io: [API] introduce event filters; convert pointer input to use them

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Instead of having to supply the predicates for event filtering at the
time of layout, the new Filter type allows widgets to filter at the time
of calling Source.Events. There is then only the need for a single input
op type, in package event.

Filters most importantly allow the use of one tag for several event types,
and we can define that a widget w has &w as its primary tag, by convention.
This allows the replacement of per-widget Focus methods with direct uses
of FocusCmd{&w}, and the later addition of Source.Focused(&w) queries.

Note that the TestCursor test needed restructuring to avoid its use of
InputOps.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

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Elias Naur

2023-10-16 17:57:27 -05:00

parent d2085ab7c5

commit ef8171b971

19 changed files with 521 additions and 504 deletions

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io/input/pointer_test.go

+245 -260

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