ui/base/clipboard/scoped_clipboard_writer.h

// Copyright (c) 2012 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.

// This file declares the ScopedClipboardWriter class, a wrapper around
// the Clipboard class which simplifies writing data to the system clipboard.
// Upon deletion the class atomically writes all data to |clipboard_|,
// avoiding any potential race condition with other processes that are also
// writing to the system clipboard.

#ifndef UI_BASE_CLIPBOARD_SCOPED_CLIPBOARD_WRITER_H_
#define UI_BASE_CLIPBOARD_SCOPED_CLIPBOARD_WRITER_H_

#include <string>

#include "base/string16.h"
#include "ui/base/clipboard/clipboard.h"
#include "ui/base/ui_export.h"

class Pickle;

namespace ui {

// This class is a wrapper for |Clipboard| that handles packing data
// into a Clipboard::ObjectMap.
// NB: You should probably NOT be using this class if you include
// webkit_glue.h. Use ScopedClipboardWriterGlue instead.
class UI_EXPORT ScopedClipboardWriter {
 public:
  // Create an instance that is a simple wrapper around clipboard.
  ScopedClipboardWriter(Clipboard* clipboard, Clipboard::Buffer buffer);

  ~ScopedClipboardWriter();

  // Converts |text| to UTF-8 and adds it to the clipboard.
  void WriteText(const string16& text);

  // Converts the text of the URL to UTF-8 and adds it to the clipboard, then
  // notifies the Clipboard that we just wrote a URL.
  void WriteURL(const string16& text);

  // Adds HTML to the clipboard.  The url parameter is optional, but especially
  // useful if the HTML fragment contains relative links.
  void WriteHTML(const string16& markup, const std::string& source_url);

  // Adds RTF to the clipboard.
  void WriteRTF(const std::string& rtf_data);

  // Adds a bookmark to the clipboard.
  void WriteBookmark(const string16& bookmark_title,
                     const std::string& url);

  // Adds an html hyperlink (<a href>) to the clipboard. |anchor_text| should
  // be escaped prior to being passed in.
  void WriteHyperlink(const string16& anchor_text, const std::string& url);

  // Used by WebKit to determine whether WebKit wrote the clipboard last
  void WriteWebSmartPaste();

  // Adds a bitmap to the clipboard
  // Pixel format is assumed to be 32-bit BI_RGB.
  void WriteBitmapFromPixels(const void* pixels, const gfx::Size& size);

  // Adds arbitrary data to clipboard.
  void WritePickledData(const Pickle& pickle,
                        const Clipboard::FormatType& format);

  // Removes all objects that would be written to the clipboard.
  void Reset();

 protected:
  // Converts |text| to UTF-8 and adds it to the clipboard.  If it's a URL, we
  // also notify the clipboard of that fact.
  void WriteTextOrURL(const string16& text, bool is_url);

  // We accumulate the data passed to the various targets in the |objects_|
  // vector, and pass it to Clipboard::WriteObjects() during object destruction.
  Clipboard::ObjectMap objects_;
  Clipboard* clipboard_;
  Clipboard::Buffer buffer_;

  // We keep around the UTF-8 text of the URL in order to pass it to
  // Clipboard::DidWriteURL().
  std::string url_text_;

 private:
  DISALLOW_COPY_AND_ASSIGN(ScopedClipboardWriter);
};

}  // namespace ui

#endif  // UI_BASE_CLIPBOARD_SCOPED_CLIPBOARD_WRITER_H_