外部初始化对话框指针OpenAllDlg* openAllDlg =NULL
建立对话框槽函数
void QtMainScanUi::openAll()
{
if(openAllDlg == NULL ) //只建立一个窗口,建立后不能在建窗口
{
openAllDlg = new OpenAllDlg(); //不指定父窗口,用show()显示
openAllDlg->setAttribute(Qt::WA_DeleteOnClose); //关闭时自动删除
openAllDlg->setWindowTitle("基于QWidget的窗体,无父窗口,关闭时删除");
openAllDlg->setWindowFlag(Qt::Window, true);
openAllDlg->setWindowOpacity(1);
//openAllDlg->setWindowModality(Qt::ApplicationModal);
openAllDlg->setWindowModality(Qt::WindowModal);
openAllDlg->show(); //在单独的窗口中显示
}
}
但是发现子窗口关闭后,openAllDlg != NULL ,所以关掉窗口没法再建立窗口。目的是只有一个窗口,这么让窗口关闭时openAllDlg = NULL?