Make value getters/setters more consistent

See #6

textinput.go

@@ -11,8 +11,8 @@ type TextInput struct {
 	tomo.TextBox
 	text []rune
 	on struct {
-		enter event.FuncBroadcaster
-		edit  event.FuncBroadcaster
+		enter       event.FuncBroadcaster
+		valueChange event.FuncBroadcaster
 	}
 }
 
@@ -47,9 +47,10 @@ func (this *TextInput) OnEnter (callback func ()) event.Cookie {
 	return this.on.enter.Connect(callback)
 }
 
-// OnEdit specifies a function to be called when the user edits the input text.
-func (this *TextInput) OnEdit (callback func ()) event.Cookie {
-	return this.on.edit.Connect(callback)
+// OnValueChange specifies a function to be called when the user edits the input
+// text.
+func (this *TextInput) OnValueChange (callback func ()) event.Cookie {
+	return this.on.valueChange.Connect(callback)
 }
 
 func (this *TextInput) handleKeyDown (key input.Key, numpad bool) {
@@ -100,7 +101,7 @@ func (this *TextInput) handleKeyDown (key input.Key, numpad bool) {
 	this.Select(dot)
 	if changed {
 		this.SetText(string(this.text))
-		this.on.edit.Broadcast()
+		this.on.valueChange.Broadcast()
 	}
 }