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[gedit/wip/panels-as-stacks: 14/19] Implement a new GeditMenuStackSwitcher widget.

commit f006f426d5bb419cba0668a6a0232b32c484a495
Author: Steve Frécinaux <code istique net>
Date:   Thu Jan 16 11:58:59 2014 +0100

    Implement a new GeditMenuStackSwitcher widget.
    
    This widget is similar to GtkStackSwitcher but uses a dropdown menu.

 gedit/Makefile.am                 |    2 +
 gedit/gedit-menu-stack-switcher.c |  289 +++++++++++++++++++++++++++++++++++++
 gedit/gedit-menu-stack-switcher.h |   73 ++++++++++
 gedit/gedit-window.c              |    7 +-
 4 files changed, 368 insertions(+), 3 deletions(-)
---
diff --git a/gedit/Makefile.am b/gedit/Makefile.am
index 075fcfd..28d1697 100644
--- a/gedit/Makefile.am
+++ b/gedit/Makefile.am
@@ -121,6 +121,7 @@ gedit_NOINST_H_FILES =                              \
        gedit/gedit-highlight-mode-dialog.h     \
        gedit/gedit-history-entry.h             \
        gedit/gedit-io-error-info-bar.h         \
+       gedit/gedit-menu-stack-switcher.h       \
        gedit/gedit-multi-notebook.h            \
        gedit/gedit-notebook.h                  \
        gedit/gedit-notebook-popup-menu.h       \
@@ -198,6 +199,7 @@ gedit_libgedit_c_files =                    \
        gedit/gedit-highlight-mode-dialog.c     \
        gedit/gedit-history-entry.c             \
        gedit/gedit-io-error-info-bar.c         \
+       gedit/gedit-menu-stack-switcher.c       \
        gedit/gedit-message-bus.c               \
        gedit/gedit-message.c                   \
        gedit/gedit-multi-notebook.c            \
diff --git a/gedit/gedit-menu-stack-switcher.c b/gedit/gedit-menu-stack-switcher.c
new file mode 100644
index 0000000..a820f9e
--- /dev/null
+++ b/gedit/gedit-menu-stack-switcher.c
@@ -0,0 +1,289 @@
+/*
+ * gedit-menu-stack-switcher.c
+ * This file is part of gedit
+ *
+ * Copyright (C) 2014 - Steve Frécinaux
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "gedit-menu-stack-switcher.h"
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <gtk/gtk.h>
+
+struct _GeditMenuStackSwitcherPrivate
+{
+  GtkWidget *label;
+
+  GtkStack *stack;
+  GSimpleActionGroup *action_group;
+
+  GMenu *menu;
+};
+
+enum {
+  PROP_0,
+  PROP_STACK
+};
+
+G_DEFINE_TYPE_WITH_PRIVATE (GeditMenuStackSwitcher, gedit_menu_stack_switcher, GTK_TYPE_MENU_BUTTON)
+
+static void
+gedit_menu_stack_switcher_get_property (GObject    *object,
+                                        guint       prop_id,
+                                        GValue     *value,
+                                        GParamSpec *pspec)
+{
+  GeditMenuStackSwitcher *switcher = GEDIT_MENU_STACK_SWITCHER (object);
+  GeditMenuStackSwitcherPrivate *priv = switcher->priv;
+
+  switch (prop_id)
+    {
+    case PROP_STACK:
+      g_value_set_object (value, priv->stack);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gedit_menu_stack_switcher_set_property (GObject      *object,
+                                        guint         prop_id,
+                                        const GValue *value,
+                                        GParamSpec   *pspec)
+{
+  GeditMenuStackSwitcher *switcher = GEDIT_MENU_STACK_SWITCHER (object);
+
+  switch (prop_id)
+    {
+    case PROP_STACK:
+      gedit_menu_stack_switcher_set_stack (switcher, g_value_get_object (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gedit_menu_stack_switcher_dispose (GObject *object)
+{
+  GeditMenuStackSwitcher *switcher = GEDIT_MENU_STACK_SWITCHER (object);
+
+  gedit_menu_stack_switcher_set_stack (switcher, NULL);
+
+  G_OBJECT_CLASS (gedit_menu_stack_switcher_parent_class)->dispose (object);
+}
+
+static void
+add_menu_entry (GtkWidget              *widget,
+                GeditMenuStackSwitcher *switcher)
+{
+  GeditMenuStackSwitcherPrivate *priv = switcher->priv;
+  gchar *title, *name;
+  GMenuItem *item;
+
+  gtk_container_child_get (GTK_CONTAINER (priv->stack), widget,
+                           "title", &title,
+                           "name", &name,
+                           NULL);
+
+  item = g_menu_item_new (title, NULL);
+  g_menu_item_set_action_and_target (item, "switcher.set-visible-child", "s", name);
+
+  g_free (title);
+  g_free (name);
+
+  g_menu_append_item (priv->menu, item);
+  g_object_unref (item);
+}
+
+static gboolean
+destroy_menu (GtkWidget *switcher)
+{
+  gtk_menu_button_set_menu_model (GTK_MENU_BUTTON (switcher), NULL);
+
+  /* GtkMenuButton makes the widget insensitive when we remove the model... */
+  gtk_widget_set_sensitive (switcher, TRUE);
+
+  return FALSE;
+}
+
+static void
+gedit_menu_stack_switcher_toggled (GtkToggleButton *button)
+{
+  GeditMenuStackSwitcher *switcher = GEDIT_MENU_STACK_SWITCHER (button);
+  GeditMenuStackSwitcherPrivate *priv = switcher->priv;
+
+  if (!priv->stack)
+    return;
+
+  if (gtk_toggle_button_get_active (button))
+    {
+      priv->menu = g_menu_new ();
+      gtk_container_foreach (GTK_CONTAINER (priv->stack), (GtkCallback) add_menu_entry, switcher);
+
+      gtk_menu_button_set_menu_model (GTK_MENU_BUTTON (switcher), G_MENU_MODEL (priv->menu));
+    }
+
+  GTK_TOGGLE_BUTTON_CLASS (gedit_menu_stack_switcher_parent_class)->toggled (button);
+
+  if (!gtk_toggle_button_get_active (button))
+    {
+      g_idle_add ((GSourceFunc) destroy_menu, switcher);
+      priv->menu = NULL;
+    }
+}
+
+static void
+gedit_menu_stack_switcher_class_init (GeditMenuStackSwitcherClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GtkToggleButtonClass *toggle_button_class = GTK_TOGGLE_BUTTON_CLASS (klass);
+
+  object_class->get_property = gedit_menu_stack_switcher_get_property;
+  object_class->set_property = gedit_menu_stack_switcher_set_property;
+  object_class->dispose = gedit_menu_stack_switcher_dispose;
+
+  toggle_button_class->toggled = gedit_menu_stack_switcher_toggled;
+
+  g_object_class_install_property (object_class,
+                                   PROP_STACK,
+                                   g_param_spec_object ("stack",
+                                                        "Stack",
+                                                        "Stack",
+                                                        GTK_TYPE_STACK,
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT));
+}
+
+static void
+gedit_menu_stack_switcher_init (GeditMenuStackSwitcher *switcher)
+{
+  GeditMenuStackSwitcherPrivate *priv;
+  GtkWidget *box;
+  GtkWidget *arrow;
+
+  priv = gedit_menu_stack_switcher_get_instance_private (switcher);
+  switcher->priv = priv;
+
+  box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+
+  arrow = gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_NONE);
+  g_object_bind_property (switcher, "direction", arrow, "arrow-type", 0);
+  gtk_box_pack_end (GTK_BOX (box), arrow, FALSE, TRUE, 6);
+
+  priv->label = gtk_label_new (NULL);
+  gtk_box_pack_start (GTK_BOX (box), priv->label, TRUE, TRUE, 6);
+
+  gtk_widget_show_all (box);
+  gtk_container_add (GTK_CONTAINER (switcher), box);
+}
+
+static void
+update_label (GeditMenuStackSwitcher *switcher)
+{
+  GeditMenuStackSwitcherPrivate *priv = switcher->priv;
+  GtkWidget *child;
+  gchar *title = NULL;
+
+  if (switcher->priv->stack)
+    {
+      child = gtk_stack_get_visible_child (GTK_STACK (priv->stack));
+      if (child)
+        gtk_container_child_get (GTK_CONTAINER (priv->stack), child,
+                                 "title", &title, NULL);
+    }
+
+  gtk_label_set_label (GTK_LABEL (priv->label), title);
+  g_free (title);
+}
+
+static void
+on_visible_child_changed (GtkWidget              *widget,
+                          GParamSpec             *pspec,
+                          GeditMenuStackSwitcher *switcher)
+{
+  update_label (switcher);
+}
+
+void
+gedit_menu_stack_switcher_set_stack (GeditMenuStackSwitcher *switcher,
+                                     GtkStack               *stack)
+{
+  GeditMenuStackSwitcherPrivate *priv;
+  GPropertyAction *action;
+
+  g_return_if_fail (GEDIT_IS_MENU_STACK_SWITCHER (switcher));
+  g_return_if_fail (stack == NULL || GTK_IS_STACK (stack));
+
+  priv = switcher->priv;
+
+  if (priv->stack == stack)
+    return;
+
+  if (priv->stack)
+    {
+      gtk_widget_insert_action_group (GTK_WIDGET (switcher), "switcher", NULL);
+      g_clear_object (&priv->action_group);
+      g_clear_object (&priv->stack);
+    }
+
+  if (stack)
+    {
+      priv->stack = g_object_ref (stack);
+      g_signal_connect (priv->stack, "notify::visible-child",
+                        G_CALLBACK (on_visible_child_changed), switcher);
+
+      priv->action_group = g_simple_action_group_new ();
+      gtk_widget_insert_action_group (GTK_WIDGET (switcher), "switcher", G_ACTION_GROUP 
(priv->action_group));
+
+      action = g_property_action_new ("set-visible-child", priv->stack, "visible-child-name");
+      g_action_map_add_action (G_ACTION_MAP (priv->action_group), G_ACTION (action));
+      g_object_unref (action);
+    }
+
+  update_label (switcher);
+  gtk_widget_set_sensitive (GTK_WIDGET (switcher), stack != NULL);
+
+  g_object_notify (G_OBJECT (switcher), "stack");
+}
+
+GtkStack *
+gedit_menu_stack_switcher_get_stack (GeditMenuStackSwitcher *switcher)
+{
+  g_return_val_if_fail (GEDIT_IS_MENU_STACK_SWITCHER (switcher), NULL);
+
+  return switcher->priv->stack;
+}
+
+GtkWidget *
+gedit_menu_stack_switcher_new (void)
+{
+  return g_object_new (GEDIT_TYPE_MENU_STACK_SWITCHER, NULL);
+}
+
+/* ex:set ts=2 sw=2 et: */
diff --git a/gedit/gedit-menu-stack-switcher.h b/gedit/gedit-menu-stack-switcher.h
new file mode 100644
index 0000000..25f233f
--- /dev/null
+++ b/gedit/gedit-menu-stack-switcher.h
@@ -0,0 +1,73 @@
+/*
+ * gedit-menu-stack-switcher.h
+ * This file is part of gedit
+ *
+ * Copyright (C) 2014 - Steve Frécinaux
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GEDIT_MENU_STACK_SWITCHER_H__
+#define __GEDIT_MENU_STACK_SWITCHER_H__
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define GEDIT_TYPE_MENU_STACK_SWITCHER             (gedit_menu_stack_switcher_get_type())
+#define GEDIT_MENU_STACK_SWITCHER(obj)             (G_TYPE_CHECK_INSTANCE_CAST((obj), 
GEDIT_TYPE_MENU_STACK_SWITCHER, GeditMenuStackSwitcher))
+#define GEDIT_MENU_STACK_SWITCHER_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST((klass), 
GEDIT_TYPE_MENU_STACK_SWITCHER, GeditMenuStackSwitcherClass))
+#define GEDIT_IS_MENU_STACK_SWITCHER(obj)          (G_TYPE_CHECK_INSTANCE_TYPE((obj), 
GEDIT_TYPE_MENU_STACK_SWITCHER))
+#define GEDIT_IS_MENU_STACK_SWITCHER_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass), 
GEDIT_TYPE_MENU_STACK_SWITCHER))
+#define GEDIT_MENU_STACK_SWITCHER_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS((obj), 
GEDIT_TYPE_MENU_STACK_SWITCHER, GeditMenuStackSwitcherClass))
+
+typedef struct _GeditMenuStackSwitcher        GeditMenuStackSwitcher;
+typedef struct _GeditMenuStackSwitcherClass   GeditMenuStackSwitcherClass;
+typedef struct _GeditMenuStackSwitcherPrivate GeditMenuStackSwitcherPrivate;
+
+struct _GeditMenuStackSwitcher
+{
+  GtkMenuButton parent;
+
+  /*< private >*/
+  GeditMenuStackSwitcherPrivate *priv;
+};
+
+struct _GeditMenuStackSwitcherClass
+{
+  GtkMenuButtonClass parent_class;
+
+  /* Padding for future expansion */
+  void (*_gedit_reserved1) (void);
+  void (*_gedit_reserved2) (void);
+  void (*_gedit_reserved3) (void);
+  void (*_gedit_reserved4) (void);
+};
+
+GType        gedit_menu_stack_switcher_get_type   (void) G_GNUC_CONST;
+
+GtkWidget *  gedit_menu_stack_switcher_new           (void);
+
+void         gedit_menu_stack_switcher_set_stack  (GeditMenuStackSwitcher *switcher,
+                                                   GtkStack               *stack);
+
+GtkStack *   gedit_menu_stack_switcher_get_stack  (GeditMenuStackSwitcher *switcher);
+
+G_END_DECLS
+
+#endif  /* __GEDIT_MENU_STACK_SWITCHER_H__  */
+
+/* ex:set ts=2 sw=2 et: */
diff --git a/gedit/gedit-window.c b/gedit/gedit-window.c
index 34f25cd..09492d4 100644
--- a/gedit/gedit-window.c
+++ b/gedit/gedit-window.c
@@ -63,6 +63,7 @@
 #include "gedit-marshal.h"
 #include "gedit-document.h"
 #include "gedit-small-button.h"
+#include "gedit-menu-stack-switcher.h"
 
 #define TAB_WIDTH_DATA "GeditWindowTabWidthData"
 #define FULLSCREEN_ANIMATION_SPEED 4
@@ -2993,9 +2994,9 @@ gedit_window_init (GeditWindow *window)
                                G_BINDING_DEFAULT | G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
 
 
-       window->priv->side_stack_switcher = gtk_stack_switcher_new ();
-       gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (window->priv->side_stack_switcher),
-                                     GTK_STACK (_gedit_panel_get_stack (GEDIT_PANEL 
(window->priv->side_panel))));
+       window->priv->side_stack_switcher = gedit_menu_stack_switcher_new ();
+       gedit_menu_stack_switcher_set_stack (GEDIT_MENU_STACK_SWITCHER (window->priv->side_stack_switcher),
+                                            GTK_STACK (_gedit_panel_get_stack (GEDIT_PANEL 
(window->priv->side_panel))));
 
        gtk_header_bar_set_custom_title (GTK_HEADER_BAR (window->priv->side_headerbar),
                                         window->priv->side_stack_switcher);
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