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[mutter] Make tile preview a compositor plugin effect

commit 8c69f1b33cb4871d74843bac01d83602fa116afe
Author: Stefano Facchini <stefano facchini gmail com>
Date:   Sat Mar 24 11:29:39 2012 +0100

    Make tile preview a compositor plugin effect
    
    https://bugzilla.gnome.org/show_bug.cgi?id=665758

 src/Makefile.am                      |    2 -
 src/compositor/compositor.c          |   28 +++++
 src/compositor/meta-plugin-manager.c |   41 +++++++
 src/compositor/meta-plugin-manager.h |    5 +
 src/compositor/plugins/default.c     |   95 ++++++++++++++++
 src/core/keybindings.c               |    2 +-
 src/core/screen-private.h            |    5 +-
 src/core/screen.c                    |   39 +++-----
 src/core/window-private.h            |    1 +
 src/core/window.c                    |   28 +++--
 src/meta/compositor.h                |    8 ++
 src/meta/meta-plugin.h               |    5 +
 src/ui/tile-preview.c                |  196 ----------------------------------
 src/ui/tile-preview.h                |   36 ------
 src/ui/ui.h                          |    1 -
 15 files changed, 216 insertions(+), 276 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 34bfedc..bbd28b6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -165,8 +165,6 @@ libmutter_la_SOURCES =                              \
        ui/resizepopup.h                        \
        ui/tabpopup.c                           \
        ui/tabpopup.h                           \
-       ui/tile-preview.c                       \
-       ui/tile-preview.h                       \
        ui/theme-parser.c                       \
        ui/theme.c                              \
        meta/theme.h                            \
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index 730c961..51e27f3 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -1587,3 +1587,31 @@ meta_compositor_monotonic_time_to_server_time (MetaDisplay *display,
   else
     return monotonic_time + compositor->server_time_offset;
 }
+
+void
+meta_compositor_show_tile_preview (MetaCompositor *compositor,
+                                   MetaScreen     *screen,
+                                   MetaWindow     *window,
+                                   MetaRectangle  *tile_rect,
+                                   int             tile_monitor_number)
+{
+  MetaCompScreen *info = meta_screen_get_compositor_data (screen);
+
+  if (!info->plugin_mgr)
+    return;
+
+  meta_plugin_manager_show_tile_preview (info->plugin_mgr,
+                                         window, tile_rect, tile_monitor_number);
+}
+
+void
+meta_compositor_hide_tile_preview (MetaCompositor *compositor,
+                                   MetaScreen     *screen)
+{
+  MetaCompScreen *info = meta_screen_get_compositor_data (screen);
+
+  if (!info->plugin_mgr)
+    return;
+
+  meta_plugin_manager_hide_tile_preview (info->plugin_mgr);
+}
diff --git a/src/compositor/meta-plugin-manager.c b/src/compositor/meta-plugin-manager.c
index 1d6d373..41589a3 100644
--- a/src/compositor/meta-plugin-manager.c
+++ b/src/compositor/meta-plugin-manager.c
@@ -324,3 +324,44 @@ meta_plugin_manager_confirm_display_change (MetaPluginManager *plugin_mgr)
   else
     return meta_plugin_complete_display_change (plugin, TRUE);
 }
+
+gboolean
+meta_plugin_manager_show_tile_preview (MetaPluginManager *plugin_mgr,
+                                       MetaWindow        *window,
+                                       MetaRectangle     *tile_rect,
+                                       int                tile_monitor_number)
+{
+  MetaPlugin *plugin = plugin_mgr->plugin;
+  MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
+  MetaDisplay *display  = meta_screen_get_display (plugin_mgr->screen);
+
+  if (display->display_opening)
+    return FALSE;
+
+  if (klass->show_tile_preview)
+    {
+      klass->show_tile_preview (plugin, window, tile_rect, tile_monitor_number);
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+gboolean
+meta_plugin_manager_hide_tile_preview (MetaPluginManager *plugin_mgr)
+{
+  MetaPlugin *plugin = plugin_mgr->plugin;
+  MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
+  MetaDisplay *display  = meta_screen_get_display (plugin_mgr->screen);
+
+  if (display->display_opening)
+    return FALSE;
+
+  if (klass->hide_tile_preview)
+    {
+      klass->hide_tile_preview (plugin);
+      return TRUE;
+    }
+
+  return FALSE;
+}
diff --git a/src/compositor/meta-plugin-manager.h b/src/compositor/meta-plugin-manager.h
index b24059f..efc4deb 100644
--- a/src/compositor/meta-plugin-manager.h
+++ b/src/compositor/meta-plugin-manager.h
@@ -75,4 +75,9 @@ gboolean _meta_plugin_xevent_filter (MetaPlugin *plugin,
 
 void     meta_plugin_manager_confirm_display_change (MetaPluginManager *mgr);
 
+gboolean meta_plugin_manager_show_tile_preview (MetaPluginManager *mgr,
+                                                MetaWindow        *window,
+                                                MetaRectangle     *tile_rect,
+                                                int                tile_monitor_number);
+gboolean meta_plugin_manager_hide_tile_preview (MetaPluginManager *mgr);
 #endif
diff --git a/src/compositor/plugins/default.c b/src/compositor/plugins/default.c
index edfb24b..0568953 100644
--- a/src/compositor/plugins/default.c
+++ b/src/compositor/plugins/default.c
@@ -39,6 +39,7 @@
 #define SWITCH_TIMEOUT    500
 
 #define ACTOR_DATA_KEY "MCCP-Default-actor-data"
+#define SCREEN_TILE_PREVIEW_DATA_KEY "MCCP-Default-screen-tile-preview-data"
 
 #define META_TYPE_DEFAULT_PLUGIN            (meta_default_plugin_get_type ())
 #define META_DEFAULT_PLUGIN(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_DEFAULT_PLUGIN, 
MetaDefaultPlugin))
@@ -67,6 +68,7 @@ struct _MetaDefaultPluginClass
 };
 
 static GQuark actor_data_quark = 0;
+static GQuark screen_tile_preview_data_quark = 0;
 
 static void start      (MetaPlugin      *plugin);
 static void minimize   (MetaPlugin      *plugin,
@@ -97,6 +99,12 @@ static void kill_window_effects   (MetaPlugin      *plugin,
                                    MetaWindowActor *actor);
 static void kill_switch_workspace (MetaPlugin      *plugin);
 
+static void show_tile_preview (MetaPlugin      *plugin,
+                               MetaWindow      *window,
+                               MetaRectangle   *tile_rect,
+                               int              tile_monitor_number);
+static void hide_tile_preview (MetaPlugin      *plugin);
+
 static void confirm_display_change (MetaPlugin *plugin);
 
 static const MetaPluginInfo * plugin_info (MetaPlugin *plugin);
@@ -143,6 +151,15 @@ typedef struct
 } EffectCompleteData;
 
 
+typedef struct _ScreenTilePreview
+{
+  ClutterActor   *actor;
+
+  GdkRGBA        *preview_color;
+
+  MetaRectangle   tile_rect;
+} ScreenTilePreview;
+
 static void
 meta_default_plugin_dispose (GObject *object)
 {
@@ -203,6 +220,8 @@ meta_default_plugin_class_init (MetaDefaultPluginClass *klass)
   plugin_class->unmaximize       = unmaximize;
   plugin_class->destroy          = destroy;
   plugin_class->switch_workspace = switch_workspace;
+  plugin_class->show_tile_preview = show_tile_preview;
+  plugin_class->hide_tile_preview = hide_tile_preview;
   plugin_class->plugin_info      = plugin_info;
   plugin_class->kill_window_effects   = kill_window_effects;
   plugin_class->kill_switch_workspace = kill_switch_workspace;
@@ -770,6 +789,82 @@ destroy (MetaPlugin *plugin, MetaWindowActor *window_actor)
     meta_plugin_destroy_completed (plugin, window_actor);
 }
 
+/*
+ * Tile preview private data accessor
+ */
+static void
+free_screen_tile_preview (gpointer data)
+{
+  ScreenTilePreview *preview = data;
+
+  if (G_LIKELY (preview != NULL)) {
+    clutter_actor_destroy (preview->actor);
+    g_slice_free (ScreenTilePreview, preview);
+  }
+}
+
+static ScreenTilePreview *
+get_screen_tile_preview (MetaScreen *screen)
+{
+  ScreenTilePreview *preview = g_object_get_qdata (G_OBJECT (screen), screen_tile_preview_data_quark);
+
+  if (G_UNLIKELY (screen_tile_preview_data_quark == 0))
+    screen_tile_preview_data_quark = g_quark_from_static_string (SCREEN_TILE_PREVIEW_DATA_KEY);
+
+  if (G_UNLIKELY (!preview))
+    {
+      preview = g_slice_new0 (ScreenTilePreview);
+
+      preview->actor = clutter_actor_new ();
+      clutter_actor_set_background_color (preview->actor, CLUTTER_COLOR_Blue);
+      clutter_actor_set_opacity (preview->actor, 100);
+
+      clutter_actor_add_child (meta_get_window_group_for_screen (screen), preview->actor);
+      g_object_set_qdata_full (G_OBJECT (screen),
+                               screen_tile_preview_data_quark, preview,
+                               free_screen_tile_preview);
+    }
+
+  return preview;
+}
+
+static void
+show_tile_preview (MetaPlugin    *plugin,
+                   MetaWindow    *window,
+                   MetaRectangle *tile_rect,
+                   int            tile_monitor_number)
+{
+  MetaScreen *screen = meta_plugin_get_screen (plugin);
+  ScreenTilePreview *preview = get_screen_tile_preview (screen);
+  ClutterActor *window_actor;
+
+  if (CLUTTER_ACTOR_IS_VISIBLE (preview->actor)
+      && preview->tile_rect.x == tile_rect->x
+      && preview->tile_rect.y == tile_rect->y
+      && preview->tile_rect.width == tile_rect->width
+      && preview->tile_rect.height == tile_rect->height)
+    return; /* nothing to do */
+
+  clutter_actor_set_position (preview->actor, tile_rect->x, tile_rect->y);
+  clutter_actor_set_size (preview->actor, tile_rect->width, tile_rect->height);
+
+  clutter_actor_show (preview->actor);
+
+  window_actor = CLUTTER_ACTOR (meta_window_get_compositor_private (window));
+  clutter_actor_lower (preview->actor, window_actor);
+
+  preview->tile_rect = *tile_rect;
+}
+
+static void
+hide_tile_preview (MetaPlugin *plugin)
+{
+  MetaScreen *screen = meta_plugin_get_screen (plugin);
+  ScreenTilePreview *preview = get_screen_tile_preview (screen);
+
+  clutter_actor_hide (preview->actor);
+}
+
 static void
 kill_switch_workspace (MetaPlugin     *plugin)
 {
diff --git a/src/core/keybindings.c b/src/core/keybindings.c
index 2519d26..f7329bd 100644
--- a/src/core/keybindings.c
+++ b/src/core/keybindings.c
@@ -2207,7 +2207,7 @@ process_mouse_move_resize_grab (MetaDisplay   *display,
     {
       /* Hide the tiling preview if necessary */
       if (window->tile_mode != META_TILE_NONE)
-        meta_screen_tile_preview_hide (screen);
+        meta_screen_hide_tile_preview (screen);
 
       /* Restore the original tile mode */
       window->tile_mode = display->grab_tile_mode;
diff --git a/src/core/screen-private.h b/src/core/screen-private.h
index f0cf235..2d2a5dc 100644
--- a/src/core/screen-private.h
+++ b/src/core/screen-private.h
@@ -65,7 +65,6 @@ struct _MetaScreen
   MetaRectangle rect;  /* Size of screen; rect.x & rect.y are always 0 */
   MetaUI *ui;
   MetaTabPopup *tab_popup, *ws_popup;
-  MetaTilePreview *tile_preview;
 
   guint tile_preview_timeout_id;
 
@@ -167,9 +166,9 @@ void          meta_screen_workspace_popup_select       (MetaScreen    *screen,
 MetaWorkspace*meta_screen_workspace_popup_get_selected (MetaScreen    *screen);
 void          meta_screen_workspace_popup_destroy      (MetaScreen    *screen);
 
-void          meta_screen_tile_preview_update          (MetaScreen    *screen,
+void          meta_screen_update_tile_preview          (MetaScreen    *screen,
                                                         gboolean       delay);
-void          meta_screen_tile_preview_hide            (MetaScreen    *screen);
+void          meta_screen_hide_tile_preview            (MetaScreen    *screen);
 
 MetaWindow*   meta_screen_get_mouse_window     (MetaScreen                 *screen,
                                                 MetaWindow                 *not_this_one);
diff --git a/src/core/screen.c b/src/core/screen.c
index 58346f3..af76c25 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -762,7 +762,6 @@ meta_screen_new (MetaDisplay *display,
 
   screen->tab_popup = NULL;
   screen->ws_popup = NULL;
-  screen->tile_preview = NULL;
 
   screen->tile_preview_timeout_id = 0;
 
@@ -868,9 +867,6 @@ meta_screen_free (MetaScreen *screen,
   if (screen->tile_preview_timeout_id)
     g_source_remove (screen->tile_preview_timeout_id);
 
-  if (screen->tile_preview)
-    meta_tile_preview_free (screen->tile_preview);
-  
   g_free (screen->screen_name);
 
   g_object_unref (screen);
@@ -1677,7 +1673,7 @@ meta_screen_workspace_popup_destroy (MetaScreen *screen)
 }
 
 static gboolean
-meta_screen_tile_preview_update_timeout (gpointer data)
+meta_screen_update_tile_preview_timeout (gpointer data)
 {
   MetaScreen *screen = data;
   MetaWindow *window = screen->display->grab_window;
@@ -1685,19 +1681,6 @@ meta_screen_tile_preview_update_timeout (gpointer data)
 
   screen->tile_preview_timeout_id = 0;
 
-  if (!screen->tile_preview)
-    {
-      Window xwindow;
-      gulong create_serial;
-
-      screen->tile_preview = meta_tile_preview_new (screen->number);
-      xwindow = meta_tile_preview_get_xwindow (screen->tile_preview,
-                                               &create_serial);
-      meta_stack_tracker_record_add (screen->stack_tracker,
-                                     xwindow,
-                                     create_serial);
-    }
-
   if (window)
     {
       switch (window->tile_mode)
@@ -1722,12 +1705,16 @@ meta_screen_tile_preview_update_timeout (gpointer data)
   if (needs_preview)
     {
       MetaRectangle tile_rect;
+      int monitor;
 
+      monitor = meta_window_get_current_tile_monitor_number (window);
       meta_window_get_current_tile_area (window, &tile_rect);
-      meta_tile_preview_show (screen->tile_preview, &tile_rect);
+      meta_compositor_show_tile_preview (screen->display->compositor,
+                                         screen, window, &tile_rect, monitor);
     }
   else
-    meta_tile_preview_hide (screen->tile_preview);
+    meta_compositor_hide_tile_preview (screen->display->compositor,
+                                       screen);
 
   return FALSE;
 }
@@ -1735,7 +1722,7 @@ meta_screen_tile_preview_update_timeout (gpointer data)
 #define TILE_PREVIEW_TIMEOUT_MS 200
 
 void
-meta_screen_tile_preview_update (MetaScreen *screen,
+meta_screen_update_tile_preview (MetaScreen *screen,
                                  gboolean    delay)
 {
   if (delay)
@@ -1745,7 +1732,7 @@ meta_screen_tile_preview_update (MetaScreen *screen,
 
       screen->tile_preview_timeout_id =
         g_timeout_add (TILE_PREVIEW_TIMEOUT_MS,
-                       meta_screen_tile_preview_update_timeout,
+                       meta_screen_update_tile_preview_timeout,
                        screen);
     }
   else
@@ -1753,18 +1740,18 @@ meta_screen_tile_preview_update (MetaScreen *screen,
       if (screen->tile_preview_timeout_id > 0)
         g_source_remove (screen->tile_preview_timeout_id);
 
-      meta_screen_tile_preview_update_timeout ((gpointer)screen);
+      meta_screen_update_tile_preview_timeout ((gpointer)screen);
     }
 }
 
 void
-meta_screen_tile_preview_hide (MetaScreen *screen)
+meta_screen_hide_tile_preview (MetaScreen *screen)
 {
   if (screen->tile_preview_timeout_id > 0)
     g_source_remove (screen->tile_preview_timeout_id);
 
-  if (screen->tile_preview)
-    meta_tile_preview_hide (screen->tile_preview);
+  meta_compositor_hide_tile_preview (screen->display->compositor,
+                                     screen);
 }
 
 MetaWindow*
diff --git a/src/core/window-private.h b/src/core/window-private.h
index 135c7db..74e568f 100644
--- a/src/core/window-private.h
+++ b/src/core/window-private.h
@@ -623,6 +623,7 @@ void meta_window_handle_mouse_grab_op_event (MetaWindow *window,
 
 GList* meta_window_get_workspaces (MetaWindow *window);
 
+int meta_window_get_current_tile_monitor_number (MetaWindow *window);
 void meta_window_get_current_tile_area         (MetaWindow    *window,
                                                 MetaRectangle *tile_area);
 
diff --git a/src/core/window.c b/src/core/window.c
index e4eb96d..6405b23 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -1431,9 +1431,6 @@ meta_window_new (MetaDisplay   *display,
   if (!window->override_redirect)
     meta_stack_add (window->screen->stack,
                     window);
-  else if (window->screen->tile_preview != NULL &&
-           meta_tile_preview_get_xwindow (window->screen->tile_preview, NULL) == xwindow)
-    window->layer = META_LAYER_NORMAL;
   else
     window->layer = META_LAYER_OVERRIDE_REDIRECT; /* otherwise set by MetaStack */
 
@@ -3684,7 +3681,7 @@ meta_window_tile (MetaWindow *window)
     directions = META_MAXIMIZE_VERTICAL;
 
   meta_window_maximize_internal (window, directions, NULL);
-  meta_screen_tile_preview_update (window->screen, FALSE);
+  meta_screen_update_tile_preview (window->screen, FALSE);
 
   if (window->display->compositor)
     {
@@ -9278,7 +9275,7 @@ update_move (MetaWindow  *window,
    * trigger it unwittingly, e.g. when shaking loose the window or moving
    * it to another monitor.
    */
-  meta_screen_tile_preview_update (window->screen,
+  meta_screen_update_tile_preview (window->screen,
                                    window->tile_mode != META_TILE_NONE);
 
   meta_window_get_client_root_coords (window, &old);
@@ -10034,6 +10031,20 @@ meta_window_get_work_area_all_monitors (MetaWindow    *window,
               window->desc, area->x, area->y, area->width, area->height);
 }
 
+int
+meta_window_get_current_tile_monitor_number (MetaWindow *window)
+{
+  int tile_monitor_number = window->tile_monitor_number;
+
+  if (tile_monitor_number < 0)
+    {
+      meta_warning ("%s called with an invalid monitor number; using 0 instead\n", G_STRFUNC);
+      tile_monitor_number = 0;
+    }
+
+  return tile_monitor_number;
+}
+
 void
 meta_window_get_current_tile_area (MetaWindow    *window,
                                    MetaRectangle *tile_area)
@@ -10042,12 +10053,7 @@ meta_window_get_current_tile_area (MetaWindow    *window,
 
   g_return_if_fail (window->tile_mode != META_TILE_NONE);
 
-  tile_monitor_number = window->tile_monitor_number;
-  if (tile_monitor_number < 0)
-    {
-      meta_warning ("%s called with an invalid monitor number; using 0 instead\n", G_STRFUNC);
-      tile_monitor_number = 0;
-    }
+  tile_monitor_number = meta_window_get_current_tile_monitor_number (window);
 
   meta_window_get_work_area_for_monitor (window, tile_monitor_number, tile_area);
 
diff --git a/src/meta/compositor.h b/src/meta/compositor.h
index 45c8b09..d1be47e 100644
--- a/src/meta/compositor.h
+++ b/src/meta/compositor.h
@@ -121,4 +121,12 @@ void meta_compositor_sync_screen_size          (MetaCompositor *compositor,
 void meta_compositor_flash_screen              (MetaCompositor *compositor,
                                                 MetaScreen     *screen);
 
+void meta_compositor_show_tile_preview (MetaCompositor *compositor,
+                                        MetaScreen     *screen,
+                                        MetaWindow     *window,
+                                        MetaRectangle  *tile_rect,
+                                        int             tile_monitor_number);
+void meta_compositor_hide_tile_preview (MetaCompositor *compositor,
+                                        MetaScreen     *screen);
+
 #endif /* META_COMPOSITOR_H */
diff --git a/src/meta/meta-plugin.h b/src/meta/meta-plugin.h
index 00fe779..cef7853 100644
--- a/src/meta/meta-plugin.h
+++ b/src/meta/meta-plugin.h
@@ -158,6 +158,11 @@ struct _MetaPluginClass
                             gint                to,
                             MetaMotionDirection direction);
 
+  void (*show_tile_preview) (MetaPlugin      *plugin,
+                             MetaWindow      *window,
+                             MetaRectangle   *tile_rect,
+                             int              tile_monitor_number);
+  void (*hide_tile_preview) (MetaPlugin      *plugin);
 
   /**
    * MetaPluginClass::kill_window_effects:
diff --git a/src/ui/ui.h b/src/ui/ui.h
index 07bf77e..f117079 100644
--- a/src/ui/ui.h
+++ b/src/ui/ui.h
@@ -179,6 +179,5 @@ int      meta_ui_get_drag_threshold       (MetaUI *ui);
 MetaUIDirection meta_ui_get_direction (void);
 
 #include "tabpopup.h"
-#include "tile-preview.h"
 
 #endif
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