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https://github.com/YACReader/yacreader
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80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
#ifndef CONTINUOUS_VIEW_MODEL_H
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#define CONTINUOUS_VIEW_MODEL_H
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#include <QObject>
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#include <QSize>
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#include <QVector>
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class ContinuousViewModel : public QObject
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{
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Q_OBJECT
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public:
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explicit ContinuousViewModel(QObject *parent = nullptr);
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void reset();
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void setNumPages(int count);
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void setZoomFactor(int zoom);
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void setViewportSize(int width, int height);
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void setScrollYFromUser(int scrollY);
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void setAnchorPage(int page);
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void setCurrentPage(int page);
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void setPageNaturalSize(int pageIndex, const QSize &size);
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int numPages() const;
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int totalHeight() const;
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int scrollY() const;
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int viewportHeight() const;
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int zoomFactor() const;
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int centerPage() const;
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int yPositionForPage(int pageIndex) const;
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int pageAtY(int y) const;
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QSize scaledPageSize(int pageIndex) const;
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signals:
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void stateChanged();
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private:
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struct LayoutSnapshot {
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QVector<int> yPositions;
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QVector<QSize> scaledSizes;
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int totalHeight = 0;
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};
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struct ViewportAnchor {
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int pageIndex = -1;
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float offsetRatio = 0.0f;
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bool valid = false;
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};
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enum class RecomputePolicy {
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PreserveViewportAnchor,
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PreserveScrollClamped,
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ScrollToPageTop
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};
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void recompute(RecomputePolicy policy, int targetPage = -1);
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LayoutSnapshot buildLayoutSnapshot(int width) const;
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ViewportAnchor anchorFromViewport(const LayoutSnapshot &snapshot, int scrollY, int viewportHeight) const;
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int resolveAnchorToScrollY(const LayoutSnapshot &snapshot, const ViewportAnchor &anchor, int viewportHeight) const;
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int pageAtY(const LayoutSnapshot &snapshot, int y) const;
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int maxScrollFor(const LayoutSnapshot &snapshot) const;
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QSize scaledPageSizeForWidth(int pageIndex, int width) const;
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float scaleForPage(int pageIndex, int width) const;
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int numPagesValue = 0;
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QVector<QSize> pageSizes;
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QSize defaultPageSize { 800, 1200 };
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int zoomFactorValue = 100;
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int viewportWidth = 0;
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int viewportHeightValue = 0;
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int scrollYValue = 0;
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int anchorPage = -1;
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LayoutSnapshot layoutSnapshot;
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};
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#endif // CONTINUOUS_VIEW_MODEL_H
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