#include "scrolldisplay.h"

ScrollDisplay::ScrollDisplay(QWidget *parent, const char *name, WFlags flags):QScrollView(parent,name,flags) {
	paint_area=new PaintArea(this);
	connect(paint_area,SIGNAL(draggedBy(int,int)),this,SLOT(scrollBy(int,int)));
	setGeometry(0,0,width(),height());
	addChild(paint_area);
	paint_area->repaint();
}

ScrollDisplay::~ScrollDisplay() {
	delete paint_area;
}

PaintArea::PaintArea(QWidget *parent, const char *name, WFlags flags):QWidget(parent,name,flags) {
	dragging=false;
	pm=new QPixmap(0,0);
	resize(pm->width(),pm->height());
}

PaintArea::~PaintArea() {
	delete pm;
}

void PaintArea::paintEvent(QPaintEvent *e) {
	bitBlt(this,0,0,pm);
	e=NULL;
}

void PaintArea::setImage(QImage &im) {
	pm->convertFromImage(im);
	resize(pm->width(),pm->height());
	repaint();
}

bool PaintArea::load(QString filename) {
	bool b=pm->load(filename);
	if (b) {
		resize(pm->width(),pm->height());
		repaint();
	}
	return(b);
}

bool PaintArea::save(QString filename, const char *format) {
	return(pm->save(filename,format));
}

void PaintArea::mousePressEvent(QMouseEvent *e) {
	dragging=true;
	sx=e->globalX();
	sy=e->globalY();
	emit(pressed(e));
}

void PaintArea::mouseMoveEvent(QMouseEvent *e) {
	if (dragging) {
		int dx=sx-e->globalX(), dy=e->globalY()-sy;
		sx=e->globalX();
		sy=e->globalY();
		emit(draggedBy(dx,-dy));
	}
}

void PaintArea::mouseReleaseEvent(QMouseEvent *e) {
	dragging=false;
	e->accept();
}