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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: */