Qlineedit set input mask

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QLineEdit It's a single line text editor , It is often used for text input in the interface .QLineEdit Provides inputMask Use some specific characters to set the format and content of the input .

inputMask

①． summary

The input mask consists of two parts ：; Before that is the input format and placeholder settings ,; Then there is the blank placeholder setting .

②． Format is set

A： Only letters can be entered , And don't omit 
a： Only letters can be entered , It can be omitted 
N： Input only   Letters and numbers , And don't omit 
n： Input only   Letters and numbers , It can be omitted 
X： You can enter any character , And don't omit 
x： You can enter any character , It can be omitted 
9： You can enter numbers , And don't omit 
0： You can enter numbers , It can be omitted 
D： You can enter numbers  1 ~ 9, And don't omit 
d： You can enter numbers  1 ~ 9, It can be omitted 
#： You can enter numbers and   Plus minus ：+ ,-, It can be omitted 
H： You can enter  16  Hexadecimal characters , And don't omit 
h： You can enter  16  Hexadecimal characters , It can be omitted 
B： You can enter  2  Hexadecimal characters , And don't omit 
b： You can enter  2  Hexadecimal characters , It can be omitted 
>： All letters are capitalized 
<： All letters to lowercase 
!： Stop case conversion 
\： The above to special characters are displayed as normal characters 

When you have to input characters before you have finished typing , Enter press signal returnPressed No response .

③． Blank placeholder setting

A blank placeholder is what the placeholder displays when no content has been entered , The default is blank , Automatically delete after user input .

Application, for example,

ui.lineEdit->setInputMask(" Find the target 99;_");// Formatting text 
ui.lineEdit_2->setInputMask("000.000.000.000;_");//IP Address input 
ui.lineEdit_3->setInputMask("0000-00-00;_");// Date input