可对文本进行拖动到指定位置。
部分主要代码
- 当被鼠标拖动的对象进入其容器范围内时触发此事件
void DragWidget::dragEnterEvent(QDragEnterEvent *event)
{if (event->mimeData()->hasText()) {if (event->source() == this) {event->setDropAction(Qt::MoveAction);
event->accept(); /* 接受拖拽事件 */} else {event->acceptProposedAction();
}
} else {event->ignore();
}
}
在一个拖动过程中,释放鼠标键时触发此事件
void DragWidget::dropEvent(QDropEvent *event)
{if (event->mimeData()->hasText()) {const QMimeData *mime = event->mimeData();
QStringList pieces = mime->text().split(QRegularExpression(QStringLiteral("\\s+")),
QString::SkipEmptyParts);
QPoint position = event->pos();
QPoint hotSpot;
QByteArrayList hotSpotPos = mime->data(hotSpotMimeDataKey()).split(' ');
if (hotSpotPos.size() == 2) {
/* 松开拖拽设置为当前位置 */
hotSpot.setX(hotSpotPos.first().toInt());
hotSpot.setY(hotSpotPos.last().toInt());
}
for (const QString &piece : pieces) {QLabel *newLabel = createDragLabel(piece, this);
newLabel->move(position - hotSpot);
newLabel->show();
newLabel->setAttribute(Qt::WA_DeleteOnClose);
position += QPoint(newLabel->width(), 0);
}
if (event->source() == this) {event->setDropAction(Qt::MoveAction);
event->accept(); /* 接受拖拽事件 */} else {event->acceptProposedAction();
}
} else {event->ignore();
}
for (QWidget *widget : findChildren<QWidget *>()) {if (!widget->isVisible())
widget->deleteLater();}
}
- 捕获鼠标按下事件
void DragWidget::mousePressEvent(QMouseEvent *event)
{QLabel *child = qobject_cast<QLabel*>(childAt(event->pos()));
if (!child)
return;
QPoint hotSpot = event->pos() - child->pos();
QMimeData *mimeData = new QMimeData;
mimeData->setText(child->text());
mimeData->setData(hotSpotMimeDataKey(),
QByteArray::number(hotSpot.x()) + ' ' + QByteArray::number(hotSpot.y()));
qreal dpr = window()->windowHandle()->devicePixelRatio();
QPixmap pixmap(child->size() * dpr);
pixmap.setDevicePixelRatio(dpr);
child->render(&pixmap);
QDrag *drag = new QDrag(this);
drag->setMimeData(mimeData);
drag->setPixmap(pixmap);
drag->setHotSpot(hotSpot);
Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);
if (dropAction == Qt::MoveAction)
child->close();}
关于更多
- 在 QtCreator 软件 可以找到:
- 或在以下 Qt 安装目录 找到
C:\Qt\{你的 Qt 版本}\Examples\{你的 Qt 版本}\widgets\draganddrop\draggabletext
- 相关链接
https://doc.qt.io/qt-5/qtwidgets-draganddrop-draggabletext-example.html
- Qt 君公众号后台回复『Qt 示例』获取更多内容。