qt 6.5.1 original

tests/manual/gestures/scrollarea/CMakeLists.txt

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

tests/manual/gestures/scrollarea/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 <QSlider>
+#include <QScrollArea>
+#include <QScrollBar>
+#include <QMainWindow>
+#include <QLabel>
+#include <QPushButton>
+#include <QVBoxLayout>
+#include <QGestureEvent>
+#include <QPanGesture>
+#include <QDebug>
+
+#include "mousepangesturerecognizer.h"
+
+class ScrollArea : public QScrollArea
+{
+    Q_OBJECT
+public:
+    ScrollArea(QWidget *parent = nullptr)
+        : QScrollArea(parent), outside(false)
+    {
+        viewport()->grabGesture(Qt::PanGesture, Qt::ReceivePartialGestures);
+    }
+
+protected:
+    bool viewportEvent(QEvent *event)
+    {
+        if (event->type() == QEvent::Gesture) {
+            gestureEvent(static_cast<QGestureEvent *>(event));
+            return true;
+        } else if (event->type() == QEvent::GestureOverride) {
+            QGestureEvent *ge = static_cast<QGestureEvent *>(event);
+            if (QPanGesture *pan = static_cast<QPanGesture *>(ge->gesture(Qt::PanGesture)))
+                if (pan->state() == Qt::GestureStarted) {
+                    outside = false;
+                }
+        }
+        return QScrollArea::viewportEvent(event);
+    }
+    void gestureEvent(QGestureEvent *event)
+    {
+        QPanGesture *pan = static_cast<QPanGesture *>(event->gesture(Qt::PanGesture));
+        if (pan) {
+            switch(pan->state()) {
+            case Qt::GestureStarted: qDebug() << this << "Pan: started"; break;
+            case Qt::GestureFinished: qDebug() << this << "Pan: finished"; break;
+            case Qt::GestureCanceled: qDebug() << this << "Pan: canceled"; break;
+            case Qt::GestureUpdated: break;
+            default: qDebug() << this << "Pan: <unknown state>"; break;
+            }
+
+            if (pan->state() == Qt::GestureStarted)
+                outside = false;
+            event->ignore();
+            event->ignore(pan);
+            if (outside)
+                return;
+
+            const QPointF delta = pan->delta();
+            const QPointF totalOffset = pan->offset();
+            QScrollBar *vbar = verticalScrollBar();
+            QScrollBar *hbar = horizontalScrollBar();
+
+            if ((vbar->value() == vbar->minimum() && totalOffset.y() > 10) ||
+                (vbar->value() == vbar->maximum() && totalOffset.y() < -10)) {
+                outside = true;
+                return;
+            }
+            if ((hbar->value() == hbar->minimum() && totalOffset.x() > 10) ||
+                (hbar->value() == hbar->maximum() && totalOffset.x() < -10)) {
+                outside = true;
+                return;
+            }
+            vbar->setValue(vbar->value() - delta.y());
+            hbar->setValue(hbar->value() - delta.x());
+            event->accept(pan);
+        }
+    }
+
+private:
+    bool outside;
+};
+
+class Slider : public QSlider
+{
+public:
+    Slider(Qt::Orientation orientation, QWidget *parent = nullptr)
+        : QSlider(orientation, parent)
+    {
+        grabGesture(Qt::PanGesture);
+    }
+protected:
+    bool event(QEvent *event)
+    {
+        if (event->type() == QEvent::Gesture) {
+            gestureEvent(static_cast<QGestureEvent *>(event));
+            return true;
+        }
+        return QSlider::event(event);
+    }
+    void gestureEvent(QGestureEvent *event)
+    {
+        QPanGesture *pan = static_cast<QPanGesture *>(event->gesture(Qt::PanGesture));
+        if (pan) {
+            switch (pan->state()) {
+            case Qt::GestureStarted: qDebug() << this << "Pan: started"; break;
+            case Qt::GestureFinished: qDebug() << this << "Pan: finished"; break;
+            case Qt::GestureCanceled: qDebug() << this << "Pan: canceled"; break;
+            case Qt::GestureUpdated: break;
+            default: qDebug() << this << "Pan: <unknown state>"; break;
+            }
+
+            if (pan->state() == Qt::GestureStarted)
+                outside = false;
+            event->ignore();
+            event->ignore(pan);
+            if (outside)
+                return;
+            const QPointF delta = pan->delta();
+            const QPointF totalOffset = pan->offset();
+            if (orientation() == Qt::Horizontal) {
+                if ((value() == minimum() && totalOffset.x() < -10) ||
+                    (value() == maximum() && totalOffset.x() > 10)) {
+                    outside = true;
+                    return;
+                }
+                if (totalOffset.y() < 40 && totalOffset.y() > -40) {
+                    setValue(value() + delta.x());
+                    event->accept(pan);
+                } else {
+                    outside = true;
+                }
+            } else if (orientation() == Qt::Vertical) {
+                if ((value() == maximum() && totalOffset.y() < -10) ||
+                    (value() == minimum() && totalOffset.y() > 10)) {
+                    outside = true;
+                    return;
+                }
+                if (totalOffset.x() < 40 && totalOffset.x() > -40) {
+                    setValue(value() - delta.y());
+                    event->accept(pan);
+                } else {
+                    outside = true;
+                }
+            }
+        }
+    }
+private:
+    bool outside;
+};
+
+class MainWindow : public QMainWindow
+{
+public:
+    MainWindow()
+    {
+        rootScrollArea = new ScrollArea;
+        rootScrollArea->setObjectName(QLatin1String("rootScrollArea"));
+        setCentralWidget(rootScrollArea);
+
+        QWidget *root = new QWidget;
+        root->setFixedSize(3000, 3000);
+        rootScrollArea->setWidget(root);
+
+        Slider *verticalSlider = new Slider(Qt::Vertical, root);
+        verticalSlider->setObjectName(QLatin1String("verticalSlider"));
+        verticalSlider ->move(650, 1100);
+        Slider *horizontalSlider = new Slider(Qt::Horizontal, root);
+        horizontalSlider->setObjectName(QLatin1String("horizontalSlider"));
+        horizontalSlider ->move(600, 1000);
+
+        childScrollArea = new ScrollArea(root);
+        childScrollArea->setObjectName(QLatin1String("childScrollArea"));
+        childScrollArea->move(500, 500);
+        QWidget *w = new QWidget;
+        w->setMinimumWidth(700);
+        QVBoxLayout *l = new QVBoxLayout(w);
+        l->setContentsMargins(20, 20, 20, 20);
+        for (int i = 0; i < 100; ++i) {
+            QWidget *w = new QWidget;
+            QHBoxLayout *ll = new QHBoxLayout(w);
+            ll->addWidget(new QLabel(QString("Label %1").arg(i)));
+            ll->addWidget(new QPushButton(QString("Button %1").arg(i)));
+            l->addWidget(w);
+        }
+        childScrollArea->setWidget(w);
+#if defined(Q_OS_WIN)
+        // Windows can force Qt to create a native window handle for an
+        // intermediate widget and that will block gesture to get touch events.
+        // So this hack to make sure gestures get all touch events they need.
+        foreach (QObject *w, children())
+            if (w->isWidgetType())
+                static_cast<QWidget *>(w)->setAttribute(Qt::WA_AcceptTouchEvents);
+#endif
+    }
+private:
+    ScrollArea *rootScrollArea;
+    ScrollArea *childScrollArea;
+};
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+    QGestureRecognizer::registerRecognizer(new MousePanGestureRecognizer);
+    MainWindow w;
+    w.show();
+    return app.exec();
+}
+
+#include "main.moc"

tests/manual/gestures/scrollarea/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 <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);
+    if (event->type() == QEvent::TouchBegin) {
+        // ignore the following mousepress event
+        g->setProperty("ignoreMousePress", QVariant::fromValue<bool>(true));
+    } else if (event->type() == QEvent::TouchEnd) {
+        g->setProperty("ignoreMousePress", QVariant::fromValue<bool>(false));
+    }
+    QMouseEvent *me = static_cast<QMouseEvent *>(event);
+    if (event->type() == QEvent::MouseButtonPress) {
+        if (g->property("ignoreMousePress").toBool())
+            return QGestureRecognizer::Ignore;
+        g->setHotSpot(me->globalPos());
+        g->setProperty("startPos", me->globalPos());
+        g->setProperty("pressed", QVariant::fromValue<bool>(true));
+        return QGestureRecognizer::TriggerGesture | QGestureRecognizer::ConsumeEventHint;
+    } else if (event->type() == QEvent::MouseMove) {
+        if (g->property("pressed").toBool()) {
+            QPoint offset = me->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) {
+        if (g->property("pressed").toBool())
+            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));
+    g->setProperty("ignoreMousePress", QVariant::fromValue<bool>(false));
+    QGestureRecognizer::reset(state);
+}

tests/manual/gestures/scrollarea/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

tests/manual/gestures/scrollarea/scrollarea.pro

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+QT += widgets
+
+SOURCES = main.cpp \
+    mousepangesturerecognizer.cpp
+HEADERS += mousepangesturerecognizer.h