Some Updates

wdgt_field.go

@@ -42,7 +42,7 @@ type Field struct {
 	x, y      int
 	w, h      int
 
-	filter   func(*tcell.EventKey) bool
+	filter   func(tcell.EventKey) bool
 	onChange func(prev, curr string)
 
 	keyMap KeyMap
@@ -60,9 +60,9 @@ func (w *Field) Init(id string, style tcell.Style) {
 	w.id = id
 	w.style = style
 	w.visible = true
-	w.filter = func(ev *tcell.EventKey) bool {
-		return wh.IsBS(*ev) ||
-			wh.KeyIsDisplayable(*ev)
+	w.filter = func(ev tcell.EventKey) bool {
+		return wh.IsBS(ev) ||
+			wh.KeyIsDisplayable(ev)
 	}
 	w.keyMap = NewKeyMap(map[tcell.Key]func(ev *tcell.EventKey) bool{
 		tcell.KeyLeft:  w.handleLeft,
@@ -98,7 +98,7 @@ func (w *Field) HandleKey(ev *tcell.EventKey) bool {
 	if ok := w.keyMap.Handle(ev); ok {
 		return true
 	}
-	if w.filter != nil && !w.filter(ev) {
+	if w.filter != nil && !w.filter(*ev) {
 		return false
 	}
 	if ev.Key() == tcell.KeyRune {
@@ -238,3 +238,17 @@ func (w *Field) doOnChange(prev, curr string) {
 		w.onChange(prev, curr)
 	}
 }
+
+func (w *Field) SetFilter(f func(ev tcell.EventKey) bool) {
+	w.filter = func(ev tcell.EventKey) bool {
+		// We always want to make sure we allow backspace.
+		if wh.IsBS(ev) {
+			return true
+		}
+		// We also always want to make sure it's displayable
+		if !wh.KeyIsDisplayable(ev) {
+			return false
+		}
+		return f(ev)
+	}
+}