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-rw-r--r--lib/ui/invalidatable.go24
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/ui/invalidatable.go b/lib/ui/invalidatable.go
new file mode 100644
index 00000000..92757121
--- /dev/null
+++ b/lib/ui/invalidatable.go
@@ -0,0 +1,24 @@
+package ui
+
+import (
+ "sync/atomic"
+)
+
+type Invalidatable struct {
+ onInvalidate atomic.Value
+}
+
+func (i *Invalidatable) OnInvalidate(f func(d Drawable)) {
+ i.onInvalidate.Store(f)
+}
+
+func (i *Invalidatable) DoInvalidate(d Drawable) {
+ v := i.onInvalidate.Load()
+ if v == nil {
+ return
+ }
+ f := v.(func(d Drawable))
+ if f != nil {
+ f(d)
+ }
+}