75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
#pragma once
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#include <QGraphicsView>
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#include <QImage>
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#include <QPixmap>
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#include <Qt>
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class QLabel;
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class QGraphicsPixmapItem;
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class QGraphicsScene;
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class QMouseEvent;
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class QWheelEvent;
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// 可缩放、可平移的图片显示控件。
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class ImageView : public QGraphicsView
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{
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Q_OBJECT
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public:
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explicit ImageView(QWidget* parent = nullptr);
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~ImageView() override;
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void setImage(const QImage& image);
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void setImage(const QPixmap& pixmap);
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bool loadImage(const QString& filePath);
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void clearImage();
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bool hasImage() const;
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QImage image() const;
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// 比例以原始图片大小为基准，1.0 表示 100%。
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double zoomRatio() const;
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void setZoomRatio(double ratio);
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void zoomIn(double factor = 1.25);
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void zoomOut(double factor = 1.25);
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void resetView();
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void setZoomRange(double minimum, double maximum);
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double minimumZoomRatio() const;
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double maximumZoomRatio() const;
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// 图片未铺满视口时的停靠方向，默认居中。
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void setImageAlignment(Qt::Alignment alignment);
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Qt::Alignment imageAlignment() const;
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signals:
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void imageChanged();
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void zoomRatioChanged(double ratio);
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protected:
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void resizeEvent(QResizeEvent* event) override;
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void wheelEvent(QWheelEvent* event) override;
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void mousePressEvent(QMouseEvent* event) override;
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void mouseMoveEvent(QMouseEvent* event) override;
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void mouseReleaseEvent(QMouseEvent* event) override;
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void mouseDoubleClickEvent(QMouseEvent* event) override;
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private:
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void updateZoomLabel();
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void updateZoomRatio(double ratio, bool keepCenter);
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void repositionZoomLabel();
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QGraphicsScene* m_scene;
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QGraphicsPixmapItem* m_pixmapItem;
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QLabel* m_zoomLabel;
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QImage m_image;
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double m_zoomRatio;
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double m_minimumZoomRatio;
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double m_maximumZoomRatio;
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Qt::Alignment m_imageAlignment;
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bool m_panning;
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bool m_needsInitialFit;
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QPoint m_lastMousePosition;
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};
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