Add boolean nodes

src/nodes/BooleanNode.ts

@@ -0,0 +1,22 @@
+import { AbstractNode, NodeMods, RenderOptions } from "./AbstractNode";
+import { Path } from "../model/Path";
+import { TreeView } from "../view/TreeView";
+
+export class BooleanNode extends AbstractNode<boolean> {
+  constructor(mods?: NodeMods<boolean>) {
+    super(mods)
+  }
+
+  render(path: Path, value: boolean, view: TreeView, options?: RenderOptions) {
+    const falseButton = view.registerClick(el => {
+      view.model.set(path, value === false ? undefined : false)
+    })
+    const trueButton = view.registerClick(el => {
+      view.model.set(path, value === true ? undefined : true)
+    })
+    return this.wrap(path, view, `
+      ${options?.hideLabel ? `` : `<label>${path.last()}</label>`}
+      <button${value === false ? ' style="font-weight: bold"' : ' '} data-id="${falseButton}">False</button>
+      <button${value === true ? ' style="font-weight: bold"' : ' '} data-id="${trueButton}">True</button>`)
+  }
+}