1 files changed, 15 insertions, 0 deletions
diff --git a/include/vcl/waitobj.hxx b/include/vcl/waitobj.hxx
index daf0e2a68a4f..858f49d4ae9b 100644
--- a/include/vcl/waitobj.hxx
+++ b/include/vcl/waitobj.hxx
@@ -23,6 +23,9 @@
 #include <vcl/dllapi.h>
 #include <vcl/window.hxx>
 
+#include <stack>
+#include <vector>
+
 class VCL_DLLPUBLIC WaitObject
 {
 private:
@@ -37,6 +40,18 @@ public:
                 ~WaitObject();
 };
 
+class VCL_DLLPUBLIC TopLevelWindowLocker
+{
+private:
+    std::stack<std::vector<VclPtr<vcl::Window>>> m_aBusyStack;
+public:
+    // lock all toplevels, except the argument
+    void incBusy(const vcl::Window* pIgnore);
+    // unlock previous lock
+    void decBusy();
+    bool isBusy() const { return !m_aBusyStack.empty(); }
+};
+
 #endif // INCLUDED_VCL_WAITOBJ_HXX
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */