blame: src/imageviewwidget.h

#pragma once

#include <QWidget>

#include <QImage>

#include <QPixmap>

#include <QString>

#include <QPoint>

class ImageViewWidget : public QWidget

{

    Q_OBJECT

public:

    enum ZoomMode { FitToScreen, OriginalSize, CustomZoom };

    explicit ImageViewWidget(QWidget *parent = nullptr);

    void setImage(const QString &path);

    void zoomIn();

    void zoomOut();

    void zoomOriginal();

    void zoomFitToScreen();

signals:

    void closeRequested();

    void nextRequested();

    void previousRequested();

protected:

    void paintEvent(QPaintEvent *event) override;

    void keyPressEvent(QKeyEvent *event) override;

    void mousePressEvent(QMouseEvent *event) override;

    void mouseMoveEvent(QMouseEvent *event) override;

    void mouseReleaseEvent(QMouseEvent *event) override;

private:

    void clampOffset(int imgW, int imgH);

    QPixmap m_pixmap;

    ZoomMode m_zoomMode = FitToScreen;

    double m_zoomFactor = 1.0;

    // Panning state

    QPoint m_offset;        // current pan offset (pixels)

    bool   m_dragging = false;

    QPoint m_dragStart;

    QPoint m_offsetAtDragStart;

};