Dialog: Update the title on the window when changing it on the dialog

Change-Id: Id9c60bf10bc0d4fb28ee9a027b84e395e9cb745c
Fixes: QTBUG-74350
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

3 files changed, 80 insertions, 0 deletions

diff --git a/src/dialogs/qquickdialog.cpp b/src/dialogs/qquickdialog.cpp
index ef6a9a1f..4ccc0f9d 100644
--- a/src/dialogs/qquickdialog.cpp
+++ b/src/dialogs/qquickdialog.cpp
@@ -322,6 +322,8 @@ void QQuickDialog1::setTitle(const QString &arg)
 {
     if (m_title != arg) {
         m_title = arg;
+        if (m_dialogWindow)
+            m_dialogWindow->setTitle(m_title);
         emit titleChanged();
     }
 }
diff --git a/tests/auto/dialogs/data/DialogWithDynamicTitle.qml b/tests/auto/dialogs/data/DialogWithDynamicTitle.qml
new file mode 100644
index 00000000..806b6977
--- /dev/null
+++ b/tests/auto/dialogs/data/DialogWithDynamicTitle.qml
@@ -0,0 +1,62 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, 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 2.12
+import QtQuick.Controls 1.4
+import QtQuick.Dialogs 1.2
+
+Dialog {
+    visible: true
+    property bool newTitle: false
+    function getTitle() {
+        return newTitle ? "New Title" : "Title";
+    }
+    title: getTitle()
+}
diff --git a/tests/auto/dialogs/tst_dialogs.cpp b/tests/auto/dialogs/tst_dialogs.cpp
index 8303ff83..a764ebec 100644
--- a/tests/auto/dialogs/tst_dialogs.cpp
+++ b/tests/auto/dialogs/tst_dialogs.cpp
@@ -55,6 +55,7 @@ private slots:
     void dialogButtonHandler();
     void dialogKeyHandler_data();
     void dialogKeyHandler();
+    void dialogWithDynamicTitle();
 
     // FileDialog
     void fileDialogDefaultModality();
@@ -370,6 +371,21 @@ void tst_dialogs::fileDialogDefaultSuffix()
     QCOMPARE(dlg->property("defaultSuffix").toString(), QString());
 }
 
+void tst_dialogs::dialogWithDynamicTitle()
+{
+    QQmlEngine engine;
+    QQmlComponent component(&engine);
+    component.loadUrl(testFileUrl("DialogWithDynamicTitle.qml"));
+    QObject *dlg = component.create();
+    QScopedPointer<QObject> cleanup(dlg);
+    QVERIFY2(dlg, qPrintable(component.errorString()));
+    QWindow *window = dlg->findChild<QWindow *>();
+    QVERIFY(window);
+    QTRY_COMPARE(window->title(), QLatin1String("Title"));
+    dlg->setProperty("newTitle", true);
+    QTRY_COMPARE(window->title(), QLatin1String("New Title"));
+}
+
 QTEST_MAIN(tst_dialogs)
 
 #include "tst_dialogs.moc"