Onscreen Keyboard in Qt 5

Question

I want to create a onscreen keyboard for a desktop application. The application will be built in Qt 5. I have couple of questions, please clarify them.

1. What

Answer 1

I understand there are two challenges you would have:

1. Getting notified as to when to show/hide the on-screen keyboard, based on the focus being on text widgets
2. How to post key-press event to the text widgets

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ANSWER

1. As for the former, you could use QObject::InstallEventFilter() on widgets that you want to provide the keyboard service to. You can then look for the mouseReleaseEvent along the lines of the Qt code in the link.
2. This can be achieved by using QCoreApplication::postEvent()

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As for QPlatformInputContext, get the example of a Qt Virtual Keyboard here.