1 files changed, 264 insertions, 0 deletions
diff --git a/sd/source/ui/sidebar/MasterPageContainerQueue.cxx b/sd/source/ui/sidebar/MasterPageContainerQueue.cxx
new file mode 100644
index 0000000000..e65d1861d9
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+++ b/sd/source/ui/sidebar/MasterPageContainerQueue.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 "MasterPageContainerQueue.hxx"
+#include "MasterPageContainerProviders.hxx"
+
+#include <tools/IdleDetection.hxx>
+
+#include <set>
+#include <utility>
+
+namespace sd::sidebar {
+
+const sal_Int32 MasterPageContainerQueue::snDelayedCreationTimeout (15);
+const sal_Int32 MasterPageContainerQueue::snDelayedCreationTimeoutWhenNotIdle (100);
+const sal_Int32 MasterPageContainerQueue::snMasterPagePriorityBoost (5);
+const sal_Int32 MasterPageContainerQueue::snWaitForMoreRequestsPriorityThreshold (-10);
+sal_uInt32 MasterPageContainerQueue::snWaitForMoreRequestsCount(15);
+
+//===== MasterPageContainerQueue::PreviewCreationRequest ======================
+
+class MasterPageContainerQueue::PreviewCreationRequest
+{
+public:
+    PreviewCreationRequest (SharedMasterPageDescriptor pDescriptor, int nPriority)
+        : mpDescriptor(std::move(pDescriptor)),
+          mnPriority(nPriority)
+    {}
+    SharedMasterPageDescriptor mpDescriptor;
+    int mnPriority;
+    class Compare
+    {
+    public:
+        bool operator() (const PreviewCreationRequest& r1,const PreviewCreationRequest& r2) const
+        {
+            if (r1.mnPriority != r2.mnPriority)
+            {
+                // Prefer requests with higher priority.
+                return r1.mnPriority > r2.mnPriority;
+            }
+            else
+            {
+                // Prefer tokens that have been earlier created (those with lower
+                // value).
+                return r1.mpDescriptor->maToken < r2.mpDescriptor->maToken;
+            }
+        }
+    };
+    class CompareToken
+    {
+    public:
+        MasterPageContainer::Token maToken;
+        explicit CompareToken(MasterPageContainer::Token aToken) : maToken(aToken) {}
+        bool operator() (const PreviewCreationRequest& rRequest) const
+            { return maToken==rRequest.mpDescriptor->maToken; }
+    };
+};
+
+//===== MasterPageContainerQueue::RequestQueue ================================
+
+class MasterPageContainerQueue::RequestQueue
+    : public ::std::set<PreviewCreationRequest,PreviewCreationRequest::Compare>
+{
+public:
+    RequestQueue() {}
+};
+
+//===== MasterPageContainerQueue ==============================================
+
+MasterPageContainerQueue* MasterPageContainerQueue::Create (
+    const std::weak_ptr<ContainerAdapter>& rpContainer)
+{
+    MasterPageContainerQueue* pQueue = new MasterPageContainerQueue(rpContainer);
+    pQueue->LateInit();
+    return pQueue;
+}
+
+MasterPageContainerQueue::MasterPageContainerQueue (
+    std::weak_ptr<ContainerAdapter> pContainer)
+    : mpWeakContainer(std::move(pContainer)),
+      mpRequestQueue(new RequestQueue()),
+      maDelayedPreviewCreationTimer("sd MasterPageContainerQueue maDelayedPreviewCreationTimer"),
+      mnRequestsServedCount(0)
+{
+}
+
+MasterPageContainerQueue::~MasterPageContainerQueue()
+{
+    maDelayedPreviewCreationTimer.Stop();
+    while ( ! mpRequestQueue->empty())
+        mpRequestQueue->erase(mpRequestQueue->begin());
+}
+
+void MasterPageContainerQueue::LateInit()
+{
+    // Set up the timer for the delayed creation of preview bitmaps.
+    maDelayedPreviewCreationTimer.SetTimeout (snDelayedCreationTimeout);
+    maDelayedPreviewCreationTimer.SetInvokeHandler(
+        LINK(this,MasterPageContainerQueue,DelayedPreviewCreation) );
+}
+
+bool MasterPageContainerQueue::RequestPreview (const SharedMasterPageDescriptor& rpDescriptor)
+{
+    bool bSuccess (false);
+    if (rpDescriptor
+        && rpDescriptor->maLargePreview.GetSizePixel().Width() == 0)
+    {
+        sal_Int32 nPriority (CalculatePriority(rpDescriptor));
+
+        // Add a new or replace an existing request.
+        RequestQueue::iterator iRequest (::std::find_if(
+            mpRequestQueue->begin(),
+            mpRequestQueue->end(),
+            PreviewCreationRequest::CompareToken(rpDescriptor->maToken)));
+        // When a request for the same token exists then the lowest of the
+        // two priorities is used.
+        if (iRequest != mpRequestQueue->end())
+            if (iRequest->mnPriority < nPriority)
+            {
+                mpRequestQueue->erase(iRequest);
+                iRequest = mpRequestQueue->end();
+            }
+
+        // Add a new request when none exists (or has just been erased).
+        if (iRequest == mpRequestQueue->end())
+        {
+            mpRequestQueue->insert(PreviewCreationRequest(rpDescriptor,nPriority));
+            maDelayedPreviewCreationTimer.Start();
+            bSuccess = true;
+        }
+    }
+    return bSuccess;
+}
+
+sal_Int32 MasterPageContainerQueue::CalculatePriority (
+    const SharedMasterPageDescriptor& rpDescriptor)
+{
+    sal_Int32 nPriority;
+
+    // The cost is used as a starting value.
+    int nCost (0);
+    if (rpDescriptor->mpPreviewProvider != nullptr)
+    {
+        nCost = rpDescriptor->mpPreviewProvider->GetCostIndex();
+        if (rpDescriptor->mpPreviewProvider->NeedsPageObject())
+            if (rpDescriptor->mpPageObjectProvider != nullptr)
+                nCost += rpDescriptor->mpPageObjectProvider->GetCostIndex();
+    }
+
+    // Its negative value is used so that requests with a low cost are
+    // preferred over those with high costs.
+    nPriority = -nCost;
+
+    // Add a term that introduces an order based on the appearance in the
+    // AllMasterPagesSelector.
+    nPriority -= rpDescriptor->maToken / 3;
+
+    // Process requests for the CurrentMasterPagesSelector first.
+    if (rpDescriptor->meOrigin == MasterPageContainer::MASTERPAGE)
+        nPriority += snMasterPagePriorityBoost;
+
+    return nPriority;
+}
+
+IMPL_LINK(MasterPageContainerQueue, DelayedPreviewCreation, Timer*, pTimer, void)
+{
+    bool bIsShowingFullScreenShow (false);
+    bool bWaitForMoreRequests (false);
+
+    do
+    {
+        if (mpRequestQueue->empty())
+            break;
+
+        // First check whether the system is idle.
+        tools::IdleState nIdleState (tools::IdleDetection::GetIdleState(nullptr));
+        if (nIdleState != tools::IdleState::Idle)
+        {
+            if (nIdleState & tools::IdleState::FullScreenShowActive)
+                bIsShowingFullScreenShow = true;
+            break;
+        }
+
+        PreviewCreationRequest aRequest (*mpRequestQueue->begin());
+
+        // Check if the request should really be processed right now.
+        // Reasons to not do it are when its cost is high and not many other
+        // requests have been inserted into the queue that would otherwise
+        // be processed first.
+        if (aRequest.mnPriority < snWaitForMoreRequestsPriorityThreshold
+            && (mnRequestsServedCount+mpRequestQueue->size() < snWaitForMoreRequestsCount))
+        {
+            // Wait for more requests before this one is processed.  Note
+            // that the queue processing is not started anew when this
+            // method is left.  That is done when the next request is
+            // inserted.
+            bWaitForMoreRequests = true;
+            break;
+        }
+
+        mpRequestQueue->erase(mpRequestQueue->begin());
+
+        if (aRequest.mpDescriptor)
+        {
+            mnRequestsServedCount += 1;
+            if ( ! mpWeakContainer.expired())
+            {
+                std::shared_ptr<ContainerAdapter> pContainer (mpWeakContainer);
+                if (pContainer != nullptr)
+                    pContainer->UpdateDescriptor(aRequest.mpDescriptor,false,true,true);
+            }
+        }
+    }
+    while (false);
+
+    if (!mpRequestQueue->empty() && ! bWaitForMoreRequests)
+    {
+        int nTimeout (snDelayedCreationTimeout);
+        if (bIsShowingFullScreenShow)
+            nTimeout = snDelayedCreationTimeoutWhenNotIdle;
+        maDelayedPreviewCreationTimer.SetTimeout(nTimeout);
+        pTimer->Start();
+    }
+}
+
+bool MasterPageContainerQueue::HasRequest (MasterPageContainer::Token aToken) const
+{
+    return std::any_of(
+        mpRequestQueue->begin(),
+        mpRequestQueue->end(),
+        PreviewCreationRequest::CompareToken(aToken));
+}
+
+bool MasterPageContainerQueue::IsEmpty() const
+{
+    return mpRequestQueue->empty();
+}
+
+void MasterPageContainerQueue::ProcessAllRequests()
+{
+    snWaitForMoreRequestsCount = 0;
+    if (!mpRequestQueue->empty())
+        maDelayedPreviewCreationTimer.Start();
+}
+
+} // end of namespace sd::sidebar
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */