WebDropSource.cpp revision 65f03d4f644ce73618e5f4f50dd694b26f55ae12 
1/*
2 * Copyright (C) 2007 Apple Inc.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "WebDropSource.h"
28
29#include "WebKitDLL.h"
30#include "WebView.h"
31
32#include <WebCore/Cursor.h>
33#include <WebCore/DragActions.h>
34#include <WebCore/EventHandler.h>
35#include <WebCore/Frame.h>
36#include <WebCore/FrameView.h>
37#include <WebCore/Page.h>
38#include <WebCore/PlatformMouseEvent.h>
39#include <wtf/CurrentTime.h>
40
41#include <Windows.h>
42
43using namespace WebCore;
44
45
46HRESULT WebDropSource::createInstance(WebView* webView, IDropSource** result)
47{
48    if (!webView || !result)
49        return E_INVALIDARG;
50    *result = new WebDropSource(webView);
51    return S_OK;
52}
53
54WebDropSource::WebDropSource(WebView* webView)
55: m_ref(1)
56, m_dropped(false)
57, m_webView(webView)
58{
59    gClassCount++;
60    gClassNameCount.add("WebDropSource");
61}
62
63WebDropSource::~WebDropSource()
64{
65    gClassCount--;
66    gClassNameCount.remove("WebDropSource");
67}
68
69STDMETHODIMP WebDropSource::QueryInterface(REFIID riid, void** ppvObject)
70{
71    *ppvObject = 0;
72    if (IsEqualIID(riid, IID_IUnknown) ||
73        IsEqualIID(riid, IID_IDropSource)) {
74        *ppvObject = this;
75        AddRef();
76
77        return S_OK;
78    }
79
80    return E_NOINTERFACE;
81}
82
83STDMETHODIMP_(ULONG) WebDropSource::AddRef(void)
84{
85    return InterlockedIncrement(&m_ref);
86}
87
88STDMETHODIMP_(ULONG) WebDropSource::Release(void)
89{
90    long c = InterlockedDecrement(&m_ref);
91    if (c == 0)
92        delete this;
93    return c;
94}
95
96PlatformMouseEvent generateMouseEvent(WebView* webView, bool isDrag) {
97    POINTL pt;
98    ::GetCursorPos((LPPOINT)&pt);
99    POINTL localpt = pt;
100    HWND viewWindow;
101    if (SUCCEEDED(webView->viewWindow((OLE_HANDLE*)&viewWindow)))
102        ::ScreenToClient(viewWindow, (LPPOINT)&localpt);
103    return PlatformMouseEvent(IntPoint(localpt.x, localpt.y), IntPoint(pt.x, pt.y),
104        isDrag ? LeftButton : NoButton, MouseEventMoved, 0, false, false, false, false, currentTime());
105}
106
107STDMETHODIMP WebDropSource::QueryContinueDrag(BOOL fEscapePressed, DWORD grfKeyState)
108{
109    if (fEscapePressed || !(grfKeyState & (MK_LBUTTON|MK_RBUTTON))) {
110        m_dropped = !fEscapePressed;
111        return fEscapePressed? DRAGDROP_S_CANCEL : DRAGDROP_S_DROP;
112    }
113
114    return S_OK;
115}
116
117STDMETHODIMP WebDropSource::GiveFeedback(DWORD dwEffect)
118{
119    BOOL showCustomCursors;
120    if (FAILED(WebPreferences::sharedStandardPreferences()->customDragCursorsEnabled(&showCustomCursors)))
121        return DRAGDROP_S_USEDEFAULTCURSORS;
122
123    // If we don't want to hide the stop icon, let Windows select the cursor.
124    if (!showCustomCursors)
125        return DRAGDROP_S_USEDEFAULTCURSORS;
126
127    // If we are going to show something other than the not allowed arrow, then let Windows
128    // show the cursor.
129    if (dwEffect != DROPEFFECT_NONE)
130        return DRAGDROP_S_USEDEFAULTCURSORS;
131
132    HWND viewWindow;
133    if (FAILED(m_webView->viewWindow(reinterpret_cast<OLE_HANDLE*>(&viewWindow))))
134        return DRAGDROP_S_USEDEFAULTCURSORS;
135
136    RECT webViewRect;
137    GetWindowRect(viewWindow, &webViewRect);
138
139    POINT cursorPoint;
140    GetCursorPos(&cursorPoint);
141
142    if (!PtInRect(&webViewRect, cursorPoint)) {
143        // If our cursor is outside the bounds of the webView, we want to let Windows select the cursor.
144        return DRAGDROP_S_USEDEFAULTCURSORS;
145    }
146
147    FrameView* view = m_webView->page()->mainFrame()->view();
148    if (!view)
149        return DRAGDROP_S_USEDEFAULTCURSORS;
150
151    // When dragging inside a WebView and the drag is not allowed, don't show the not allowed icon,
152    // instead, show the pointer cursor.
153    // FIXME <rdar://7577595>: Custom cursors aren't supported during drag and drop (default to pointer).
154    view->setCursor(pointerCursor());
155    return S_OK;
156}
157