你应该好好看看qt自带的manual了,至少提问前相关class的manual要看一眼的
只要看一眼,就这几个信号我不相信你会看不明白的
Signals
void cursorPositionChanged ( int old, int new )
void editingFinished ()
void returnPressed ()
void selectionChanged ()
void textChanged ( const QString & text )
void textEdited ( const QString & text )
1 signal inherited from QWidget
1 signal inherited from QObject