1// Copyright (c) 2011 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_ 6#define CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_ 7#pragma once 8 9#include "base/memory/scoped_ptr.h" 10#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h" 11#include "ui/base/dragdrop/drop_target.h" 12 13class InterstitialDropTarget; 14class RenderViewHost; 15class TabContents; 16 17// A helper object that provides drop capabilities to a TabContents. The 18// DropTarget handles drags that enter the region of the TabContents by 19// passing on the events to the renderer. 20class WebDropTarget : public ui::DropTarget { 21 public: 22 // Create a new WebDropTarget associating it with the given HWND and 23 // TabContents. 24 WebDropTarget(HWND source_hwnd, TabContents* contents); 25 virtual ~WebDropTarget(); 26 27 void set_drag_cursor(WebKit::WebDragOperation op) { 28 drag_cursor_ = op; 29 } 30 31 protected: 32 virtual DWORD OnDragEnter(IDataObject* data_object, 33 DWORD key_state, 34 POINT cursor_position, 35 DWORD effect); 36 37 virtual DWORD OnDragOver(IDataObject* data_object, 38 DWORD key_state, 39 POINT cursor_position, 40 DWORD effect); 41 42 virtual void OnDragLeave(IDataObject* data_object); 43 44 virtual DWORD OnDrop(IDataObject* data_object, 45 DWORD key_state, 46 POINT cursor_position, 47 DWORD effect); 48 49 private: 50 // Our associated TabContents. 51 TabContents* tab_contents_; 52 53 // We keep track of the render view host we're dragging over. If it changes 54 // during a drag, we need to re-send the DragEnter message. WARNING: 55 // this pointer should never be dereferenced. We only use it for comparing 56 // pointers. 57 RenderViewHost* current_rvh_; 58 59 // Used to determine what cursor we should display when dragging over web 60 // content area. This can be updated async during a drag operation. 61 WebKit::WebDragOperation drag_cursor_; 62 63 // A special drop target handler for when we try to d&d while an interstitial 64 // page is showing. 65 scoped_ptr<InterstitialDropTarget> interstitial_drop_target_; 66 67 DISALLOW_COPY_AND_ASSIGN(WebDropTarget); 68}; 69 70#endif // CHROME_BROWSER_TAB_CONTENTS_WEB_DROP_TARGET_WIN_H_ 71