I am porting a library for dynamic dialog creation to Cocoa.
The implementation is using various standard controls such as
NSTextField and NSButton. I have a question.

Suppose a dialog is to contain a line with multiple controls like

[ ] Add ________ seconds [before/after]

Here
[ ] Add  is a check box
_____  is an editable text field
seconds  is a noneditable text field
[before/after]  is a popup button

Each of these controls contains text, and the aim here is to align the text
so it does not jump up and down - to align the text baseline. If the top of
the controls, or the bottom of the controls, are aligned then the text
itself will not be aligned.

Two possibilities suggest themselves
- fixed constants, based on experiments (which will perhaps go awry if the
system configuration changes)
- work out the height of each of these controls, assume padding is equal
top and bottom, and adjust alignment by half of the difference (this is an
attractive idea, but I note in a single experiment that the height of
noneditable text was 16 while editable text was 21, a difference of 2.5
pixels which is awkward).

Is there a better way to do this? I imagine it's a problem faced before.

Thanks in advance.
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