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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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widget/editor.go
+6 -6
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@@ -228,19 +228,19 @@ func (e *Editor) processPointer(gtx layout.Context) (EditorEvent, bool) {
axis = gesture.Vertical
smin, smax = sbounds.Min.Y, sbounds.Max.Y
}
var scrollRange image.Rectangle
var scrollX, scrollY pointer.ScrollRange
textDims := e.text.FullDimensions()
visibleDims := e.text.Dimensions()
if e.SingleLine {
scrollOffX := e.text.ScrollOff().X
scrollRange.Min.X = min(-scrollOffX, 0)
scrollRange.Max.X = max(0, textDims.Size.X-(scrollOffX+visibleDims.Size.X))
scrollX.Min = min(-scrollOffX, 0)
scrollX.Max = max(0, textDims.Size.X-(scrollOffX+visibleDims.Size.X))
} else {
scrollOffY := e.text.ScrollOff().Y
scrollRange.Min.Y = -scrollOffY
scrollRange.Max.Y = max(0, textDims.Size.Y-(scrollOffY+visibleDims.Size.Y))
scrollY.Min = -scrollOffY
scrollY.Max = max(0, textDims.Size.Y-(scrollOffY+visibleDims.Size.Y))
}
sdist := e.scroller.Update(gtx.Metric, gtx.Source, gtx.Now, axis, scrollRange)
sdist := e.scroller.Update(gtx.Metric, gtx.Source, gtx.Now, axis, scrollX, scrollY)
var soff int
if e.SingleLine {
e.text.ScrollRel(sdist, 0)