Qt自定義圖形實現拖拽效果
阿新 • • 發佈:2020-08-28
本文例項為大家分享了Qt自定義圖形實現拖拽效果的具體程式碼,供大家參考,具體內容如下
在這裡自定義圖形是通過QPaintEvent事件繪畫的圖形,也可以通過自定義控制元件的方式新增到qt中。
首先定義類來自定義圖形,這裡通過paintEvent事件來實現(主要就是繪畫一個圖形)
void QEventView::paintEvent(QPaintEvent *event) { resize(115+m_iLen,36); QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.setPen(Qt::blue); //定義箭頭的座標 static const QPoint pointArr[7] = { QPoint(0,10),QPoint(100+m_iLen,0),QPoint(115+m_iLen,18),36),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); }
接著,主視窗程式通過mousePressEvent() mouseMoveEvent(),實現拖拽移動,
void MainWindow::mousePressEvent(QMouseEvent *event) { qDebug()<<" 1:"<<event->pos(); //獲取控制元件的物件 m_pTempWidget = childAt(event->pos()); qDebug()<<m_pTempWidget; if(!m_pTempWidget || m_pTempWidget == centralWidget()) return; //容器儲存自定義圖形指標,以及圖形的位置 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; } }
就能實現簡單的拖拽功能,效果圖如下:
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支援我們。