// Copyright 2013 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 UI_MESSAGE_CENTER_VIEWS_PADDED_BUTTON_H_
#define UI_MESSAGE_CENTER_VIEWS_PADDED_BUTTON_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "ui/views/controls/button/image_button.h"
namespace message_center {
// PaddedButtons are ImageButtons whose image can be padded within the button.
// This allows the creation of buttons like the notification close and expand
// buttons whose clickable areas extends beyond their image areas
// (<http://crbug.com/168822>) without the need to create and maintain
// corresponding resource images with alpha padding. In the future, this class
// will also allow for buttons whose touch areas extend beyond their clickable
// area (<http://crbug.com/168856>).
class PaddedButton : public views::ImageButton {
public:
PaddedButton(views::ButtonListener* listener);
virtual ~PaddedButton();
// Overridden from views::ImageButton:
virtual gfx::Size GetPreferredSize() OVERRIDE;
virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
virtual void OnFocus() OVERRIDE;
// The SetPadding() method also sets the button's image alignment (positive
// values yield left/top alignments, negative values yield right/bottom ones,
// and zero values center/middle ones). ImageButton::SetImageAlignment() calls
// will not affect PaddedButton image alignments.
void SetPadding(int horizontal_padding, int vertical_padding);
void SetNormalImage(int resource_id);
void SetHoveredImage(int resource_id);
void SetPressedImage(int resource_id);
protected:
gfx::Point ComputePaddedImagePaintPosition(const gfx::ImageSkia& image);
private:
gfx::Insets padding_;
DISALLOW_COPY_AND_ASSIGN(PaddedButton);
};
} // namespace message_center