1/*
2 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
3 * Copyright (C) 2009 Girish Ramakrishnan <girish@forwardbias.in>
4 * Copyright (C) 2006 George Staikos <staikos@kde.org>
5 * Copyright (C) 2006 Dirk Mueller <mueller@kde.org>
6 * Copyright (C) 2006 Zack Rusin <zack@kde.org>
7 * Copyright (C) 2006 Simon Hausmann <hausmann@kde.org>
8 *
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
21 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
28 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include "webview.h"
34
35#include <QtGui>
36#include <QGraphicsScene>
37
38WebViewGraphicsBased::WebViewGraphicsBased(QWidget* parent)
39    : QGraphicsView(parent)
40    , m_item(new GraphicsWebView)
41    , m_numPaintsTotal(0)
42    , m_numPaintsSinceLastMeasure(0)
43    , m_measureFps(false)
44    , m_resizesToContents(false)
45    , m_machine(0)
46{
47    setScene(new QGraphicsScene(this));
48    scene()->addItem(m_item);
49    scene()->setFocusItem(m_item);
50
51    setFrameShape(QFrame::NoFrame);
52    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
53    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
54
55    m_updateTimer = new QTimer(this);
56    m_updateTimer->setInterval(1000);
57    connect(m_updateTimer, SIGNAL(timeout()), this, SLOT(updateFrameRate()));
58}
59
60void WebViewGraphicsBased::setPage(QWebPage* page)
61{
62    connect(page->mainFrame(), SIGNAL(contentsSizeChanged(const QSize&)), SLOT(contentsSizeChanged(const QSize&)));
63    connect(page, SIGNAL(scrollRequested(int, int, const QRect&)), SLOT(scrollRequested(int, int)));
64    graphicsWebView()->setPage(page);
65}
66
67void WebViewGraphicsBased::scrollRequested(int x, int y)
68{
69    if (!m_resizesToContents)
70        return;
71
72    // Turn off interactive mode while scrolling, or QGraphicsView will replay the
73    // last mouse event which may cause WebKit to initiate a drag operation.
74    bool interactive = isInteractive();
75    setInteractive(false);
76
77    verticalScrollBar()->setValue(-y);
78    horizontalScrollBar()->setValue(-x);
79
80    setInteractive(interactive);
81}
82
83void WebViewGraphicsBased::contentsSizeChanged(const QSize& size)
84{
85    if (m_resizesToContents)
86        scene()->setSceneRect(0, 0, size.width(), size.height());
87}
88
89void WebViewGraphicsBased::setResizesToContents(bool b)
90{
91    if (b == m_resizesToContents)
92        return;
93
94    m_resizesToContents = b;
95    graphicsWebView()->setResizesToContents(m_resizesToContents);
96
97    // When setting resizesToContents ON, our web view widget will always size as big as the
98    // web content being displayed, and so will the QWebPage's viewport. It implies that internally
99    // WebCore will work as if there was no content rendered offscreen, and then no scrollbars need
100    // drawing. In order to keep scrolling working, we:
101    //
102    // 1) Set QGraphicsView's scrollbars policy back to 'auto'.
103    // 2) Set scene's boundaries rect to an invalid size, which automatically makes it to be as big
104    //    as it needs to enclose all items onto it. We do that because QGraphicsView also calculates
105    //    the size of its scrollable area according to the amount of content in scene that is rendered
106    //    offscreen.
107    // 3) Set QWebPage's preferredContentsSize according to the size of QGraphicsView's viewport,
108    //    so WebCore properly lays pages out.
109    //
110    // On the other hand, when toggling resizesToContents OFF, we set back the default values, as
111    // opposite as described above.
112    if (m_resizesToContents) {
113        setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
114        setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
115        graphicsWebView()->page()->setPreferredContentsSize(size());
116        QRectF itemRect(graphicsWebView()->geometry().topLeft(), graphicsWebView()->page()->mainFrame()->contentsSize());
117        graphicsWebView()->setGeometry(itemRect);
118        scene()->setSceneRect(itemRect);
119    } else {
120        setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
121        setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
122        graphicsWebView()->page()->setPreferredContentsSize(QSize());
123        QRect viewportRect(QPoint(0, 0), size());
124        graphicsWebView()->setGeometry(viewportRect);
125        scene()->setSceneRect(viewportRect);
126    }
127}
128
129void WebViewGraphicsBased::resizeEvent(QResizeEvent* event)
130{
131    QGraphicsView::resizeEvent(event);
132
133    QSize size(event->size());
134
135    if (m_resizesToContents) {
136        graphicsWebView()->page()->setPreferredContentsSize(size);
137        return;
138    }
139
140    QRectF rect(QPoint(0, 0), size);
141    graphicsWebView()->setGeometry(rect);
142    scene()->setSceneRect(rect);
143}
144
145void WebViewGraphicsBased::setFrameRateMeasurementEnabled(bool enabled)
146{
147    m_measureFps = enabled;
148    if (m_measureFps) {
149        m_lastConsultTime = m_startTime = QTime::currentTime();
150        m_fpsTimer.start();
151        m_updateTimer->start();
152    } else {
153        m_fpsTimer.stop();
154        m_updateTimer->stop();
155    }
156}
157
158void WebViewGraphicsBased::updateFrameRate()
159{
160    const QTime now = QTime::currentTime();
161    int interval = m_lastConsultTime.msecsTo(now);
162    int frames = m_fpsTimer.numFrames(interval);
163    int current = interval ? frames * 1000 / interval : 0;
164
165    emit currentFPSUpdated(current);
166
167    m_lastConsultTime = now;
168}
169
170void WebViewGraphicsBased::animatedFlip()
171{
172#ifndef QT_NO_ANIMATION
173    QSizeF center = graphicsWebView()->boundingRect().size() / 2;
174    QPointF centerPoint = QPointF(center.width(), center.height());
175    graphicsWebView()->setTransformOriginPoint(centerPoint);
176
177    QPropertyAnimation* animation = new QPropertyAnimation(graphicsWebView(), "rotation", this);
178    animation->setDuration(1000);
179
180    int rotation = int(graphicsWebView()->rotation());
181
182    animation->setStartValue(rotation);
183    animation->setEndValue(rotation + 180 - (rotation % 180));
184
185    animation->start(QAbstractAnimation::DeleteWhenStopped);
186#endif
187}
188
189void WebViewGraphicsBased::animatedYFlip()
190{
191#ifndef QT_NO_ANIMATION
192    if (!m_machine) {
193        m_machine = new QStateMachine(this);
194
195        QState* s0 = new QState(m_machine);
196        s0->assignProperty(this, "yRotation", 0);
197
198        QState* s1 = new QState(m_machine);
199        s1->assignProperty(this, "yRotation", 90);
200
201        QAbstractTransition* t1 = s0->addTransition(s1);
202        QPropertyAnimation* yRotationAnim = new QPropertyAnimation(this, "yRotation", this);
203        t1->addAnimation(yRotationAnim);
204
205        QState* s2 = new QState(m_machine);
206        s2->assignProperty(this, "yRotation", -90);
207        s1->addTransition(s1, SIGNAL(propertiesAssigned()), s2);
208
209        QState* s3 = new QState(m_machine);
210        s3->assignProperty(this, "yRotation", 0);
211
212        QAbstractTransition* t2 = s2->addTransition(s3);
213        t2->addAnimation(yRotationAnim);
214
215        QFinalState* final = new QFinalState(m_machine);
216        s3->addTransition(s3, SIGNAL(propertiesAssigned()), final);
217
218        m_machine->setInitialState(s0);
219        yRotationAnim->setDuration(1000);
220    }
221
222    m_machine->start();
223#endif
224}
225
226void WebViewGraphicsBased::paintEvent(QPaintEvent* event)
227{
228    QGraphicsView::paintEvent(event);
229    if (!m_measureFps)
230        return;
231}
232
233static QMenu* createContextMenu(QWebPage* page, QPoint position)
234{
235    QMenu* menu = page->createStandardContextMenu();
236
237    QWebHitTestResult r = page->mainFrame()->hitTestContent(position);
238
239    if (!r.linkUrl().isEmpty()) {
240        WebPage* webPage = qobject_cast<WebPage*>(page);
241        QAction* newTabAction = menu->addAction("Open in Default &Browser", webPage, SLOT(openUrlInDefaultBrowser()));
242        newTabAction->setData(r.linkUrl());
243        menu->insertAction(menu->actions().at(2), newTabAction);
244    }
245    return menu;
246}
247
248void GraphicsWebView::mousePressEvent(QGraphicsSceneMouseEvent* event)
249{
250    setProperty("mouseButtons", QVariant::fromValue(int(event->buttons())));
251    setProperty("keyboardModifiers", QVariant::fromValue(int(event->modifiers())));
252
253    QGraphicsWebView::mousePressEvent(event);
254}
255
256void WebViewTraditional::mousePressEvent(QMouseEvent* event)
257{
258    setProperty("mouseButtons", QVariant::fromValue(int(event->buttons())));
259    setProperty("keyboardModifiers", QVariant::fromValue(int(event->modifiers())));
260
261    QWebView::mousePressEvent(event);
262}
263
264void GraphicsWebView::contextMenuEvent(QGraphicsSceneContextMenuEvent* event)
265{
266    QMenu* menu = createContextMenu(page(), event->pos().toPoint());
267    menu->exec(event->screenPos());
268    delete menu;
269}
270
271void WebViewTraditional::contextMenuEvent(QContextMenuEvent* event)
272{
273    QMenu* menu = createContextMenu(page(), event->pos());
274    menu->exec(event->globalPos());
275    delete menu;
276}
277
278