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//===========================================
// Lumina-DE source code
// Copyright (c) 2016, Ken Moore
// Available under the 3-clause BSD license
// See the LICENSE file for full details
//===========================================
// This is a simple widget for viewing a QImage and allowing the user to
// highlight/select portions of the image with possible actions on the selection
//===========================================
#ifndef _LUMINA_SCREENSHOT_IMAGE_EDITOR_H
#define _LUMINA_SCREENSHOT_IMAGE_EDITOR_H
#include <QImage>
#include <QWidget>
#include <QRect>
#include <QMouseEvent>
#include <QPaintEvent>
#include <QMenu>
class ImageEditor : public QWidget{
Q_OBJECT
public:
ImageEditor(QWidget*parent = 0);
~ImageEditor();
void LoadImage(QImage img);
void setDefaultSize(QSize sz);
bool hasSelection();
QImage image();
private:
QImage fullIMG, scaledIMG; //Note: the aspect ratio between the two images must be preserved!!
QSize defaultSize; //for loading new images
QRect selRect; //selection rectangle (scaledIMG coordinates)
QPoint selPoint; //initial selection point (used during click/drags)
QMenu *contextMenu;
//simplification functions
qreal getScaleFactor(){
//return the scale factor between the full/scaled images
return ( ( (qreal) scaledIMG.height()) / ( (qreal) fullIMG.height()) );
}
void rescaleImage(qreal scfactor){
if(fullIMG.isNull()){ return; }
scaledIMG = fullIMG.scaled( fullIMG.width()*scfactor, fullIMG.height()*scfactor, Qt::KeepAspectRatio,Qt::SmoothTransformation);
selRect = QRect();
emit selectionChanged(false);
this->update(); //trigger a repaint event
}
private slots:
void showMenu();
public slots:
void scaleUp(int val = 10); //10% change by default
void scaleDown(int val = 10); //10% change by default
void cropImage();
void resizeImage();
protected:
void mousePressEvent(QMouseEvent *ev);
void mouseMoveEvent(QMouseEvent *ev);
void mouseReleaseEvent(QMouseEvent *);
void paintEvent(QPaintEvent*);
signals:
void selectionChanged(bool); //true if there is a selection
};
#endif
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