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Qt-interest Archive, April 2007
How to get non-latin characters via the keyevents.

Message 1 in thread

Hi all,

I have some code that implements a key event handler directly (by subclassing 
a widget and implementing the protected methods).
What I have been noticing is that the normal compose concept I used in other 
Qt widgets doesn't work.
For example; I hit [compose] ["] [a] and I get ä in a lineEdit, but I get "a 
in my own widget.
I see events come in, one for the compose (which I ignore), one for the shift 
(also ignored) and then one for the ", and last one for the a.

Is there a trick to get one event with the composited character? And how would 
I have to handle other input methods?

I tried on Qt43-beta and 4.2.2

Any help would be appreciated, thanks!
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Message 2 in thread

On Sunday 01 April 2007 11:30:12 Thomas Zander wrote:
> Hi all,
>
> I have some code that implements a key event handler directly (by
> subclassing a widget and implementing the protected methods).
> What I have been noticing is that the normal compose concept I used in
> other Qt widgets doesn't work.
> For example; I hit [compose] ["] [a] and I get ä in a lineEdit, but I get
> "a in my own widget.
> I see events come in, one for the compose (which I ignore), one for the
> shift (also ignored) and then one for the ", and last one for the a.
>
> Is there a trick to get one event with the composited character? And how
> would I have to handle other input methods?

On X11 we receive those composited characters on the input method level from 
the X server. We could try to detect this special case and send a QKeyEvent 
instead, but we currently just send the resulting string to the widget with a 
QInputMethodEvent.

So in order to receive these characters and input method data in general (on 
all platforms) you have to implement input method support in your widget, 
which includes setting the Qt::WA_InputMethodEnabled window attribute on your 
widget, handling QWidget::inputMethodQuery and QWidget::inputMethodEvent as 
well as calling QWidget::updateMicroFocus.


Simon

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