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io/pointer: [API] split scroll bounds into two separate axes

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A single image.Rectangle for the scroll bounds introduced a subtle issue
with zero area rectangles (see #572). To avoid that and similar issues,
split the bounds into two separate one-dimensional ranges.

Fixes: https://todo.sr.ht/~eliasnaur/gio/572
Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2024-04-14 08:54:12 +02:00
parent 42ef3476cc
commit ee6cdec60b
7 changed files with 57 additions and 37 deletions
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io/input/pointer.go
+7 -5
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@@ -72,7 +72,7 @@ type pointerHandler struct {
type pointerFilter struct {
kinds pointer.Kind
// min and max horizontal/vertical scroll
scrollRange image.Rectangle
scrollX, scrollY pointer.ScrollRange
sourceMimes []string
targetMimes []string
@@ -297,7 +297,8 @@ func (p *pointerFilter) Add(f event.Filter) {
p.targetMimes = append(p.targetMimes, f.Type)
case pointer.Filter:
p.kinds = p.kinds | f.Kinds
p.scrollRange = p.scrollRange.Union(f.ScrollBounds)
p.scrollX = p.scrollX.Union(f.ScrollX)
p.scrollY = p.scrollY.Union(f.ScrollY)
}
}
@@ -325,7 +326,8 @@ func (p *pointerFilter) Matches(e event.Event) bool {
func (p *pointerFilter) Merge(p2 pointerFilter) {
p.kinds = p.kinds | p2.kinds
p.scrollRange = p.scrollRange.Union(p2.scrollRange)
p.scrollX = p.scrollX.Union(p2.scrollX)
p.scrollY = p.scrollY.Union(p2.scrollY)
p.sourceMimes = append(p.sourceMimes, p2.sourceMimes...)
p.targetMimes = append(p.targetMimes, p2.targetMimes...)
}
@@ -333,8 +335,8 @@ func (p *pointerFilter) Merge(p2 pointerFilter) {
// clampScroll splits a scroll distance in the remaining scroll and the
// scroll accepted by the filter.
func (p *pointerFilter) clampScroll(scroll f32.Point) (left, scrolled f32.Point) {
left.X, scrolled.X = clampSplit(scroll.X, p.scrollRange.Min.X, p.scrollRange.Max.X)
left.Y, scrolled.Y = clampSplit(scroll.Y, p.scrollRange.Min.Y, p.scrollRange.Max.Y)
left.X, scrolled.X = clampSplit(scroll.X, p.scrollX.Min, p.scrollX.Max)
left.Y, scrolled.Y = clampSplit(scroll.Y, p.scrollY.Min, p.scrollY.Max)
return
}