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ui: support Window.Draw(nil) in OpsReader

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-07-15 11:42:47 +02:00
parent 5b3090b128
commit 8eb58ff2eb
1 changed files with 9 additions and 2 deletions
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ui/ops.go
+9 -2
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@@ -231,15 +231,22 @@ func (b BlockOp) Add(o *Ops) {
// Reset start reading from the op list. // Reset start reading from the op list.
func (r *OpsReader) Reset(ops *Ops) { func (r *OpsReader) Reset(ops *Ops) {
r.stack = r.stack[:0]
r.pc = pc{}
r.ops = nil
if ops == nil {
return
}
if n := len(ops.stack); n > 0 { if n := len(ops.stack); n > 0 {
panic(fmt.Errorf("%d Begin(s) not matched with End", n)) panic(fmt.Errorf("%d Begin(s) not matched with End", n))
} }
r.ops = &ops.ops r.ops = &ops.ops
r.stack = r.stack[:0]
r.pc = pc{}
} }
func (r *OpsReader) Decode() (EncodedOp, bool) { func (r *OpsReader) Decode() (EncodedOp, bool) {
if r.ops == nil {
return EncodedOp{}, false
}
for { for {
if len(r.stack) > 0 { if len(r.stack) > 0 {
b := r.stack[len(r.stack)-1] b := r.stack[len(r.stack)-1]