/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Qt Software Information (qt-info@nokia.com) ** ** This file is part of the Graphics Dojo project on Qt Labs. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 or 3.0 as published by the Free Software Foundation ** and appearing in the file LICENSE.GPL included in the packaging of ** this file. Please review the following information to ensure GNU ** General Public Licensing requirements will be met: ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and ** http://www.gnu.org/copyleft/gpl.html. ** ** If you are unsure which license is appropriate for your use, please ** contact the sales department at qt-sales@nokia.com. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #include #include #include #if QT_VERSION < 0x0040500 #error You need Qt 4.5 or newer #endif // how long (milliseconds) the user need to hold (after a tap on the screen) // before triggering the magnifying glass feature // 701, a prime number, is the sum of 229, 233, 239 // (all three are also prime numbers, consecutive!) #define HOLD_TIME 701 // maximum size of the magnifier // Hint: see above to find why I picked this one :) #define MAX_MAGNIFIER 229 #define MAP_HTML "" \ "" \ "" \ "

" \ "" class GMaps: public QWebView { Q_OBJECT private: bool pressed; bool snapped; QPoint pressPos; QPoint dragPos; QBasicTimer tapTimer; bool zoomed; QWebPage *zoomPage; QPixmap zoomPixmap; QPixmap maskPixmap; public: GMaps(QWidget *parent = 0) : QWebView(parent) , pressed(false) , snapped(false) , zoomed(false) { zoomPage = new QWebPage(this); connect(zoomPage, SIGNAL(repaintRequested(QRect)), SLOT(update())); QString content = MAP_HTML; QWebFrame *frame = page()->mainFrame(); frame->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff); frame->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff); frame->setHtml(content); frame = zoomPage->mainFrame(); frame->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff); frame->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff); content.replace("zoom: 15", "zoom: 16"); frame->setHtml(content); QTimer::singleShot(1000, this, SLOT(triggerLoading())); } void setCenter(qreal latitude, qreal longitude) { QString code = "map.set_center(new google.maps.LatLng(%1, %2));"; QWebFrame *frame = page()->mainFrame(); frame->evaluateJavaScript(code.arg(latitude).arg(longitude)); frame = zoomPage->mainFrame(); frame->evaluateJavaScript(code.arg(latitude).arg(longitude)); } private slots: void triggerLoading() { QString code = "init(59.9138204, 10.7387413)"; QWebFrame *frame = page()->mainFrame(); frame->evaluateJavaScript(code); frame = zoomPage->mainFrame(); frame->evaluateJavaScript(code); } protected: void timerEvent(QTimerEvent *event) { QWebView::timerEvent(event); if (!zoomed) { zoomed = true; tapTimer.stop(); zoomPage->setViewportSize(size() * 2); QWebFrame *frame = page()->mainFrame(); qreal lat = frame->evaluateJavaScript("map.get_center().lat()").toDouble(); qreal lng = frame->evaluateJavaScript("map.get_center().lng()").toDouble(); setCenter(lat, lng); } update(); } void mousePressEvent(QMouseEvent *event) { pressed = snapped = true; pressPos = dragPos = event->pos(); tapTimer.stop(); tapTimer.start(HOLD_TIME, this); QWebView::mousePressEvent(event); } void mouseReleaseEvent(QMouseEvent *event) { pressed = snapped = false; tapTimer.stop(); if (!zoomed) { QWebView::mouseReleaseEvent(event); } else { zoomed = false; event->accept(); update(); // fake at the press position QMouseEvent *ev = new QMouseEvent(QEvent::MouseButtonRelease, pressPos, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier); QWebView::mouseReleaseEvent(ev); delete ev; } } void mouseMoveEvent(QMouseEvent *event) { if (!zoomed) { if (!pressed || !snapped) { QWebView::mouseMoveEvent(event); return; } else { const int threshold = 40; QPoint delta = event->pos() - pressPos; if (snapped) { snapped &= delta.x() < threshold; snapped &= delta.y() < threshold; snapped &= delta.x() > -threshold; snapped &= delta.y() > -threshold; } if (!snapped) tapTimer.stop(); } } else { dragPos = event->pos(); update(); } } void paintEvent(QPaintEvent *event) { QWebView::paintEvent(event); if (zoomed) { int dim = qMin(width(), height()); int magnifierSize = qMin(MAX_MAGNIFIER, dim * 2 / 3); int radius = magnifierSize / 2; int ring = radius - 15; QSize box = QSize(magnifierSize, magnifierSize); // reupdate our mask if (maskPixmap.size() != box) { maskPixmap = QPixmap(box); maskPixmap.fill(Qt::transparent); QRadialGradient g; g.setCenter(radius, radius); g.setFocalPoint(radius, radius); g.setRadius(radius); g.setColorAt(1.0, QColor(255, 255, 255, 0)); g.setColorAt(0.5, QColor(128, 128, 128, 255)); QPainter mask(&maskPixmap); mask.setRenderHint(QPainter::Antialiasing); mask.setCompositionMode(QPainter::CompositionMode_Source); mask.setBrush(g); mask.setPen(Qt::NoPen); mask.drawRect(maskPixmap.rect()); mask.setBrush(QColor(Qt::transparent)); mask.drawEllipse(g.center(), ring, ring); mask.end(); } QPoint center = dragPos - QPoint(0, radius); center = center + QPoint(0, radius / 2); QPoint corner = center - QPoint(radius, radius); QPoint xy = center * 2 - QPoint(radius, radius); if (zoomPixmap.size() != box) { zoomPixmap = QPixmap(box); zoomPixmap.fill(Qt::lightGray); } if (true) { QPainter p(&zoomPixmap); p.translate(-xy); QWebFrame *frame = zoomPage->mainFrame(); frame->render(&p, QRect(xy, box)); p.end(); } QPainterPath clipPath; clipPath.addEllipse(center, ring, ring); QPainter p(this); p.setRenderHint(QPainter::Antialiasing); p.setClipPath(clipPath); p.drawPixmap(corner, zoomPixmap); p.setClipping(false); p.drawPixmap(corner, maskPixmap); p.setPen(Qt::gray); p.drawPath(clipPath); p.end(); } } }; class MapZoom : public QMainWindow { Q_OBJECT private: GMaps *map; public: MapZoom(): QMainWindow(0) { map = new GMaps(this); setCentralWidget(map); QMenu *menu = menuBar()->addMenu("&Place"); menu->addAction("&Oslo", this, SLOT(chooseOslo())); menu->addAction("&Berlin", this, SLOT(chooseBerlin())); menu->addAction("&Jakarta", this, SLOT(chooseJakarta())); } private slots: void chooseOslo() { map->setCenter(59.9138204, 10.7387413); } void chooseBerlin() { map->setCenter(52.5056819, 13.3232027); } void chooseJakarta() { map->setCenter(-6.211544, 106.845172); } }; #include "mapzoom.moc" int main(int argc, char **argv) { #if defined(Q_WS_X11) QApplication::setGraphicsSystem("raster"); #endif QApplication app(argc, argv); MapZoom w; w.setWindowTitle("Maps (powered by Google)"); w.resize(600, 450); w.show(); return app.exec(); }