io/semantic: [API] replace DisabledOp with EnabledOp

The double-negative DisabledOp is harder to understand than a
straightforward EnabledOp. Note that the absence of an EnabledOp
implies still means that the widget is enabled.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

io/router/pointer.go

@@ -309,11 +309,11 @@ func (c *pointerCollector) semanticSelected(selected bool) {
 	area.semantic.content.selected = selected
 }
 
-func (c *pointerCollector) semanticDisabled(disabled bool) {
+func (c *pointerCollector) semanticEnabled(enabled bool) {
 	areaID := c.currentArea()
 	area := &c.q.areas[areaID]
 	area.semantic.valid = true
-	area.semantic.content.disabled = disabled
+	area.semantic.content.disabled = !enabled
 }
 
 func (c *pointerCollector) cursor(cursor pointer.Cursor) {

io/router/router.go

@@ -546,11 +546,11 @@ func (q *Router) collect() {
 			} else {
 				pc.semanticSelected(false)
 			}
-		case ops.TypeSemanticDisabled:
+		case ops.TypeSemanticEnabled:
 			if encOp.Data[1] != 0 {
-				pc.semanticDisabled(true)
+				pc.semanticEnabled(true)
 			} else {
-				pc.semanticDisabled(false)
+				pc.semanticEnabled(false)
 			}
 		}
 	}

io/router/semantic_test.go

@@ -78,7 +78,7 @@ func TestSemanticDescription(t *testing.T) {
 	semantic.DescriptionOp("description").Add(&ops)
 	semantic.LabelOp("label").Add(&ops)
 	semantic.Button.Add(&ops)
-	semantic.DisabledOp(true).Add(&ops)
+	semantic.EnabledOp(false).Add(&ops)
 	semantic.SelectedOp(true).Add(&ops)
 	var r Router
 	r.Frame(&ops)