ui/message_center/views/padded_button.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_MESSAGE_CENTER_VIEWS_PADDED_BUTTON_H_
   6 #define UI_MESSAGE_CENTER_VIEWS_PADDED_BUTTON_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "ui/views/controls/button/image_button.h"
  11
  12 namespace message_center {
  13
  14 // PaddedButtons are ImageButtons whose image can be padded within the button.
  15 // This allows the creation of buttons like the notification close and expand
  16 // buttons whose clickable areas extends beyond their image areas
  17 // (<http://crbug.com/168822>) without the need to create and maintain
  18 // corresponding resource images with alpha padding. In the future, this class
  19 // will also allow for buttons whose touch areas extend beyond their clickable
  20 // area (<http://crbug.com/168856>).
  21 class PaddedButton : public views::ImageButton {
  22  public:
  23   PaddedButton(views::ButtonListener* listener);
  24   ~PaddedButton() override;
  25
  26   // Overridden from views::ImageButton:
  27   gfx::Size GetPreferredSize() const override;
  28   void OnPaint(gfx::Canvas* canvas) override;
  29   void OnFocus() override;
  30
  31   // The SetPadding() method also sets the button's image alignment (positive
  32   // values yield left/top alignments, negative values yield right/bottom ones,
  33   // and zero values center/middle ones). ImageButton::SetImageAlignment() calls
  34   // will not affect PaddedButton image alignments.
  35   void SetPadding(int horizontal_padding, int vertical_padding);
  36
  37   void SetNormalImage(int resource_id);
  38   void SetHoveredImage(int resource_id);
  39   void SetPressedImage(int resource_id);
  40
  41  protected:
  42   gfx::Point ComputePaddedImagePaintPosition(const gfx::ImageSkia& image);
  43
  44  private:
  45   gfx::Insets padding_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(PaddedButton);
  48 };
  49
  50 }  // namespace message_center
  51
  52 #endif  // UI_MESSAGE_CENTER_VIEWS_PADDED_BUTTON_H_