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-rw-r--r--lib/ui/interfaces.go9
-rw-r--r--lib/ui/ui.go2
2 files changed, 7 insertions, 4 deletions
diff --git a/lib/ui/interfaces.go b/lib/ui/interfaces.go
index d27afe2..0cdffc1 100644
--- a/lib/ui/interfaces.go
+++ b/lib/ui/interfaces.go
@@ -4,12 +4,15 @@ import (
 	"github.com/gdamore/tcell"
 )
 
+// Drawable is a UI component that can draw. Unless specified, all methods must
+// only be called from a single goroutine, the UI goroutine.
 type Drawable interface {
-	// Called when this renderable should draw itself
+	// Called when this renderable should draw itself.
 	Draw(ctx *Context)
-	// Specifies a function to call when this cell needs to be redrawn
+	// Specifies a function to call when this cell needs to be redrawn. The
+	// callback may be called in any goroutine.
 	OnInvalidate(callback func(d Drawable))
-	// Invalidates the drawable
+	// Invalidates the drawable. This can be called from any goroutine.
 	Invalidate()
 }
 
diff --git a/lib/ui/ui.go b/lib/ui/ui.go
index 9d9a5da..91a26da 100644
--- a/lib/ui/ui.go
+++ b/lib/ui/ui.go
@@ -10,7 +10,7 @@ import (
 
 type UI struct {
 	Content DrawableInteractive
-	exit    atomic.Value
+	exit    atomic.Value // bool
 	ctx     *Context
 	screen  tcell.Screen