mirror of
https://github.com/YACReader/yacreader
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87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
#ifndef CONTINUOUS_PAGE_WIDGET_H
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#define CONTINUOUS_PAGE_WIDGET_H
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#include <QWidget>
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#include <QSize>
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#include <QVector>
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#include "themable.h"
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class Render;
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class ContinuousPageWidget : public QWidget, protected Themable
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{
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Q_OBJECT
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public:
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explicit ContinuousPageWidget(QWidget *parent = nullptr);
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void setRender(Render *r);
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void setNumPages(int count);
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void setZoomFactor(int zoom);
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void probeBufferedPages();
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void reset();
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int centerPage(int scrollY, int viewportHeight) const;
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int yPositionForPage(int pageIndex) const;
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int totalHeight() const;
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bool hasHeightForWidth() const override;
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int heightForWidth(int w) const override;
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QSize sizeHint() const override;
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void setAnchorPage(int page);
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void setViewportState(int scrollY, int viewportHeight);
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signals:
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// emitted after layout recomputation when the preserved viewport anchor
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// resolves to an absolute scroll position
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void layoutScrollPositionRequested(int scrollY);
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public slots:
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void onPageAvailable(int absolutePageIndex);
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protected:
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void paintEvent(QPaintEvent *event) override;
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void resizeEvent(QResizeEvent *event) override;
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void applyTheme(const Theme &theme) override;
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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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void updateLayout();
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void updateLayoutWithAnchor();
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void relayout(bool preserveAnchor);
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LayoutSnapshot buildLayoutSnapshot(int w) const;
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int pageAtY(const LayoutSnapshot &snapshot, int y) 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(int y) const;
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QSize scaledPageSize(int pageIndex, int forWidth) const;
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float scaleForPage(int pageIndex, int forWidth) const;
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Render *render = nullptr;
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int numPages = 0;
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QVector<QSize> pageSizes;
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QVector<int> yPositions;
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int currentTotalHeight = 0;
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LayoutSnapshot layoutSnapshot;
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QSize defaultPageSize { 800, 1200 };
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int zoomFactor = 100;
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int anchorPage = -1;
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int viewportScrollY = 0;
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int currentViewportHeight = 0;
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bool hasViewportState = false;
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};
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#endif // CONTINUOUS_PAGE_WIDGET_H
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