1 files changed, 150 insertions, 0 deletions
diff --git a/sd/source/ui/framework/module/ShellStackGuard.cxx b/sd/source/ui/framework/module/ShellStackGuard.cxx
new file mode 100644
index 000000000..83d73b055
--- /dev/null
+++ b/sd/source/ui/framework/module/ShellStackGuard.cxx
@@ -0,0 +1,150 @@
+/* -*- 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 .
+ */
+
+#include "ShellStackGuard.hxx"
+
+#include <framework/ConfigurationController.hxx>
+#include <framework/FrameworkHelper.hxx>
+
+#include <DrawController.hxx>
+#include <ViewShellBase.hxx>
+#include <sfx2/printer.hxx>
+#include <com/sun/star/drawing/framework/XControllerManager.hpp>
+#include <comphelper/servicehelper.hxx>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+using namespace ::com::sun::star::drawing::framework;
+
+using ::sd::framework::FrameworkHelper;
+
+namespace sd::framework {
+
+//===== CenterViewFocusModule ====================================================
+
+ShellStackGuard::ShellStackGuard (Reference<frame::XController> const & rxController)
+    : mpBase(nullptr),
+      maPrinterPollingIdle("sd ShellStackGuard PrinterPollingIdle")
+{
+    Reference<XControllerManager> xControllerManager (rxController, UNO_QUERY);
+    if (xControllerManager.is())
+    {
+        mxConfigurationController = xControllerManager->getConfigurationController();
+
+        // Tunnel through the controller to obtain a ViewShellBase.
+        auto pController = comphelper::getFromUnoTunnel<sd::DrawController>(rxController);
+        if (pController != nullptr)
+            mpBase = pController->GetViewShellBase();
+    }
+
+    if (mxConfigurationController.is())
+    {
+        // Listen for update starts so that the following update can be
+        // prevented in case of a printing printer.
+        mxConfigurationController->addConfigurationChangeListener(
+            this,
+            FrameworkHelper::msConfigurationUpdateStartEvent,
+            Any());
+
+        // Prepare the printer polling.
+        maPrinterPollingIdle.SetInvokeHandler(LINK(this,ShellStackGuard,TimeoutHandler));
+    }
+}
+
+ShellStackGuard::~ShellStackGuard()
+{
+}
+
+void ShellStackGuard::disposing(std::unique_lock<std::mutex>&)
+{
+    if (mxConfigurationController)
+    {
+        mxConfigurationController->removeConfigurationChangeListener(this);
+        mxConfigurationController = nullptr;
+    }
+    mpBase = nullptr;
+}
+
+void SAL_CALL ShellStackGuard::notifyConfigurationChange (
+    const ConfigurationChangeEvent& rEvent)
+{
+    if (rEvent.Type == FrameworkHelper::msConfigurationUpdateStartEvent)
+    {
+        if (mpUpdateLock == nullptr && IsPrinting())
+        {
+            // Prevent configuration updates while the printer is printing.
+            mpUpdateLock.reset(new ConfigurationController::Lock(mxConfigurationController));
+
+            // Start polling for the printer having finished printing.
+            maPrinterPollingIdle.Start();
+        }
+    }
+}
+
+void SAL_CALL ShellStackGuard::disposing (
+    const lang::EventObject& rEvent)
+{
+    if (mxConfigurationController.is())
+        if (rEvent.Source == mxConfigurationController)
+        {
+            mxConfigurationController = nullptr;
+            mpBase = nullptr;
+        }
+}
+
+IMPL_LINK(ShellStackGuard, TimeoutHandler, Timer*, pIdle, void)
+{
+#ifdef DEBUG
+    OSL_ASSERT(pIdle==&maPrinterPollingIdle);
+#else
+    (void)pIdle;
+#endif
+    if (mpUpdateLock == nullptr)
+        return;
+
+    if ( ! IsPrinting())
+    {
+        // Printing finished.  Release the update lock.
+        mpUpdateLock.reset();
+    }
+    else
+    {
+        // Wait long for the printing to finish.
+        maPrinterPollingIdle.Start();
+    }
+}
+
+bool ShellStackGuard::IsPrinting() const
+{
+    if (mpBase != nullptr)
+    {
+        SfxPrinter* pPrinter = mpBase->GetPrinter();
+        if (pPrinter != nullptr
+            && pPrinter->IsPrinting())
+        {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+} // end of namespace sd::framework
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */