode = META_TILE_MAXIMIZED;
   else
-    window->tile_mode = META_TILE_NONE;
+    screen->preview_tile_mode = META_TILE_NONE;
 
-  if (window->tile_mode != META_TILE_NONE)
+  if (screen->preview_tile_mode != META_TILE_NONE)
     window->tile_monitor_number = logical_monitor->number;
 }
 
@@ -5768,6 +5772,7 @@ update_move (MetaWindow  *window,
   MetaRectangle old;
   int shake_threshold;
   MetaDisplay *display = window->display;
+  MetaScreen *screen = window->screen;
 
   display->grab_latest_motion_x = x;
   display->grab_latest_motion_y = y;
@@ -5805,7 +5810,7 @@ update_move (MetaWindow  *window,
     {
       /* We don't want to tile while snapping. Also, clear any previous tile
          request. */
-      window->tile_mode = META_TILE_NONE;
+      screen->preview_tile_mode = META_TILE_NONE;
       window->tile_monitor_number = -1;
     }
   else if (meta_prefs_get_edge_tiling () &&
@@ -5921,8 +5926,8 @@ update_move (MetaWindow  *window,
    * trigger it unwittingly, e.g. when shaking loose the window or moving
    * it to another monitor.
    */
-  meta_screen_update_tile_preview (window->screen,
+  meta_screen_update_tile_preview (screen,
-                                   window->tile_mode != META_TILE_NONE);
+                                   screen->preview_tile_mode != META_TILE_NONE);
 
   meta_window_get_frame_rect (window, &old);
 
@@ -6118,6 +6123,7 @@ end_grab_op (MetaWindow *window,
     {
       if (meta_grab_op_is_moving (window->display->grab_op))
         {
+          window->tile_mode = window->screen->preview_tile_mode;
           if (window->tile_mode != META_TILE_NONE)
             meta_window_tile (window);
           else
@@ -6133,6 +6139,7 @@ end_grab_op (MetaWindow *window,
                          TRUE);
         }
     }
+  window->screen->preview_tile_mode = META_TILE_NONE;
   meta_display_end_grab_op (window->display, clutter_event_get_time (event));
 }
 
@@ -6336,22 +6343,22 @@ meta_window_get_current_tile_monitor_number (MetaWindow *window)
 }
 
 void
-meta_window_get_current_tile_area (MetaWindow    *window,
+meta_window_get_tile_area (MetaWindow    *window,
-                                   MetaRectangle *tile_area)
+                           MetaTileMode   tile_mode,
+                           MetaRectangle *tile_area)
 {
   int tile_monitor_number;
 
-  g_return_if_fail (window->tile_mode != META_TILE_NONE);
+  g_return_if_fail (tile_mode != META_TILE_NONE);
 
   tile_monitor_number = meta_window_get_current_tile_monitor_number (window);
 
   meta_window_get_work_area_for_monitor (window, tile_monitor_number, tile_area);
 
-  if (window->tile_mode == META_TILE_LEFT  ||
+  if (tile_mode == META_TILE_LEFT  || tile_mode == META_TILE_RIGHT)
-      window->tile_mode == META_TILE_RIGHT)
     tile_area->width /= 2;
 
-  if (window->tile_mode == META_TILE_RIGHT)
+  if (tile_mode == META_TILE_RIGHT)
     tile_area->x += tile_area->width;
 }