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ui: make OpPush and OpPop explicit

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We're about to allow OpBlock for invoking ops from multiple (cached)
Ops containers. To allow for drawing state changes to stick after
invoking such a cached block, we can't let OpBlock perform an implicit
save and restore of drawing state.

Instead, introduce OpPush and OpPop for explicit drawing state stack
management.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-06-02 15:10:09 +02:00
parent bf5d083b8a
commit 9142345fd4
7 changed files with 28 additions and 20 deletions
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ui/layout/list.go
+2 -2
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@@ -178,13 +178,13 @@ func (l *List) Layout(ops *ui.Ops) Dimens {
Min: axisPoint(l.Axis, min, -ui.Inf),
Max: axisPoint(l.Axis, max, ui.Inf),
}
ops.Begin()
ui.OpPush{}.Add(ops)
draw.OpClip{Path: draw.RectPath(r)}.Add(ops)
ui.OpTransform{
Transform: ui.Offset(toPointF(axisPoint(l.Axis, pos, cross))),
}.Add(ops)
child.block.Add(ops)
ops.End().Add(ops)
ui.OpPop{}.Add(ops)
pos += axisMain(l.Axis, sz)
}
atStart := l.first == 0 && l.offset <= 0