VN textbox event

src/dawn/scene/SceneItem.hpp

@@ -12,7 +12,7 @@
 namespace Dawn {
   class SceneItemComponent;
 
-  class SceneItem {
+  class SceneItem : public StateOwner {
     private:
       std::vector<SceneItemComponent*> components;
 

src/dawn/scene/components/ui/UILabel.cpp

@@ -111,6 +111,10 @@ void UILabel::onStart() {
     alignmentNeedsUpdating = true;
   }, { &fontSize, &font, &text, &maxWidth, &startQuad, &quadCount });
 
+  useEffect([&]{
+    eventTextChanged.invoke();
+  }, text);
+
   useEffect([&]{
     needsRebuffering = true;
   }, alignmentNeedsUpdating);

src/dawn/scene/components/ui/UILabel.hpp

@@ -45,6 +45,7 @@ namespace Dawn {
       StateProperty<int32_t> quadCount;
 
       StateEvent<> eventFontRebuffered;
+      StateEvent<> eventTextChanged;
       
       struct FontMeasure measure;