Add tst_qquickflickable::parallelTouch

Prove that we can drag multiple Flickables with multiple touchpoints now.

[ChangeLog][QtQuick][Flickable] Flickable now handles touch events directly:
you can now drag multiple Flickables with multiple touchpoints.

Fixes: QTBUG-30840
Change-Id: I0a3e58595a67f5afb4b93ad64d5280cb3fc52f7a
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

2 files changed, 110 insertions, 0 deletions

diff --git a/tests/auto/quick/qquickflickable/data/parallel.qml b/tests/auto/quick/qquickflickable/data/parallel.qml
new file mode 100644
index 0000000000..4259173e9f
--- /dev/null
+++ b/tests/auto/quick/qquickflickable/data/parallel.qml
@@ -0,0 +1,67 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+
+Row {
+    id: root
+    width: 320
+    height: 480
+    Flickable {
+        id: fl1
+        objectName: "fl1"
+        width: parent.width / 2
+        height: parent.height
+        contentHeight: 640
+        Rectangle {
+            width: fl1.width
+            height: 640
+            color: fl1.dragging ? "steelblue" : "lightsteelblue"
+            Text {
+                anchors.centerIn: parent
+                text: "flick this"
+            }
+        }
+    }
+    Flickable {
+        id: fl2
+        objectName: "fl2"
+        width: parent.width / 2
+        height: parent.height
+        contentHeight: 640
+        Rectangle {
+            width: fl2.width
+            height: 640
+            color: fl2.dragging ? "bisque" : "beige"
+            Text {
+                anchors.centerIn: parent
+                text: "and flick\nthis too"
+            }
+        }
+    }
+}
diff --git a/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp b/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp
index eb6ad494b4..310ab17db4 100644
--- a/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp
+++ b/tests/auto/quick/qquickflickable/tst_qquickflickable.cpp
@@ -44,6 +44,8 @@
 
 #include <qpa/qwindowsysteminterface.h>
 
+Q_LOGGING_CATEGORY(lcTests, "qt.quick.tests")
+
 using namespace QQuickViewTestUtil;
 using namespace QQuickVisualTestUtil;
 
@@ -201,6 +203,7 @@ private slots:
     void synchronousDrag_data();
     void synchronousDrag();
     void visibleAreaBinding();
+    void parallelTouch();
 
 private:
     void flickWithTouch(QQuickWindow *window, const QPoint &from, const QPoint &to);
@@ -2545,6 +2548,46 @@ void tst_qquickflickable::visibleAreaBinding()
     // Shouldn't crash.
 }
 
+void tst_qquickflickable::parallelTouch() // QTBUG-30840
+{
+    const int threshold = qApp->styleHints()->startDragDistance();
+    QQuickView view;
+    view.setSource(testFileUrl("parallel.qml"));
+    view.show();
+    view.requestActivate();
+    QVERIFY(QTest::qWaitForWindowActive(&view));
+    QVERIFY(view.rootObject());
+    QQuickFlickable *flickable1 = view.rootObject()->findChild<QQuickFlickable*>("fl1");
+    QVERIFY(flickable1);
+    QQuickFlickable *flickable2 = view.rootObject()->findChild<QQuickFlickable*>("fl2");
+    QVERIFY(flickable2);
+
+    // Drag both in parallel via touch, opposite directions
+    QPoint p0(80, 240);
+    QPoint p1(240, 240);
+    QTest::touchEvent(&view, touchDevice).press(0, p0, &view).press(1, p1, &view);
+    int began1After = -1;
+    int began2After = -1;
+    for (int i = 0; i < 8; ++i) {
+        p0 += QPoint(0, threshold);
+        p1 -= QPoint(0, threshold);
+        QTest::touchEvent(&view, touchDevice).move(0, p0, &view).move(1, p1, &view);
+        QQuickTouchUtils::flush(&view);
+        if (began1After < 0 && flickable1->isDragging())
+            began1After = i;
+        if (began2After < 0 && flickable2->isDragging())
+            began2After = i;
+    }
+    qCDebug(lcTests, "flickables began dragging after %d and %d events respectively", began1After, began2After);
+    QVERIFY(flickable1->isDraggingVertically());
+    QVERIFY(flickable2->isDraggingVertically());
+    QCOMPARE(began1After, 2);
+    QCOMPARE(began2After, 2);
+    QTest::touchEvent(&view, touchDevice).release(0, p0, &view).release(1, p1, &view);
+    QTRY_VERIFY(!flickable1->isMoving());
+    QTRY_VERIFY(!flickable2->isMoving());
+}
+
 QTEST_MAIN(tst_qquickflickable)
 
 #include "tst_qquickflickable.moc"