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io/pointer,io/router: replace AreaOp with clip.Op

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Pointer hit areas and paint clip areas are separate concepts, but
similar enough to warrant merging. This change replaces pointer hit
areas with clip areas, so Gio is left with just one area concept (in
package op/clip).

The reason for separating the concepts in the original Gio release was
because of my being unsure general path/stroke hit areas would ever be
implemented, let alone efficient.

This change represents a change of mind, in the sense that it's better
to have an incomplete API than two separate area concepts.

Leave the deprecated pointer.Rect, pointer.Ellipse for temporary
backwards compatibility.

This is an API change. Most existing programs should continue to build
with this change, but may have to adjust to having all clip.Ops participate
in InputOp hit areas.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-10-25 11:31:04 +02:00
parent 28fc08a508
commit 29cea1db49
12 changed files with 127 additions and 140 deletions
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op/clip/doc.go
+3 -3
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@@ -1,10 +1,10 @@
// SPDX-License-Identifier: Unlicense OR MIT
/*
Package clip provides operations for clipping paint operations.
Drawing outside the current clip area is ignored.
Package clip provides operations for defining areas that applies to operations
such as paints and pointer handlers.
The current clip is initially the infinite set. Pushing and Op sets the clip
The current clip is initially the infinite set. Pushing an Op sets the clip
to the intersection of the current clip and pushed clip area. Popping the
area restores the clip to its state before pushing.