[totem] main: Add drag'n'drop support to the browser

[Bastien Nocera <hadess src gnome org>]

commit 19d4beedd2ba0e7e1fd52ca64622733767cca118
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Feb 17 13:44:51 2014 +0100

    main: Add drag'n'drop support to the browser
    
    https://bugzilla.gnome.org/show_bug.cgi?id=703549

 src/totem-grilo.c |   77 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 77 insertions(+), 0 deletions(-)
---
diff --git a/src/totem-grilo.c b/src/totem-grilo.c
index f12e9a7..e303c09 100644
--- a/src/totem-grilo.c
+++ b/src/totem-grilo.c
@@ -55,6 +55,12 @@
 #define PAGE_SIZE             50
 #define SCROLL_GET_MORE_LIMIT 0.8
 
+/* casts are to shut gcc up */
+static const GtkTargetEntry target_table[] = {
+       { (gchar*) "text/uri-list", 0, 0 },
+       { (gchar*) "_NETSCAPE_URL", 0, 1 }
+};
+
 struct _TotemGriloPrivate {
        Totem *totem;
        GtkWindow *main_window;
@@ -92,6 +98,7 @@ struct _TotemGriloPrivate {
 
        /* Browser widgets */
        GtkWidget *browser;
+       guint dnd_handler_id;
        GtkTreeModel *recent_model;
        GtkTreeModel *recent_sort_model;
        GtkTreeModel *browser_model;
@@ -1669,6 +1676,72 @@ select_none_action_cb (GSimpleAction    *action,
 }
 
 static void
+totem_grilo_drop_files (TotemGrilo       *self,
+                       GtkSelectionData *data)
+{
+       char **list;
+       guint i;
+
+       list = g_uri_list_extract_uris ((const char *) gtk_selection_data_get_data (data));
+
+       for (i = 0; list[i] != NULL; i++) {
+               if (list[i] == NULL)
+                       continue;
+
+               g_debug ("Preparing to add '%s' as dropped file", list[i]);
+               totem_grilo_add_item_to_recent (self, list[i], NULL, FALSE);
+       }
+
+       g_strfreev (list);
+}
+
+static void
+drop_video_cb (GtkWidget          *widget,
+              GdkDragContext     *context,
+              gint                x,
+              gint                y,
+              GtkSelectionData   *data,
+              guint               info,
+              guint               _time,
+              TotemGrilo         *self)
+{
+       GtkWidget *source_widget;
+       GdkDragAction action = gdk_drag_context_get_selected_action (context);
+
+       source_widget = gtk_drag_get_source_widget (context);
+
+       /* Drop of video on itself */
+       if (source_widget && widget == source_widget && action == GDK_ACTION_MOVE) {
+               gtk_drag_finish (context, FALSE, FALSE, _time);
+               return;
+       }
+
+       totem_grilo_drop_files (self, data);
+       gtk_drag_finish (context, TRUE, FALSE, _time);
+}
+
+static void
+totem_grilo_set_drop_enabled (TotemGrilo *self,
+                             gboolean    enabled)
+{
+       if (enabled == (self->priv->dnd_handler_id != 0))
+               return;
+
+       if (enabled) {
+               self->priv->dnd_handler_id = g_signal_connect (G_OBJECT (self->priv->browser), 
"drag_data_received",
+                                                              G_CALLBACK (drop_video_cb), self);
+               gtk_drag_dest_set (GTK_WIDGET (self->priv->browser), GTK_DEST_DEFAULT_ALL,
+                                  target_table, G_N_ELEMENTS (target_table),
+                                  GDK_ACTION_MOVE | GDK_ACTION_COPY);
+       } else {
+               g_signal_handler_disconnect (G_OBJECT (self->priv->browser),
+                                            self->priv->dnd_handler_id);
+               self->priv->dnd_handler_id = 0;
+               gtk_drag_dest_unset (GTK_WIDGET (self->priv->browser));
+       }
+}
+
+static void
 source_switched (GtkToggleButton  *button,
                 TotemGrilo       *self)
 {
@@ -1682,6 +1755,7 @@ source_switched (GtkToggleButton  *button,
                gd_main_view_set_model (GD_MAIN_VIEW (self->priv->browser),
                                        self->priv->recent_sort_model);
                self->priv->current_page = TOTEM_GRILO_PAGE_RECENT;
+               totem_grilo_set_drop_enabled (self, TRUE);
        } else if (g_str_equal (id, "channels")) {
                if (self->priv->browser_filter_model != NULL)
                        gd_main_view_set_model (GD_MAIN_VIEW (self->priv->browser),
@@ -1689,6 +1763,7 @@ source_switched (GtkToggleButton  *button,
                else
                        set_browser_filter_model_for_path (self, NULL);
                self->priv->current_page = TOTEM_GRILO_PAGE_CHANNELS;
+               totem_grilo_set_drop_enabled (self, FALSE);
        } else if (g_str_equal (id, "search")) {
                return;
        }
@@ -2070,6 +2145,8 @@ setup_browse (TotemGrilo *self)
        g_signal_connect (self->priv->browser, "selection-mode-request",
                          G_CALLBACK (selection_mode_requested), self);
 
+       totem_grilo_set_drop_enabled (self, TRUE);
+
        /* Selection toolbar */
        g_object_set (G_OBJECT (self->priv->header), "select-menu-model", self->priv->selectmenu, NULL);
        self->priv->selection_bar = totem_selection_toolbar_new ();