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/***************************************************************************
ImageView.h - simple widget class for displaying a QImage
-------------------
begin : 1999
copyright : (C) 1999 by Martin Wilz
email : Martin Wilz <mwilz@ernie.mi.uni-koeln.de>
***************************************************************************/
/***************************************************************************
* *
* This program 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. *
* *
***************************************************************************/
#ifndef IMAGEVIEW_H
#define IMAGEVIEW_H
#include "config.h"
#include "libkwavegui_export.h"
#include <QtGlobal>
#include <QImage>
#include <QPainter>
#include <QWidget>
namespace Kwave
{
/**
* Simple widget class for displaying a QImage.
*/
class LIBKWAVEGUI_EXPORT ImageView: public QWidget
{
Q_OBJECT
public:
/**
* Constructor.
* @param parent pointer to the parent widget, can be 0
* @param fit_width if set to true, the image will be scaled to fit
* horizontally into the widget; if false the image will be
* cut off at the edge and should be scrolled
* @param fit_height if set to true, the image will be scaled to fit
* vertically into the widget; if false the image will be
* cut off at the edge and should be scrolled
*/
explicit ImageView(QWidget *parent = nullptr,
bool fit_width = true,
bool fit_height = true);
/**
* Destructor
*/
~ImageView() override;
/**
* Returns the position and size of the current image, packed
* into a QRect object.
* @return rectangle with the image coordinates and size
*/
QRect imageRect();
public slots:
/**
* Sets a new QImage for displaying.
* @param image a pointer to the image
*/
void setImage(QImage image);
/** sets a new horizontal offset, useful for scrolling */
void setHorizOffset(int offset);
/** sets a new vertical offset, useful for scrolling */
void setVertOffset(int offset);
signals:
void viewInfo(int, int, int);
void sigCursorPos(const QPoint pos);
protected:
void mouseMoveEvent(QMouseEvent *e) override;
void mousePressEvent(QMouseEvent *e) override;
void paintEvent(QPaintEvent *) override;
private:
/**
* offset of the image, in original unscaled coordinates
* of the internal QImage
*/
QPoint m_offset;
/**
* last displayed image rectangle. Note that the left and
* top coordinates are unscaled, but the width and height
* might be scaled to screen coordinates!
*/
QRect m_last_rect;
/** pointer to the QImage to be displayed */
QImage m_image;
/** if true, scale to fit horizontally */
bool m_fit_width;
/** if true, scale to fit vertically */
bool m_fit_height;
/**
* scale factor in horizontal direction, will be
* (width of the image / width of the widget) if m_fit_width
* is true, or 1.0 else
*/
double m_scale_x;
/**
* scale factor in vertical direction, will be
* (height of the image / height of the widget) if m_fit_height
* is true, or 1.0 else
*/
double m_scale_y;
};
}
#endif // _IMAGEVIEW_H_
//***************************************************************************
//***************************************************************************
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