笔记：QT的模态对话框、非模态对话框及QLineEdit的验证器和补全器

1.调用模态对话框

(1)调用dialog->exec()方法；

1 QDialog dialog;
dialog.exec();
3 int x = 4+5;//dialog窗口关闭后才会执行

(2)dialog->setModal(true);

dialog->show();

QDialog *dialog = new QDialog(this);
dialog->setModal(true);
dialog->show();
int x = 4+5;//不用等dialog关闭，执行完dialog->show()马上执行
...
delete dialog;

2.调用非模态对话框

(1)dialog->show();

3.如何在关闭窗口同时销毁窗口

只有当剩下最后一个主界面时调用close()时程序才会退出，其他情况下界面只是隐藏，要想close()的同时销毁窗口，调用dialog->setAttribute(Qt::WA_DeleteOnClose, true);

4.setWindowModality(Qt::WindowModality windowModality)

Qt::NonModal：非模态；

Qt::WindowModal：阻塞父窗口和所有祖先窗口及它们的子窗口；

Qt::ApplicationModal：阻塞整个应用程序。

5.QLineEdit的验证器

QLineEdit edit;
QValidator *validator = new QIntValidator(10, 100, &edit);
edit.setValidator(validator);

6.QLineEdit的补全器

QLineEdit edit;
QStringList words;
words << "Hello" << "World" << "欢迎";
QCompleter *completer = new QCompleter(words, &edit);
completer->setCaseSensitivity(Qt::CaseInsensitive);
edit.setCompleter(completer);