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dialog system: add a side-by-side alignment feature.

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This will let us put two controls side by side (e.g. in disjoint
columns of a multi-col layout) and indicate that instead of the
default behaviour of aligning their top edges, their centreline (or,
even better if available, font baseline) should be aligned.

NFC: nothing uses this yet.
This commit is contained in:
Simon Tatham
2021-04-03 17:45:31 +01:00
parent d33f889a56
commit 1276c13e6a
5 changed files with 103 additions and 4 deletions
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15
dialog.h
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@ -113,7 +113,8 @@ typedef void (*handler_fn)(union control *ctrl, dlgparam *dp,
int column; \
handler_fn handler; \
intorptr context; \
intorptr helpctx
intorptr helpctx; \
union control *align_next_to
union control {
/*
@ -179,6 +180,18 @@ union control {
* to ensure it brings up the right piece of help text.
*/
intorptr helpctx;
/*
* Setting this to non-NULL coerces two controls to have their
* y-coordinates adjusted so that they can sit alongside each
* other and look nicely aligned, even if they're different
* heights.
*
* Set this field on the _second_ control of the pair (in
* terms of order in the data structure), so that when it's
* instantiated, the first one is already there to be referred
* to.
*/
union control *align_next_to;
} generic;
struct {
STANDARD_PREFIX;