Qt拖放功能

#include "dragwidget.h" #include "draglabel.h" #include "dragicon.h" DragWidget::DragWidget(QWidget *parent) : QFrame(parent) { setMinimumSize(250,400); setAcceptDrops(true); setFrameStyle(QFrame::StyledPanel|QFrame::Raised); DragIcon *icon_one = new DragIcon(QPixmap(":/images/sheep.png"),this); DragIcon *icon_two = new DragIcon(QPixmap(":/images/heart.png"),this); DragIcon *icon_three = new DragIcon(QPixmap(":/images/fish.png"),this); icon_one->resize(50, 50); icon_one->move(50,20); icon_two->resize(50, 50); icon_two->move(150,20); icon_three->resize(50, 50); icon_three->move(260,20); } DragWidget::~DragWidget() { } void DragWidget::dragEnterEvent(QDragEnterEvent *e) { if (e->mimeData()->hasText() || e->mimeData()->hasFormat("Drag-Icon")) { if(children().contains(e->source())) { e->setDropAction(Qt::MoveAction); e->accept(); } else e->acceptProposedAction(); } } void DragWidget::dragMoveEvent(QDragMoveEvent *e) { if (e->mimeData()->hasText() || e->mimeData()->hasFormat("Drag-Icon")) { if(children().contains(e->source())) { e->setDropAction(Qt::MoveAction); e->accept(); } else e->acceptProposedAction(); } } void DragWidget::dropEvent(QDropEvent *e) { if (e->mimeData()->hasFormat("Drag-Icon")) { QByteArray data = e->mimeData()->data("Drag-Icon"); QDataStream stream(&data,QIODevice::ReadOnly); QPixmap pix; QPoint offset; stream >> pix >> offset; DragIcon *icon = new DragIcon(pix,this); icon->move(e->pos() - offset); icon->resize(50, 50); icon->show(); if (children().contains(e->source())) { e->setDropAction(Qt::MoveAction); e->accept(); } else e->acceptProposedAction(); } else if (e->mimeData()->hasFormat("Drag-Text")) { QByteArray data = e->mimeData()->data("Drag-Text"); QDataStream stream(&data,QIODevice::ReadOnly); QString text; QPoint offset; stream >> text >> offset; DragLabel *label = new DragLabel(text,this); label->move(e->pos() - offset); label->show(); if (children().contains(e->source())) { e->setDropAction(Qt::MoveAction); e->accept(); } else e->acceptProposedAction(); } else if (e->mimeData()->hasText()) { QStringList strList = e->mimeData()->text().split(QRegExp("\\s+"),QString::SkipEmptyParts); QPoint pos = e->pos(); foreach(QString str, strList) { DragLabel *dragLabel = new DragLabel(str,this); dragLabel->move(pos); dragLabel->show(); pos += QPoint(dragLabel->width(),0); } if (children().contains(e->source())) { e->setDropAction(Qt::MoveAction); e->accept(); } else { e->acceptProposedAction(); } } else { e->ignore(); } } void DragWidget::slotChangeStyle(QString style) { QApplication::setStyle(QStyleFactory::create(style)); QApplication::setPalette(QApplication::style()->standardPalette()); }