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layout.List: reduce allocations when scrolling backward

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Signed-off-by: pierre <pierre.curto@gmail.com>
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pierre
2020-12-24 10:32:51 +01:00
committed by Elias Naur
parent 8a148ad6a1
commit d942b5c4d0
1 changed files with 3 additions and 1 deletions
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layout/list.go
+3 -1
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@@ -184,7 +184,9 @@ func (l *List) end(dims Dimensions, call op.CallOp) {
case iterateForward: case iterateForward:
l.children = append(l.children, child) l.children = append(l.children, child)
case iterateBackward: case iterateBackward:
l.children = append([]scrollChild{child}, l.children...) l.children = append(l.children, scrollChild{})
copy(l.children[1:], l.children)
l.children[0] = child
l.Position.First-- l.Position.First--
l.Position.Offset += mainSize l.Position.Offset += mainSize
default: default: