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Diffstat (limited to 'sd/source/ui/slidesorter/model/SlsPageEnumeration.cxx')
-rw-r--r-- | sd/source/ui/slidesorter/model/SlsPageEnumeration.cxx | 202 |
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 0000000000..a0a3db221d --- /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, + PageEnumeration::PagePredicate aPredicate); + 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, + PageEnumeration::PagePredicate aPredicate, + 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, + PageEnumeration::PagePredicate aPredicate) + : mrModel(rModel), + maPredicate(std::move(aPredicate)), + mnIndex(0) +{ + Rewind(); +} + +PageEnumerationImpl::PageEnumerationImpl ( + const SlideSorterModel& rModel, + PageEnumeration::PagePredicate aPredicate, + int nIndex) + : mrModel(rModel), + maPredicate(std::move(aPredicate)), + 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: */ |