1 files changed, 202 insertions, 0 deletions
diff --git a/sd/source/ui/slidesorter/model/SlsPageEnumeration.cxx b/sd/source/ui/slidesorter/model/SlsPageEnumeration.cxx
new file mode 100644
index 000000000..a67f057e7
--- /dev/null
+++ b/sd/source/ui/slidesorter/model/SlsPageEnumeration.cxx
@@ -0,0 +1,202 @@
+/* -*- 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 <memory>
+#include <sal/config.h>
+
+#include <utility>
+
+#include <model/SlsPageEnumeration.hxx>
+#include <model/SlideSorterModel.hxx>
+
+using namespace ::sd::slidesorter;
+using namespace ::sd::slidesorter::model;
+
+namespace {
+
+class PageEnumerationImpl
+    : public Enumeration<SharedPageDescriptor>
+{
+public:
+    PageEnumerationImpl (
+        const SlideSorterModel& rModel,
+        const PageEnumeration::PagePredicate& rPredicate);
+    PageEnumerationImpl(const PageEnumerationImpl&) = delete;
+    PageEnumerationImpl& operator=(const PageEnumerationImpl&) = delete;
+    /** Create a copy of the called enumeration object.
+    */
+    virtual ::std::unique_ptr<Enumeration<SharedPageDescriptor> > Clone() override;
+
+    virtual bool HasMoreElements() const override;
+    virtual SharedPageDescriptor GetNextElement() override;
+    virtual void Rewind() override;
+
+private:
+    const SlideSorterModel& mrModel;
+    const PageEnumeration::PagePredicate maPredicate;
+    int mnIndex;
+
+    /** This constructor sets the internal page index to the given value.
+        It does not call AdvanceToNextValidElement() to skip elements that
+        do not fulfill Predicate.
+    */
+    PageEnumerationImpl (
+        const SlideSorterModel& rModel,
+        const PageEnumeration::PagePredicate& rPredicate,
+        int nIndex);
+
+    /** Skip all elements that do not fulfill Predicate starting with the
+        one pointed to by mnIndex.
+    */
+    void AdvanceToNextValidElement();
+};
+
+} // end of anonymous namespace
+
+namespace sd::slidesorter::model {
+
+PageEnumeration PageEnumeration::Create (
+    const SlideSorterModel& rModel,
+    const PagePredicate& rPredicate)
+{
+    return PageEnumeration(::std::unique_ptr<Enumeration<SharedPageDescriptor> >(
+        new PageEnumerationImpl(rModel, rPredicate)));
+}
+
+PageEnumeration::PageEnumeration (
+    ::std::unique_ptr<Enumeration<SharedPageDescriptor> > && pImpl)
+    : mpImpl(std::move(pImpl))
+{
+}
+
+PageEnumeration::PageEnumeration (const PageEnumeration& rEnumeration )
+: sd::slidesorter::model::Enumeration<sd::slidesorter::model::SharedPageDescriptor>()
+{
+    mpImpl = rEnumeration.mpImpl->Clone();
+}
+
+PageEnumeration::~PageEnumeration()
+{
+}
+
+PageEnumeration& PageEnumeration::operator= (
+    const PageEnumeration& rEnumeration)
+{
+    mpImpl = rEnumeration.mpImpl->Clone();
+    return *this;
+}
+
+::std::unique_ptr<Enumeration<SharedPageDescriptor> > PageEnumeration::Clone()
+{
+    return ::std::unique_ptr<Enumeration<SharedPageDescriptor> >(
+        new PageEnumeration (*this));
+}
+
+bool PageEnumeration::HasMoreElements() const
+{
+    return mpImpl->HasMoreElements();
+}
+
+SharedPageDescriptor PageEnumeration::GetNextElement()
+{
+    return mpImpl->GetNextElement();
+}
+
+void PageEnumeration::Rewind()
+{
+    return mpImpl->Rewind();
+}
+
+} // end of namespace ::sd::slidesorter::model
+
+namespace {
+
+PageEnumerationImpl::PageEnumerationImpl (
+    const SlideSorterModel& rModel,
+    const PageEnumeration::PagePredicate& rPredicate)
+    : mrModel(rModel),
+      maPredicate(rPredicate),
+      mnIndex(0)
+{
+    Rewind();
+}
+
+PageEnumerationImpl::PageEnumerationImpl (
+    const SlideSorterModel& rModel,
+    const PageEnumeration::PagePredicate& rPredicate,
+    int nIndex)
+    : mrModel(rModel),
+      maPredicate(rPredicate),
+      mnIndex(nIndex)
+{
+}
+
+::std::unique_ptr<Enumeration<SharedPageDescriptor> >
+    PageEnumerationImpl::Clone()
+{
+    return ::std::unique_ptr<Enumeration<SharedPageDescriptor> >(
+        new PageEnumerationImpl(mrModel,maPredicate,mnIndex));
+}
+
+bool PageEnumerationImpl::HasMoreElements() const
+{
+    return (mnIndex < mrModel.GetPageCount());
+}
+
+SharedPageDescriptor PageEnumerationImpl::GetNextElement()
+{
+    SharedPageDescriptor pDescriptor (mrModel.GetPageDescriptor(mnIndex));
+
+    // Go to the following valid element.
+    mnIndex += 1;
+    AdvanceToNextValidElement();
+
+    return pDescriptor;
+}
+
+void PageEnumerationImpl::Rewind()
+{
+    // Go to first valid element.
+    mnIndex = 0;
+    AdvanceToNextValidElement();
+}
+
+void PageEnumerationImpl::AdvanceToNextValidElement()
+{
+    while (mnIndex < mrModel.GetPageCount())
+    {
+        SharedPageDescriptor pDescriptor (mrModel.GetPageDescriptor(mnIndex));
+
+        // Test for the predicate being fulfilled.
+        if (pDescriptor && maPredicate(pDescriptor))
+        {
+            // This predicate is valid.
+            break;
+        }
+        else
+        {
+            // Advance to next predicate.
+            mnIndex += 1;
+        }
+    }
+}
+
+} // end of anonymous namespace
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */