本文实例为大家分享了Qt自定义图形实现拖拽效果的具体代码,供大家参考,具体内容如下
在这里自定义图形是通过QPaintEvent事件绘画的图形,也可以通过自定义控件的方式添加到qt中。
首先定义类来自定义图形,这里通过paintEvent事件来实现(主要就是绘画一个图形)
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void QEventView::paintEvent(QPaintEvent *event) { resize(115+m_iLen,36); QPainter painter( this ); painter.setRenderHint(QPainter::Antialiasing); painter.setPen(Qt::blue); //定义箭头的坐标 static const QPoint pointArr[7] = { QPoint(0,10), QPoint(100+m_iLen,10), QPoint(100+m_iLen,0), QPoint(115+m_iLen,18), QPoint(100+m_iLen,36), QPoint(100+m_iLen,26), QPoint(0,26) }; int i = 0; while (i < 7) { if (i == 6) painter.drawLine(pointArr[i],pointArr[0]); else painter.drawLine(pointArr[i],pointArr[i+1]); i++; } painter.drawText(QPoint(0,22),m_sEventName); } |
接着,主窗口程序通过mousePressEvent() mouseMoveEvent(),实现拖拽移动,
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void MainWindow::mousePressEvent(QMouseEvent *event) { qDebug()<< " 1:" <<event->pos(); //获取控件的对象 m_pTempWidget = childAt(event->pos()); qDebug()<<m_pTempWidget; if (!m_pTempWidget || m_pTempWidget == centralWidget()) return ; //容器存储自定义图形指针,以及图形的位置 QMap<QEventView*,QPoint>::iterator iter = m_mapEventPoint.begin(); while (iter != m_mapEventPoint.end()) { if (iter.key() == m_pTempWidget) { m_windowInitPoint = iter.key()->frameGeometry().topLeft(); m_StartPoint = event->pos(); break ; } ++iter; } } void MainWindow::mouseMoveEvent(QMouseEvent *event) { QMap<QEventView*,QPoint>::iterator iter = m_mapEventPoint.begin(); while (iter != m_mapEventPoint.end()) { if (iter.key() == m_pTempWidget) { QPoint distance = event->pos() - m_StartPoint; iter.key()->move(m_windowInitPoint + distance); break ; } ++iter; } } |
就能实现简单的拖拽功能,效果图如下:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/Fallinlove520/article/details/104244353