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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "config.h"
30#include "WebNodeHighlight.h"
31
32#include "WebView.h"
33#pragma warning(push, 0)
34#include <WebCore/BitmapInfo.h>
35#include <WebCore/Color.h>
36#include <WebCore/GraphicsContext.h>
37#include <WebCore/InspectorController.h>
38#include <WebCore/Page.h>
39#include <WebCore/WindowMessageBroadcaster.h>
40#pragma warning(pop)
41#include <wtf/OwnPtr.h>
42#include <wtf/HashSet.h>
43
44using namespace WebCore;
45
46static LPCTSTR kOverlayWindowClassName = TEXT("WebNodeHighlightWindowClass");
47static ATOM registerOverlayClass();
48static LPCTSTR kWebNodeHighlightPointerProp = TEXT("WebNodeHighlightPointer");
49
50WebNodeHighlight::WebNodeHighlight(WebView* webView)
51    : m_inspectedWebView(webView)
52    , m_overlay(0)
53    , m_observedWindow(0)
54    , m_showsWhileWebViewIsVisible(false)
55{
56    m_inspectedWebView->viewWindow(reinterpret_cast<OLE_HANDLE*>(&m_inspectedWebViewWindow));
57}
58
59WebNodeHighlight::~WebNodeHighlight()
60{
61    if (m_observedWindow)
62        WindowMessageBroadcaster::removeListener(m_observedWindow, this);
63    if (m_inspectedWebViewWindow)
64        WindowMessageBroadcaster::removeListener(m_inspectedWebViewWindow, this);
65
66    if (m_overlay)
67        ::DestroyWindow(m_overlay);
68}
69
70void WebNodeHighlight::setShowsWhileWebViewIsVisible(bool shows)
71{
72    if (m_showsWhileWebViewIsVisible == shows)
73        return;
74    m_showsWhileWebViewIsVisible = shows;
75
76    if (!m_showsWhileWebViewIsVisible) {
77        hide();
78        return;
79    }
80
81    bool webViewVisible = isWebViewVisible();
82
83    if (isShowing() == webViewVisible)
84        return;
85
86    if (webViewVisible)
87        show();
88    else
89        hide();
90}
91
92bool WebNodeHighlight::isWebViewVisible() const
93{
94    if (!m_inspectedWebViewWindow)
95        return false;
96
97    return IsWindowVisible(m_inspectedWebViewWindow);
98}
99
100void WebNodeHighlight::show()
101{
102    if (!m_overlay) {
103        registerOverlayClass();
104
105        m_overlay = ::CreateWindowEx(WS_EX_LAYERED | WS_EX_TOOLWINDOW | WS_EX_TRANSPARENT, kOverlayWindowClassName, 0, WS_POPUP,
106                                     0, 0, 0, 0,
107                                     m_inspectedWebViewWindow, 0, 0, 0);
108        if (!m_overlay)
109            return;
110
111        ::SetProp(m_overlay, kWebNodeHighlightPointerProp, reinterpret_cast<HANDLE>(this));
112
113        m_observedWindow = GetAncestor(m_inspectedWebViewWindow, GA_ROOT);
114        WindowMessageBroadcaster::addListener(m_observedWindow, this);
115        WindowMessageBroadcaster::addListener(m_inspectedWebViewWindow, this);
116    }
117
118    ASSERT(m_showsWhileWebViewIsVisible);
119
120    update();
121    SetWindowPos(m_overlay, 0, 0, 0, 0, 0, SWP_SHOWWINDOW | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
122}
123
124void WebNodeHighlight::hide()
125{
126    if (m_overlay)
127        ::ShowWindow(m_overlay, SW_HIDE);
128}
129
130bool WebNodeHighlight::isShowing() const
131{
132    return m_overlay && ::IsWindowVisible(m_overlay);
133}
134
135void WebNodeHighlight::update()
136{
137    ASSERT(m_overlay);
138
139    HDC hdc = ::CreateCompatibleDC(::GetDC(m_overlay));
140    if (!hdc)
141        return;
142
143    RECT webViewRect;
144    ::GetWindowRect(m_inspectedWebViewWindow, &webViewRect);
145
146    SIZE size;
147    size.cx = webViewRect.right - webViewRect.left;
148    size.cy = webViewRect.bottom - webViewRect.top;
149
150    BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(IntSize(size));
151
152    void* pixels = 0;
153    OwnPtr<HBITMAP> hbmp(::CreateDIBSection(hdc, &bitmapInfo, DIB_RGB_COLORS, &pixels, 0, 0));
154
155    ::SelectObject(hdc, hbmp.get());
156
157    GraphicsContext context(hdc);
158
159    m_inspectedWebView->page()->inspectorController()->drawNodeHighlight(context);
160
161    BLENDFUNCTION bf;
162    bf.BlendOp = AC_SRC_OVER;
163    bf.BlendFlags = 0;
164    bf.SourceConstantAlpha = 255;
165    bf.AlphaFormat = AC_SRC_ALPHA;
166
167    POINT srcPoint;
168    srcPoint.x = 0;
169    srcPoint.y = 0;
170
171    POINT dstPoint;
172    dstPoint.x = webViewRect.left;
173    dstPoint.y = webViewRect.top;
174
175    ::UpdateLayeredWindow(m_overlay, ::GetDC(0), &dstPoint, &size, hdc, &srcPoint, 0, &bf, ULW_ALPHA);
176
177    ::DeleteDC(hdc);
178}
179
180void WebNodeHighlight::placeBehindWindow(HWND window)
181{
182    ASSERT(m_overlay);
183    SetWindowPos(m_overlay, window, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
184}
185
186static ATOM registerOverlayClass()
187{
188    static bool haveRegisteredWindowClass = false;
189
190    if (haveRegisteredWindowClass)
191        return true;
192
193    WNDCLASSEX wcex;
194
195    wcex.cbSize = sizeof(WNDCLASSEX);
196
197    wcex.style          = 0;
198    wcex.lpfnWndProc    = OverlayWndProc;
199    wcex.cbClsExtra     = 0;
200    wcex.cbWndExtra     = 0;
201    wcex.hInstance      = 0;
202    wcex.hIcon          = 0;
203    wcex.hCursor        = LoadCursor(0, IDC_ARROW);
204    wcex.hbrBackground  = 0;
205    wcex.lpszMenuName   = 0;
206    wcex.lpszClassName  = kOverlayWindowClassName;
207    wcex.hIconSm        = 0;
208
209    haveRegisteredWindowClass = true;
210
211    return ::RegisterClassEx(&wcex);
212}
213
214LRESULT CALLBACK OverlayWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
215{
216    WebNodeHighlight* highlight = reinterpret_cast<WebNodeHighlight*>(::GetProp(hwnd, kWebNodeHighlightPointerProp));
217    if (!highlight)
218        return ::DefWindowProc(hwnd, msg, wParam, lParam);
219
220    return ::DefWindowProc(hwnd, msg, wParam, lParam);
221}
222
223void WebNodeHighlight::onWebViewShowWindow(bool showing)
224{
225    if (!m_showsWhileWebViewIsVisible)
226        return;
227
228    if (isShowing() == showing)
229        return;
230
231    if (showing)
232        show();
233    else
234        hide();
235}
236
237void WebNodeHighlight::onWebViewWindowPosChanged(WINDOWPOS* windowPos)
238{
239    bool sizing = !(windowPos->flags & SWP_NOSIZE);
240
241    if (!sizing)
242        return;
243
244    if (!isShowing())
245        return;
246
247    update();
248}
249
250void WebNodeHighlight::onRootWindowPosChanged(WINDOWPOS* windowPos)
251{
252    bool moving = !(windowPos->flags & SWP_NOMOVE);
253    bool sizing = !(windowPos->flags & SWP_NOSIZE);
254
255    if (!moving)
256        return;
257
258    // Size changes are handled by onWebViewWindowPosChanged.
259    if (sizing)
260        return;
261
262    if (!isShowing())
263        return;
264
265    update();
266}
267
268void WebNodeHighlight::windowReceivedMessage(HWND window, UINT msg, WPARAM wParam, LPARAM lParam)
269{
270    if (window == m_inspectedWebViewWindow) {
271        switch (msg) {
272            case WM_SHOWWINDOW:
273                onWebViewShowWindow(wParam);
274                break;
275            case WM_WINDOWPOSCHANGED:
276                onWebViewWindowPosChanged(reinterpret_cast<WINDOWPOS*>(lParam));
277                break;
278            default:
279                break;
280        }
281
282        return;
283    }
284
285    ASSERT(window == m_observedWindow);
286    switch (msg) {
287        case WM_WINDOWPOSCHANGED:
288            onRootWindowPosChanged(reinterpret_cast<WINDOWPOS*>(lParam));
289            break;
290        default:
291            break;
292    }
293}
294