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io/pointer,io/router: make PassOp apply to InputOps, not areas

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We're about to make clip.Ops act as pointer areas, in which case we'd
like to contain the effect of PassOp to just pointer InputOps.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-10-24 16:40:40 +02:00
parent 563eb60382
commit 8cafbd309f
3 changed files with 72 additions and 26 deletions
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io/pointer/doc.go
+15 -16
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@@ -59,30 +59,29 @@ For example:
implies a tree of two inner nodes, each with one pointer handler attached.
When determining which handlers match an Event, only handlers whose
areas contain the event position are considered. The matching
proceeds as follows.
The matching proceeds as follows.
First, the foremost area that contains the event is found. If no such area
exists, matching stops.
First, the foremost area that contains the event is found. Only areas whose
parent areas all contain the event is considered.
Then, every handler attached to the area or an area in the area stack is
matched with the event.
Then, every handler attached to the area is matched with the event.
Third, If the area or any area in the area stack has pass-through enabled,
the matching repeats with the next foremost area.
If all attached handlers are marked pass-through, the matching repeats with the
next foremost (sibling) area. Otherwise the matching repeats with the parent
area.
In the example above, all events will go to h2 only even though both
handlers have the same area (the implicit area that fills the window).
In the example above, all events will go to h2 because it and h1 are siblings
and none are pass-through.
Pass-through
The PassOp operations controls the pass-through setting. A handler's
pass-through setting is recorded along with the InputOp.
The PassOp operations controls the pass-through setting. All handlers added
inside one or more PassOp scopes are marked pass-through.
Pass-through handlers are useful for overlay widgets such as a hidden
side drawer. When the user touches the side, both the (transparent)
drawer handle and the interface below should receive pointer events.
Pass-through is useful for overlay widgets. Consider a hidden side drawer: when
the user touches the side, both the (transparent) drawer handle and the
interface below should receive pointer events. This effect is achieved by
marking the drawer handle pass-through.
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