implement quill binding for y-text

src/Binding/QuillBinding.js

@@ -0,0 +1,37 @@
+
+import Binding from './Binding.js'
+
+function typeObserver (event) {
+  const quill = this.target
+  quill.update('yjs')
+  this._mutualExclude(function () {
+    quill.updateContents(event.delta, 'yjs')
+    quill.update('yjs') // ignore applied changes
+  })
+}
+
+function quillObserver (delta) {
+  this._mutualExclude(() => {
+    this.type.applyDelta(delta.ops)
+  })
+}
+
+export default class QuillBinding extends Binding {
+  constructor (textType, quillInstance) {
+    // Binding handles textType as this.type and quillInstance as this.target
+    super(textType, quillInstance)
+    // set initial value
+    quillInstance.setContents(textType.toDelta(), 'yjs')
+    // Observers are handled by this class
+    this._typeObserver = typeObserver.bind(this)
+    this._quillObserver = quillObserver.bind(this)
+    textType.observe(this._typeObserver)
+    quillInstance.on('text-change', this._quillObserver)
+  }
+  destroy () {
+    // Remove everything that is handled by this class
+    this.type.unobserve(this._typeObserver)
+    this.target.unobserve(this._quillObserver)
+    super.destroy()
+  }
+}