[gtk/dnd-gestures-2: 40/63] stackswitcher: Port to GtkDropTarget

[Matthias Clasen <matthiasc src gnome org>]

commit b85b2bdea97d68df4c6f030f0ae02a8f91e35a4c
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 2 00:21:01 2020 -0500

    stackswitcher: Port to GtkDropTarget

 gtk/gtkstackswitcher.c | 37 +++++++++++++++++++++++--------------
 1 file changed, 23 insertions(+), 14 deletions(-)
---
diff --git a/gtk/gtkstackswitcher.c b/gtk/gtkstackswitcher.c
index 07de3af617..0b5c5ff656 100644
--- a/gtk/gtkstackswitcher.c
+++ b/gtk/gtkstackswitcher.c
@@ -93,6 +93,14 @@ enum {
   PROP_STACK
 };
 
+static void     gtk_stack_switcher_drag_leave  (GtkDropTarget    *dest,
+                                                GtkStackSwitcher *self);
+static gboolean gtk_stack_switcher_drag_motion (GtkDropTarget    *dest,
+                                                int               x,
+                                                int               y,
+                                                GtkStackSwitcher *self);
+
+
 G_DEFINE_TYPE_WITH_PRIVATE (GtkStackSwitcher, gtk_stack_switcher, GTK_TYPE_WIDGET)
 
 static void
@@ -100,14 +108,21 @@ gtk_stack_switcher_init (GtkStackSwitcher *switcher)
 {
   GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (switcher);
   GtkStyleContext *context;
+  GdkContentFormats *formats;
+  GtkDropTarget *dest;
 
   priv->buttons = g_hash_table_new_full (g_direct_hash, g_direct_equal, g_object_unref, NULL);
 
   context = gtk_widget_get_style_context (GTK_WIDGET (switcher));
   gtk_style_context_add_class (context, GTK_STYLE_CLASS_LINKED);
 
-  gtk_drag_dest_set (GTK_WIDGET (switcher), 0, NULL, 0);
-  gtk_drag_dest_set_track_motion (GTK_WIDGET (switcher), TRUE);
+  formats = gdk_content_formats_new (NULL, 0);
+  dest = gtk_drop_target_new (0, formats, 0);
+  gdk_content_formats_unref (formats);
+  gtk_drop_target_set_track_motion (dest, TRUE);
+  g_signal_connect (dest, "drag-leave", G_CALLBACK (gtk_stack_switcher_drag_leave), switcher);
+  g_signal_connect (dest, "drag-motion", G_CALLBACK (gtk_stack_switcher_drag_motion), switcher);
+  gtk_drop_target_attach (dest, GTK_WIDGET (switcher));
 }
 
 static void
@@ -249,12 +264,11 @@ gtk_stack_switcher_switch_timeout (gpointer data)
 }
 
 static gboolean
-gtk_stack_switcher_drag_motion (GtkWidget *widget,
-                                GdkDrop   *drop,
-                                gint       x,
-                                gint       y)
+gtk_stack_switcher_drag_motion (GtkDropTarget    *dest,
+                                int               x,
+                                int               y,
+                                GtkStackSwitcher *self)
 {
-  GtkStackSwitcher *self = GTK_STACK_SWITCHER (widget);
   GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (self);
   GtkWidget *button;
   GHashTableIter iter;
@@ -292,11 +306,9 @@ gtk_stack_switcher_drag_motion (GtkWidget *widget,
 }
 
 static void
-gtk_stack_switcher_drag_leave (GtkWidget *widget,
-                               GdkDrop   *drop)
+gtk_stack_switcher_drag_leave (GtkDropTarget    *dest,
+                               GtkStackSwitcher *self)
 {
-  GtkStackSwitcher *self = GTK_STACK_SWITCHER (widget);
-
   remove_switch_timer (self);
 }
 
@@ -562,9 +574,6 @@ gtk_stack_switcher_class_init (GtkStackSwitcherClass *class)
   object_class->dispose = gtk_stack_switcher_dispose;
   object_class->finalize = gtk_stack_switcher_finalize;
 
-  widget_class->drag_motion = gtk_stack_switcher_drag_motion;
-  widget_class->drag_leave = gtk_stack_switcher_drag_leave;
-
   g_object_class_install_property (object_class,
                                    PROP_STACK,
                                    g_param_spec_object ("stack",