Qt事件——鼠标事件

通过label来显示各种事件
鼠标按下事件

//按下显示坐标
void MyLabel::mousePressEvent(QMouseEvent * ev)
{
int i = ev->x();
int j = ev->y();

//判断按下的鼠标键位
if (ev->button() == Qt::LeftButton) {
qDebug() << "LeftButton";
}
else if (ev->button() == Qt::RightButton) {
qDebug() << "RightButton";
}
else if (ev->button() == Qt::MidButton)
{
qDebug() << "MidButton";
}

QString text = QString("<center><h1>Mouse Press:(%1,%2)</center></h1>").arg(i).arg(j);
this->setText(text);
}

鼠标抬起事件

//鼠标抬起
void MyLabel::mouseReleaseEvent(QMouseEvent* ev)
{
QString text = QString("<center><h1>Mouse Release:(%1,%2)</center></h1>").arg(ev->x()).arg(ev->y());
this->setText(text);
}

鼠标移动事件

//鼠标移动，不设置this->setMouseTracking(true);需要按下后移动才有效
void MyLabel::mouseMoveEvent(QMouseEvent* ev)
{
QString text = QString("<center><h1>Mouse Move:(%1,%2)</center></h1>").arg(ev->x()).arg(ev->y());
this->setText(text);
}

#include "MyLabel.h"
#include <QMouseEvent>
#include <QDebug>

MyLabel::MyLabel(QWidget *parent)
: QLabel(parent)
{
//设置默认追踪鼠标，就可以不先点击就触发移动事件
this->setMouseTracking(true);
}

MyLabel::~MyLabel()
{}

//按下显示坐标
void MyLabel::mousePressEvent(QMouseEvent * ev)
{
int i = ev->x();
int j = ev->y();

//判断按下的鼠标键位
if (ev->button() == Qt::LeftButton) {
qDebug() << "LeftButton";
}
else if (ev->button() == Qt::RightButton) {
qDebug() << "RightButton";
}
else if (ev->button() == Qt::MidButton)
{
qDebug() << "MidButton";
}

QString text = QString("<center><h1>Mouse Press:(%1,%2)</center></h1>").arg(i).arg(j);
this->setText(text);
}

//鼠标抬起
void MyLabel::mouseReleaseEvent(QMouseEvent* ev)
{
QString text = QString("<center><h1>Mouse Release:(%1,%2)</center></h1>").arg(ev->x()).arg(ev->y());
this->setText(text);
}

//鼠标移动，不设置this->setMouseTracking(true);需要按下后移动才有效
void MyLabel::mouseMoveEvent(QMouseEvent* ev)
{
QString text = QString("<center><h1>Mouse Move:(%1,%2)</center></h1>").arg(ev->x()).arg(ev->y());
this->setText(text);
}

原文地址：https://blog.csdn.net/weixin_74239923/article/details/142882770

免责声明：本站文章内容转载自网络资源，如本站内容侵犯了原著者的合法权益，可联系本站删除。更多内容请关注自学内容网（zxcms.com）！