覆盖对话框类中的虚函数“virtual void closeEvent(QCloseEvent * e)”。代码评论将详细解释。
Dialog::Dialog(QWidget *parent) :QDialog(parent), ui(new Ui::Dialog){
ui->setupUi(this);
}
Dialog::~Dialog(){
delete ui;
}
//SLOT
void Dialog::fnShow(){
//Show the dialog
this->show();
}
void Dialog::closeEvent(QCloseEvent *e){
QMessageBox::StandardButton resBtn = QMessageBox::question(this, "APP_NAME",
tr("Are you sure?\n"),
QMessageBox::Cancel | QMessageBox::No | QMessageBox::Yes,
QMessageBox::Yes);
if (resBtn != QMessageBox::Yes){
//Hiding the dialog when the close button clicked
this->hide();
//event ignored
e->ignore();
//Testing. To show the dialog again after 2 seconds
QTimer *qtimer = new QTimer(this);
qtimer->singleShot(2000,this,SLOT(fnShow()));
qtimer->deleteLater();
}
//below code is for understanding
//as by default it is e->accept();
else{
//close forever
e->accept();
}
}
当您关闭对话框时,应用程序的任何其他窗口是否可见? – peppe