Implement input type=color UI (common part)

chrome/browser/ui/color_chooser.h

+// Copyright (c) 2011 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_COLOR_CHOOSER_H_
+#define CHROME_BROWSER_UI_COLOR_CHOOSER_H_
+#pragma once
+
+#if defined(ENABLE_INPUT_COLOR)
+
+#include "base/memory/singleton.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebColor.h"
+#include "ui/gfx/native_widget_types.h"
+
+// Abstraction object for color choosers of each platforms.
+class ColorChooser {
+ public:
+  // An interface implemented by a Listener object wishing to know about the
+  // the results from the color chooser.
+  class Listener {
+   public:
+    virtual void DidChooseColor(WebKit::WebColor color) = 0;
+    virtual void DidCleanup() = 0;
+  };
+
+  // Returns singleton instance of ColorChooserImpl.
+  static ColorChooser* GetInstance();
+
+  void open(Listener* listener, WebKit::WebColor initial_color);
+  void cleanup(Listener* listener);
+  void setSelectedColor(WebKit::WebColor color);
+
+ protected:
+  virtual ~ColorChooser();
+  virtual void openImpl(Listener* listener, WebKit::WebColor initial_color) = 0;
+  virtual void cleanupImpl(Listener* listener) = 0;
+  virtual void setSelectedColorImpl(WebKit::WebColor color) = 0;
+};
+
+#endif // defined(ENABLE_INPUT_COLOR)
+
+#endif  // CHROME_BROWSER_UI_COLOR_CHOOSER_H_