extensions/browser/extension_icon_placeholder.h

   1 // Copyright 2015 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 EXTENSIONS_BROWSER_EXTENSION_ICON_PLACEHOLDER_H_
   6 #define EXTENSIONS_BROWSER_EXTENSION_ICON_PLACEHOLDER_H_
   7
   8 #include <string>
   9
  10 #include "base/macros.h"
  11 #include "base/strings/string16.h"
  12 #include "extensions/common/constants.h"
  13 #include "ui/gfx/image/canvas_image_source.h"
  14 #include "ui/gfx/image/image.h"
  15
  16 namespace gfx {
  17 class Canvas;
  18 class Size;
  19 }
  20
  21 namespace extensions {
  22
  23 // An extension icon image with a gray background and the first letter of the
  24 // extension name, so that not all extensions without an icon look the same.
  25 class ExtensionIconPlaceholder : public gfx::CanvasImageSource {
  26  public:
  27   ExtensionIconPlaceholder(extension_misc::ExtensionIcons size,
  28                            const std::string& name);
  29   ~ExtensionIconPlaceholder() override;
  30
  31   // Creates an image backed by an ImageSkia with the ExtensionIconPlaceholder
  32   // as its image source.
  33   static gfx::Image CreateImage(extension_misc::ExtensionIcons size,
  34                                 const std::string& name);
  35
  36  private:
  37   // gfx::CanvasImageSource:
  38   void Draw(gfx::Canvas* canvas) override;
  39
  40   // The size this placeholder is filling.
  41   extension_misc::ExtensionIcons icon_size_;
  42
  43   // The first letter of the extension's name.
  44   base::string16 letter_;
  45
  46   // The gray background image, on top of which the letter is drawn.
  47   gfx::Image base_image_;
  48
  49   DISALLOW_COPY_AND_ASSIGN(ExtensionIconPlaceholder);
  50 };
  51
  52 }  // namespace extensions
  53
  54 #endif  // EXTENSIONS_BROWSER_EXTENSION_ICON_PLACEHOLDER_H_