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bookmark_drag_data.h

// Copyright (c) 2010 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_BOOKMARKS_BOOKMARK_DRAG_DATA_H_
#define CHROME_BROWSER_BOOKMARKS_BOOKMARK_DRAG_DATA_H_

#include <string>
#include <vector>

#include "base/file_path.h"
#include "base/string16.h"
#include "googleurl/src/gurl.h"

#if defined(TOOLKIT_VIEWS)
#include "app/os_exchange_data.h"
#endif

class BookmarkModel;
class BookmarkNode;
class OSExchangeData;
class Pickle;
class Profile;

// TODO(mrossetti): Rename BookmarkDragData to BookmarkNodeData, update comment.
// See: http://crbug.com/37891

// BookmarkDragData is used to represent the following:
//
// . A single URL.
// . A single node from the bookmark model.
// . A set of nodes from the bookmark model.
//
// BookmarkDragData is used by bookmark related views to represent a dragged
// bookmark or bookmarks.
//
// Typical usage when writing data for a drag is:
//   BookmarkDragData data(node_user_is_dragging);
//   data.Write(os_exchange_data_for_drag);
//
// Typical usage to read is:
//   BookmarkDragData data;
//   if (data.Read(os_exchange_data))
//     // data is valid, contents are in elements.

struct BookmarkDragData {
  // Element represents a single node.
  struct Element {
    explicit Element(const BookmarkNode* node);

    Element() : is_url(false), id_(0) {}

    // If true, this element represents a URL.
    bool is_url;

    // The URL, only valid if is_url is true.
    GURL url;

    // Title of the entry, used for both urls and groups/folders.
    string16 title;

    // Children, only used for non-URL nodes.
    std::vector<Element> children;

    int64 get_id() {
      return id_;
    }
   private:
    friend struct BookmarkDragData;

    // For reading/writing this Element.
    void WriteToPickle(Pickle* pickle) const;
    bool ReadFromPickle(Pickle* pickle, void** iterator);

    // ID of the node.
    int64 id_;
  };

  BookmarkDragData() { }

#if defined(TOOLKIT_VIEWS)
  static OSExchangeData::CustomFormat GetBookmarkCustomFormat();
#endif

  // Created a BookmarkDragData populated from the arguments.
  explicit BookmarkDragData(const BookmarkNode* node);
  explicit BookmarkDragData(const std::vector<const BookmarkNode*>& nodes);

  // Reads bookmarks from the given vector.
  bool ReadFromVector(const std::vector<const BookmarkNode*>& nodes);

  // Creates a single-bookmark DragData from url/title pair.
  bool ReadFromTuple(const GURL& url, const string16& title);

  // Writes elements to the clipboard.
  void WriteToClipboard(Profile* profile) const;

  // Reads bookmarks from the general copy/paste clipboard. Prefers data
  // written via WriteToClipboard but will also attempt to read a plain bookmark.
  bool ReadFromClipboard();
#if defined(OS_MACOSX)
  // Reads bookmarks that are being dragged from the drag and drop
  // pasteboard.
  bool ReadFromDragClipboard();
#endif

#if defined(TOOLKIT_VIEWS)
  // Writes elements to data. If there is only one element and it is a URL
  // the URL and title are written to the clipboard in a format other apps can
  // use.
  // |profile| is used to identify which profile the data came from. Use a
  // value of null to indicate the data is not associated with any profile.
  void Write(Profile* profile, OSExchangeData* data) const;

  // Restores this data from the clipboard, returning true on success.
  bool Read(const OSExchangeData& data);
#endif

  // Writes the data for a drag to |pickle|.
  void WriteToPickle(Profile* profile, Pickle* pickle) const;

  // Reads the data for a drag from a |pickle|.
  bool ReadFromPickle(Pickle* pickle);

  // Returns the nodes represented by this DragData. If this DragData was
  // created from the same profile then the nodes from the model are returned.
  // If the nodes can't be found (may have been deleted), an empty vector is
  // returned.
  std::vector<const BookmarkNode*> GetNodes(Profile* profile) const;

  // Convenience for getting the first node. Returns NULL if the data doesn't
  // match any nodes or there is more than one node.
  const BookmarkNode* GetFirstNode(Profile* profile) const;

  // Do we contain valid data?
  bool is_valid() const { return !elements.empty(); }

  // Returns true if there is a single url.
  bool has_single_url() const { return is_valid() && elements[0].is_url; }

  // Number of elements.
  size_t size() const { return elements.size(); }

  // Clears the data.
  void Clear();

  // Sets |profile_path_| to that of |profile|. This is useful for the
  // constructors/readers that don't set it. This should only be called if the
  // profile path is not already set.
  void SetOriginatingProfile(Profile* profile);

  // Returns true if this data is from the specified profile.
  bool IsFromProfile(Profile* profile) const;

  // The actual elements written to the clipboard.
  std::vector<Element> elements;

  // The MIME type for the clipboard format for BookmarkDragData.
  static const char* kClipboardFormatString;

  static bool ClipboardContainsBookmarks();

 private:
  // Path of the profile we originated from.
  FilePath::StringType profile_path_;
};

#endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_DRAG_DATA_H_

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