[gnome-builder/wip/chergert/perspective] workbench: re-implement ::unload signal for IdeWorkbench

[Christian Hergert <chergert src gnome org>]

commit 1cd411f54ad96b4f618ffcd7da2684d366cf8cfa
Author: Christian Hergert <chergert redhat com>
Date:   Sat Dec 5 01:37:55 2015 -0800

    workbench: re-implement ::unload signal for IdeWorkbench
    
    This was missing during the perspectives transition. Bring it back and
    hook things up on delete event.

 libide/ide-workbench-private.h |    3 ++
 libide/ide-workbench.c         |   72 ++++++++++++++++++++++++++++++++--------
 2 files changed, 61 insertions(+), 14 deletions(-)
---
diff --git a/libide/ide-workbench-private.h b/libide/ide-workbench-private.h
index eca6783..0d2239e 100644
--- a/libide/ide-workbench-private.h
+++ b/libide/ide-workbench-private.h
@@ -30,7 +30,10 @@ struct _IdeWorkbench
 {
   GtkApplicationWindow       parent;
 
+  guint                      unloading : 1;
+
   IdeContext                *context;
+  GCancellable              *cancellable;
   PeasExtensionSet          *addins;
 
   IdePerspective            *perspective;
diff --git a/libide/ide-workbench.c b/libide/ide-workbench.c
index 66b0140..f42e095 100644
--- a/libide/ide-workbench.c
+++ b/libide/ide-workbench.c
@@ -43,6 +43,7 @@ enum {
 enum {
   ACTION,
   SET_PERSPECTIVE,
+  UNLOAD,
   LAST_SIGNAL
 };
 
@@ -113,30 +114,64 @@ ide_workbench_resort_perspectives (IdeWorkbench *self)
 }
 
 static void
-ide_workbench_finalize (GObject *object)
+ide_workbench_unload_cb (GObject      *object,
+                         GAsyncResult *result,
+                         gpointer      user_data)
 {
-  IdeWorkbench *self = (IdeWorkbench *)object;
+  g_autoptr(IdeWorkbench) self = user_data;
+  IdeContext *context = (IdeContext *)object;
 
-  ide_clear_weak_pointer (&self->perspective);
-  g_clear_object (&self->context);
+  g_return_if_fail (IDE_IS_WORKBENCH (self));
 
-  G_OBJECT_CLASS (ide_workbench_parent_class)->finalize (object);
+  ide_context_unload_finish (context, result, NULL);
+
+  gtk_widget_destroy (GTK_WIDGET (self));
 }
 
-static void
-ide_workbench_constructed (GObject *object)
+static gboolean
+ide_workbench_delete_event (GtkWidget   *widget,
+                            GdkEventAny *event)
 {
-  G_OBJECT_CLASS (ide_workbench_parent_class)->constructed (object);
+  IdeWorkbench *self = (IdeWorkbench *)widget;
+
+  g_assert (IDE_IS_WORKBENCH (self));
+  g_assert (event != NULL);
+
+  if (self->unloading)
+    {
+      g_cancellable_cancel (self->cancellable);
+      return GDK_EVENT_STOP;
+    }
+
+  self->unloading = TRUE;
+
+  g_signal_emit (self, signals [UNLOAD], 0, self->context);
+
+  if (self->context != NULL)
+    {
+      self->cancellable = g_cancellable_new ();
+      ide_context_unload_async (self->context,
+                                self->cancellable,
+                                ide_workbench_unload_cb,
+                                g_object_ref (self));
+      return GDK_EVENT_STOP;
+    }
+
+  g_clear_object (&self->addins);
+
+  return GDK_EVENT_PROPAGATE;
 }
 
 static void
-ide_workbench_destroy (GtkWidget *widget)
+ide_workbench_finalize (GObject *object)
 {
-  IdeWorkbench *self = (IdeWorkbench *)widget;
+  IdeWorkbench *self = (IdeWorkbench *)object;
 
-  g_assert (IDE_IS_WORKBENCH (self));
+  ide_clear_weak_pointer (&self->perspective);
+  g_clear_object (&self->context);
+  g_clear_object (&self->cancellable);
 
-  GTK_WIDGET_CLASS (ide_workbench_parent_class)->destroy (widget);
+  G_OBJECT_CLASS (ide_workbench_parent_class)->finalize (object);
 }
 
 static void
@@ -195,12 +230,11 @@ ide_workbench_class_init (IdeWorkbenchClass *klass)
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 
-  object_class->constructed = ide_workbench_constructed;
   object_class->finalize = ide_workbench_finalize;
   object_class->get_property = ide_workbench_get_property;
   object_class->set_property = ide_workbench_set_property;
 
-  widget_class->destroy = ide_workbench_destroy;
+  widget_class->delete_event = ide_workbench_delete_event;
 
   properties [PROP_CONTEXT] =
     g_param_spec_object ("context",
@@ -252,6 +286,16 @@ ide_workbench_class_init (IdeWorkbenchClass *klass)
                                 NULL, NULL, NULL,
                                 G_TYPE_NONE, 1, G_TYPE_STRING);
 
+  signals [UNLOAD] =
+    g_signal_new ("unload",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  NULL,
+                  G_TYPE_NONE,
+                  1, IDE_TYPE_CONTEXT);
+
   gtk_widget_class_set_css_name (widget_class, "workbench");
   gtk_widget_class_set_template_from_resource (widget_class, "/org/gnome/builder/ui/ide-workbench.ui");
   gtk_widget_class_bind_template_child (widget_class, IdeWorkbench, perspectives_stack);