Allow disable native messagebox dialog

The native style may not match the program style and it
makes sense to give an option rather than forcing native style.

Before it could only be done with setting AA_DontUseNativeDialogs
on the app, but it is reasonable to use native file dialogs and
Qt styled messageboxes - and it is extremely cumbersome - especially
since messageboxes often can start save dialogs.

It can look a bit strange that these introduced options has just one
option (DontUseNativeDialog) and four functions, but this way it works
similar to QColorDialog, QFileDialog and QFontDialog.

[ChangeLog][QWidgets][QMessageBox] Added options functionality to
QMessagebox. The currently only option available is DontUseNativeDialog.

Change-Id: I70282fcfaa66f245f7e679b8897c607bcaff333f
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/auto/widgets/dialogs/qmessagebox/tst_qmessagebox.cpp b/tests/auto/widgets/dialogs/qmessagebox/tst_qmessagebox.cpp
index 122170e91d..afdf18fedc 100644
--- a/tests/auto/widgets/dialogs/qmessagebox/tst_qmessagebox.cpp
+++ b/tests/auto/widgets/dialogs/qmessagebox/tst_qmessagebox.cpp
@@ -38,6 +38,9 @@ private slots:
     void detailsButtonText();
     void expandDetailsWithoutMoving();
 
+    void optionsEmptyByDefault();
+    void changeNativeOption();
+
 #ifndef Q_OS_MAC
     void shortcut();
 #endif
@@ -584,6 +587,20 @@ void tst_QMessageBox::expandDetailsWithoutMoving() // QTBUG-32473
     QCOMPARE(box.geometry().topLeft(), geom.topLeft());
 }
 
+void tst_QMessageBox::optionsEmptyByDefault()
+{
+    QMessageBox b;
+    QCOMPARE(b.options(), QMessageBox::Options());
+    QVERIFY(!b.testOption(QMessageBox::Option::DontUseNativeDialog));
+}
+
+void tst_QMessageBox::changeNativeOption()
+{
+    QMessageBox b;
+    b.setOption(QMessageBox::Option::DontUseNativeDialog);
+    QCOMPARE(b.options(), QMessageBox::Options(QMessageBox::Option::DontUseNativeDialog));
+}
+
 void tst_QMessageBox::incorrectDefaultButton()
 {
     ExecCloseHelper closeHelper;