#include <qapplication.h>#include <qdragobject.h>#include "projectview.h"ProjectView::ProjectView(QWidget *parent, const char *name)    : QListBox(parent, name){    viewport()->setAcceptDrops(true);}void ProjectView::contentsMousePressEvent(QMouseEvent *event){    if (event->button() == LeftButton)        dragPos = event->pos();    QListBox::contentsMousePressEvent(event);}void ProjectView::contentsMouseMoveEvent(QMouseEvent *event){    if (event->state() & LeftButton) {        int distance = (event->pos() - dragPos).manhattanLength();        if (distance > QApplication::startDragDistance())            startDrag();    }    QListBox::contentsMouseMoveEvent(event);}void ProjectView::startDrag(){    QString person = currentText();    if (!person.isEmpty()) {        QTextDrag *drag = new QTextDrag(person, this);        drag->setSubtype("x-person");        drag->setPixmap(QPixmap::fromMimeSource("person.png"));        drag->drag();    }}void ProjectView::contentsDragEnterEvent(QDragEnterEvent *event){    event->accept(event->provides("text/x-person"));}void ProjectView::contentsDropEvent(QDropEvent *event){    QString person;    if (QTextDrag::decode(event, person)) {        QWidget *fromWidget = event->source();        if (fromWidget && fromWidget != this                && fromWidget->inherits("ProjectView")) {            ProjectView *fromProject = (ProjectView *)fromWidget;            QListBoxItem *item =                    fromProject->findItem(person, ExactMatch);            delete item;            insertItem(person);        }    }}