Qt-事件处理-鼠标事件

.h
#ifndef MOUSEEVENT_H
#define MOUSEEVENT_H
#include <QMainWindow>
#include <QLabel>
#include <QStatusBar>
#include <QMouseEvent>
class MouseEvent : public QMainWindow
{
    Q_OBJECT
public:
    MouseEvent(QWidget *parent = 0);
    ~MouseEvent();
protected:
    void mousePressEvent(QMouseEvent *e);
    void mouseMoveEvent(QMouseEvent *e);
    void mouseReleaseEvent(QMouseEvent *e);
    void mouseDoubleClickEvent(QMouseEvent *e);
private:
    QLabel *statusLabel;
    QLabel *MousePosLabel;
};
#endif // MOUSEEVENT_H

.cpp
#include "mouseevent.h"
MouseEvent::MouseEvent(QWidget *parent)
    : QMainWindow(parent)
{
    setWindowTitle(tr("鼠标事件"));
    statusLabel = new QLabel;
    statusLabel->setText(tr("当前位置"));
    statusLabel->setFixedWidth(100);
    MousePosLabel = new QLabel;
    MousePosLabel->setText(tr(""));
    MousePosLabel->setFixedWidth(100);
    statusBar()->addPermanentWidget(statusLabel);
    statusBar()->addPermanentWidget(MousePosLabel);
    this->setMouseTracking(true);
    resize(400,200);
}
void MouseEvent::mousePressEvent(QMouseEvent *e)
{
    QString str="("+QString::number(e->x())+","+QString::number(e->y()) +")";
    if(e->button()==Qt::LeftButton)
    {
        statusBar()->showMessage(tr("左键")+str);
    }
    else if(e->button()==Qt::RightButton)
    {
        statusBar()->showMessage(tr("右键")+str);
    }
    else if(e->button()==Qt::MidButton)
    {
        statusBar()->showMessage(tr("中键")+str);
    }
}
void MouseEvent::mouseMoveEvent(QMouseEvent *e)
{
    MousePosLabel->setText("("+QString::number(e->x())+","+QString::number(e->y())+")");
}
void MouseEvent::mouseReleaseEvent(QMouseEvent *e)
{
    QString str="("+QString::number(e->x())+","+QString::number(e->y()) +")";
    statusBar()->showMessage(tr("释放在：")+str,3000);
}
void MouseEvent::mouseDoubleClickEvent(QMouseEvent *e){}
MouseEvent::~MouseEvent()
{
}