sd/source/ui/presenter/CanvasUpdateRequester.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include "CanvasUpdateRequester.hxx"
  21 #include <vcl/svapp.hxx>
  22 #include <com/sun/star/lang/XComponent.hpp>
  23 #include <com/sun/star/rendering/XSpriteCanvas.hpp>
  24 #include <cppuhelper/weakref.hxx>
  25 #include <vector>
  26
  27 using namespace ::com::sun::star;
  28 using namespace ::com::sun::star::uno;
  29
  30 namespace sd { namespace presenter {
  31
  32 //===== CanvasUpdateRequester::Deleter ========================================
  33
  34 class CanvasUpdateRequester::Deleter
  35 {
  36 public:
  37     void operator() (CanvasUpdateRequester* pObject) { delete pObject; }
  38 };
  39
  40 //===== CanvasUpdateRequester =================================================
  41
  42 std::shared_ptr<CanvasUpdateRequester> CanvasUpdateRequester::Instance (
  43     const Reference<rendering::XSpriteCanvas>& rxSharedCanvas)
  44 {
  45     // this global must not own anything or we crash on shutdown
  46     static std::vector<std::pair<
  47         uno::WeakReference<rendering::XSpriteCanvas>,
  48         std::weak_ptr<CanvasUpdateRequester>>> s_RequesterMap;
  49     for (auto it = s_RequesterMap.begin(); it != s_RequesterMap.end(); )
  50     {
  51         uno::Reference<rendering::XSpriteCanvas> const xCanvas(it->first);
  52         if (!xCanvas.is())
  53         {
  54             it = s_RequesterMap.erase(it); // remove stale entry
  55         }
  56         else if (xCanvas == rxSharedCanvas)
  57         {
  58             std::shared_ptr<CanvasUpdateRequester> pRequester(it->second);
  59             if (pRequester)
  60             {
  61                 return pRequester;
  62             }
  63             else
  64             {
  65                 std::shared_ptr<CanvasUpdateRequester> const pNew(
  66                         new CanvasUpdateRequester(rxSharedCanvas), Deleter());
  67                 it->second = pNew;
  68                 return pNew;
  69             }
  70         }
  71         else
  72         {
  73             ++it;
  74         }
  75     }
  76
  77     // No requester for the given canvas found.  Create a new one.
  78     std::shared_ptr<CanvasUpdateRequester> pRequester (
  79         new CanvasUpdateRequester(rxSharedCanvas), Deleter());
  80     s_RequesterMap.emplace_back(rxSharedCanvas, pRequester);
  81     return pRequester;
  82 }
  83
  84
  85 CanvasUpdateRequester::CanvasUpdateRequester (
  86         const Reference<rendering::XSpriteCanvas>& rxCanvas)
  87     : mxCanvas(rxCanvas)
  88     , m_pUserEventId(nullptr)
  89     , mbUpdateFlag(false)
  90 {
  91     Reference<lang::XComponent> xComponent (mxCanvas, UNO_QUERY);
  92     if (xComponent.is())
  93     {
  94         //xComponent->addEventListener(this);
  95     }
  96 }
  97
  98 CanvasUpdateRequester::~CanvasUpdateRequester()
  99 {
 100     assert(m_pUserEventId == nullptr);
 101 }
 102
 103 void CanvasUpdateRequester::RequestUpdate (const bool bUpdateAll)
 104 {
 105     if (m_pUserEventId == nullptr)
 106     {
 107         m_pThis = shared_from_this(); // keep instance alive until dispatch
 108         mbUpdateFlag = bUpdateAll;
 109         m_pUserEventId = Application::PostUserEvent(LINK(this, CanvasUpdateRequester, Callback));
 110     }
 111     else
 112     {
 113         mbUpdateFlag |= bUpdateAll;
 114     }
 115 }
 116
 117 IMPL_LINK_NOARG(CanvasUpdateRequester, Callback, void*, void)
 118 {
 119     m_pUserEventId = nullptr;
 120     if (mxCanvas.is())
 121     {
 122         mxCanvas->updateScreen(mbUpdateFlag);
 123         mbUpdateFlag = false;
 124     }
 125     assert(m_pThis);
 126     m_pThis.reset(); // possibly delete "this"
 127 }
 128
 129 } } // end of namespace ::sd::presenter
 130
 131 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */