1 files changed, 131 insertions, 0 deletions
diff --git a/sd/source/ui/presenter/CanvasUpdateRequester.cxx b/sd/source/ui/presenter/CanvasUpdateRequester.cxx
new file mode 100644
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+++ b/sd/source/ui/presenter/CanvasUpdateRequester.cxx
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+/* -*- 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 "CanvasUpdateRequester.hxx"
+#include <vcl/svapp.hxx>
+#include <com/sun/star/lang/XComponent.hpp>
+#include <com/sun/star/rendering/XSpriteCanvas.hpp>
+#include <cppuhelper/weakref.hxx>
+#include <vector>
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+
+namespace sd::presenter {
+
+//===== CanvasUpdateRequester::Deleter ========================================
+
+class CanvasUpdateRequester::Deleter
+{
+public:
+    void operator() (CanvasUpdateRequester* pObject) { delete pObject; }
+};
+
+//===== CanvasUpdateRequester =================================================
+
+std::shared_ptr<CanvasUpdateRequester> CanvasUpdateRequester::Instance (
+    const Reference<rendering::XSpriteCanvas>& rxSharedCanvas)
+{
+    // this global must not own anything or we crash on shutdown
+    static std::vector<std::pair<
+        uno::WeakReference<rendering::XSpriteCanvas>,
+        std::weak_ptr<CanvasUpdateRequester>>> s_RequesterMap;
+    for (auto it = s_RequesterMap.begin(); it != s_RequesterMap.end(); )
+    {
+        uno::Reference<rendering::XSpriteCanvas> const xCanvas(it->first);
+        if (!xCanvas.is())
+        {
+            it = s_RequesterMap.erase(it); // remove stale entry
+        }
+        else if (xCanvas == rxSharedCanvas)
+        {
+            std::shared_ptr<CanvasUpdateRequester> pRequester(it->second);
+            if (pRequester)
+            {
+                return pRequester;
+            }
+            else
+            {
+                std::shared_ptr<CanvasUpdateRequester> const pNew(
+                        new CanvasUpdateRequester(rxSharedCanvas), Deleter());
+                it->second = pNew;
+                return pNew;
+            }
+        }
+        else
+        {
+            ++it;
+        }
+    }
+
+    // No requester for the given canvas found.  Create a new one.
+    std::shared_ptr<CanvasUpdateRequester> pRequester (
+        new CanvasUpdateRequester(rxSharedCanvas), Deleter());
+    s_RequesterMap.emplace_back(rxSharedCanvas, pRequester);
+    return pRequester;
+}
+
+
+CanvasUpdateRequester::CanvasUpdateRequester (
+        const Reference<rendering::XSpriteCanvas>& rxCanvas)
+    : mxCanvas(rxCanvas)
+    , m_pUserEventId(nullptr)
+    , mbUpdateFlag(false)
+{
+    Reference<lang::XComponent> xComponent (mxCanvas, UNO_QUERY);
+    if (xComponent.is())
+    {
+        //xComponent->addEventListener(this);
+    }
+}
+
+CanvasUpdateRequester::~CanvasUpdateRequester()
+{
+    assert(m_pUserEventId == nullptr);
+}
+
+void CanvasUpdateRequester::RequestUpdate (const bool bUpdateAll)
+{
+    if (m_pUserEventId == nullptr)
+    {
+        m_pThis = shared_from_this(); // keep instance alive until dispatch
+        mbUpdateFlag = bUpdateAll;
+        m_pUserEventId = Application::PostUserEvent(LINK(this, CanvasUpdateRequester, Callback));
+    }
+    else
+    {
+        mbUpdateFlag |= bUpdateAll;
+    }
+}
+
+IMPL_LINK_NOARG(CanvasUpdateRequester, Callback, void*, void)
+{
+    m_pUserEventId = nullptr;
+    if (mxCanvas.is())
+    {
+        mxCanvas->updateScreen(mbUpdateFlag);
+        mbUpdateFlag = false;
+    }
+    assert(m_pThis);
+    m_pThis.reset(); // possibly delete "this"
+}
+
+} // end of namespace ::sd::presenter
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */