qt 6.5.1 original

tests/manual/gestures/graphicsview/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## tst_manual_graphicsview Binary:
+#####################################################################
+
+qt_internal_add_manual_test(tst_manual_graphicsview
+    GUI
+    SOURCES
+        gestures.cpp gestures.h
+        imageitem.cpp imageitem.h
+        main.cpp
+        mousepangesturerecognizer.cpp mousepangesturerecognizer.h
+    LIBRARIES
+        Qt::Gui
+        Qt::Widgets
+)

tests/manual/gestures/graphicsview/gestures.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "gestures.h"
+
+#include <QTouchEvent>
+
+Qt::GestureType ThreeFingerSlideGesture::Type = Qt::CustomGesture;
+
+QGesture *ThreeFingerSlideGestureRecognizer::create(QObject *)
+{
+    return new ThreeFingerSlideGesture;
+}
+
+QGestureRecognizer::Result ThreeFingerSlideGestureRecognizer::recognize(QGesture *state, QObject *, QEvent *event)
+{
+    ThreeFingerSlideGesture *d = static_cast<ThreeFingerSlideGesture *>(state);
+    QGestureRecognizer::Result result;
+    switch (event->type()) {
+    case QEvent::TouchBegin:
+        result = QGestureRecognizer::MayBeGesture;
+        break;
+    case QEvent::TouchEnd:
+        if (d->gestureFired)
+            result = QGestureRecognizer::FinishGesture;
+        else
+            result = QGestureRecognizer::CancelGesture;
+        break;
+    case QEvent::TouchUpdate:
+        if (d->state() != Qt::NoGesture) {
+            QTouchEvent *ev = static_cast<QTouchEvent*>(event);
+            if (ev->points().size() == 3) {
+                d->gestureFired = true;
+                result = QGestureRecognizer::TriggerGesture;
+            } else {
+                result = QGestureRecognizer::MayBeGesture;
+                for (const QEventPoint &pt : ev->points()) {
+                    const int distance = (pt.globalPosition().toPoint() - pt.globalPressPosition().toPoint()).manhattanLength();
+                    if (distance > 20)
+                        result = QGestureRecognizer::CancelGesture;
+                }
+            }
+        } else {
+            result = QGestureRecognizer::CancelGesture;
+        }
+
+        break;
+    case QEvent::MouseButtonPress:
+    case QEvent::MouseButtonRelease:
+    case QEvent::MouseMove:
+        if (d->state() != Qt::NoGesture)
+            result = QGestureRecognizer::Ignore;
+        else
+            result = QGestureRecognizer::CancelGesture;
+        break;
+    default:
+        result = QGestureRecognizer::Ignore;
+        break;
+    }
+    return result;
+}
+
+void ThreeFingerSlideGestureRecognizer::reset(QGesture *state)
+{
+    static_cast<ThreeFingerSlideGesture *>(state)->gestureFired = false;
+    QGestureRecognizer::reset(state);
+}
+
+
+QGesture *RotateGestureRecognizer::create(QObject *)
+{
+    return new QGesture;
+}
+
+QGestureRecognizer::Result RotateGestureRecognizer::recognize(QGesture *, QObject *, QEvent *event)
+{
+    switch (event->type()) {
+    case QEvent::TouchBegin:
+    case QEvent::TouchEnd:
+    case QEvent::TouchUpdate:
+        break;
+    default:
+        break;
+    }
+    return QGestureRecognizer::Ignore;
+}
+
+void RotateGestureRecognizer::reset(QGesture *state)
+{
+    QGestureRecognizer::reset(state);
+}
+
+#include "moc_gestures.cpp"

tests/manual/gestures/graphicsview/gestures.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#ifndef GESTURE_H
+#define GESTURE_H
+
+#include <QGestureRecognizer>
+#include <QGesture>
+
+class ThreeFingerSlideGesture : public QGesture
+{
+    Q_OBJECT
+public:
+    static Qt::GestureType Type;
+
+    ThreeFingerSlideGesture(QObject *parent = nullptr) : QGesture(parent) { }
+
+    bool gestureFired;
+};
+
+class ThreeFingerSlideGestureRecognizer : public QGestureRecognizer
+{
+private:
+    QGesture *create(QObject *target);
+    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event);
+    void reset(QGesture *state);
+};
+
+class RotateGestureRecognizer : public QGestureRecognizer
+{
+public:
+    RotateGestureRecognizer();
+
+private:
+    QGesture *create(QObject *target);
+    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event);
+    void reset(QGesture *state);
+};
+
+#endif // GESTURE_H

tests/manual/gestures/graphicsview/graphicsview.pro

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+QT += widgets
+
+TARGET = tst_manual_graphicsview
+
+SOURCES += main.cpp \
+    imageitem.cpp \
+    gestures.cpp \
+    mousepangesturerecognizer.cpp
+
+HEADERS += imageitem.h \
+    gestures.h \
+    mousepangesturerecognizer.h

tests/manual/gestures/graphicsview/imageitem.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "imageitem.h"
+#include "gestures.h"
+
+#include <QPainter>
+#include <QEvent>
+
+ImageItem::ImageItem(const QImage &image)
+{
+    setImage(image);
+}
+
+void ImageItem::setImage(const QImage &image)
+{
+    image_ = image;
+    pixmap_ = QPixmap::fromImage(image.scaled(400, 400, Qt::KeepAspectRatio));
+    update();
+}
+
+QImage ImageItem::image() const
+{
+    return image_;
+}
+
+QRectF ImageItem::boundingRect() const
+{
+    const QSize size = pixmap_.size();
+    return QRectF(0, 0, size.width(), size.height());
+}
+
+void ImageItem::paint(QPainter *painter, const QStyleOptionGraphicsItem*, QWidget*)
+{
+    painter->drawPixmap(0, 0, pixmap_);
+}
+
+
+GestureImageItem::GestureImageItem(const QImage &image)
+    : ImageItem(image)
+{
+    grabGesture(Qt::PanGesture);
+    grabGesture(ThreeFingerSlideGesture::Type);
+}
+
+bool GestureImageItem::event(QEvent *event)
+{
+    if (event->type() == QEvent::Gesture) {
+        qDebug("gestureimageitem: gesture triggered");
+        return true;
+    }
+    return ImageItem::event(event);
+}
+
+#include "moc_imageitem.cpp"

tests/manual/gestures/graphicsview/imageitem.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#ifndef IMAGEITEM_H
+#define IMAGEITEM_H
+
+#include <QGraphicsItem>
+#include <QImage>
+#include <QPixmap>
+#include <QTransform>
+
+class ImageItem : public QGraphicsObject
+{
+    Q_OBJECT
+public:
+    ImageItem(const QImage &image);
+    void setImage(const QImage &image);
+    QImage image() const;
+    QRectF boundingRect() const;
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
+
+private:
+    QImage image_;
+    QPixmap pixmap_;
+    QTransform transform;
+};
+
+class GestureImageItem : public ImageItem
+{
+    Q_OBJECT
+
+public:
+    GestureImageItem(const QImage &image);
+
+protected:
+    bool event(QEvent *event);
+};
+
+#endif // IMAGEITEM_H

tests/manual/gestures/graphicsview/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QApplication>
+#include <QMainWindow>
+#include <QGraphicsScene>
+#include <QGraphicsView>
+#include <QScrollBar>
+#include <QImageReader>
+#include <QVBoxLayout>
+#include <QGestureEvent>
+#include <QDir>
+#include <QFileDialog>
+
+#include "imageitem.h"
+#include "gestures.h"
+#include "mousepangesturerecognizer.h"
+
+class GraphicsView : public QGraphicsView
+{
+public:
+    GraphicsView(QGraphicsScene *scene, QWidget *parent = nullptr)
+        : QGraphicsView(scene, parent)
+    {
+    }
+protected:
+    bool viewportEvent(QEvent *event)
+    {
+        if (event->type() == QEvent::Gesture) {
+            QGestureEvent *ge = static_cast<QGestureEvent *>(event);
+            if (QPanGesture *pan = static_cast<QPanGesture *>(ge->gesture(Qt::PanGesture))) {
+                switch (pan->state()) {
+                case Qt::GestureStarted: qDebug("view: Pan: started"); break;
+                case Qt::GestureFinished: qDebug("view: Pan: finished"); break;
+                case Qt::GestureCanceled: qDebug("view: Pan: canceled"); break;
+                case Qt::GestureUpdated: break;
+                default: qDebug("view: Pan: <unknown state>"); break;
+                }
+
+                const QPointF delta = pan->delta();
+                QScrollBar *vbar = verticalScrollBar();
+                QScrollBar *hbar = horizontalScrollBar();
+                vbar->setValue(vbar->value() - delta.y());
+                hbar->setValue(hbar->value() - delta.x());
+                ge->accept(pan);
+                return true;
+            }
+        }
+        return QGraphicsView::viewportEvent(event);
+    }
+};
+
+class StandardGestures : public QWidget
+{
+public:
+    StandardGestures(QWidget *parent = nullptr)
+            : QWidget(parent)
+    {
+        scene = new QGraphicsScene(this);
+        scene->setSceneRect(-2000, -2000, 4000, 4000);
+        view = new QGraphicsView(scene, 0);
+        QVBoxLayout *l = new QVBoxLayout(this);
+        l->addWidget(view);
+    }
+
+    QGraphicsScene *scene;
+    QGraphicsView *view;
+};
+
+class GlobalViewGestures : public QWidget
+{
+    Q_OBJECT
+public:
+    GlobalViewGestures(QWidget *parent = nullptr)
+            : QWidget(parent)
+    {
+        scene = new QGraphicsScene(this);
+        scene->setSceneRect(-2000, -2000, 4000, 4000);
+        view = new GraphicsView(scene, 0);
+        view->viewport()->grabGesture(Qt::PanGesture);
+        view->viewport()->grabGesture(ThreeFingerSlideGesture::Type);
+        QVBoxLayout *l = new QVBoxLayout(this);
+        l->addWidget(view);
+    }
+
+    QGraphicsScene *scene;
+    QGraphicsView *view;
+};
+
+class GraphicsItemGestures : public QWidget
+{
+    Q_OBJECT
+public:
+    GraphicsItemGestures(QWidget *parent = nullptr)
+            : QWidget(parent)
+    {
+        scene = new QGraphicsScene(this);
+        scene->setSceneRect(-2000, -2000, 4000, 4000);
+        view = new QGraphicsView(scene, 0);
+        view->viewport()->grabGesture(Qt::PanGesture);
+        view->viewport()->grabGesture(ThreeFingerSlideGesture::Type);
+        QVBoxLayout *l = new QVBoxLayout(this);
+        l->addWidget(view);
+    }
+
+    QGraphicsScene *scene;
+    QGraphicsView *view;
+};
+
+class MainWindow : public QMainWindow
+{
+public:
+    MainWindow();
+
+    void setDirectory(const QString &path);
+
+private:
+    QTabWidget *tabWidget;
+    StandardGestures *standardGestures;
+    GlobalViewGestures *globalViewGestures;
+    GraphicsItemGestures *graphicsItemGestures;
+};
+
+MainWindow::MainWindow()
+{
+    (void)QGestureRecognizer::registerRecognizer(new MousePanGestureRecognizer);
+    ThreeFingerSlideGesture::Type = QGestureRecognizer::registerRecognizer(new ThreeFingerSlideGestureRecognizer);
+
+    tabWidget = new QTabWidget;
+
+    standardGestures = new StandardGestures;
+    tabWidget->addTab(standardGestures, "Standard gestures");
+
+    globalViewGestures = new GlobalViewGestures;
+    tabWidget->addTab(globalViewGestures , "Global gestures");
+
+    graphicsItemGestures = new GraphicsItemGestures;
+    tabWidget->addTab(graphicsItemGestures, "Graphics item gestures");
+
+    setCentralWidget(tabWidget);
+}
+
+void MainWindow::setDirectory(const QString &path)
+{
+    QDir dir(path);
+    QStringList files = dir.entryList(QDir::Files | QDir::Readable | QDir::NoDotAndDotDot);
+    foreach(const QString &file, files) {
+        QImageReader img(path + QLatin1Char('/') +file);
+        QImage image = img.read();
+        if (!image.isNull()) {
+            {
+                ImageItem *item = new ImageItem(image);
+                item->setPos(0, 0);
+                item->setFlags(QGraphicsItem::ItemIsMovable);
+                standardGestures->scene->addItem(item);
+            }
+            {
+                ImageItem *item = new ImageItem(image);
+                item->setPos(0, 0);
+                item->setFlags(QGraphicsItem::ItemIsMovable);
+                globalViewGestures->scene->addItem(item);
+            }
+            {
+                GestureImageItem *item = new GestureImageItem(image);
+                item->setPos(0, 0);
+                item->setFlags(QGraphicsItem::ItemIsMovable);
+                graphicsItemGestures->scene->addItem(item);
+            }
+        }
+    }
+
+    {
+        QList<QGraphicsItem*> items = standardGestures->scene->items();
+        if (!items.isEmpty())
+            standardGestures->view->ensureVisible(items.at(0));
+    }
+    {
+        QList<QGraphicsItem*> items = globalViewGestures->scene->items();
+        if (!items.isEmpty())
+            globalViewGestures->view->ensureVisible(items.at(0));
+    }
+    {
+        QList<QGraphicsItem*> items = graphicsItemGestures->scene->items();
+        if (!items.isEmpty())
+            graphicsItemGestures->view->ensureVisible(items.at(0));
+    }
+}
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+    MainWindow window;
+    if (QApplication::arguments().size() > 1)
+        window.setDirectory(QApplication::arguments().at(1));
+    else
+        window.setDirectory(QFileDialog::getExistingDirectory(0, "Select image folder"));
+    window.show();
+    return app.exec();
+}
+
+#include "main.moc"

tests/manual/gestures/graphicsview/mousepangesturerecognizer.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "mousepangesturerecognizer.h"
+
+#include <QEvent>
+#include <QVariant>
+#include <QGraphicsSceneMouseEvent>
+#include <QMouseEvent>
+#include <QGesture>
+
+MousePanGestureRecognizer::MousePanGestureRecognizer()
+{
+}
+
+QGesture* MousePanGestureRecognizer::create(QObject *)
+{
+    return new QPanGesture;
+}
+
+QGestureRecognizer::Result MousePanGestureRecognizer::recognize(QGesture *state, QObject *, QEvent *event)
+{
+    QPanGesture *g = static_cast<QPanGesture *>(state);
+    QPoint globalPos;
+    switch (event->type()) {
+    case QEvent::GraphicsSceneMousePress:
+    case QEvent::GraphicsSceneMouseDoubleClick:
+    case QEvent::GraphicsSceneMouseMove:
+    case QEvent::GraphicsSceneMouseRelease:
+        globalPos = static_cast<QGraphicsSceneMouseEvent *>(event)->screenPos();
+        break;
+    case QEvent::MouseButtonPress:
+    case QEvent::MouseMove:
+    case QEvent::MouseButtonRelease:
+        globalPos = static_cast<QMouseEvent *>(event)->globalPosition().toPoint();
+        break;
+    default:
+        break;
+    }
+    if (event->type() == QEvent::MouseButtonPress || event->type() == QEvent::MouseButtonDblClick
+        || event->type() == QEvent::GraphicsSceneMousePress || event->type() == QEvent::GraphicsSceneMouseDoubleClick) {
+        g->setHotSpot(globalPos);
+        g->setProperty("startPos", globalPos);
+        g->setProperty("pressed", QVariant::fromValue<bool>(true));
+        return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;
+    } else if (event->type() == QEvent::MouseMove || event->type() == QEvent::GraphicsSceneMouseMove) {
+        if (g->property("pressed").toBool()) {
+            QPoint offset = globalPos - g->property("startPos").toPoint();
+            g->setLastOffset(g->offset());
+            g->setOffset(QPointF(offset.x(), offset.y()));
+            return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;
+        }
+        return QGestureRecognizer::CancelGesture;
+    } else if (event->type() == QEvent::MouseButtonRelease || event->type() == QEvent::GraphicsSceneMouseRelease) {
+        return QGestureRecognizer::FinishGesture | QGestureRecognizer::ConsumeEventHint;
+    }
+    return QGestureRecognizer::Ignore;
+}
+
+void MousePanGestureRecognizer::reset(QGesture *state)
+{
+    QPanGesture *g = static_cast<QPanGesture *>(state);
+    g->setLastOffset(QPointF());
+    g->setOffset(QPointF());
+    g->setAcceleration(0);
+    g->setProperty("startPos", QVariant());
+    g->setProperty("pressed", QVariant::fromValue<bool>(false));
+    QGestureRecognizer::reset(state);
+}

tests/manual/gestures/graphicsview/mousepangesturerecognizer.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#ifndef MOUSEPANGESTURERECOGNIZER_H
+#define MOUSEPANGESTURERECOGNIZER_H
+
+#include <QGestureRecognizer>
+
+class MousePanGestureRecognizer : public QGestureRecognizer
+{
+public:
+    MousePanGestureRecognizer();
+
+    QGesture* create(QObject *target);
+    QGestureRecognizer::Result recognize(QGesture *state, QObject *watched, QEvent *event);
+    void reset(QGesture *state);
+};
+
+#endif // MOUSEPANGESTURERECOGNIZER_H