[empathy] Bug 627715 — Linking dialog: move personas using DnD

[Philip Withnall <pwithnall src gnome org>]

commit 270a982f2cf19635a61f41e6cc49f7d6e8cfd016
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Tue Aug 24 17:54:34 2010 +0100

    Bug 627715 â?? Linking dialog: move personas using DnD
    
    Add support for dragging Individuals from the EmpathyIndividualView to the
    EmpathyPersonaView in the linking dialogue, and for dragging Personas in the
    reverse direction, linking and unlinking the appropriate Individuals,
    respectively. Closes: bgo#627715

 libempathy-gtk/empathy-individual-linker.c |   86 +++++++++++++++++++++++++++-
 1 files changed, 84 insertions(+), 2 deletions(-)
---
diff --git a/libempathy-gtk/empathy-individual-linker.c b/libempathy-gtk/empathy-individual-linker.c
index 2729790..b4226a7 100644
--- a/libempathy-gtk/empathy-individual-linker.c
+++ b/libempathy-gtk/empathy-individual-linker.c
@@ -216,6 +216,78 @@ row_toggled_cb (GtkCellRendererToggle *cell_renderer,
   gtk_tree_path_free (tree_path);
 }
 
+static gboolean
+individual_view_drag_motion_cb (GtkWidget *widget,
+    GdkDragContext *context,
+    gint x,
+    gint y,
+    guint time_)
+{
+  EmpathyIndividualView *view = EMPATHY_INDIVIDUAL_VIEW (widget);
+  GdkAtom target;
+
+  target = gtk_drag_dest_find_target (GTK_WIDGET (view), context, NULL);
+
+  if (target == gdk_atom_intern_static_string ("text/persona-id"))
+    {
+      GtkTreePath *path;
+
+      /* FIXME: It doesn't make sense for us to highlight a specific row or
+       * position to drop a Persona in, so just highlight the entire widget.
+       * Since I can't find a way to do this, just highlight the first possible
+       * position in the tree. */
+      gdk_drag_status (context, gdk_drag_context_get_suggested_action (context),
+          time_);
+
+      path = gtk_tree_path_new_first ();
+      gtk_tree_view_set_drag_dest_row (GTK_TREE_VIEW (view), path,
+          GTK_TREE_VIEW_DROP_BEFORE);
+      gtk_tree_path_free (path);
+
+      return TRUE;
+    }
+
+  /* Unknown or unhandled drag target */
+  gdk_drag_status (context, GDK_ACTION_DEFAULT, time_);
+  gtk_tree_view_set_drag_dest_row (GTK_TREE_VIEW (view), NULL, 0);
+
+  return FALSE;
+}
+
+static gboolean
+individual_view_drag_persona_received_cb (EmpathyIndividualView *view,
+    GdkDragAction action,
+    FolksPersona *persona,
+    FolksIndividual *individual,
+    EmpathyIndividualLinker *self)
+{
+  EmpathyIndividualLinkerPriv *priv = GET_PRIV (self);
+
+  /* A Persona has been dragged onto the EmpathyIndividualView (from the
+   * EmpathyPersonaView), so we try to remove the Individual which contains
+   * the Persona from the link. */
+  if (individual != priv->start_individual)
+    {
+      unlink_individual (self, individual);
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
+static gboolean
+persona_view_drag_individual_received_cb (EmpathyPersonaView *view,
+    GdkDragAction action,
+    FolksIndividual *individual,
+    EmpathyIndividualLinker *self)
+{
+  /* An Individual has been dragged onto the EmpathyPersonaView (from the
+   * EmpathyIndividualView), so we try to add the Individual to the link. */
+  link_individual (self, individual);
+
+  return TRUE;
+}
+
 static void
 set_up (EmpathyIndividualLinker *self)
 {
@@ -258,11 +330,18 @@ set_up (EmpathyIndividualLinker *self)
   empathy_individual_store_set_show_protocols (priv->individual_store, FALSE);
 
   priv->individual_view = empathy_individual_view_new (priv->individual_store,
-      EMPATHY_INDIVIDUAL_VIEW_FEATURE_NONE, EMPATHY_INDIVIDUAL_FEATURE_NONE);
+      EMPATHY_INDIVIDUAL_VIEW_FEATURE_INDIVIDUAL_DRAG |
+      EMPATHY_INDIVIDUAL_VIEW_FEATURE_INDIVIDUAL_DROP |
+      EMPATHY_INDIVIDUAL_VIEW_FEATURE_PERSONA_DROP,
+      EMPATHY_INDIVIDUAL_FEATURE_NONE);
   empathy_individual_view_set_show_offline (priv->individual_view, TRUE);
 
   g_signal_connect (priv->individual_view, "row-activated",
       (GCallback) row_activated_cb, self);
+  g_signal_connect (priv->individual_view, "drag-motion",
+      (GCallback) individual_view_drag_motion_cb, self);
+  g_signal_connect (priv->individual_view, "drag-persona-received",
+      (GCallback) individual_view_drag_persona_received_cb, self);
 
   /* Add a checkbox column to the selector */
   cell_renderer = gtk_cell_renderer_toggle_new ();
@@ -323,9 +402,12 @@ set_up (EmpathyIndividualLinker *self)
   priv->persona_store = empathy_persona_store_new (priv->new_individual);
   empathy_persona_store_set_show_protocols (priv->persona_store, TRUE);
   persona_view = empathy_persona_view_new (priv->persona_store,
-      EMPATHY_PERSONA_VIEW_FEATURE_NONE);
+      EMPATHY_PERSONA_VIEW_FEATURE_ALL);
   empathy_persona_view_set_show_offline (persona_view, TRUE);
 
+  g_signal_connect (persona_view, "drag-individual-received",
+      (GCallback) persona_view_drag_individual_received_cb, self);
+
   gtk_container_add (GTK_CONTAINER (scrolled_window),
       GTK_WIDGET (persona_view));
   gtk_widget_show (GTK_WIDGET (persona_view));