imagecropdialog.h

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/*
        Copyright 2006-2026 The QElectroTech Team
        This file is part of QElectroTech.
 
        QElectroTech is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 2 of the License, or
        (at your option) any later version.
 
        QElectroTech is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.
 
        You should have received a copy of the GNU General Public License
        along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef IMAGE_CROP_DIALOG_H
#define IMAGE_CROP_DIALOG_H
 
#include <QDialog>
#include <QImage>
#include <QRect>
#include <QWidget>
 
class QMouseEvent;
class QPaintEvent;
class QPushButton;

class CropAreaWidget : public QWidget
{
        Q_OBJECT
 
        public:
                explicit CropAreaWidget(const QImage &sourceImage, const QRect &initialCropRect = QRect(), QWidget *parent = nullptr);

                QRect cropRect() const;
 
        public slots:
                void resetToFullImage();
 
        signals:
                void cropRectChanged();
 
        protected:
                void paintEvent(QPaintEvent *event) override;
                void mousePressEvent(QMouseEvent *event) override;
                void mouseMoveEvent(QMouseEvent *event) override;
                void mouseReleaseEvent(QMouseEvent *event) override;
 
        private:
                enum class DragMode { None, Move, ResizeN, ResizeS, ResizeE, ResizeW, ResizeNE, ResizeNW, ResizeSE, ResizeSW };
 
                DragMode handleAt(const QPoint &pos) const;
                void applyDrag(const QPoint &pos);
 
                QImage  m_source;
                qreal   m_displayScale = 1.0;
                QRect   m_displayImageRect;   // where the (possibly scaled) pixmap actually sits within this widget
                QRect   m_cropRect;           // in display-space, relative to m_displayImageRect's own origin
 
                DragMode m_dragMode = DragMode::None;
                QPoint   m_dragStartPos;
                QRect    m_dragStartRect;
 
                static constexpr int HANDLE_SIZE = 8;
                static constexpr int MIN_CROP_SIZE = 16;
};

class ImageCropDialog : public QDialog
{
        Q_OBJECT
 
        public:
                explicit ImageCropDialog(const QPixmap &pixmap, const QRect &existingCropRect = QRect(), QWidget *parent = nullptr);

                QRect cropRect() const;
 
        private:
                CropAreaWidget *m_cropArea;
};
 
#endif // IMAGE_CROP_DIALOG_H