1 files changed, 96 insertions, 0 deletions
diff --git a/sd/source/ui/framework/module/ShellStackGuard.hxx b/sd/source/ui/framework/module/ShellStackGuard.hxx
new file mode 100644
index 0000000000..fe94037816
--- /dev/null
+++ b/sd/source/ui/framework/module/ShellStackGuard.hxx
@@ -0,0 +1,96 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <framework/ConfigurationController.hxx>
+
+#include <com/sun/star/drawing/framework/XConfigurationChangeListener.hpp>
+
+#include <rtl/ref.hxx>
+#include <vcl/idle.hxx>
+#include <comphelper/compbase.hxx>
+#include <memory>
+
+namespace com::sun::star::drawing::framework
+{
+class XConfigurationController;
+}
+namespace com::sun::star::frame
+{
+class XController;
+}
+
+namespace sd
+{
+class DrawController;
+class ViewShellBase;
+}
+
+namespace sd::framework
+{
+typedef comphelper::WeakComponentImplHelper<css::drawing::framework::XConfigurationChangeListener>
+    ShellStackGuardInterfaceBase;
+
+/** This module locks updates of the current configuration in situations
+    when the shell stack must not be modified.
+
+    On every start of a configuration update the ShellStackGuard checks the
+    printer.  If it is printing the configuration update is locked.  It then
+    polls the printer and unlocks updates when printing finishes.
+
+    When in the future there are no resources left that use shells then this
+    module can be removed.
+*/
+class ShellStackGuard : public ShellStackGuardInterfaceBase
+{
+public:
+    explicit ShellStackGuard(rtl::Reference<sd::DrawController> const& rxController);
+    virtual ~ShellStackGuard() override;
+
+    virtual void disposing(std::unique_lock<std::mutex>&) override;
+
+    // XConfigurationChangeListener
+
+    virtual void SAL_CALL notifyConfigurationChange(
+        const css::drawing::framework::ConfigurationChangeEvent& rEvent) override;
+
+    // XEventListener
+
+    virtual void SAL_CALL disposing(const css::lang::EventObject& rEvent) override;
+
+private:
+    css::uno::Reference<css::drawing::framework::XConfigurationController>
+        mxConfigurationController;
+    ViewShellBase* mpBase;
+    std::unique_ptr<ConfigurationController::Lock> mpUpdateLock;
+    Idle maPrinterPollingIdle;
+
+    DECL_LINK(TimeoutHandler, Timer*, void);
+
+    /** Return <TRUE/> when the printer is printing.  Return <FALSE/> when
+        the printer is not printing, or there is no printer, or something
+        else went wrong.
+    */
+    bool IsPrinting() const;
+};
+
+} // end of namespace sd::framework
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */