Add Comment component

src/Container.ts

@@ -3,6 +3,7 @@ import isString from "lodash-es/isString";
 import Component, { IComponentConstructor, IContainer } from "./Component";
 import ComponentRegistry from "./ComponentRegistry";
 import IMain from "./IMain";
+import Inert from "./Inert";
 import TextureSetManager from "./webgl/TextureSetManager";
 
 /**
@@ -49,6 +50,10 @@ export default abstract class Container extends Component implements IContainer
                     continue;
                 }
                 const component = new componentClass(this.main, this, opts);
+                if (component instanceof Inert) {
+                    // tslint:disable-next-line:no-console
+                    console.warn(`Inert Component: ${opts.type}. Will not affect rendering.`);
+                }
                 components.push(component);
             }
         }

src/EffectList.ts

@@ -3,6 +3,7 @@ import Container from "./Container";
 import CodeInstance from "./expr/CodeInstance";
 import compileExpr from "./expr/compileExpr";
 import IMain from "./IMain";
+import Inert from "./Inert";
 import { BlendMode } from "./utils";
 import TextureSetManager from "./webgl/TextureSetManager";
 
@@ -177,7 +178,7 @@ export default class EffectList extends Container {
         // render all the components
         // for (let i = 0; i < this.components.length; i++) {
         for (const component of this.components) {
-            if (component.isEnabled()) {
+            if (component.isEnabled() && !(component instanceof Inert)) {
                 component.draw();
             }
         }

src/Inert.ts

@@ -0,0 +1,19 @@
+import Component, { IContainer } from "./Component";
+import IMain from "./IMain";
+
+/**
+ * Base class for passive components.
+ *
+ * A base class for component types that don't affect rendering,
+ * most notably Comment, but also unknown components in general.
+ */
+export default abstract class Inert extends Component {
+    protected opts: any;
+
+    public init() {
+        throw new Error("Calling init on inert component.");
+    }
+    public draw() {
+        throw new Error("Calling draw on inert component.");
+    }
+}

src/Main.ts

@@ -8,6 +8,7 @@ import ComponentRegistry from "./ComponentRegistry";
 import EffectList from "./EffectList";
 import IMain from "./IMain";
 import BufferSave from "./misc/BufferSave";
+import Comment from "./misc/Comment";
 import GlobalVar from "./misc/GlobalVar";
 import Model from "./Model";
 import ClearScreen from "./render/ClearScreen";
@@ -403,6 +404,8 @@ export default class Main extends Model implements IMain {
 
             BufferSave,
             GlobalVar,
+
+            Comment,
         ]);
     }
 

src/misc/Comment.ts

@@ -0,0 +1,32 @@
+import { IContainer } from "../Component";
+import IMain from "../IMain";
+import Inert from "../Inert";
+
+export interface ICommentOpts {
+    text: string;
+}
+
+/**
+ * A component containing free text.
+ */
+export default class Comment extends Inert {
+    public static componentName: string = "Comment";
+    public static componentTag: string = "misc";
+    protected static optUpdateHandlers = {
+        text: "updateText",
+    };
+    protected static defaultOptions: ICommentOpts = {
+        text: "",
+    };
+
+    protected opts: ICommentOpts;
+    private text: string;
+
+    constructor(main: IMain, parent: IContainer, opts: any) {
+        super(main, parent, opts);
+    }
+
+    public updateText() {
+        this.text = this.opts.text;
+    }
+}