Updated documentation about intercepting keyboard events. Resolves #699

box.go

@@ -182,12 +182,8 @@ func (b *Box) InputHandler() func(event *tcell.EventKey, setFocus func(p Primiti
 //
 // Providing a nil handler will remove a previously existing handler.
 //
-// Note that this function will not have an effect on primitives composed of
-// other primitives, such as Form, Flex, or Grid. Key events are only captured
-// by the primitives that have focus (e.g. InputField) and only one primitive
-// can have focus at a time. Composing primitives such as Form pass the focus on
-// to their contained primitives and thus never receive any key events
-// themselves. Therefore, they cannot intercept key events.
+// This function can also be used on container primitives (like Flex, Grid, or
+// Form) as keyboard events will be handed down until they are handled.
 func (b *Box) SetInputCapture(capture func(event *tcell.EventKey) *tcell.EventKey) *Box {
 	b.inputCapture = capture
 	return b