Friday, June 24, 2011

QT keyboard events

I am here to make a quick post. I searched for this at many places but could not get the exact solutions. Every message I could read sounded cryptic.

Scenario:
I want to generate fake keyboard events and send to QWebView class.

Solution:
Extend this class to have slots for signals. Connect it to a signal that can pass an ascii character.

Issue:
Keyboard does not have 'a' and 'A'. It only has an 'A'. That means, I cannot directly send any lower case characters using the event (Which is not correct)

Solution:
The solution is simple. The constructor of QKeyEvent can take QString as one of its argument. The signature is as follows:

QKeyEvent ( Type type, int key, Qt::KeyboardModifiers modifiers, const QString & text = QString(), bool autorep = false, ushort count = 1 )





Even if we don't pass the QString, it will work. However, by passing the QString, we can control exactly what will be displayed.
This is how I create my QKeyEvent:


void MyWebView::rcvKeys(int k)
{

char str[2];
str[0]=k;
str[1]='\0';

QKeyEvent *k=new QKeyEvent(QEvent::KeyPress,k,Qt::NoModifier,QtString(str),false,0)

//-----------Pass it to postevent etc
}
}

1 comment:

freakz867 said...

Big thanks! Your solution for lowercase chars was really helpful.