#include <QtGui>#include "mainwindow.h"#include "drawarea.h"MainWindow::MainWindow(){    scribbleArea = new DrawArea;    setCentralWidget(scribbleArea);    setWindowTitle(tr("鼠標(biāo)與定時(shí)器事件"));    resize(480, 320);		timeId = 0;}void MainWindow::closeEvent(QCloseEvent *event){    if (maybeSave()) {        event->accept();    } else {        event->ignore();    }}bool MainWindow::maybeSave(){    if (scribbleArea->isModified()) 			return true;		else			return false;}void MainWindow::showEvent(QShowEvent* event){	timeId = startTimer(10000);}void MainWindow::hideEvent(QHideEvent* event){	killTimer(timeId);}void MainWindow::timerEvent(QTimerEvent* event){	if(event->timerId() == timeId)		scribbleArea->clearImage();}