1 files changed, 139 insertions, 0 deletions
diff --git a/sd/source/ui/slidesorter/controller/SlsSelectionObserver.cxx b/sd/source/ui/slidesorter/controller/SlsSelectionObserver.cxx
new file mode 100644
index 000000000..8fb0493a0
--- /dev/null
+++ b/sd/source/ui/slidesorter/controller/SlsSelectionObserver.cxx
@@ -0,0 +1,139 @@
+/* -*- 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 <SlideSorter.hxx>
+#include <controller/SlideSorterController.hxx>
+#include <controller/SlsSelectionManager.hxx>
+#include <controller/SlsSelectionObserver.hxx>
+#include <controller/SlsPageSelector.hxx>
+#include <controller/SlsFocusManager.hxx>
+#include <sdpage.hxx>
+#include <osl/diagnose.h>
+
+namespace sd::slidesorter::controller
+{
+SelectionObserver::Context::Context(SlideSorter const& rSlideSorter)
+    : mpSelectionObserver(
+          rSlideSorter.GetController().GetSelectionManager()->GetSelectionObserver())
+{
+    if (mpSelectionObserver)
+        mpSelectionObserver->StartObservation();
+}
+
+SelectionObserver::Context::~Context() COVERITY_NOEXCEPT_FALSE
+{
+    if (mpSelectionObserver)
+        mpSelectionObserver->EndObservation();
+}
+
+void SelectionObserver::Context::Abort()
+{
+    if (mpSelectionObserver)
+    {
+        mpSelectionObserver->AbortObservation();
+        mpSelectionObserver.reset();
+    }
+}
+
+//===== SelectionObserver =====================================================
+
+SelectionObserver::SelectionObserver(SlideSorter& rSlideSorter)
+    : mrSlideSorter(rSlideSorter)
+    , mbIsObservationActive(false)
+    , mbPageEventOccurred(false)
+{
+}
+
+SelectionObserver::~SelectionObserver() {}
+
+void SelectionObserver::NotifyPageEvent(const SdrPage* pSdrPage)
+{
+    if (!mbIsObservationActive)
+        return;
+
+    mbPageEventOccurred = true;
+
+    const SdPage* pPage = dynamic_cast<const SdPage*>(pSdrPage);
+    if (pPage == nullptr)
+        return;
+
+    //NotifyPageEvent is called for add, remove, *and* change position so for
+    //the change position case we must ensure we don't end up with the slide
+    //duplicated in our list
+    std::vector<const SdPage*>::iterator iPage(
+        std::find(maInsertedPages.begin(), maInsertedPages.end(), pPage));
+    if (iPage != maInsertedPages.end())
+        maInsertedPages.erase(iPage);
+
+    if (pPage->IsInserted())
+        maInsertedPages.push_back(pPage);
+}
+
+void SelectionObserver::StartObservation()
+{
+    OSL_ASSERT(!mbIsObservationActive);
+    maInsertedPages.clear();
+    mbIsObservationActive = true;
+}
+
+void SelectionObserver::AbortObservation()
+{
+    OSL_ASSERT(mbIsObservationActive);
+    mbIsObservationActive = false;
+    maInsertedPages.clear();
+}
+
+void SelectionObserver::EndObservation()
+{
+    OSL_ASSERT(mbIsObservationActive);
+    mbIsObservationActive = false;
+
+    if (!mbPageEventOccurred)
+        return;
+
+    PageSelector& rSelector(mrSlideSorter.GetController().GetPageSelector());
+    PageSelector::UpdateLock aUpdateLock(mrSlideSorter);
+    rSelector.DeselectAllPages();
+    if (!maInsertedPages.empty())
+    {
+        // Select the inserted pages.
+        for (const auto& rpPage : maInsertedPages)
+        {
+            rSelector.SelectPage(rpPage);
+        }
+        maInsertedPages.clear();
+    }
+
+    aUpdateLock.Release();
+    FocusManager& rFocusManager = mrSlideSorter.GetController().GetFocusManager();
+    bool bSuccess = rFocusManager.SetFocusedPageToCurrentPage();
+    // tdf#129346 nothing currently selected, select something, if possible
+    // but (tdf#129346) only if setting focus to current page failed
+    if (rSelector.GetPageCount() && rSelector.GetSelectedPageCount() == 0)
+    {
+        if (bSuccess)
+            rSelector.SelectPage(rFocusManager.GetFocusedPageDescriptor());
+        else
+            rSelector.SelectPage(0);
+    }
+}
+
+} // end of namespace ::sd::slidesorter::controller
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */