1 files changed, 50 insertions, 0 deletions
diff --git a/src/quickcontrolsimpl/qquickplatformtheme.cpp b/src/quickcontrolsimpl/qquickplatformtheme.cpp
new file mode 100644
index 0000000000..c9f4fa9bdb
--- /dev/null
+++ b/src/quickcontrolsimpl/qquickplatformtheme.cpp
@@ -0,0 +1,50 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qquickplatformtheme_p.h"
+
+#include <QtGui/private/qguiapplication_p.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \internal
+
+    Exposes platform theme hints to QML so that we have a more accurate way of checking
+    for platform-specific behavior than \c {Qt.platform.os === "foo"}.
+*/
+QQuickPlatformTheme::QQuickPlatformTheme(QObject *parent) :
+    QObject(parent)
+{
+}
+
+QVariant QQuickPlatformTheme::themeHint(QPlatformTheme::ThemeHint themeHint) const
+{
+    return getThemeHint(themeHint);
+}
+
+/*!
+    \internal
+
+    This is static to allow us to call it from C++, as we're only available as a singleton in QML.
+*/
+QVariant QQuickPlatformTheme::getThemeHint(QPlatformTheme::ThemeHint themeHint)
+{
+    // Allow tests to force some theme hint values, otherwise they get very messy and difficult to understand.
+    switch (themeHint) {
+    case QPlatformTheme::ShowDirectoriesFirst: {
+        bool isInt = false;
+        const int showDirsFirst = qEnvironmentVariableIntValue("QT_QUICK_DIALOGS_SHOW_DIRS_FIRST", &isInt);
+        if (isInt)
+            return showDirsFirst != 0;
+        break;
+    }
+    default:
+        break;
+    }
+    return QGuiApplicationPrivate::platformTheme()->themeHint(themeHint);
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qquickplatformtheme_p.cpp"