Why is setPreeditText not directly available in QML?

urgm_t

Hi,

I have been trying to use the setPreeditText function in QML to set preedit text dynamically for my virtual keyboard implementation. However, when I call setPreeditText from QML (e.g., InputContext.setPreeditText()), I receive the following error:

Property 'setPreeditText' of object QVirtualKeyboardInputContext(xxxxxxx) is not a function

Could you please clarify:

Is setPreeditText not exposed in QML?
Is there any official documentation or Qt design guideline that explicitly mentions this limitation?
If possible, could you share the recommended way to dynamically set preedit text in QML? I would greatly appreciate any suggestions.

Thank you for your time and help!

urgm_t

I found that the InputContext object in QML does not have a setPreeditText function. This method is only available in the C++ QInputMethodEvent class.
QML: https://doc.qt.io/qt-5/qml-qtquick-virtualkeyboard-inputcontext.html
C++: https://doc.qt.io/qt-5/qvirtualkeyboardinputcontext.html

Below are my remaining questions:

Is there any official documentation or Qt design guideline that explicitly mentions this limitation?
If possible, could you share the recommended way to preedit text in QML?

jeremy_k

According to the documentation, https://doc.qt.io/qt-5/qml-qtquick-virtualkeyboard-inputcontext.html#preeditText-prop:

preeditText : string

This property sets the pre-edit text.

The property isn't marked read-only, indicating that an application can assign to it.