1. ʹû
doDeleteText ɾ
doInsertText 

3. ʱʹQStringListQString

漰

ע/ȡע
/ȡ

ƶǰѡһ

ɾǰ
ɾǰ
Ƶǰ

DELETE/BACKSPACE

س

 ո  ַ



ճ

ק

ģʽ

4. ģʽƶѡʱǷѡ