chrome/browser/tab_contents/web_drag_bookmark_handler_win.cc


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// 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.

#include "chrome/browser/tab_contents/web_drag_bookmark_handler_win.h"

#include "chrome/browser/bookmarks/bookmark_node_data.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/browser_window.h"
#include "chrome/browser/ui/bookmarks/bookmark_tab_helper.h"
#include "chrome/browser/ui/tab_contents/tab_contents.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/url_constants.h"
#include "content/public/browser/web_contents.h"
#include "ui/base/dragdrop/os_exchange_data.h"
#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
#include "webkit/glue/webdropdata.h"

using content::WebContents;

WebDragBookmarkHandlerWin::WebDragBookmarkHandlerWin()
    : tab_(NULL) {
}

WebDragBookmarkHandlerWin::~WebDragBookmarkHandlerWin() {
}

void WebDragBookmarkHandlerWin::DragInitialize(WebContents* contents) {
  // Ideally we would want to initialize the the TabContents member in
  // the constructor. We cannot do that as the WebDragTargetWin object is
  // created during the construction of the WebContents object.  The
  // TabContents is created much later.
  DCHECK(tab_ ? (tab_->web_contents() == contents) : true);
  if (!tab_)
    tab_ = TabContents::FromWebContents(contents);
}

void WebDragBookmarkHandlerWin::OnDragOver(IDataObject* data_object) {
  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
    ui::OSExchangeData os_exchange_data(
        new ui::OSExchangeDataProviderWin(data_object));
    BookmarkNodeData bookmark_drag_data;
    if (bookmark_drag_data.Read(os_exchange_data))
      tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragOver(
          bookmark_drag_data);
  }
}

void WebDragBookmarkHandlerWin::OnDragEnter(IDataObject* data_object) {
  // This is non-null if web_contents_ is showing an ExtensionWebUI with
  // support for (at the moment experimental) drag and drop extensions.
  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
    ui::OSExchangeData os_exchange_data(
        new ui::OSExchangeDataProviderWin(data_object));
    BookmarkNodeData bookmark_drag_data;
    if (bookmark_drag_data.Read(os_exchange_data))
      tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragEnter(
          bookmark_drag_data);
  }
}

void WebDragBookmarkHandlerWin::OnDrop(IDataObject* data_object) {
  // This is non-null if tab_contents_ is showing an ExtensionWebUI with
  // support for (at the moment experimental) drag and drop extensions.
  if (tab_) {
    if (tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
      ui::OSExchangeData os_exchange_data(
          new ui::OSExchangeDataProviderWin(data_object));
      BookmarkNodeData bookmark_drag_data;
      if (bookmark_drag_data.Read(os_exchange_data)) {
        tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDrop(
            bookmark_drag_data);
      }
    }

    // Focus the target browser.
    Browser* browser = browser::FindBrowserForController(
        &tab_->web_contents()->GetController(), NULL);
    if (browser)
      browser->window()->Show();
  }
}

void WebDragBookmarkHandlerWin::OnDragLeave(IDataObject* data_object) {
  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
    ui::OSExchangeData os_exchange_data(
        new ui::OSExchangeDataProviderWin(data_object));
    BookmarkNodeData bookmark_drag_data;
    if (bookmark_drag_data.Read(os_exchange_data))
      tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragLeave(
          bookmark_drag_data);
  }
}

bool WebDragBookmarkHandlerWin::AddDragData(const WebDropData& drop_data,
                                            ui::OSExchangeData* data) {
  if (!drop_data.url.SchemeIs(chrome::kJavaScriptScheme))
    return false;

  // We don't want to allow javascript URLs to be dragged to the desktop,
  // but we do want to allow them to be added to the bookmarks bar
  // (bookmarklets). So we create a fake bookmark entry (BookmarkNodeData
  // object) which explorer.exe cannot handle, and write the entry to data.
  BookmarkNodeData::Element bm_elt;
  bm_elt.is_url = true;
  bm_elt.url = drop_data.url;
  bm_elt.title = drop_data.url_title;

  BookmarkNodeData bm_drag_data;
  bm_drag_data.elements.push_back(bm_elt);

  // Pass in NULL as the profile so that the bookmark always adds the url
  // rather than trying to move an existing url.
  bm_drag_data.Write(NULL, data);

  return true;
}