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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.
#ifndef CHROME_BROWSER_GTK_THROB_CONTROLLER_GTK_H_
#define CHROME_BROWSER_GTK_THROB_CONTROLLER_GTK_H_
#include "app/throb_animation.h"
#include "base/scoped_ptr.h"
typedef struct _GtkWidget GtkWidget;
// This class handles the "throbbing" of a GtkChromeButton. The visual effect
// of throbbing is created by painting partially transparent hover effects. It
// only works in non-gtk theme mode. This class mainly exists to glue an
// AnimationDelegate (C++ class) to a GtkChromeButton* (GTK/c object). Usage is
// as follows:
//
// GtkWidget* button = gtk_chrome_button_new();
// ThrobControllerGtk::ThrobFor(button);
//
// The ThrobFor() function will handle creation of the ThrobControllerGtk
// object, which will delete itself automatically when the throbbing is done,
// or when the widget is destroyed. It may also be canceled prematurely with
//
// ThrobControllerGtk* throbber =
// ThrobControllerGtk::GetThrobControllerGtk(button);
// throbber->Destroy();
class ThrobControllerGtk : public AnimationDelegate {
public:
virtual ~ThrobControllerGtk();
GtkWidget* button() { return button_; }
// Throb for |cycles| cycles. This will override the current remaining
// number of cycles. Note that a "cycle" is (somewhat unintuitively) half of
// a complete throb revolution.
void StartThrobbing(int cycles);
// Get the ThrobControllerGtk for a given GtkChromeButton*. It is an error
// to call this on a widget that is not a GtkChromeButton*.
static ThrobControllerGtk* GetThrobControllerGtk(GtkWidget* button);
// Make |button| throb for |cycles| cycles. It is an error to try to have
// two ThrobControllerGtk instances for one GtkChromeButton*.
static void ThrobFor(GtkWidget* button, int cycles);
// Stop throbbing and delete |this|.
void Destroy();
private:
explicit ThrobControllerGtk(GtkWidget* button);
// Overridden from AnimationDelegate.
virtual void AnimationProgressed(const Animation* animation);
virtual void AnimationEnded(const Animation* animation);
virtual void AnimationCanceled(const Animation* animation);
static void OnButtonDestroy(GtkWidget* widget,
ThrobControllerGtk* button);
ThrobAnimation animation_;
GtkWidget* button_;
DISALLOW_COPY_AND_ASSIGN(ThrobControllerGtk);
};
#endif // CHROME_BROWSER_GTK_THROB_CONTROLLER_GTK_H_
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