Thanks for posting your solution. Happy coding.

Hi, for an integer input between 0 and 100 set the mask to "009". Thats all.

But why use QLineEdit if you are only manipulating numbers ? That makes the code uselessly complicated.

QRegularExpression rx("[A-Za-z0-9]*"); QRegularExpressionalidator *v = new QRegularExpressionValidator(rx, this); ui->LE_ObjectName->setValidator(v);

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@JonB Sure. I will change the code as you said. Thank you so much.

@Tirolel If you want t do it that way you shouldn't you cast the widget to find out what type it is before you actually use it? if(qobject_cast<QLineEdit*>(pLine->widget()) != 0) ... Test for which type it is then use the correct type cast to use the actual member functions...

Hi and welcome to devnet, Looks like the keyboard layout of your Pi doesn't match the keyboard layout of your desktop computer. Which are both ?

@mrjj Thanks Mrjj :) it went perfect, you're awesome haha ;)

Thank you it worked.

@shavera Did you tried to call QWidget::Update() after modifing your whileEditing property ?

Dear @SGaist, Thanks for the reply. Actually i do not want user to change the cursor position. I got one work around. I have connected the cursor position changed signal to one slot which automatically sets the cursor position to the end. The slot first calculate the text length and then moves the cursor to the last position. So in this case even if user tries to change the cursor location, cursor automatically comes at the end and whatever the user types is appended to the end. Regards Sid

Hi, Since those are only numbers, why not use QSpinBox ?

How small are we talking about ? Note that if you mix that keyboard with Qt's input framework, you're probably going to have another problem when the keyboard's line edit gets the focus.

Dear @peniwize, I am not aware of direct entry of special symbols in QLineEdit in MAC but in WINDOWS OS we can do with the help of ALT key and the symbol code. Basically go to Character Map and select the special symbol then you will be able to see the corresponding Key code to that special character. Just hold ALT symbol and enter the code from num pad by enabling NUM LOCK. Then release the ALT key. That special symbol will automatically appear in the QLineEdit in Windows. May be something similar you can try in MAC OS too. Good luck!!

@vinothrajendran4 that said, i did find some code on the new that uses a trick. please see this sample https://www.dropbox.com/s/m6slequi83tbqg2/linedit.zip?dl=0

You need to accept the event so the parent knows that the event has been handled. Otherwise the event will go all children until someone accepts it or if none do, it will be ignored. so keyEv->accept() should do the trick.