Digital Artifex
86 lines
1.6 KiB
C++
86 lines
1.6 KiB
C++
#ifndef PAGINATOR_H
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#define PAGINATOR_H
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#include <QObject>
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#include "komplex_global.h"
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#include "slidingcachecontroller.h"
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template<typename T>
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class KOMPLEX_EXPORT Paginator
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{
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public:
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Paginator() = default;
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~Paginator() = default;
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auto next() const -> void
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{
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setOffset(m_offset + m_resultsPerPage);
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}
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auto previous() const -> void
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{
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setOffset(m_offset - m_resultsPerPage);
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}
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auto resultsPerPage() const -> qsizetype
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{
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return m_resultsPerPage;
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}
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auto setResultsPerPage(qsizetype resultsPerPage) -> void
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{
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m_resultsPerPage = resultsPerPage;
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m_data = m_cacheController.chunk(m_offset, m_resultsPerPage);
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}
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auto data() const -> QList<T*>
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{
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return m_data;
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}
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auto count() const -> qsizetype
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{
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return m_data.count();
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}
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auto at(qsizetype index) const -> T*
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{
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if(index < 0 || index >= m_data.count())
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{
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return nullptr;
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}
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return m_data.at(index);
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}
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auto controller() -> SlidingCacheController<T>*
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{
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return &m_cacheController;
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}
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auto offset() const -> qsizetype
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{
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return m_offset;
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}
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auto setOffset(qsizetype offset) -> void
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{
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m_offset = offset;
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if(m_offset < 0 || m_offset == std::numeric_limits<qsizetype>::max())
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m_offset = 0;
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m_data = m_cacheController.chunk(m_offset, m_resultsPerPage);
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}
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private:
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qsizetype m_offset = 0;
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qsizetype m_resultsPerPage = 0;
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SlidingCacheController<T> m_cacheController;
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QList<T*> m_data;
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};
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#endif // PAGINATOR_H
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