Add DropArea_qtwidgets stub

src/qtwidgets/views/DropArea_qtwidgets.h

@@ -0,0 +1,46 @@
+/*
+  This file is part of KDDockWidgets.
+
+  SPDX-FileCopyrightText: 2019-2022 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+  Author: Sérgio Martins <sergio.martins@kdab.com>
+
+  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+
+  Contact KDAB at <info@kdab.com> for commercial licensing options.
+*/
+
+/**
+ * @file
+ * @brief A MultiSplitter with support for drop indicators when hovering over.
+ *
+ * @author Sérgio Martins \<sergio.martins@kdab.com\>
+ */
+
+#pragma once
+
+#include "kddockwidgets/docks_export.h"
+#include "kddockwidgets/KDDockWidgets.h"
+
+#include "private/MultiSplitter_p.h"
+
+namespace KDDockWidgets {
+
+namespace Controllers {
+class DropArea;
+}
+
+namespace Views {
+
+class DOCKS_EXPORT DropArea_qtwidgets : public MultiSplitter
+{
+    Q_OBJECT
+public:
+    explicit DropArea_qtwidgets(Controllers::DropArea *, View *parent);
+    ~DropArea_qtwidgets();
+
+private:
+    Controllers::DropArea *const m_dropArea;
+};
+
+}
+}