MacOS: after FocusInEvent a second mouse press is required to receive ButtonPressEvent

[hzwar]

This behaviour is standard on MacOS but for VSTs and AUs the most common behaviour (incl. Logic) is to allow for this use case:

• DAW window or some other plugin window has focus
• User hovers over plugin controls and sees hover state related indications - this works i.e. MotionEvent received
• User presses mouse on a knob in a Pugl plugin window (ButtonPressEvent) and can immediately drag it (MotionEvents). The first part doesn't work, the ButtonPressEvent is not received. User needs to release mouse button and press it again.

Tried a workaround via FocusInEvent which is received but this lacks information like position and button. But even if that information would be avialble the workaround would not work because MotionEvent(s) don't come through until mouse button release/press.

[drobilla]

Presumably you can figure out how those VSTs and AUs do it. My guess is grabbing focus...

I don't really care about this to be honest, so I won't be looking into it myself, but I'd be happy to include any reasonable changes necessary to make workaround possible.

[falkTX]

I think this is just a flag on the NSView component, saying that it "accepts first click".

https://stackoverflow.com/questions/19554185/how-to-make-a-nsview-get-focus-first-responder-immediately-to-accept-a-mousedown

I didnt try this myself though, but looks to be the thing needed here

[drobilla]

Oh, I vaguely remember seeing those words somewhere. Seems easy enough.