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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This class replicates some menubar behaviors that are tricky to get right.
// It is used to create a more native feel for the bookmark bar.
#ifndef CHROME_BROWSER_GTK_MENU_BAR_HELPER_H_
#define CHROME_BROWSER_GTK_MENU_BAR_HELPER_H_
#include <gtk/gtk.h>
#include <vector>
#include "app/gtk_signal.h"
#include "base/scoped_ptr.h"
class GtkSignalRegistrar;
class MenuBarHelper {
public:
class Delegate {
public:
virtual ~Delegate() {}
// Called when a the menu for a button ought to be triggered.
virtual void PopupForButton(GtkWidget* button) = 0;
virtual void PopupForButtonNextTo(GtkWidget* button,
GtkMenuDirectionType dir) = 0;
};
// |delegate| cannot be null.
explicit MenuBarHelper(Delegate* delegate);
~MenuBarHelper();
// Must be called whenever a button's menu starts showing. It triggers the
// MenuBarHelper to start listening for certain events.
void MenuStartedShowing(GtkWidget* button, GtkWidget* menu);
// Add |button| to the set of buttons we care about.
void Add(GtkWidget* button);
// Remove |button| from the set of buttons we care about.
void Remove(GtkWidget* button);
// Clear all buttons from the set.
void Clear();
private:
CHROMEGTK_CALLBACK_1(MenuBarHelper, gboolean, OnMenuMotionNotify,
GdkEventMotion*);
CHROMEGTK_CALLBACK_0(MenuBarHelper, void, OnMenuHidden);
CHROMEGTK_CALLBACK_1(MenuBarHelper, void, OnMenuMoveCurrent,
GtkMenuDirectionType);
// The buttons for which we pop up menus. We do not own these, or even add
// refs to them.
std::vector<GtkWidget*> buttons_;
// The button that is currently showing a menu, or NULL.
GtkWidget* button_showing_menu_;
// The highest level menu that is currently showing, or NULL.
GtkWidget* showing_menu_;
// All the submenus of |showing_menu_|. We connect to motion events on all
// of them.
std::vector<GtkWidget*> submenus_;
// Signal handlers that are attached only between the "show" and "hide" events
// for the menu.
scoped_ptr<GtkSignalRegistrar> signal_handlers_;
Delegate* delegate_;
};
#endif // CHROME_BROWSER_GTK_MENU_BAR_HELPER_H_
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