target.cpp

利用KDE编写的程序

/* target.cpp */
#include <kapp.h>
#include <qpainter.h>
#include <qdragobject.h>
#include "target.h"

int main(int argc,char **argv)
{
    KApplication app(argc,argv,"target");
    Target target;
    target.show();
    app.setMainWidget(&target);
    return(app.exec());
}

Target::Target(QWidget *parent,const char *name)
        : QWidget(parent,name)
{
    setFixedSize(400,300);
    setAcceptDrops(TRUE);
}
void Target::dragEnterEvent(QDragEnterEvent *e)
{
    e->accept(QTextDrag::canDecode(e) ||
            QImageDrag::canDecode(e));
}
void Target::dropEvent(QDropEvent *e)
{
    QString text;
    QImage image;

    if(QTextDrag::decode(e,text)) {
        drawText(e->pos(),text);
    }
    if(QImageDrag::decode(e,image)) {
        QPainter *p = new QPainter(this);
        p->drawImage(e->pos(),image);
    }
}