ui/message_center/views/proportional_image_view.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_PROPORTIONAL_IMAGE_VIEW_H_
   6 #define UI_MESSAGE_CENTER_VIEWS_PROPORTIONAL_IMAGE_VIEW_H_
   7
   8 #include "ui/gfx/image/image_skia.h"
   9 #include "ui/message_center/message_center_export.h"
  10 #include "ui/views/view.h"
  11
  12 namespace message_center {
  13
  14 // ProportionalImageViews scale and center their images while preserving their
  15 // original proportions.
  16 class MESSAGE_CENTER_EXPORT ProportionalImageView : public views::View {
  17  public:
  18   // Internal class name.
  19   static const char kViewClassName[];
  20
  21   explicit ProportionalImageView(const gfx::Size& view_size);
  22   ~ProportionalImageView() override;
  23
  24   // |image| is scaled to fit within |view_size_| and |max_image_size| while
  25   // maintaining its original aspect ratio. It is then centered within the view.
  26   void SetImage(const gfx::ImageSkia& image,
  27                 const gfx::Size& max_image_size);
  28
  29   // Overridden from views::View:
  30   gfx::Size GetPreferredSize() const override;
  31   int GetHeightForWidth(int width) const override;
  32   void OnPaint(gfx::Canvas* canvas) override;
  33   const char* GetClassName() const override;
  34
  35  private:
  36   gfx::Size GetImageDrawingSize();
  37
  38   gfx::ImageSkia image_;
  39   gfx::Size max_image_size_;
  40   gfx::Size view_size_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(ProportionalImageView);
  43 };
  44
  45 }  // namespace message_center
  46
  47 #endif // UI_MESSAGE_CENTER_VIEWS_PROPORTIONAL_IMAGE_VIEW_H_