Add attribute Qt::AA_DontUseNativeDialogs.

The attribute can be set to suppress native dialogs for example
for testing purposes.

Task-number: QTBUG-51074
Change-Id: I35611e07e00b7a060f22b49d6ab6f3b8627f8aca
Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>

5 files changed, 17 insertions, 9 deletions

diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index 25973a3ae4..b6d8e6fdc8 100644
--- a/src/corelib/global/qnamespace.h
+++ b/src/corelib/global/qnamespace.h
@@ -506,6 +506,7 @@ public:
         AA_EnableHighDpiScaling = 20,
         AA_DisableHighDpiScaling = 21,
         AA_UseStyleSheetPropagationInWidgetStyles = 22, // ### Qt 6: remove me
+        AA_DontUseNativeDialogs = 23,
 
         // Add new attributes before this line
         AA_AttributeCount
diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc
index 1efcce393d..b17a1ab48b 100644
--- a/src/corelib/global/qnamespace.qdoc
+++ b/src/corelib/global/qnamespace.qdoc
@@ -230,6 +230,10 @@
            \l{The Style Sheet Syntax#Inheritance}{The Style Sheet Syntax - Inheritance}
            for more details. This value has been added in Qt 5.7.
 
+    \value AA_DontUseNativeDialogs All dialogs created while this attribute is
+           set to true won't use the native dialogs provided by the platform.
+           This value has been added in Qt 5.7.
+
     The following values are obsolete:
 
     \value AA_ImmediateWidgetCreation This attribute is no longer fully
diff --git a/src/widgets/dialogs/qcolordialog.cpp b/src/widgets/dialogs/qcolordialog.cpp
index 47f2e76faf..9f86bea0ca 100644
--- a/src/widgets/dialogs/qcolordialog.cpp
+++ b/src/widgets/dialogs/qcolordialog.cpp
@@ -1909,10 +1909,11 @@ bool QColorDialogPrivate::canBeNativeDialog() const
     Q_Q(const QColorDialog);
     if (nativeDialogInUse)
         return true;
-    if (q->testAttribute(Qt::WA_DontShowOnScreen))
-        return false;
-    if (q->options() & QColorDialog::DontUseNativeDialog)
+    if (QCoreApplication::testAttribute(Qt::AA_DontUseNativeDialogs)
+        || q->testAttribute(Qt::WA_DontShowOnScreen)
+        || (q->options() & QColorDialog::DontUseNativeDialog)) {
         return false;
+    }
 
     QLatin1String staticName(QColorDialog::staticMetaObject.className());
     QLatin1String dynamicName(q->metaObject()->className());
diff --git a/src/widgets/dialogs/qfiledialog.cpp b/src/widgets/dialogs/qfiledialog.cpp
index 288922d740..ca2b0c0889 100644
--- a/src/widgets/dialogs/qfiledialog.cpp
+++ b/src/widgets/dialogs/qfiledialog.cpp
@@ -704,10 +704,11 @@ bool QFileDialogPrivate::canBeNativeDialog() const
     Q_Q(const QFileDialog);
     if (nativeDialogInUse)
         return true;
-    if (q->testAttribute(Qt::WA_DontShowOnScreen))
-        return false;
-    if (q->options() & QFileDialog::DontUseNativeDialog)
+    if (QCoreApplication::testAttribute(Qt::AA_DontUseNativeDialogs)
+        || q->testAttribute(Qt::WA_DontShowOnScreen)
+        || (q->options() & QFileDialog::DontUseNativeDialog)) {
         return false;
+    }
 
     QLatin1String staticName(QFileDialog::staticMetaObject.className());
     QLatin1String dynamicName(q->metaObject()->className());
diff --git a/src/widgets/dialogs/qfontdialog.cpp b/src/widgets/dialogs/qfontdialog.cpp
index 7dbcf15b73..a0525f6fbd 100644
--- a/src/widgets/dialogs/qfontdialog.cpp
+++ b/src/widgets/dialogs/qfontdialog.cpp
@@ -1043,10 +1043,11 @@ bool QFontDialogPrivate::canBeNativeDialog() const
     Q_Q(const QFontDialog);
     if (nativeDialogInUse)
         return true;
-    if (q->testAttribute(Qt::WA_DontShowOnScreen))
-        return false;
-    if (options->options() & QFontDialog::DontUseNativeDialog)
+    if (QCoreApplication::testAttribute(Qt::AA_DontUseNativeDialogs)
+        || q->testAttribute(Qt::WA_DontShowOnScreen)
+        || (options->options() & QFontDialog::DontUseNativeDialog)) {
         return false;
+    }
 
     QLatin1String staticName(QFontDialog::staticMetaObject.className());
     QLatin1String dynamicName(q->metaObject()->className());