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layout: improve documentation for List.ScrollTo and List.ScrollBy

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Signed-off-by: Dominik Honnef <dominik@honnef.co>
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Dominik Honnef
2023-02-24 17:11:15 +01:00
committed by Elias Naur
parent dc9a4a4009
commit 107401cf07
1 changed files with 6 additions and 4 deletions
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layout/list.go
+6 -4
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@@ -356,8 +356,11 @@ func (l *List) layout(ops *op.Ops, macro op.MacroOp) Dimensions {
return Dimensions{Size: dims} return Dimensions{Size: dims}
} }
// ScrollBy scrolls the list by a relative amount of items. The result will only be accurate if all items have the same // ScrollBy scrolls the list by a relative amount of items.
// height. Otherwise, it will be approximate. //
// Fractional scrolling may be inaccurate for items of differing
// dimensions. This includes scrolling by integer amounts if the current
// l.Position.Offset is non-zero.
func (l *List) ScrollBy(num float32) { func (l *List) ScrollBy(num float32) {
// Split number of items into integer and fractional parts // Split number of items into integer and fractional parts
i, f := math.Modf(float64(num)) i, f := math.Modf(float64(num))
@@ -378,8 +381,7 @@ func (l *List) ScrollBy(num float32) {
l.Position.BeforeEnd = true l.Position.BeforeEnd = true
} }
// ScrollTo scrolls to the specified item. THe result will only be accurate if all items have the same height. // ScrollTo scrolls to the specified item.
// Otherwise, it will be approximate.
func (l *List) ScrollTo(n int) { func (l *List) ScrollTo(n int) {
l.Position.First = n l.Position.First = n
l.Position.Offset = 0 l.Position.Offset = 0