[editor only] Disable TTF fonts if BitmapFont is selected

assets/style/uiskin.json

@@ -142,6 +142,7 @@
     default: {
       font: default-font,
       fontColor: white,
+      disabledFontColor: grey,
       background: default-select,
       backgroundOver: default-select-over,
       scrollStyle: default,

src/main/java/games/rednblack/editor/view/ui/properties/panels/UILabelItemProperties.java

@@ -1,6 +1,8 @@
 package games.rednblack.editor.view.ui.properties.panels;
 
 import com.badlogic.gdx.graphics.g2d.BitmapFont;
+import com.badlogic.gdx.scenes.scene2d.Actor;
+import com.badlogic.gdx.scenes.scene2d.utils.ChangeListener;
 import com.badlogic.gdx.utils.Align;
 import com.badlogic.gdx.utils.Array;
 import com.kotcrab.vis.ui.widget.VisCheckBox;
@@ -224,6 +226,13 @@ public class UILabelItemProperties extends UIItemCollapsibleProperties {
     private void setListeners() {
         final String eventName = getUpdateEventName();
         bitmapFontSelectBox.addListener(new SelectBoxChangeListener(eventName));
+        bitmapFontSelectBox.addListener(new ChangeListener() {
+            @Override
+            public void changed(ChangeEvent event, Actor actor) {
+                fontFamilySelectBox.setDisabled(bitmapFontSelectBox.getSelectedIndex() != 0);
+                fontSizeField.setDisabled(bitmapFontSelectBox.getSelectedIndex() != 0);
+            }
+        });
         fontFamilySelectBox.addListener(new SelectBoxChangeListener(eventName));
         alignSelectBox.addListener(new SelectBoxChangeListener(eventName));
         boldCheckBox.addListener(new CheckBoxChangeListener(eventName));