[Development] QInputMethod woes

[Simon Hausmann]

Hi,


While it's true that show(), etc. don't have the focus object as a parameter, you do have a three ways of tracking the focus object, via QWindow and QGuiApplication's signal as well as via setFocusObject in the input context itself.


I'm missing something then, why is your virtual keyboard hidden when the focus object transitions from an element in the regular UI to an element in your virtual keyboard? Hiding is usually connected to the acceptance of the newly focused object with regards to IME enabling when issuing an IME query. Are those elements perhaps missing the handling of QInputMethodEvent, the querying kind in particular?


Simon

________________________________
From: Development <development-bounces+simon.hausmann=qt.io at qt-project.org> on behalf of Uwe Rathmann <Uwe.Rathmann at tigertal.de>
Sent: Wednesday, June 13, 2018 11:09:46 AM
To: development at qt-project.org
Subject: Re: [Development] QInputMethod woes

Hi Simon,

> But my initial guess is that this isn't an inherent design
> problem of the input method API.

Well, one problem is that the input context needs to know about the
current item, as it has to correspond with it. But QInputMethod::show/
commit/reset/update/hide do not transfer any information about the item
calling them.

In case of show() all the context can do is to assume that the item
having the active focus is the one to correspond ( what actually is not
always correct in our application ) with.

In case of all other calls the context has no chance to find out if the
caller was the item it is corresponding with - at least not, when the
active focus has moved somewhere else.

And you find various situations in QQuickWindow or the controls, where
inputMethod calls are done from items not being the corresponding one.

F.e. in  QQuickWindowPrivate::setFocusInScope/clearFocusInScope
QInputMethod::commit() gets called, whenever the focus is changing. As
this is might be wrong all our context can do is to ignore these calls in
general.

--

As we also implement our own type of controls ( in C++ ) I can work
around most of these issue with bypassing the QInputMethod API and
calling our context manually using a proprietary API, where I'm adding
the caller as parameter.

But this is obviously no option for the average Qt user.

Uwe

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