First shot at implementing drag&drop for Aura

ui/base/dragdrop/os_exchange_data_provider_aura.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 UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURA_H_
+#define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURA_H_
+#pragma once
+
+#include <map>
+
+#include "ui/base/dragdrop/os_exchange_data.h"
+#include "googleurl/src/gurl.h"
+#include "base/pickle.h"
+#include "base/file_path.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+
+namespace ui {
+
+// OSExchangeData::Provider implementation for aura on linux.
+class UI_EXPORT OSExchangeDataProviderAura : public OSExchangeData::Provider {
+ public:
+  OSExchangeDataProviderAura();
+
+  virtual ~OSExchangeDataProviderAura() {}
+
+  // Overridden from OSExchangeData::Provider:
+  virtual void SetString(const string16& data) OVERRIDE;
+  virtual void SetURL(const GURL& url, const string16& title) OVERRIDE;
+  virtual void SetFilename(const FilePath& path) OVERRIDE;
+  virtual void SetPickledData(OSExchangeData::CustomFormat format,
+                              const Pickle& data) OVERRIDE;
+  virtual bool GetString(string16* data) const OVERRIDE;
+  virtual bool GetURLAndTitle(GURL* url, string16* title) const OVERRIDE;
+  virtual bool GetFilename(FilePath* path) const OVERRIDE;
+  virtual bool GetPickledData(OSExchangeData::CustomFormat format,
+                              Pickle* data) const OVERRIDE;
+  virtual bool HasString() const OVERRIDE;
+  virtual bool HasURL() const OVERRIDE;
+  virtual bool HasFile() const OVERRIDE;
+  virtual bool HasCustomFormat(
+      OSExchangeData::CustomFormat format) const OVERRIDE;
+
+  void set_drag_image(const SkBitmap& drag_image) { drag_image_ = drag_image; }
+  const SkBitmap& drag_image() const { return drag_image_; }
+
+ private:
+  typedef std::map<OSExchangeData::CustomFormat, Pickle>  PickleData;
+
+  // Returns true if |formats_| contains a string format and the string can be
+  // parsed as a URL.
+  bool GetPlainTextURL(GURL* url) const;
+
+  // Actual formats that have been set. See comment above |known_formats_|
+  // for details.
+  int formats_;
+
+  // String contents.
+  string16 string_;
+
+  // URL contents.
+  GURL url_;
+  string16 title_;
+
+  // File name.
+  FilePath filename_;
+
+  // PICKLED_DATA contents.
+  PickleData pickle_data_;
+
+  // Drag image and offset data.
+  SkBitmap drag_image_;
+
+  DISALLOW_COPY_AND_ASSIGN(OSExchangeDataProviderAura);
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURA_H_