[Lazarus] Handle user inputs

[xrfang]

Hi,

I want to use TApplicationProperties.OnUserInput to process keyboard/mouse events.  But the parameter of this method is a Cardinal.   My questions are:

1) How do I know its event type, such as keydown/keyup/keypress or mouse move etc？

2) How do I know the actual key that is pressed, or the X, Y coordinates of the mouse?

Thanks,
Shannon
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