Bug 627715 — 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

1 files changed, 84 insertions, 2 deletions

diff --git a/libempathy-gtk/empathy-individual-linker.c b/libempathy-gtk/empathy-individual-linker.c
index 272979046..b4226a71c 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));