QT中信号槽的自动对应

在QT中，我们一般习惯于用connect进行信号和槽的对应，但是实际上QT还提供了一种自动对应信号槽的机制。

A Dialog With Auto-Connect

Although it is easy to implement a custom slot in the dialog and connect it in the constructor, we could instead use 's auto-connection facilities to connect the OK button's clicked() signal to a slot in our subclass. uic automatically generates code in the dialog's setupUi() function to do this, so we only need to declare and implement a slot with a name that follows a standard convention:

 void on__();

Using this convention, we can define and implement a slot that responds to mouse clicks on the OK button:

 class ImageDialog : public QDialog, private Ui::ImageDialog
 {
     Q_OBJECT

 public:
     ImageDialog(QWidget *parent = 0);

 private slots:
     void on_okButton_clicked();
 };

Automatic connection of signals and slots provides both a standard naming convention and an explicit interface for widget designers to work to. By providing source code that implements a given interface, user interface designers can check that their designs actually work without having to write code themselves.