add tst_qquickwidget::synthMouseFromTouch test

Make sure events are delivered as expected and that synth-mouse
events have the right source().

Task-number: QTBUG-64241
Change-Id: I95a073ce0faea2111c8e1aca42fa44c1b529a6ec
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

tests/auto/quickwidgets/qquickwidget/tst_qquickwidget.cpp

@@ -27,6 +27,7 @@
 ****************************************************************************/
 
 #include <qtest.h>
+#include <qtesttouch.h>
 #include <QtTest/QSignalSpy>
 #include <QtQml/qqmlcomponent.h>
 #include <QtQml/qqmlcontext.h>
@@ -37,9 +38,77 @@
 #include <QtGui/QImage>
 #include <QtCore/QDebug>
 #include <QtQml/qqmlengine.h>
-
+#include <QtCore/QLoggingCategory>
 #include <QtQuickWidgets/QQuickWidget>
 
+Q_LOGGING_CATEGORY(lcTests, "qt.quick.tests")
+
+class MouseRecordingQQWidget : public QQuickWidget
+{
+public:
+    explicit MouseRecordingQQWidget(QWidget *parent = nullptr) : QQuickWidget(parent) {
+        setAttribute(Qt::WA_AcceptTouchEvents);
+    }
+
+protected:
+    void mousePressEvent(QMouseEvent *event) override {
+        qCDebug(lcTests) << event;
+        m_mouseEvents << *event;
+        QQuickWidget::mousePressEvent(event);
+    }
+    void mouseMoveEvent(QMouseEvent *event) override {
+        qCDebug(lcTests) << event;
+        m_mouseEvents << *event;
+        QQuickWidget::mouseMoveEvent(event);
+    }
+    void mouseReleaseEvent(QMouseEvent *event) override {
+        qCDebug(lcTests) << event;
+        m_mouseEvents << *event;
+        QQuickWidget::mouseReleaseEvent(event);
+    }
+
+public:
+    QList<QMouseEvent> m_mouseEvents;
+};
+
+class MouseRecordingItem : public QQuickItem
+{
+public:
+    MouseRecordingItem(bool acceptTouch, QQuickItem *parent = nullptr)
+        : QQuickItem(parent)
+        , m_acceptTouch(acceptTouch)
+    {
+        setSize(QSizeF(300, 300));
+        setAcceptedMouseButtons(Qt::LeftButton);
+    }
+
+protected:
+    void touchEvent(QTouchEvent* event) override {
+        event->setAccepted(m_acceptTouch);
+        m_touchEvents << *event;
+        qCDebug(lcTests) << "accepted?" << event->isAccepted() << event;
+    }
+    void mousePressEvent(QMouseEvent *event) override {
+        qCDebug(lcTests) << event;
+        m_mouseEvents << *event;
+    }
+    void mouseMoveEvent(QMouseEvent *event) override {
+        qCDebug(lcTests) << event;
+        m_mouseEvents << *event;
+    }
+    void mouseReleaseEvent(QMouseEvent *event) override {
+        qCDebug(lcTests) << event;
+        m_mouseEvents << *event;
+    }
+
+public:
+    QList<QMouseEvent> m_mouseEvents;
+    QList<QTouchEvent> m_touchEvents;
+
+private:
+    bool m_acceptTouch;
+};
+
 class tst_qquickwidget : public QQmlDataTest
 {
     Q_OBJECT
@@ -63,8 +132,12 @@ private slots:
     void shortcuts();
     void enterLeave();
     void mouseEventWindowPos();
-};
+    void synthMouseFromTouch_data();
+    void synthMouseFromTouch();
 
+private:
+    QTouchDevice *device = QTest::createTouchDevice();
+};
 
 tst_qquickwidget::tst_qquickwidget()
 {
@@ -462,6 +535,48 @@ void tst_qquickwidget::mouseEventWindowPos()
     QTRY_VERIFY(rootItem->property("wasMoved").toBool());
 }
 
+void tst_qquickwidget::synthMouseFromTouch_data()
+{
+    QTest::addColumn<bool>("synthMouse"); // AA_SynthesizeMouseForUnhandledTouchEvents
+    QTest::addColumn<bool>("acceptTouch"); // QQuickItem::touchEvent: setAccepted()
+
+    QTest::newRow("no synth, accept") << false << true; // suitable for touch-capable UIs
+    QTest::newRow("no synth, don't accept") << false << false;
+    QTest::newRow("synth and accept") << true << true;
+    QTest::newRow("synth, don't accept") << true << false; // the default
+}
+
+void tst_qquickwidget::synthMouseFromTouch()
+{
+    QFETCH(bool, synthMouse);
+    QFETCH(bool, acceptTouch);
+
+    QCoreApplication::setAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents, synthMouse);
+    QWidget window;
+    window.setAttribute(Qt::WA_AcceptTouchEvents);
+    QScopedPointer<MouseRecordingQQWidget> childView(new MouseRecordingQQWidget(&window));
+    MouseRecordingItem *item = new MouseRecordingItem(acceptTouch, nullptr);
+    childView->setContent(QUrl(), nullptr, item);
+    window.resize(300, 300);
+    childView->resize(300, 300);
+    window.show();
+    QVERIFY(QTest::qWaitForWindowActive(&window));
+    QVERIFY(childView->quickWindow()->isVisible());
+    QVERIFY(item->isVisible());
+
+    QPoint p1 = QPoint(20, 20);
+    QPoint p2 = QPoint(30, 30);
+    QTest::touchEvent(&window, device).press(0, p1, &window);
+    QTest::touchEvent(&window, device).move(0, p2, &window);
+    QTest::touchEvent(&window, device).release(0, p2, &window);
+
+    QCOMPARE(item->m_touchEvents.count(), 3);
+    QCOMPARE(item->m_mouseEvents.count(), acceptTouch ? 0 : 3);
+    QCOMPARE(childView->m_mouseEvents.count(), 0);
+    for (const QMouseEvent &ev : item->m_mouseEvents)
+        QCOMPARE(ev.source(), Qt::MouseEventSynthesizedByQt);
+}
+
 QTEST_MAIN(tst_qquickwidget)
 
 #include "tst_qquickwidget.moc"