ComboBox colour alpha error on Apple Silicon Logic Pro

[geliang87]

Hi JUCE folks,

I encountered a problem related to colour alpha setting only found on M1 Logic Pro. Basically I made a few ComboBox components in my plugin. I set the popup menu background colour to black with alpha 0.2 by

myLookAndFeel.setColour (PopupMenu::ColourIds::backgroundColourId, Colours::black.withAlpha (0.2f));

The ComboBox components look weird in Logic Pro on my Mac M1 computer, as shown here:

I should mention the colour with alpha looks fine in Reaper as AU plugin on Mac M1. I also tried Logic Pro on an Mac Intel computer where I found no problem.

Is it a bug with Apple Silicon Logic Pro? Or can I find some workaround with JUCE?

Thanks,
Liang

[asimilon]

I think you will need to override ComboBox::showPopUp and then use getRootMenu and then show the PopupMenu with some options that set .withParentComponent(Component*).

There are a bunch of other similar threads about this, Apple decided that popover windows will have a purple background, I think as a security measure to stop a malicious software overlaying something with 0% opacity and stealing key presses or whatever.

Adding the PopupMenus to the main window component hierarchy solves this.

[geliang87]

Thanks man. By further reading PopupMenu docs, like you said it explained how the problem occurs in withParentComponent method (PopupMenu::Options::withParentComponent).