From 95f648147ddd0022aef57baa91733bd0527cd4f2 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Mon, 7 Dec 2015 15:08:27 -0500
Subject: [PATCH] dnd: Stop doing cancel animation in GTK+

Under Wayland, the compositor does it, so there is no need
for us to move the window ourselves. For X11, we are now
doing the animation from the X11 backend. Trigger that by
calling gdk_drag_drop_done().

What changes here is that we have to keep the icon_window
alive for as long as the drag context exists. Use a weak
reference to do so.
---
 gtk/gtkdnd.c | 116 ++++++++++++---------------------------------------
 1 file changed, 26 insertions(+), 90 deletions(-)

diff --git a/gtk/gtkdnd.c b/gtk/gtkdnd.c
index 439fc5c67a..8f78b2c7df 100644
--- a/gtk/gtkdnd.c
+++ b/gtk/gtkdnd.c
@@ -245,8 +245,6 @@ static void gtk_drag_selection_get             (GtkWidget         *widget,
                                                 guint              sel_info,
                                                 guint32            time,
                                                 gpointer           data);
-static void gtk_drag_anim_destroy              (GtkDragAnim       *anim);
-static gboolean gtk_drag_anim_timeout          (gpointer           data);
 static void gtk_drag_remove_icon               (GtkDragSourceInfo *info);
 static void gtk_drag_source_info_destroy       (GtkDragSourceInfo *info);
 static void gtk_drag_add_update_idle           (GtkDragSourceInfo *info);
@@ -3001,31 +2999,8 @@ gtk_drag_drop_finished (GtkDragSourceInfo *info,
         g_signal_emit_by_name (info->widget, "drag-failed",
                                info->context, result, &success);
 
-      if (success)
-        {
-          gtk_drag_source_info_destroy (info);
-        }
-      else
-        {
-          GtkDragAnim *anim;
-
-          /* Mark the context as dead, so if the destination decides
-           * to respond really late, we still are OK.
-           */
-          gtk_drag_clear_source_info (info->context);
-
-#ifdef GDK_WINDOWING_WAYLAND
-          if (GDK_IS_WAYLAND_DISPLAY (gtk_widget_get_display (info->widget)))
-            return; /* cancel animation is done by the compositor */ ;
-#endif
-          anim = g_slice_new0 (GtkDragAnim);
-          anim->info = info;
-          anim->start_time = gdk_frame_clock_get_frame_time (gtk_widget_get_frame_clock (info->widget));
-
-          info->cur_screen = gtk_widget_get_screen (info->widget);
-
-          gdk_threads_add_timeout_full (G_PRIORITY_DEFAULT, 17, gtk_drag_anim_timeout, anim, (GDestroyNotify) gtk_drag_anim_destroy);
-        }
+      gdk_drag_drop_done (info->context, success);
+      gtk_drag_source_info_destroy (info);
     }
 }
 
@@ -3157,74 +3132,37 @@ gtk_drag_selection_get (GtkWidget        *widget,
     }
 }
 
-/* From clutter-easing.c, based on Robert Penner's
- * infamous easing equations, MIT license.
- */
-static double
-ease_out_cubic (double t)
-{
-  double p = t - 1;
-  return p * p * p + 1;
-}
-
-static void
-gtk_drag_anim_destroy (GtkDragAnim *anim)
-{
-  gtk_drag_source_info_destroy (anim->info);
-  g_slice_free (GtkDragAnim, anim);
-}
-
-static gboolean
-gtk_drag_anim_timeout (gpointer data)
-{
-  GtkDragAnim *anim = data;
-  GtkDragSourceInfo *info = anim->info;
-  GdkFrameClock *frame_clock;
-  gint64 current_time;
-  double f;
-  double t;
-
-  frame_clock = gtk_widget_get_frame_clock (info->widget);
-
-  if (!frame_clock)
-    return G_SOURCE_REMOVE;
-
-  current_time = gdk_frame_clock_get_frame_time (frame_clock);
-
-  f = (current_time - anim->start_time) / (double) ANIM_TIME;
-
-  if (f >= 1.0)
-    return G_SOURCE_REMOVE;
-
-  t = ease_out_cubic (f);
-
-  gtk_window_move (GTK_WINDOW (info->icon_window),
-                   (info->cur_x + (info->start_x - info->cur_x) * t) - info->hot_x,
-                   (info->cur_y + (info->start_y - info->cur_y) * t) - info->hot_y);
-  gtk_widget_set_opacity (info->icon_window, (1.0 - f));
-
-  return G_SOURCE_CONTINUE;
-}
-
 static void
 gtk_drag_remove_icon (GtkDragSourceInfo *info)
 {
   if (info->icon_widget)
     {
-      gtk_widget_hide (info->icon_widget);
-      gtk_widget_set_opacity (info->icon_widget, 1.0);
-      if (info->destroy_icon)
-        gtk_widget_destroy (info->icon_widget);
-      g_object_unref (info->icon_widget);
+      GtkWidget *widget;
+
+      widget = info->icon_widget;
       info->icon_widget = NULL;
+
+      gtk_widget_hide (widget);
+      gtk_widget_set_opacity (widget, 1.0);
+
+      if (info->destroy_icon)
+        gtk_widget_destroy (widget);
+
+      g_object_unref (widget);
     }
 }
 
+static void
+gtk_drag_source_info_free (GtkDragSourceInfo *info)
+{
+  gtk_drag_remove_icon (info);
+  gtk_widget_destroy (info->icon_window);
+  g_free (info);
+}
+
 static void
 gtk_drag_source_info_destroy (GtkDragSourceInfo *info)
 {
-  gtk_drag_remove_icon (info);
-
   g_signal_handlers_disconnect_by_func (info->ipc_widget,
                                         gtk_drag_grab_broken_event_cb,
                                         info);
@@ -3249,9 +3187,6 @@ gtk_drag_source_info_destroy (GtkDragSourceInfo *info)
 
   g_clear_object (&info->widget);
 
-  if (info->icon_window)
-    gtk_widget_destroy (info->icon_window);
-
   gtk_selection_remove_all (info->ipc_widget);
   g_object_set_data (G_OBJECT (info->ipc_widget), I_("gtk-info"), NULL);
   source_widgets = g_slist_remove (source_widgets, info->ipc_widget);
@@ -3259,16 +3194,17 @@ gtk_drag_source_info_destroy (GtkDragSourceInfo *info)
 
   gtk_target_list_unref (info->target_list);
 
-  gtk_drag_clear_source_info (info->context);
-  g_object_unref (info->context);
-
   if (info->drop_timeout)
     g_source_remove (info->drop_timeout);
 
   if (info->update_idle)
     g_source_remove (info->update_idle);
 
-  g_free (info);
+  /* keep the icon_window alive until the (possible) drag cancel animation is done */
+  g_object_set_data_full (G_OBJECT (info->context), "former-gtk-source-info", info, (GDestroyNotify)gtk_drag_source_info_free);
+
+  gtk_drag_clear_source_info (info->context);
+  g_object_unref (info->context);
 }
 
 static gboolean