How to disable keyboard

[garry_3peace]

Is there any possibility to disable the keyboard key globally. I am trying to make a lock screen program. And I am trying to disable the Alt, Ctrl, Esc, Tab and Backspace key. ? Thank's before...

[wysota]

You can try grabbing the keyboard and handling key events yourself.

[garry_3peace]

Thank you for your quick reply. I have heard it but I don't know how to use it. Maybe I have to read the QT Assistant. At which section should I read anyway.

[jpn]

Just write "grab" to the index-tab and choose appropriate topic.

[garry_3peace]

Hm... I have try to type "grabkeyboard" and it show one method. But this method is seem like to get focus. That's why, I don't think that's the key. Or am I wrong in reading the help? Coz the grabKeyboard() method doesn't return value, nor get parameter. So how could I handle some of the key.

Or maybe I must use QKeyEvent ??

[jpn]

Did you actually read what the function documentation says? After reading it, it doesn't make sense what you're saying.

[garry_3peace]

Ow Really...?
Well, I am very newbie in QT. Maybe there are some misunderstandings in reading the help.

Btw, I have try by doing this:

void keyPressEvent(QKeyEvent *e){
    if(e->key()==16777251){
         grabKeyboard();
    }
}

void keyPressEvent(QKeyEvent *e){
    if(e->key()==16777251){
         grabKeyboard();
    }
}

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But the effect of this code, the program become hang. Cannot be resize or anything except the close button on the top right, to close the program.

[wysota]

Did you read until that part?

This widget receives all keyboard events until releaseKeyboard() is called; other widgets get no keyboard events at all.

You don't call it when you receive a key event - you call it to prevent other widgets from receiving key events. And it also says you have to eventually release the keyboard...

[garry_3peace]

Oow... Hm.. OK.. I understand what do you mean now..

[phillip_Qt]

Is there any possibility to disable the keyboard key globally. I am trying to make a lock screen program. And I am trying to disable the Alt, Ctrl, Esc, Tab and Backspace key. ? Thank's before...

Hi
just one question, did u able to disable the keyboard? R u doing this in linux? I'm trying to find help for same (disable keyboard and mouse press event in linux using QT) , but could not find much more. Your kind reply may help me a lot.

Thanks.