chrome/browser/ui/views/tab_icon_view.h

// Copyright (c) 2006-2008 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_UI_VIEWS_TAB_ICON_VIEW_H_
#define CHROME_BROWSER_UI_VIEWS_TAB_ICON_VIEW_H_
#pragma once

#include "views/view.h"

class SkBitmap;
class TabContents;

////////////////////////////////////////////////////////////////////////////////
//
// A view to display a tab favicon or a throbber.
//
////////////////////////////////////////////////////////////////////////////////
class TabIconView : public views::View {
 public:
  // Classes implement this interface to provide state for the TabIconView.
  class TabIconViewModel {
   public:
    // Returns true if the TabIconView should show a loading animation.
    virtual bool ShouldTabIconViewAnimate() const = 0;

    // Returns the favicon to display in the icon view
    virtual SkBitmap GetFaviconForTabIconView() = 0;
  };

  static void InitializeIfNeeded();

  explicit TabIconView(TabIconViewModel* provider);
  virtual ~TabIconView();

  // Invoke whenever the tab state changes or the throbber should update.
  void Update();

  // Set the throbber to the light style (for use on dark backgrounds).
  void set_is_light(bool is_light) { is_light_ = is_light; }

  // Overridden from View
  virtual void OnPaint(gfx::Canvas* canvas);
  virtual gfx::Size GetPreferredSize();

 private:
  void PaintThrobber(gfx::Canvas* canvas);
  void PaintFavicon(gfx::Canvas* canvas, const SkBitmap& bitmap);
  void PaintIcon(gfx::Canvas* canvas,
                 const SkBitmap& bitmap,
                 int src_x,
                 int src_y,
                 int src_w,
                 int src_h,
                 bool filter);

  // Our model.
  TabIconViewModel* model_;

  // Whether the throbber is running.
  bool throbber_running_;

  // Whether we should display our light or dark style.
  bool is_light_;

  // Current frame of the throbber being painted. This is only used if
  // throbber_running_ is true.
  int throbber_frame_;

  DISALLOW_COPY_AND_ASSIGN(TabIconView);
};

#endif  // CHROME_BROWSER_UI_VIEWS_TAB_ICON_VIEW_H_