justhomework/SoftwareDesign/Code/2-3-4/mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow) {
  ui->setupUi(this);
  ui->centralwidget->setMouseTracking(true);
  setMouseTracking(true);
}

MainWindow::~MainWindow() { delete ui; }

void MainWindow::mousePressEvent(QMouseEvent *e) {
  if (e->button() == Qt::LeftButton)
    ui->l1->setText("Left button press");
  else
    ui->l1->setText("Right button press");
}
void MainWindow::mouseReleaseEvent(QMouseEvent *e) {
  if (e->button() == Qt::LeftButton)
    ui->l1->setText("Left button release");
  else
    ui->l1->setText("Right button release");
}
void MainWindow::mouseDoubleClickEvent(QMouseEvent *e) {
  if (e->button() == Qt::LeftButton)
    ui->l1->setText("Left button double click");
  else
    ui->l1->setText("Right button double click");
}
void MainWindow::mouseMoveEvent(QMouseEvent *e) {
  QPoint pos = e->globalPos();
  ui->l2->setText(QString("(%1,%2)").arg(pos.rx()).arg(pos.ry()));
}
void MainWindow::wheelEvent(QWheelEvent *e) {
  if (e->delta() > 0)
    ui->l1->setText("scroll up");
  else
    ui->l1->setText("scroll down");
}