Implement stop/go button for Linux

chrome/browser/gtk/go_button_gtk.h

+// Copyright (c) 2009 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.
+
+#ifndef CHROME_BROWSER_GTK_GO_BUTTON_GTK_H_
+#define CHROME_BROWSER_GTK_GO_BUTTON_GTK_H_
+
+#include <gtk/gtk.h>
+
+#include "base/basictypes.h"
+#include "base/task.h"
+#include "chrome/browser/gtk/custom_button.h"
+#include "chrome/common/owned_widget_gtk.h"
+
+class Browser;
+class Task;
+
+class GoButtonGtk {
+ public:
+  enum Mode { MODE_GO = 0, MODE_STOP };
+  enum ButtonState { BS_NORMAL = 0, BS_HOT };
+
+  explicit GoButtonGtk(Browser* browser);
+  ~GoButtonGtk();
+
+  GtkWidget* widget() const { return widget_.get(); }
+  ButtonState state() const { return state_; }
+
+  // Force the button state.  Useful for when the foreground tab changes.
+  void ChangeMode(Mode mode);
+
+  // Ask for a specified button state.  This is called when the loading state of
+  // the tab changes.  This method may postpone the actual ChangeMode() call
+  // until another event (such as waiting for a potential double click to end,
+  // or for the mouse to stop hovering over the button).
+  void ScheduleChangeMode(Mode mode);
+
+ private:
+  friend class GoButtonGtkPeer;
+
+  // gtk signals
+  static gboolean OnExpose(GtkWidget* widget,
+                           GdkEventExpose* e,
+                           GoButtonGtk* button);
+  static gboolean OnEnter(GtkButton* widget, GoButtonGtk* button);
+  static gboolean OnLeave(GtkButton* widget, GoButtonGtk* button);
+  static gboolean OnClicked(GtkButton* widget, GoButtonGtk* button);
+
+  Task* CreateButtonTimerTask();
+  void OnButtonTimer();
+
+  // Keep a pointer to the Browser object to execute commands on it.
+  Browser* const browser_;
+
+  // Delay time to wait before allowing a mode change.  This is to prevent a
+  // mode switch while the user is double clicking.
+  int button_delay_;
+  ScopedRunnableMethodFactory<GoButtonGtk> stop_timer_;
+
+  // The mode we should be in
+  Mode intended_mode_;
+
+  // The currently-visible mode - this may different from the intended mode
+  Mode visible_mode_;
+
+  ButtonState state_;
+
+  CustomDrawButtonBase go_;
+  CustomDrawButtonBase stop_;
+
+  OwnedWidgetGtk widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(GoButtonGtk);
+};
+
+#endif  // CHROME_BROWSER_GTK_GO_BUTTON_GTK_H_