| /**************************************************************************** |
| ** |
| ** Copyright (C) 2018 The Qt Company Ltd. |
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| ** This file is part of the test suite of the Qt Toolkit. |
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| |
| #include <QtWidgets> |
| |
| class TouchableItem : public QGraphicsRectItem |
| { |
| public: |
| TouchableItem() : QGraphicsRectItem(50, 50, 400, 400) |
| { |
| setBrush(Qt::yellow); |
| setAcceptTouchEvents(true); |
| } |
| protected: |
| bool sceneEvent(QEvent *e) |
| { |
| const bool ret = QGraphicsRectItem::sceneEvent(e); |
| switch (e->type()) { |
| case QEvent::TouchBegin: |
| case QEvent::TouchUpdate: |
| case QEvent::TouchEnd: |
| { |
| QTouchEvent *te = static_cast<QTouchEvent *>(e); |
| for (const QTouchEvent::TouchPoint &tp : te->touchPoints()) { |
| QGraphicsEllipseItem *diameterItem = nullptr; |
| QSizeF ellipse = tp.ellipseDiameters(); |
| if (ellipse.isNull()) { |
| ellipse = QSizeF(5, 5); |
| } else { |
| diameterItem = new QGraphicsEllipseItem(QRectF(tp.pos().x() - ellipse.width() / 2, tp.pos().y() - ellipse.height() / 2, |
| ellipse.width(), ellipse.height()), this); |
| diameterItem->setPen(QPen(Qt::red)); |
| diameterItem->setBrush(QBrush(Qt::red)); |
| if (ellipse.width() > qreal(2) && ellipse.height() > qreal(2)) |
| ellipse.scale(ellipse.width() - 2, ellipse.height() - 2, Qt::IgnoreAspectRatio); |
| } |
| QGraphicsItem *parent = diameterItem ? static_cast<QGraphicsItem *>(diameterItem) : static_cast<QGraphicsItem *>(this); |
| QGraphicsEllipseItem *ellipseItem = new QGraphicsEllipseItem(QRectF(tp.pos().x() - ellipse.width() / 2, |
| tp.pos().y() - ellipse.height() / 2, |
| ellipse.width(), ellipse.height()), parent); |
| ellipseItem->setPen(QPen(Qt::blue)); |
| ellipseItem->setBrush(QBrush(Qt::blue)); |
| } |
| te->accept(); |
| return true; |
| } |
| default: |
| break; |
| } |
| return ret; |
| } |
| }; |
| |
| int main(int argc, char **argv) |
| { |
| QApplication a(argc, argv); |
| QMainWindow mw; |
| QWidget *w = new QWidget; |
| QVBoxLayout *vbox = new QVBoxLayout; |
| vbox->addWidget(new QLabel("The blue ellipses should indicate touch point contact patches")); |
| qDebug() << "Touch devices:"; |
| for (const QTouchDevice *device : QTouchDevice::devices()) { |
| QString result; |
| QTextStream str(&result); |
| str << (device->type() == QTouchDevice::TouchScreen ? "TouchScreen" : "TouchPad") |
| << " \"" << device->name() << "\", max " << device->maximumTouchPoints() |
| << " touch points, capabilities:"; |
| const QTouchDevice::Capabilities capabilities = device->capabilities(); |
| if (capabilities & QTouchDevice::Position) |
| str << " Position"; |
| if (capabilities & QTouchDevice::Area) |
| str << " Area"; |
| if (capabilities & QTouchDevice::Pressure) |
| str << " Pressure"; |
| if (capabilities & QTouchDevice::Velocity) |
| str << " Velocity"; |
| if (capabilities & QTouchDevice::RawPositions) |
| str << " RawPositions"; |
| if (capabilities & QTouchDevice::NormalizedPosition) |
| str << " NormalizedPosition"; |
| if (capabilities & QTouchDevice::MouseEmulation) |
| str << " MouseEmulation"; |
| vbox->addWidget(new QLabel(result)); |
| qDebug() << " " << result; |
| } |
| QGraphicsView *view = new QGraphicsView; |
| view->viewport()->setAttribute(Qt::WA_AcceptTouchEvents); |
| QGraphicsScene *scene = new QGraphicsScene(0, 0, 500, 500); |
| TouchableItem *touchableItem = new TouchableItem; |
| scene->addItem(touchableItem); |
| view->setScene(scene); |
| vbox->addWidget(view); |
| w->setLayout(vbox); |
| mw.setCentralWidget(w); |
| QMenu *menu = mw.menuBar()->addMenu("Menu"); |
| QAction *clear = new QAction("Clear"); |
| QObject::connect(clear, &QAction::triggered, [=]() { |
| qDeleteAll(touchableItem->childItems()); |
| }); |
| menu->addAction(clear); |
| QAction *ignoreTransform = new QAction("Ignore transformations"); |
| QObject::connect(ignoreTransform, &QAction::triggered, [=]() { |
| view->scale(1.5, 1.5); |
| touchableItem->setFlag(QGraphicsItem::ItemIgnoresTransformations); |
| }); |
| menu->addAction(ignoreTransform); |
| QAction *quit = new QAction("Quit"); |
| quit->setShortcut(QKeySequence::Quit); |
| QObject::connect(quit, &QAction::triggered, &QApplication::quit); |
| menu->addAction(quit); |
| mw.show(); |
| |
| return a.exec(); |
| } |
| |
| |