qt checbox设置不可用，快捷方式，选中，取消事件

    QGridLayout *layout = new QGridLayout;

    box =new QCheckBox();
    box->setText("复选框");

    box1 =new QCheckBox();
    box1->setText("&C复选框1");
    box1->setDisabled(true);

    layout->addWidget(box,0,0);
    layout->addWidget(box1,0,1);

    connect(box,SIGNAL(stateChanged(int)),this,SLOT(ShowLog(int)));
    connect(box1,SIGNAL(stateChanged(int)),this,SLOT(ShowLog(int)));
    ui->centralWidget->setLayout(layout);

void MainWindow::ShowLog(int state)
{
    qDebug()<<state<<" "<<box->isChecked()<<" "<<box->isTristate();
    if(state)
        box1->setEnabled(true);
    else
        box1->setEnabled(false);
}