Support custom drag-and-drop of bookmarks in Aura

chrome/browser/tab_contents/web_drag_bookmark_handler_aura.cc

+// 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_aura.h"
+
+#include "chrome/browser/bookmarks/bookmark_node_data.h"
+#include "chrome/browser/ui/browser.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_wrapper.h"
+#include "content/public/browser/web_contents.h"
+#include "ui/base/dragdrop/os_exchange_data.h"
+#include "ui/base/dragdrop/os_exchange_data_provider_aura.h"
+#include "webkit/glue/webdropdata.h"
+
+using content::WebContents;
+
+WebDragBookmarkHandlerAura::WebDragBookmarkHandlerAura()
+    : tab_(NULL) {
+}
+
+WebDragBookmarkHandlerAura::~WebDragBookmarkHandlerAura() {
+}
+
+void WebDragBookmarkHandlerAura::DragInitialize(WebContents* contents) {
+  // Ideally we would want to initialize the the TabContentsWrapper member in
+  // the constructor. We cannot do that as the WebDragDest object is
+  // created during the construction of the TabContents object.  The
+  // TabContentsWrapper is created much later.
+  DCHECK(tab_ ? (tab_->web_contents() == contents) : true);
+  if (!tab_)
+    tab_ = TabContentsWrapper::GetCurrentWrapperForContents(contents);
+}
+
+void WebDragBookmarkHandlerAura::OnDragOver() {
+  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
+    if (bookmark_drag_data_.is_valid())
+      tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragOver(
+          bookmark_drag_data_);
+  }
+}
+
+void WebDragBookmarkHandlerAura::OnReceiveDragData(
+    const ui::OSExchangeData& data) {
+  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
+    // Read the bookmark drag data and save it for use in later events in this
+    // drag.
+    bookmark_drag_data_.Read(data);
+  }
+}
+
+void WebDragBookmarkHandlerAura::OnDragEnter() {
+  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
+    if (bookmark_drag_data_.is_valid())
+      tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragEnter(
+          bookmark_drag_data_);
+  }
+}
+
+void WebDragBookmarkHandlerAura::OnDrop() {
+  if (tab_) {
+    if (tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
+      if (bookmark_drag_data_.is_valid()) {
+        tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDrop(
+            bookmark_drag_data_);
+      }
+    }
+
+    // Focus the target browser.
+    Browser* browser = Browser::GetBrowserForController(
+        &tab_->web_contents()->GetController(), NULL);
+    if (browser)
+      browser->window()->Show();
+  }
+
+  bookmark_drag_data_.Clear();
+}
+
+void WebDragBookmarkHandlerAura::OnDragLeave() {
+  if (tab_ && tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
+    if (bookmark_drag_data_.is_valid())
+      tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragLeave(
+          bookmark_drag_data_);
+  }
+
+  bookmark_drag_data_.Clear();
+}