Qt,PushButton,id属性？任何方式知道点击了哪个按钮

Question

void MainWindow::addRadioToUI()
{       int button_cunter=4;
        while(!database.isEmpty())
        {       button_cunter++;

                QPushButton *one = new QPushButton("Play: "+name(get_r.getTrackId()));
                one->setIcon(QIcon(":/images/play_button.png"));
                one->setMaximumWidth(140);
                one->setFlat(true);

                QGroupBox* get_rGB = new QGroupBox("somethink"); 
                QFormLayout* layout = new QFormLayout; 
                if(button_cunter%5 == 0){
                    layout->addWidget(one);

                }

                get_rGB->setLayout(layout);
                scrollAreaWidgetContents->layout()->addWidget(get_rGB);

        }
}

我有几个自动添加的QPushButtons.有没有办法在按钮上添加"id属性或者其他",然后知道点击了哪个按钮？我对每个按钮都有不同的动作.

Answer 1

QApplication提供sender()包含哪个对象发送信号的商品.所以你可以这样做:

//slot, this could also be done in a switch
if(button[X] == QApplication::sender()){
  doX();
}else if(button[Y] == QApplication::sender()){
  doY();
}

http://doc.qt.io/qt-4.8/qobject.html#sender

Answer 2

QSignalMapper 对于这类事情来说非常好.

你可以像这样定义你的插槽:

public slots:
   void clicked(int buttonId);  // or maybe trackId

然后将一个QSignalMapper*成员添加到您的类并将其连接到该插槽:

    signalMapper = new QSignalMapper(this);
    connect(signalMapper, SIGNAL(mapped(int)),
            this,         SLOT(clicked(int)));

在addRadioToUI创建按钮后,执行:

   signalMapper.setMapping(one, button_cunter);
                             // or trackId if that's more practical

如果你需要的只是指向触发信号的对象的指针,你可以使用QOjbect::sender插槽中的静态函数来获取它的句柄.