6.5.3 clean

tests/manual/examples/widgets/touch/dials/CMakeLists.txt

@@ -0,0 +1,37 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(dials LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/touch/dials")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(dials
+    dials.ui
+    main.cpp
+)
+
+set_target_properties(dials PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(dials PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS dials
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

tests/manual/examples/widgets/touch/dials/dials.pro

@@ -0,0 +1,8 @@
+QT += widgets
+
+SOURCES += main.cpp
+FORMS += dials.ui
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/touch/dials
+INSTALLS += target

tests/manual/examples/widgets/touch/dials/dials.ui

@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Dials</class>
+ <widget class="QWidget" name="Dials">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0">
+    <widget class="QDial" name="dial_1">
+     <property name="notchesVisible">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="1">
+    <widget class="QDial" name="dial_2">
+     <property name="notchesVisible">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="2">
+    <widget class="QDial" name="dial_3">
+     <property name="notchesVisible">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="3">
+    <widget class="QDial" name="dial_4">
+     <property name="notchesVisible">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="0">
+    <widget class="QDial" name="dial_5">
+     <property name="notchesVisible">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="1">
+    <widget class="QDial" name="dial_6">
+     <property name="notchesVisible">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="2">
+    <widget class="QDial" name="dial_7">
+     <property name="notchesVisible">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="3">
+    <widget class="QDial" name="dial_8">
+     <property name="notchesVisible">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

tests/manual/examples/widgets/touch/dials/doc/src/touch-dials.qdoc

@@ -0,0 +1,14 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
+
+/*!
+    \example touch/dials
+    \title Touch Dials Example
+    \ingroup touchinputexamples
+    \brief Shows how to apply touch to a set of standard Qt widgets.
+
+    The Touch Dials example shows how to apply touch to a set of
+    standard Qt widgets.
+
+    \image touch-dials-example.png
+*/

tests/manual/examples/widgets/touch/dials/main.cpp

@@ -0,0 +1,21 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+#include <QWidget>
+#include <QDial>
+
+#include "ui_dials.h"
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+    QWidget window;
+    Ui::Dials dialsUi;
+    dialsUi.setupUi(&window);
+    const QList<QAbstractSlider *> sliders = window.findChildren<QAbstractSlider *>();
+    for (QAbstractSlider *slider : sliders)
+        slider->setAttribute(Qt::WA_AcceptTouchEvents);
+    window.showMaximized();
+    return app.exec();
+}

tests/manual/examples/widgets/touch/fingerpaint/CMakeLists.txt

@@ -0,0 +1,45 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(fingerpaint LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/touch/fingerpaint")
+
+find_package(Qt6
+    REQUIRED COMPONENTS Core Gui Widgets
+    OPTIONAL_COMPONENTS PrintSupport
+)
+
+qt_standard_project_setup()
+
+qt_add_executable(fingerpaint
+    main.cpp
+    mainwindow.cpp mainwindow.h
+    scribblearea.cpp scribblearea.h
+)
+
+set_target_properties(fingerpaint PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(fingerpaint PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+if (TARGET Qt6::PrintSupport)
+    target_link_libraries(fingerpaint PRIVATE Qt6::PrintSupport)
+endif()
+
+install(TARGETS fingerpaint
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

tests/manual/examples/widgets/touch/fingerpaint/doc/src/fingerpaint.qdoc

@@ -0,0 +1,18 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
+
+/*!
+    \example touch/fingerpaint
+    \title Finger Paint Example
+    \ingroup touchinputexamples
+    \brief Shows the use of a touchscreen to make a simple painting application.
+
+    The Finger Paint example shows the use of a touchscreen with a custom widget
+    to create a simple painting application.
+
+    \image touch-fingerpaint-example.png
+
+    This example was specifically designed to work with a touchscreen, using
+    QTouchEvent instead of QMouseEvent to handle user input over the custom
+    widget. As a result, it is not possible to draw with the mouse cursor.
+*/

tests/manual/examples/widgets/touch/fingerpaint/fingerpaint.pro

@@ -0,0 +1,13 @@
+QT += widgets
+requires(qtConfig(filedialog))
+qtHaveModule(printsupport): QT += printsupport
+
+HEADERS       = mainwindow.h \
+                scribblearea.h
+SOURCES       = main.cpp \
+                mainwindow.cpp \
+                scribblearea.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/touch/fingerpaint
+INSTALLS += target

tests/manual/examples/widgets/touch/fingerpaint/main.cpp

@@ -0,0 +1,14 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+
+#include "mainwindow.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    MainWindow window;
+    window.showMaximized();
+    return app.exec();
+}

tests/manual/examples/widgets/touch/fingerpaint/mainwindow.cpp

@@ -0,0 +1,180 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+
+#include "mainwindow.h"
+#include "scribblearea.h"
+
+//! [0]
+MainWindow::MainWindow()
+{
+    scribbleArea = new ScribbleArea;
+    setCentralWidget(scribbleArea);
+
+    createActions();
+    createMenus();
+
+    setWindowTitle(tr("Finger Paint"));
+    resize(500, 500);
+}
+//! [0]
+
+//! [1]
+void MainWindow::closeEvent(QCloseEvent *event)
+//! [1] //! [2]
+{
+    if (maybeSave()) {
+        event->accept();
+    } else {
+        event->ignore();
+    }
+}
+//! [2]
+
+//! [3]
+void MainWindow::open()
+//! [3] //! [4]
+{
+    if (maybeSave()) {
+        QString fileName = QFileDialog::getOpenFileName(this,
+                                   tr("Open File"), QDir::currentPath());
+        if (!fileName.isEmpty())
+            scribbleArea->openImage(fileName);
+    }
+}
+//! [4]
+
+//! [5]
+void MainWindow::save()
+//! [5] //! [6]
+{
+    QAction *action = qobject_cast<QAction *>(sender());
+    QByteArray fileFormat = action->data().toByteArray();
+    saveFile(fileFormat);
+}
+//! [6]
+
+//! [11]
+void MainWindow::about()
+//! [11] //! [12]
+{
+    QMessageBox::about(this, tr("About Scribble"),
+            tr("<p>The <b>Scribble</b> example shows how to use QMainWindow as the "
+               "base widget for an application, and how to reimplement some of "
+               "QWidget's event handlers to receive the events generated for "
+               "the application's widgets:</p><p> We reimplement the mouse event "
+               "handlers to facilitate drawing, the paint event handler to "
+               "update the application and the resize event handler to optimize "
+               "the application's appearance. In addition we reimplement the "
+               "close event handler to intercept the close events before "
+               "terminating the application.</p><p> The example also demonstrates "
+               "how to use QPainter to draw an image in real time, as well as "
+               "to repaint widgets.</p>"));
+}
+//! [12]
+
+//! [13]
+void MainWindow::createActions()
+//! [13] //! [14]
+{
+    openAct = new QAction(tr("&Open..."), this);
+    openAct->setShortcut(tr("Ctrl+O"));
+    connect(openAct, &QAction::triggered, this, &MainWindow::open);
+
+    const QList<QByteArray> imageFormats = QImageWriter::supportedImageFormats();
+    for (const QByteArray &format : imageFormats) {
+        QString text = tr("%1...").arg(QString(format).toUpper());
+
+        QAction *action = new QAction(text, this);
+        action->setData(format);
+        connect(action, &QAction::triggered, this, &MainWindow::save);
+        saveAsActs.append(action);
+    }
+
+    printAct = new QAction(tr("&Print..."), this);
+    connect(printAct, &QAction::triggered, scribbleArea, &ScribbleArea::print);
+
+    exitAct = new QAction(tr("E&xit"), this);
+    exitAct->setShortcut(tr("Ctrl+Q"));
+    connect(exitAct, &QAction::triggered, this, &QWidget::close);
+
+    clearScreenAct = new QAction(tr("&Clear Screen"), this);
+    clearScreenAct->setShortcut(tr("Ctrl+L"));
+    connect(clearScreenAct, &QAction::triggered,
+            scribbleArea, &ScribbleArea::clearImage);
+
+    aboutAct = new QAction(tr("&About"), this);
+    connect(aboutAct, &QAction::triggered, this, &MainWindow::about);
+
+    aboutQtAct = new QAction(tr("About &Qt"), this);
+    connect(aboutQtAct, &QAction::triggered, qApp, &QApplication::aboutQt);
+}
+//! [14]
+
+//! [15]
+void MainWindow::createMenus()
+//! [15] //! [16]
+{
+    saveAsMenu = new QMenu(tr("&Save As"), this);
+    saveAsMenu->addActions(saveAsActs);
+
+    fileMenu = new QMenu(tr("&File"), this);
+    fileMenu->addAction(openAct);
+    fileMenu->addMenu(saveAsMenu);
+    fileMenu->addAction(printAct);
+    fileMenu->addSeparator();
+    fileMenu->addAction(exitAct);
+
+    optionMenu = new QMenu(tr("&Options"), this);
+    optionMenu->addAction(clearScreenAct);
+
+    helpMenu = new QMenu(tr("&Help"), this);
+    helpMenu->addAction(aboutAct);
+    helpMenu->addAction(aboutQtAct);
+
+    menuBar()->addMenu(fileMenu);
+    menuBar()->addMenu(optionMenu);
+    menuBar()->addMenu(helpMenu);
+}
+//! [16]
+
+//! [17]
+bool MainWindow::maybeSave()
+//! [17] //! [18]
+{
+    if (scribbleArea->isModified()) {
+       QMessageBox::StandardButton ret;
+       ret = QMessageBox::warning(this, tr("Scribble"),
+                          tr("The image has been modified.\n"
+                             "Do you want to save your changes?"),
+                          QMessageBox::Save | QMessageBox::Discard
+                          | QMessageBox::Cancel);
+        if (ret == QMessageBox::Save) {
+            return saveFile("png");
+        } else if (ret == QMessageBox::Cancel) {
+            return false;
+        }
+    }
+    return true;
+}
+//! [18]
+
+//! [19]
+bool MainWindow::saveFile(const QByteArray &fileFormat)
+//! [19] //! [20]
+{
+    QString initialPath = QDir::currentPath() + "/untitled." + fileFormat;
+
+    QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
+                               initialPath,
+                               tr("%1 Files (*.%2);;All Files (*)")
+                               .arg(QString::fromLatin1(fileFormat.toUpper()))
+                               .arg(QString::fromLatin1(fileFormat)));
+    if (fileName.isEmpty()) {
+        return false;
+    } else {
+        return scribbleArea->saveImage(fileName, fileFormat.constData());
+    }
+}
+//! [20]

tests/manual/examples/widgets/touch/fingerpaint/mainwindow.h

@@ -0,0 +1,51 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QList>
+#include <QMainWindow>
+
+class ScribbleArea;
+
+//! [0]
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow();
+
+protected:
+    void closeEvent(QCloseEvent *event) override;
+
+private slots:
+    void open();
+    void save();
+    void about();
+
+private:
+    void createActions();
+    void createMenus();
+    bool maybeSave();
+    bool saveFile(const QByteArray &fileFormat);
+
+    ScribbleArea *scribbleArea;
+
+    QMenu *saveAsMenu;
+    QMenu *fileMenu;
+    QMenu *optionMenu;
+    QMenu *helpMenu;
+
+    QAction *openAct;
+    QList<QAction *> saveAsActs;
+    QAction *exitAct;
+    QAction *printAct;
+    QAction *clearScreenAct;
+    QAction *aboutAct;
+    QAction *aboutQtAct;
+};
+//! [0]
+
+#endif

tests/manual/examples/widgets/touch/fingerpaint/scribblearea.cpp

@@ -0,0 +1,190 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QtWidgets>
+#if defined(QT_PRINTSUPPORT_LIB)
+#include <QtPrintSupport/qtprintsupportglobal.h>
+#if QT_CONFIG(printdialog)
+#include <QPrinter>
+#include <QPrintDialog>
+#endif
+#endif
+
+#include "scribblearea.h"
+
+static const qreal MinimumDiameter = 3.0;
+static const qreal MaximumDiameter = 50.0;
+
+//! [0]
+ScribbleArea::ScribbleArea(QWidget *parent)
+    : QWidget(parent)
+{
+    setAttribute(Qt::WA_AcceptTouchEvents);
+    setAttribute(Qt::WA_StaticContents);
+    modified = false;
+
+    myPenColors
+            << QColor("green")
+            << QColor("purple")
+            << QColor("red")
+            << QColor("blue")
+            << QColor("yellow")
+
+            << QColor("pink")
+            << QColor("orange")
+            << QColor("brown")
+            << QColor("grey")
+            << QColor("black");
+}
+//! [0]
+
+//! [1]
+bool ScribbleArea::openImage(const QString &fileName)
+//! [1] //! [2]
+{
+    QImage loadedImage;
+    if (!loadedImage.load(fileName))
+        return false;
+
+    QSize newSize = loadedImage.size().expandedTo(size());
+    resizeImage(&loadedImage, newSize);
+    image = loadedImage;
+    modified = false;
+    update();
+    return true;
+}
+//! [2]
+
+//! [3]
+bool ScribbleArea::saveImage(const QString &fileName, const char *fileFormat)
+//! [3] //! [4]
+{
+    QImage visibleImage = image;
+    resizeImage(&visibleImage, size());
+
+    if (visibleImage.save(fileName, fileFormat)) {
+        modified = false;
+        return true;
+    } else {
+        return false;
+    }
+}
+//! [4]
+
+//! [9]
+void ScribbleArea::clearImage()
+//! [9] //! [10]
+{
+    image.fill(qRgb(255, 255, 255));
+    modified = true;
+    update();
+}
+//! [10]
+
+//! [12] //! [13]
+void ScribbleArea::paintEvent(QPaintEvent *event)
+//! [13] //! [14]
+{
+    QPainter painter(this);
+    const QRect rect = event->rect();
+    painter.drawImage(rect.topLeft(), image, rect);
+}
+//! [14]
+
+//! [15]
+void ScribbleArea::resizeEvent(QResizeEvent *event)
+//! [15] //! [16]
+{
+    if (width() > image.width() || height() > image.height()) {
+        int newWidth = qMax(width() + 128, image.width());
+        int newHeight = qMax(height() + 128, image.height());
+        resizeImage(&image, QSize(newWidth, newHeight));
+        update();
+    }
+    QWidget::resizeEvent(event);
+}
+//! [16]
+
+//! [19]
+void ScribbleArea::resizeImage(QImage *image, const QSize &newSize)
+//! [19] //! [20]
+{
+    if (image->size() == newSize)
+        return;
+
+    QImage newImage(newSize, QImage::Format_RGB32);
+    newImage.fill(qRgb(255, 255, 255));
+    QPainter painter(&newImage);
+    painter.drawImage(QPoint(0, 0), *image);
+    *image = newImage;
+}
+//! [20]
+
+//! [21]
+void ScribbleArea::print()
+{
+#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)
+    QPrinter printer(QPrinter::HighResolution);
+
+    QPrintDialog printDialog(&printer, this);
+//! [21] //! [22]
+    if (printDialog.exec() == QDialog::Accepted) {
+        QPainter painter(&printer);
+        QRect rect = painter.viewport();
+        QSize size = image.size();
+        size.scale(rect.size(), Qt::KeepAspectRatio);
+        painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
+        painter.setWindow(image.rect());
+        painter.drawImage(0, 0, image);
+    }
+#endif // QT_CONFIG(printdialog)
+}
+//! [22]
+
+bool ScribbleArea::event(QEvent *event)
+{
+    switch (event->type()) {
+    case QEvent::TouchBegin:
+    case QEvent::TouchUpdate:
+    case QEvent::TouchEnd:
+    {
+        const QTouchEvent *touch = static_cast<QTouchEvent *>(event);
+        const auto touchPoints = static_cast<QTouchEvent *>(event)->points();
+        for (const QTouchEvent::TouchPoint &touchPoint : touchPoints) {
+            switch (touchPoint.state()) {
+            case QEventPoint::Stationary:
+            case QEventPoint::Released:
+                // don't do anything if this touch point hasn't moved or has been released
+                continue;
+            default:
+                {
+                    QSizeF diams = touchPoint.ellipseDiameters();
+                    if (diams.isEmpty()) {
+                        qreal diameter = MaximumDiameter;
+                        if (touch->pointingDevice()->capabilities().testFlag(QPointingDevice::Capability::Pressure))
+                            diameter = MinimumDiameter + (MaximumDiameter - MinimumDiameter) * touchPoint.pressure();
+                        diams = QSizeF(diameter, diameter);
+                    }
+
+                    QPainter painter(&image);
+                    painter.setPen(Qt::NoPen);
+                    painter.setBrush(myPenColors.at(touchPoint.id() % myPenColors.count()));
+                    painter.drawEllipse(touchPoint.position(), diams.width() / 2, diams.height() / 2);
+                    painter.end();
+
+                    modified = true;
+                    const int rad = 2;
+                    QRectF rect(QPointF(), diams);
+                    rect.moveCenter(touchPoint.position());
+                    update(rect.toRect().adjusted(-rad,-rad, +rad, +rad));
+                }
+                break;
+            }
+        }
+        break;
+    }
+    default:
+        return QWidget::event(event);
+    }
+    return true;
+}

tests/manual/examples/widgets/touch/fingerpaint/scribblearea.h

@@ -0,0 +1,43 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef SCRIBBLEAREA_H
+#define SCRIBBLEAREA_H
+
+#include <QColor>
+#include <QImage>
+#include <QPoint>
+#include <QWidget>
+
+//! [0]
+class ScribbleArea : public QWidget
+{
+    Q_OBJECT
+
+public:
+    ScribbleArea(QWidget *parent = nullptr);
+
+    bool openImage(const QString &fileName);
+    bool saveImage(const QString &fileName, const char *fileFormat);
+
+    bool isModified() const { return modified; }
+
+public slots:
+    void clearImage();
+    void print();
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+    void resizeEvent(QResizeEvent *event) override;
+    bool event(QEvent *event) override;
+
+private:
+    void resizeImage(QImage *image, const QSize &newSize);
+
+    bool modified;
+    QList<QColor> myPenColors;
+    QImage image;
+};
+//! [0]
+
+#endif

tests/manual/examples/widgets/touch/pinchzoom/CMakeLists.txt

@@ -0,0 +1,50 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(pinchzoom LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/touch/pinchzoom")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(pinchzoom
+    graphicsview.cpp graphicsview.h
+    main.cpp
+    mouse.cpp mouse.h
+)
+
+set_target_properties(pinchzoom PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(pinchzoom PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+# Resources:
+set(mice_resource_files
+    "images/cheese.jpg"
+)
+
+qt_add_resources(pinchzoom "mice"
+    PREFIX
+        "/"
+    FILES
+        ${mice_resource_files}
+)
+
+install(TARGETS pinchzoom
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

tests/manual/examples/widgets/touch/pinchzoom/doc/src/pinchzoom.qdoc

@@ -0,0 +1,14 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
+
+/*!
+    \example touch/pinchzoom
+    \title Pinch Zoom Example
+    \ingroup touchinputexamples
+    \brief Shows how to recognize a gesture.
+
+    The Pinch Zoom example shows how to use low-level touch information
+    to recognize a gesture.
+
+    \image touch-pinchzoom-example.png
+*/

tests/manual/examples/widgets/touch/pinchzoom/graphicsview.cpp

@@ -0,0 +1,48 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "graphicsview.h"
+
+#include <QScrollBar>
+#include <QTouchEvent>
+
+GraphicsView::GraphicsView(QGraphicsScene *scene, QWidget *parent)
+    : QGraphicsView(scene, parent)
+{
+    viewport()->setAttribute(Qt::WA_AcceptTouchEvents);
+    setDragMode(ScrollHandDrag);
+}
+
+bool GraphicsView::viewportEvent(QEvent *event)
+{
+    switch (event->type()) {
+    case QEvent::TouchBegin:
+    case QEvent::TouchUpdate:
+    case QEvent::TouchEnd:
+    {
+        QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
+        const auto touchPoints = touchEvent->points();
+        if (touchPoints.count() == 2) {
+            // determine scale factor
+            const QEventPoint &touchPoint0 = touchPoints.first();
+            const QEventPoint &touchPoint1 = touchPoints.last();
+            qreal currentScaleFactor =
+                    QLineF(touchPoint0.position(), touchPoint1.position()).length()
+                    / QLineF(touchPoint0.pressPosition(), touchPoint1.pressPosition()).length();
+            if (touchEvent->touchPointStates() & QEventPoint::Released) {
+                // if one of the fingers is released, remember the current scale
+                // factor so that adding another finger later will continue zooming
+                // by adding new scale factor to the existing remembered value.
+                totalScaleFactor *= currentScaleFactor;
+                currentScaleFactor = 1;
+            }
+            setTransform(QTransform::fromScale(totalScaleFactor * currentScaleFactor,
+                                               totalScaleFactor * currentScaleFactor));
+        }
+        return true;
+    }
+    default:
+        break;
+    }
+    return QGraphicsView::viewportEvent(event);
+}

tests/manual/examples/widgets/touch/pinchzoom/graphicsview.h

@@ -0,0 +1,18 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#pragma once
+#include <QGraphicsView>
+
+class GraphicsView : public QGraphicsView
+{
+    Q_OBJECT
+
+public:
+    GraphicsView(QGraphicsScene *scene = nullptr, QWidget *parent = nullptr);
+
+    bool viewportEvent(QEvent *event) override;
+
+private:
+    qreal totalScaleFactor = 1;
+};

tests/manual/examples/widgets/touch/pinchzoom/main.cpp

@@ -0,0 +1,47 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "graphicsview.h"
+#include "mouse.h"
+
+#include <QApplication>
+#include <cmath>
+
+static constexpr int MouseCount = 7;
+
+//! [0]
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+//! [0]
+
+//! [1]
+    QGraphicsScene scene;
+    scene.setSceneRect(-300, -300, 600, 600);
+//! [1] //! [2]
+    scene.setItemIndexMethod(QGraphicsScene::NoIndex);
+//! [2]
+
+//! [3]
+    for (int i = 0; i < MouseCount; ++i) {
+        Mouse *mouse = new Mouse;
+        mouse->setPos(::sin((i * 6.28) / MouseCount) * 200,
+                      ::cos((i * 6.28) / MouseCount) * 200);
+        scene.addItem(mouse);
+    }
+//! [3]
+
+//! [4]
+    GraphicsView view(&scene);
+    view.setRenderHint(QPainter::Antialiasing);
+    view.setBackgroundBrush(QPixmap(":/images/cheese.jpg"));
+//! [4] //! [5]
+    view.setCacheMode(QGraphicsView::CacheBackground);
+    view.setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
+//! [5] //! [6]
+    view.setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Colliding Mice"));
+    view.showMaximized();
+
+    return app.exec();
+}
+//! [6]

tests/manual/examples/widgets/touch/pinchzoom/mice.qrc

@@ -0,0 +1,5 @@
+<RCC>
+    <qresource prefix="/" >
+        <file>images/cheese.jpg</file>
+    </qresource>
+</RCC>

tests/manual/examples/widgets/touch/pinchzoom/mouse.cpp

@@ -0,0 +1,158 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "mouse.h"
+
+#include <QGraphicsScene>
+#include <QPainter>
+#include <QRandomGenerator>
+#include <QStyleOption>
+#include <qmath.h>
+
+constexpr qreal Pi = M_PI;
+constexpr qreal TwoPi = 2 * M_PI;
+
+static qreal normalizeAngle(qreal angle)
+{
+    while (angle < 0)
+        angle += TwoPi;
+    while (angle > TwoPi)
+        angle -= TwoPi;
+    return angle;
+}
+
+//! [0]
+Mouse::Mouse() : color(QRandomGenerator::global()->bounded(256),
+                       QRandomGenerator::global()->bounded(256),
+                       QRandomGenerator::global()->bounded(256))
+{
+    setTransform(QTransform().rotate(QRandomGenerator::global()->bounded(360 * 16)), true);
+    startTimer(1000 / 33);
+}
+//! [0]
+
+//! [1]
+QRectF Mouse::boundingRect() const
+{
+    qreal adjust = 0.5;
+    return QRectF(-18 - adjust, -22 - adjust,
+                  36 + adjust, 60 + adjust);
+}
+//! [1]
+
+//! [2]
+QPainterPath Mouse::shape() const
+{
+    QPainterPath path;
+    path.addRect(-10, -20, 20, 40);
+    return path;
+}
+//! [2]
+
+//! [3]
+void Mouse::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
+{
+    // Body
+    painter->setBrush(color);
+    painter->drawEllipse(-10, -20, 20, 40);
+
+    // Eyes
+    painter->setBrush(Qt::white);
+    painter->drawEllipse(-10, -17, 8, 8);
+    painter->drawEllipse(2, -17, 8, 8);
+
+    // Nose
+    painter->setBrush(Qt::black);
+    painter->drawEllipse(QRectF(-2, -22, 4, 4));
+
+    // Pupils
+    painter->drawEllipse(QRectF(-8.0 + mouseEyeDirection, -17, 4, 4));
+    painter->drawEllipse(QRectF(4.0 + mouseEyeDirection, -17, 4, 4));
+
+    // Ears
+    painter->setBrush(scene()->collidingItems(this).isEmpty() ? Qt::darkYellow : Qt::red);
+    painter->drawEllipse(-17, -12, 16, 16);
+    painter->drawEllipse(1, -12, 16, 16);
+
+    // Tail
+    QPainterPath path(QPointF(0, 20));
+    path.cubicTo(-5, 22, -5, 22, 0, 25);
+    path.cubicTo(5, 27, 5, 32, 0, 30);
+    path.cubicTo(-5, 32, -5, 42, 0, 35);
+    painter->setBrush(Qt::NoBrush);
+    painter->drawPath(path);
+}
+//! [3]
+
+//! [4]
+void Mouse::timerEvent(QTimerEvent *)
+{
+//! [4]
+    // Don't move too far away
+//! [5]
+    QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0));
+    if (lineToCenter.length() > 150) {
+        qreal angleToCenter = std::atan2(lineToCenter.dy(), lineToCenter.dx());
+        angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2);
+
+        if (angleToCenter < Pi && angleToCenter > Pi / 4) {
+            // Rotate left
+            angle += (angle < -Pi / 2) ? 0.25 : -0.25;
+        } else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4)) {
+            // Rotate right
+            angle += (angle < Pi / 2) ? 0.25 : -0.25;
+        }
+    } else if (::sin(angle) < 0) {
+        angle += 0.25;
+    } else if (::sin(angle) > 0) {
+        angle -= 0.25;
+//! [5] //! [6]
+    }
+//! [6]
+
+    // Try not to crash with any other mice
+//! [7]
+    QList<QGraphicsItem *> dangerMice = scene()->items(QPolygonF()
+                                                       << mapToScene(0, 0)
+                                                       << mapToScene(-30, -50)
+                                                       << mapToScene(30, -50));
+    for (QGraphicsItem *item : dangerMice) {
+        if (item == this)
+            continue;
+
+        QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0));
+        qreal angleToMouse = std::atan2(lineToMouse.dy(), lineToMouse.dx());
+        angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2);
+
+        if (angleToMouse >= 0 && angleToMouse < Pi / 2) {
+            // Rotate right
+            angle += 0.5;
+        } else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2)) {
+            // Rotate left
+            angle -= 0.5;
+//! [7] //! [8]
+        }
+//! [8] //! [9]
+    }
+//! [9]
+
+    // Add some random movement
+//! [10]
+    if (dangerMice.size() > 1 && QRandomGenerator::global()->bounded(10) == 0) {
+        if (QRandomGenerator::global()->bounded(1))
+            angle += QRandomGenerator::global()->bounded(1 / 500.0);
+        else
+            angle -= QRandomGenerator::global()->bounded(1 / 500.0);
+    }
+//! [10]
+
+//! [11]
+    speed += (-50 + QRandomGenerator::global()->bounded(100)) / 100.0;
+
+    qreal dx = ::sin(angle) * 10;
+    mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5;
+
+    setTransform(QTransform().rotate(dx), true);
+    setPos(mapToParent(0, -(3 + sin(speed) * 3)));
+}
+//! [11]

tests/manual/examples/widgets/touch/pinchzoom/mouse.h

@@ -0,0 +1,33 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef MOUSE_H
+#define MOUSE_H
+
+#include <QGraphicsObject>
+
+//! [0]
+class Mouse : public QGraphicsObject
+{
+    Q_OBJECT
+
+public:
+    Mouse();
+
+    QRectF boundingRect() const override;
+    QPainterPath shape() const override;
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
+               QWidget *widget) override;
+
+protected:
+    void timerEvent(QTimerEvent *event) override;
+
+private:
+    qreal angle = 0;
+    qreal speed = 0;
+    qreal mouseEyeDirection = 0;
+    QColor color;
+};
+//! [0]
+
+#endif

tests/manual/examples/widgets/touch/pinchzoom/pinchzoom.pro

@@ -0,0 +1,16 @@
+QT += widgets
+
+HEADERS += \
+        mouse.h \
+        graphicsview.h
+SOURCES += \
+	main.cpp \
+        mouse.cpp \
+        graphicsview.cpp
+
+RESOURCES += \
+	mice.qrc
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/touch/pinchzoom
+INSTALLS += target