Mac: Display Scaling Setting

[richmond62]

-
Coo, err, humpy-duck time.

Is there a way, inwith LC, to detect either:

the displace scaling setting, or

the height of the menu bar at the top of the desktop?

[stam]

Not sure about display scaling setting, but you can certainly compute the height of MacOS Menubar.

The question is why you would need this? Are you for example trying to zoom a stack to fill available space between menubar and the Dock?
If that is what you are trying to do, it's a 1-liner:

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set the effective rect of this stack to the working screenRect

You can calculate the height of the menubar by comparing the top of a stack by examining the difference between the rect and the effective rect of the stack, when both are set to the screenRect. This function returns the current menuBar height:

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function getMenuBarHeight
    return item 2 of the working screenRect
end getMenuBarHeight

On top of this you need to factor in the stack's titlebar height - I think this is fixed at 28 px for 'normal' stacks (I think 19 for palette titlebar).

As I mentioned in a previous thread on this, my menu bar height on a 16' MPB M2 on Sonoma with the standard resolution is 38 px, and this is different from any other number previously mentioned. OTOH, I no longer needed to know this because I can fill the space between menubar and dock with the 1-liner above...

EDITED : silly code in function replaced with 1-liner

[richmond62]

I want to make sure that a stack when opened will position itself so its top is exactly below the Mac menu bar.

Thank you very much.

[stam]

First of all allow me to improve on my previous silly script (the script above edited to reflect the below):

the bottom of the menubar / height of the menubar can be calculated as:

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item 2 of the working screenRect

However if you set the top of this stack to this, it will set the top of the content of the stack to this, not the titlebar, so the titlebar is hidden. I believe the titlebar height is fixed at 28 px for 'normal' topLevel stacks and 19 px for palette titlebars.

You can check titlebar height yourself by positioning a stack at the top of the screen, and then in the msgBox:

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put the top of this stack - item 2 of the working screenrect 

Assuming the titlebar height is constant at 28 px, to position at topLevel stack properly at the bottom of the menubar:

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set the top of this stack to item 2 of the working screenRect + 28

Keep in mind a previous thread about the impact of changing scaleFactor - if you want. to make sure this always works with any scaleFactor, you need to divide the numbers with the stack's scalefactor:

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set the top of this stack to item 2 of the working screenrect/the scalefactor of this stack + 28/the scaleFactor of this stack

this should should position the titlebar of the stack exactly at the bottom of the menubar regardless of the stack's scaleFactor.

HTH
Stam

[richmond62]

That detail anent the window bar is well taken.

[richmond62]

I don't know what to "speak Richmond" means; especially as 'is well taken' is good English.

Anyway; to simplify things: your point about window bars is extremely relevant.