kcanvaspreview.h

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/*
 *
 *  SPDX-FileCopyrightText: 2009 Edward Apap <schumifer@hotmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#ifndef KCANVASPREVIEW_H
#define KCANVASPREVIEW_H
 
#include <QWidget>
 
class KCanvasPreview : public QWidget
{
    Q_OBJECT
 
public:
    KCanvasPreview(QWidget * parent = 0);
 
    ~KCanvasPreview() override;
 
    void paintEvent(QPaintEvent *) override;
    void mousePressEvent(QMouseEvent *event) override;
    void mouseReleaseEvent(QMouseEvent *) override;
    void mouseMoveEvent(QMouseEvent *event) override;
 
    void setImageSize(qint32 w, qint32 h);
    void setCanvasSize(qint32 w, qint32 h);
    void setImageOffset(qint32 x, qint32 y);
 
    bool xOffsetLocked() const;
    bool yOffsetLocked() const;
 
public Q_SLOTS:
    void setxOffsetLock(bool);
    void setyOffsetLock(bool);
 
Q_SIGNALS:
    void sigModifiedXOffset(int);
    void sigModifiedYOffset(int);
 
protected:
    bool isInRegion(QPoint point);
    double scalingFactor();
 
protected:
    qint32 m_width {0}, m_height {0};
    qint32 m_imageWidth {0}, m_imageHeight {0};
    qint32 m_xOffset {0}, m_yOffset {0};
 
    qint16 m_xCanvasOffset {0}, m_yCanvasOffset {0};
    bool m_dragging {false};
 
    QImage m_image;
    QPoint m_prevDragPoint;
 
    bool m_xOffsetLocked {false};
    bool m_yOffsetLocked {false};
};
 
 
#endif /* KCANVASPREVIEW_H */