[gnome-builder/wip/chergert/headerbar] workbench: remove early perspectives

[Christian Hergert <chergert src gnome org>]

commit 1302c014ca25edec3743f2e48b5d2a09a0cdd2ed
Author: Christian Hergert <chergert redhat com>
Date:   Sun Jun 26 23:02:24 2016 -0700

    workbench: remove early perspectives
    
    After we transition to the editor, we can remove early perspectives which
    saves us a bunch of widgets and style calculation overhead.

 libide/workbench/ide-workbench-private.h |    1 +
 libide/workbench/ide-workbench.c         |   32 +++++++++++++++++++++++++++++-
 2 files changed, 32 insertions(+), 1 deletions(-)
---
diff --git a/libide/workbench/ide-workbench-private.h b/libide/workbench/ide-workbench-private.h
index e18d962..40f0dd7 100644
--- a/libide/workbench/ide-workbench-private.h
+++ b/libide/workbench/ide-workbench-private.h
@@ -33,6 +33,7 @@ struct _IdeWorkbench
   GtkApplicationWindow       parent;
 
   guint                      unloading : 1;
+  guint                      early_perspectives_removed : 1;
 
   IdeContext                *context;
   GCancellable              *cancellable;
diff --git a/libide/workbench/ide-workbench.c b/libide/workbench/ide-workbench.c
index 43bedc8..edaeddb 100644
--- a/libide/workbench/ide-workbench.c
+++ b/libide/workbench/ide-workbench.c
@@ -22,6 +22,7 @@
 
 #include "ide-debug.h"
 
+#include "editor/ide-editor-perspective.h"
 #include "genesis/ide-genesis-perspective.h"
 #include "greeter/ide-greeter-perspective.h"
 #include "ide-macros.h"
@@ -752,6 +753,30 @@ ide_workbench_notify_perspective_set (PeasExtensionSet *set,
   ide_workbench_addin_perspective_set (addin, perspective);
 }
 
+static void
+do_remove_early_perspectives (GtkWidget *widget,
+                              gpointer   user_data)
+{
+  if (IDE_IS_GREETER_PERSPECTIVE (widget) ||
+      IDE_IS_GENESIS_PERSPECTIVE (widget))
+    gtk_widget_destroy (widget);
+}
+
+static void
+remove_early_perspectives (IdeWorkbench *self)
+{
+  g_assert (IDE_IS_WORKBENCH (self));
+
+  if (self->early_perspectives_removed)
+    return;
+
+  gtk_container_foreach (GTK_CONTAINER (self->perspectives_stack),
+                         do_remove_early_perspectives,
+                         NULL);
+
+  self->early_perspectives_removed = TRUE;
+}
+
 void
 ide_workbench_set_visible_perspective (IdeWorkbench   *self,
                                        IdePerspective *perspective)
@@ -780,7 +805,12 @@ ide_workbench_set_visible_perspective (IdeWorkbench   *self,
   actions = ide_perspective_get_actions (perspective);
   gtk_widget_insert_action_group (GTK_WIDGET (self), "perspective", actions);
 
-  /* TODO: Possibly remove some perspectives */
+  /*
+   * If we are transitioning to the editor the first time, we can
+   * remove the early perspectives (greeter, genesis, etc).
+   */
+  if (IDE_IS_EDITOR_PERSPECTIVE (perspective))
+    remove_early_perspectives (self);
 
   gtk_widget_set_visible (GTK_WIDGET (self->perspective_menu_button),
                           !ide_perspective_is_early (perspective));