Fix drawer visibility and overlay event handling

Drawers were visible all the time, lurking at the window edges to be
able to catch presses and drag themselves visible when appropriate.

This change moves the handling of window edge presses from QQuickDrawer
to QQuickOverlay, making it possible to show and hide drawers like any
other popups. Instead of having all drawers visible all the time, we
just keep QQuickOverlay visible when there are any registered drawers,
even hidden ones.

Furthermore, this change makes modal popup/drawer background dimming
items accept mouse press events just like they accept hover events to
ensure that a modal overlay does not leak input events through. When
the background dimming of a modal drawer has been dragged over the
drag-threshold, the drawer simply steals/grabs mouse to start dragging
of the drawer.

Task-number: QTBUG-54794
Task-number: QTBUG-54800
Task-number: QTBUG-55022
Task-number: QTBUG-55703
Task-number: QTBUG-55713
Change-Id: I65fb38fcf1466d4e41192c4321d80fb90b49da9a
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

4 files changed, 347 insertions, 47 deletions

diff --git a/tests/auto/controls/data/tst_popup.qml b/tests/auto/controls/data/tst_popup.qml
index 2c6d60da..e714a7d0 100644
--- a/tests/auto/controls/data/tst_popup.qml
+++ b/tests/auto/controls/data/tst_popup.qml
@@ -971,18 +971,13 @@ TestCase {
         ApplicationWindow {
             property alias firstDrawer: firstDrawer
             property alias secondDrawer: secondDrawer
-            property alias upperDrawer: upperDrawer
             property alias modalPopup: modalPopup
             property alias modelessPopup: modelessPopup
             property alias plainPopup: plainPopup
             property alias modalPopupWithoutDim: modalPopupWithoutDim
             visible: true
             Drawer {
-                z: 5
-                id: upperDrawer
-            }
-            Drawer {
-                z: 1
+                z: 0
                 id: firstDrawer
             }
             Drawer {
@@ -1038,52 +1033,41 @@ TestCase {
         window.requestActivate()
         tryCompare(window, "active", true)
 
-        var countBefore = window.overlay.children.length
-        compare(countBefore, 6) // 3 drawers + 3 overlays
+        compare(window.overlay.children.length, 0)
 
         var firstOverlay = findOverlay(window, window.firstDrawer)
+        verify(!firstOverlay)
+        window.firstDrawer.open()
+        compare(window.overlay.children.length, 2) // 1 drawer + 1 overlay
+        firstOverlay = findOverlay(window, window.firstDrawer)
         verify(firstOverlay)
-        compare(firstOverlay.opacity, 0.0)
         compare(firstOverlay.z, window.firstDrawer.z)
         compare(indexOf(window.overlay.children, firstOverlay),
                 indexOf(window.overlay.children, window.firstDrawer.contentItem.parent) - 1)
+        tryCompare(firstOverlay, "opacity", 1.0)
 
         var secondOverlay = findOverlay(window, window.secondDrawer)
+        verify(!secondOverlay)
+        window.secondDrawer.open()
+        compare(window.overlay.children.length, 4) // 2 drawers + 2 overlays
+        secondOverlay = findOverlay(window, window.secondDrawer)
         verify(secondOverlay)
-        compare(secondOverlay.opacity, 0.0)
         compare(secondOverlay.z, window.secondDrawer.z)
         compare(indexOf(window.overlay.children, secondOverlay),
                 indexOf(window.overlay.children, window.secondDrawer.contentItem.parent) - 1)
+        tryCompare(secondOverlay, "opacity", 1.0)
 
-        var upperOverlay = findOverlay(window, window.upperDrawer)
-        verify(upperOverlay)
-        compare(upperOverlay.opacity, 0.0)
-        compare(upperOverlay.z, window.upperDrawer.z)
-        compare(indexOf(window.overlay.children, upperOverlay),
-                indexOf(window.overlay.children, window.upperDrawer.contentItem.parent) - 1)
-
-        window.firstDrawer.open()
-        compare(firstOverlay.z, 1.0)
-        tryCompare(firstOverlay, "opacity", 1.0)
         window.firstDrawer.close()
-        tryCompare(firstOverlay, "opacity", 0.0)
         tryCompare(window.firstDrawer, "visible", false)
+        firstOverlay = findOverlay(window, window.firstDrawer)
+        verify(!firstOverlay)
+        compare(window.overlay.children.length, 2) // 1 drawer + 1 overlay
 
-        window.secondDrawer.open()
-        compare(secondOverlay.z, 1.0)
-        tryCompare(secondOverlay, "opacity", 1.0)
         window.secondDrawer.close()
-        tryCompare(secondOverlay, "opacity", 0.0)
         tryCompare(window.secondDrawer, "visible", false)
-
-        window.firstDrawer.open()
-        window.secondDrawer.open()
-        tryCompare(firstOverlay, "opacity", 1.0)
-        tryCompare(secondOverlay, "opacity", 1.0)
-        window.firstDrawer.close()
-        window.secondDrawer.close()
-        tryCompare(firstOverlay, "opacity", 0.0)
-        tryCompare(secondOverlay, "opacity", 0.0)
+        secondOverlay = findOverlay(window, window.secondDrawer)
+        verify(!secondOverlay)
+        compare(window.overlay.children.length, 0)
 
         var modalOverlay = findOverlay(window, window.modalPopup)
         verify(!modalOverlay)
@@ -1093,7 +1077,7 @@ TestCase {
         compare(modalOverlay.z, window.modalPopup.z)
         compare(window.modalPopup.visible, true)
         tryCompare(modalOverlay, "opacity", 1.0)
-        compare(window.overlay.children.length, countBefore + 2) // 1 popup + 1 overlay
+        compare(window.overlay.children.length, 2) // 1 popup + 1 overlay
 
         var modelessOverlay = findOverlay(window, window.modelessPopup)
         verify(!modelessOverlay)
@@ -1103,13 +1087,13 @@ TestCase {
         compare(modelessOverlay.z, window.modelessPopup.z)
         compare(window.modelessPopup.visible, true)
         tryCompare(modelessOverlay, "opacity", 1.0)
-        compare(window.overlay.children.length, countBefore + 4) // 2 popups + 2 overlays
+        compare(window.overlay.children.length, 4) // 2 popups + 2 overlays
 
         window.modelessPopup.close()
         tryCompare(window.modelessPopup, "visible", false)
         modelessOverlay = findOverlay(window, window.modelessPopup)
         verify(!modelessOverlay)
-        compare(window.overlay.children.length, countBefore + 2) // 1 popup + 1 overlay
+        compare(window.overlay.children.length, 2) // 1 popup + 1 overlay
 
         compare(window.modalPopup.visible, true)
         compare(modalOverlay.opacity, 1.0)
@@ -1118,29 +1102,29 @@ TestCase {
         tryCompare(window.modalPopup, "visible", false)
         modalOverlay = findOverlay(window, window.modalPopup)
         verify(!modalOverlay)
-        compare(window.overlay.children.length, countBefore)
+        compare(window.overlay.children.length, 0)
 
         window.plainPopup.open()
         tryCompare(window.plainPopup, "visible", true)
-        compare(window.overlay.children.length, countBefore + 1) // only popup added, no overlays involved
+        compare(window.overlay.children.length, 1) // only popup added, no overlays involved
 
         window.plainPopup.modal = true
-        compare(window.overlay.children.length, countBefore + 2) // overlay added
+        compare(window.overlay.children.length, 2) // overlay added
 
         window.plainPopup.close()
         tryCompare(window.plainPopup, "visible", false)
-        compare(window.overlay.children.length, countBefore) // popup + overlay removed
+        compare(window.overlay.children.length, 0) // popup + overlay removed
 
         window.modalPopupWithoutDim.open()
         tryCompare(window.modalPopupWithoutDim, "visible", true)
-        compare(window.overlay.children.length, countBefore + 1) // only popup added, no overlays involved
+        compare(window.overlay.children.length, 1) // only popup added, no overlays involved
 
         window.modalPopupWithoutDim.dim = true
-        compare(window.overlay.children.length, countBefore + 2) // overlay added
+        compare(window.overlay.children.length, 2) // overlay added
 
         window.modalPopupWithoutDim.close()
         tryCompare(window.modalPopupWithoutDim, "visible", false)
-        compare(window.overlay.children.length, countBefore) // popup + overlay removed
+        compare(window.overlay.children.length, 0) // popup + overlay removed
 
         window.destroy()
     }
diff --git a/tests/auto/drawer/data/multiple.qml b/tests/auto/drawer/data/multiple.qml
new file mode 100644
index 00000000..b2ef9781
--- /dev/null
+++ b/tests/auto/drawer/data/multiple.qml
@@ -0,0 +1,85 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.6
+import QtQuick.Controls 2.0
+
+ApplicationWindow {
+    width: 400
+    height: 400
+
+    property alias leftDrawer: leftDrawer
+    property alias leftButton: leftButton
+
+    property alias rightDrawer: rightDrawer
+    property alias rightButton: rightButton
+
+    property alias contentButton: contentButton
+
+    Drawer {
+        id: leftDrawer
+        width: 300
+        height: 400
+        z: 1
+
+        contentItem: Button {
+            id: leftButton
+            text: "Left"
+        }
+    }
+
+    Button {
+        id: contentButton
+        text: "Content"
+        anchors.fill: parent
+    }
+
+    Drawer {
+        id: rightDrawer
+        width: 300
+        height: 400
+        edge: Qt.RightEdge
+
+        contentItem: Button {
+            id: rightButton
+            text: "Right"
+        }
+    }
+}
diff --git a/tests/auto/drawer/data/window.qml b/tests/auto/drawer/data/window.qml
new file mode 100644
index 00000000..47ef5cb0
--- /dev/null
+++ b/tests/auto/drawer/data/window.qml
@@ -0,0 +1,56 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.6
+import QtQuick.Window 2.2
+import QtQuick.Controls 2.0
+
+Window {
+    width: 400
+    height: 400
+
+    property alias drawer: drawer
+
+    Drawer {
+        id: drawer
+        width: 200
+        height: 200
+    }
+}
diff --git a/tests/auto/drawer/tst_drawer.cpp b/tests/auto/drawer/tst_drawer.cpp
index 43236817..02a4f91f 100644
--- a/tests/auto/drawer/tst_drawer.cpp
+++ b/tests/auto/drawer/tst_drawer.cpp
@@ -42,6 +42,7 @@
 #include <QtGui/qstylehints.h>
 #include <QtGui/qguiapplication.h>
 #include <QtQuickTemplates2/private/qquickapplicationwindow_p.h>
+#include <QtQuickTemplates2/private/qquickoverlay_p.h>
 #include <QtQuickTemplates2/private/qquickdrawer_p.h>
 #include <QtQuickTemplates2/private/qquickbutton_p.h>
 
@@ -52,6 +53,9 @@ class tst_Drawer : public QQmlDataTest
     Q_OBJECT
 
 private slots:
+    void visible_data();
+    void visible();
+
     void position_data();
     void position();
 
@@ -62,8 +66,58 @@ private slots:
 
     void hover_data();
     void hover();
+
+    void multiple();
 };
 
+void tst_Drawer::visible_data()
+{
+    QTest::addColumn<QString>("source");
+    QTest::newRow("Window") << "window.qml";
+    QTest::newRow("ApplicationWindow") << "applicationwindow.qml";
+}
+
+void tst_Drawer::visible()
+{
+    QFETCH(QString, source);
+    QQuickApplicationHelper helper(this, source);
+
+    QQuickWindow *window = helper.window;
+    window->show();
+    QVERIFY(QTest::qWaitForWindowExposed(window));
+
+    QQuickDrawer *drawer = window->property("drawer").value<QQuickDrawer*>();
+    QVERIFY(drawer);
+    QQuickItem *popupItem = drawer->popupItem();
+
+    QCOMPARE(drawer->isVisible(), false);
+    QCOMPARE(drawer->position(), qreal(0.0));
+
+    QQuickOverlay *overlay = QQuickOverlay::overlay(window);
+    QVERIFY(overlay);
+    QVERIFY(!overlay->childItems().contains(popupItem));
+
+    drawer->open();
+    QVERIFY(drawer->isVisible());
+    QVERIFY(overlay->childItems().contains(popupItem));
+    QTRY_COMPARE(drawer->position(), qreal(1.0));
+
+    drawer->close();
+    QTRY_VERIFY(!drawer->isVisible());
+    QTRY_COMPARE(drawer->position(), qreal(0.0));
+    QVERIFY(!overlay->childItems().contains(popupItem));
+
+    drawer->setVisible(true);
+    QVERIFY(drawer->isVisible());
+    QVERIFY(overlay->childItems().contains(popupItem));
+    QTRY_COMPARE(drawer->position(), qreal(1.0));
+
+    drawer->setVisible(false);
+    QTRY_VERIFY(!drawer->isVisible());
+    QTRY_COMPARE(drawer->position(), qreal(0.0));
+    QTRY_VERIFY(!overlay->childItems().contains(popupItem));
+}
+
 void tst_Drawer::position_data()
 {
     QTest::addColumn<Qt::Edge>("edge");
@@ -179,10 +233,10 @@ void tst_Drawer::reposition()
     drawer->open();
     QTRY_COMPARE(drawer->popupItem()->x(), window->width() - drawer->width());
 
-    drawer->close();
-    QTRY_COMPARE(drawer->popupItem()->x(), static_cast<qreal>(window->width()));
-
     window->setWidth(window->width() + 100);
+    QTRY_COMPARE(drawer->popupItem()->x(), window->width() - drawer->width());
+
+    drawer->close();
     QTRY_COMPARE(drawer->popupItem()->x(), static_cast<qreal>(window->width()));
 }
 
@@ -250,6 +304,127 @@ void tst_Drawer::hover()
     QVERIFY(backgroundButton->isHovered());
 }
 
+void tst_Drawer::multiple()
+{
+    QQuickApplicationHelper helper(this, QStringLiteral("multiple.qml"));
+    QQuickWindow *window = helper.window;
+    window->show();
+    QVERIFY(QTest::qWaitForWindowExposed(window));
+
+    QQuickDrawer *leftDrawer = window->property("leftDrawer").value<QQuickDrawer*>();
+    QVERIFY(leftDrawer);
+    QQuickButton *leftButton = window->property("leftButton").value<QQuickButton*>();
+    QVERIFY(leftButton);
+    QSignalSpy leftClickSpy(leftButton, SIGNAL(clicked()));
+    QVERIFY(leftClickSpy.isValid());
+
+    QQuickDrawer *rightDrawer = window->property("rightDrawer").value<QQuickDrawer*>();
+    QVERIFY(rightDrawer);
+    QQuickButton *rightButton = window->property("rightButton").value<QQuickButton*>();
+    QVERIFY(rightButton);
+    QSignalSpy rightClickSpy(rightButton, SIGNAL(clicked()));
+    QVERIFY(rightClickSpy.isValid());
+
+    QQuickButton *contentButton = window->property("contentButton").value<QQuickButton*>();
+    QVERIFY(contentButton);
+    QSignalSpy contentClickSpy(contentButton, SIGNAL(clicked()));
+    QVERIFY(contentClickSpy.isValid());
+
+    // no drawers open, click the content
+    QTest::mouseClick(window, Qt::LeftButton);
+    QCOMPARE(contentClickSpy.count(), 1);
+    QCOMPARE(leftClickSpy.count(), 0);
+    QCOMPARE(rightClickSpy.count(), 0);
+
+    // drag the left drawer open
+    QTest::mousePress(window, Qt::LeftButton, Qt::NoModifier, QPoint(0, window->height() / 2));
+    QTest::mouseMove(window, QPoint(leftDrawer->width() / 2, window->height() / 2));
+    QCOMPARE(leftDrawer->position(), 0.5);
+    QCOMPARE(rightDrawer->position(), 0.0);
+    QTest::mouseRelease(window, Qt::LeftButton, Qt::NoModifier, QPoint(leftDrawer->width() / 2, window->height() / 2));
+    QTRY_COMPARE(leftDrawer->position(), 1.0);
+    QCOMPARE(rightDrawer->position(), 0.0);
+
+    // cannot drag the right drawer while the left drawer is open
+    QTest::mousePress(window, Qt::LeftButton, Qt::NoModifier, QPoint(window->width() - 1, window->height() / 2));
+    QTest::mouseMove(window, QPoint(window->width() - leftDrawer->width() / 2, window->height() / 2));
+    QCOMPARE(leftDrawer->position(), 1.0);
+    QCOMPARE(rightDrawer->position(), 0.0);
+    QTest::mouseRelease(window, Qt::LeftButton, Qt::NoModifier, QPoint(window->width() - leftDrawer->width() / 2, window->height() / 2));
+    QCOMPARE(rightDrawer->position(), 0.0);
+    QCOMPARE(leftDrawer->position(), 1.0);
+
+    // open the right drawer below the left drawer
+    rightDrawer->open();
+    QTRY_COMPARE(rightDrawer->position(), 1.0);
+
+    // click the left drawer's button
+    QTest::mouseClick(window, Qt::LeftButton);
+    QCOMPARE(contentClickSpy.count(), 1);
+    QCOMPARE(leftClickSpy.count(), 1);
+    QCOMPARE(rightClickSpy.count(), 0);
+
+    // click the left drawer's background (button disabled, don't leak through to the right drawer below)
+    leftButton->setEnabled(false);
+    QTest::mouseClick(window, Qt::LeftButton);
+    QCOMPARE(contentClickSpy.count(), 1);
+    QCOMPARE(leftClickSpy.count(), 1);
+    QCOMPARE(rightClickSpy.count(), 0);
+    leftButton->setEnabled(true);
+
+    // click the overlay of the left drawer (don't leak through to right drawer below)
+    QTest::mouseClick(window, Qt::LeftButton, Qt::NoModifier, QPoint(window->width() - (window->width() - leftDrawer->width()) / 2, window->height() / 2));
+    QCOMPARE(contentClickSpy.count(), 1);
+    QCOMPARE(leftClickSpy.count(), 1);
+    QCOMPARE(rightClickSpy.count(), 0);
+    QTRY_VERIFY(!leftDrawer->isVisible());
+
+    // click the right drawer's button
+    QTest::mouseClick(window, Qt::LeftButton);
+    QCOMPARE(contentClickSpy.count(), 1);
+    QCOMPARE(leftClickSpy.count(), 1);
+    QCOMPARE(rightClickSpy.count(), 1);
+
+    // cannot drag the left drawer while the right drawer is open
+    QTest::mousePress(window, Qt::LeftButton, Qt::NoModifier, QPoint(0, window->height() / 2));
+    QTest::mouseMove(window, QPoint(leftDrawer->width() / 2, window->height() / 2));
+    QCOMPARE(leftDrawer->position(), 0.0);
+    QCOMPARE(rightDrawer->position(), 1.0);
+    QTest::mouseRelease(window, Qt::LeftButton, Qt::NoModifier, QPoint(leftDrawer->width() / 2, window->height() / 2));
+    QCOMPARE(leftDrawer->position(), 0.0);
+    QCOMPARE(rightDrawer->position(), 1.0);
+
+    // click the right drawer's background (button disabled, don't leak through to the content below)
+    rightButton->setEnabled(false);
+    QTest::mouseClick(window, Qt::LeftButton);
+    QCOMPARE(contentClickSpy.count(), 1);
+    QCOMPARE(leftClickSpy.count(), 1);
+    QCOMPARE(rightClickSpy.count(), 1);
+    rightButton->setEnabled(true);
+
+    // click the overlay of the right drawer (don't leak through to the content below)
+    QTest::mouseClick(window, Qt::LeftButton, Qt::NoModifier, QPoint((window->width() - rightDrawer->width()) / 2, window->height() / 2));
+    QCOMPARE(contentClickSpy.count(), 1);
+    QCOMPARE(leftClickSpy.count(), 1);
+    QCOMPARE(rightClickSpy.count(), 1);
+    QTRY_VERIFY(!rightDrawer->isVisible());
+
+    // no drawers open, click the content
+    QTest::mouseClick(window, Qt::LeftButton);
+    QCOMPARE(contentClickSpy.count(), 2);
+    QCOMPARE(leftClickSpy.count(), 1);
+    QCOMPARE(rightClickSpy.count(), 1);
+
+    // drag the right drawer open
+    QTest::mousePress(window, Qt::LeftButton, Qt::NoModifier, QPoint(window->width() - 1, window->height() / 2));
+    QTest::mouseMove(window, QPoint(window->width() - rightDrawer->width() / 2, window->height() / 2));
+    QCOMPARE(rightDrawer->position(), 0.5);
+    QCOMPARE(leftDrawer->position(), 0.0);
+    QTest::mouseRelease(window, Qt::LeftButton, Qt::NoModifier, QPoint(window->width() - rightDrawer->width() / 2, window->height() / 2));
+    QTRY_COMPARE(rightDrawer->position(), 1.0);
+    QCOMPARE(leftDrawer->position(), 0.0);
+}
+
 QTEST_MAIN(tst_Drawer)
 
 #include "tst_drawer.moc"