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layout: add List.Gap for spacing out items

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Signed-off-by: Egon Elbre <egonelbre@gmail.com>
This commit is contained in:
Egon Elbre
2026-02-17 22:12:34 +02:00
committed by Elias Naur
parent 9b38545fc2
commit 4ed9695d57
2 changed files with 107 additions and 7 deletions
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layout/list_test.go
+87
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@@ -184,6 +184,93 @@ func TestListPosition(t *testing.T) {
}
}
func TestListGap(t *testing.T) {
gtx := Context{
Ops: new(op.Ops),
Constraints: Constraints{
Max: image.Pt(100, 20),
},
}
// Two 10px children with 5px gap: total 25px.
l := List{Gap: 5}
dims := l.Layout(gtx, 2, func(gtx Context, idx int) Dimensions {
return Dimensions{Size: image.Pt(10, 10)}
})
if got, exp := dims.Size.X, 25; got != exp {
t.Errorf("two children with gap: got width %d, expected %d", got, exp)
}
// Three 10px children with 5px gap: total 40px.
l = List{Gap: 5}
dims = l.Layout(gtx, 3, func(gtx Context, idx int) Dimensions {
return Dimensions{Size: image.Pt(10, 10)}
})
if got, exp := dims.Size.X, 40; got != exp {
t.Errorf("three children with gap: got width %d, expected %d", got, exp)
}
// Single child: no gap.
l = List{Gap: 5}
dims = l.Layout(gtx, 1, func(gtx Context, idx int) Dimensions {
return Dimensions{Size: image.Pt(10, 10)}
})
if got, exp := dims.Size.X, 10; got != exp {
t.Errorf("single child with gap: got width %d, expected %d", got, exp)
}
// Zero children: no gap.
l = List{Gap: 5}
dims = l.Layout(gtx, 0, nil)
if got, exp := dims.Size.X, 0; got != exp {
t.Errorf("no children with gap: got width %d, expected %d", got, exp)
}
}
func TestListGapVertical(t *testing.T) {
gtx := Context{
Ops: new(op.Ops),
Constraints: Constraints{
Max: image.Pt(20, 100),
},
}
l := List{Axis: Vertical, Gap: 10}
dims := l.Layout(gtx, 3, func(gtx Context, idx int) Dimensions {
return Dimensions{Size: image.Pt(10, 15)}
})
// 3*15 + 2*10 = 65.
if got, exp := dims.Size.Y, 65; got != exp {
t.Errorf("vertical list with gap: got height %d, expected %d", got, exp)
}
}
func TestListGapPosition(t *testing.T) {
gtx := Context{
Ops: new(op.Ops),
Constraints: Constraints{
Max: image.Pt(30, 20),
},
}
// Viewport 30px, 5 children of 10px with 5px gap.
// Children fill: 10, 10+5+10=25, 25+5+10=40 >= 30, so 3 visible (last partially).
l := List{Gap: 5}
l.Layout(gtx, 5, func(gtx Context, idx int) Dimensions {
return Dimensions{Size: image.Pt(10, 10)}
})
if got, exp := l.Position.Count, 3; got != exp {
t.Errorf("visible count with gap: got %d, expected %d", got, exp)
}
if got, exp := l.Position.First, 0; got != exp {
t.Errorf("first with gap: got %d, expected %d", got, exp)
}
// OffsetLast = mainMax - size = 30 - 40 = -10.
if got, exp := l.Position.OffsetLast, -10; got != exp {
t.Errorf("offset last with gap: got %d, expected %d", got, exp)
}
}
func TestExtraChildren(t *testing.T) {
var l List
l.Position.First = 1