1 files changed, 94 insertions, 3 deletions

diff --git a/src/fields/ListField.ts b/src/fields/ListField.ts
index 8607ebe43..700600804 100644
--- a/src/fields/ListField.ts
+++ b/src/fields/ListField.ts
@@ -1,12 +1,103 @@
-import { Field } from "./Field";
+import { action, IArrayChange, IArraySplice, IObservableArray, observe, observable, Lambda } from "mobx";
+import { Server } from "../client/Server";
+import { UndoManager } from "../client/util/UndoManager";
+import { Types } from "../server/Message";
 import { BasicField } from "./BasicField";
+import { Field, FieldId } from "./Field";
 
 export class ListField<T extends Field> extends BasicField<T[]> {
-    constructor(data: T[] = []) {
-        super(data.slice());
+    private _proxies: string[] = []
+    constructor(data: T[] = [], id?: FieldId, save: boolean = true) {
+        super(data, save, id);
+        this.updateProxies();
+        if (save) {
+            Server.UpdateField(this);
+        }
+        this.observeList();
+    }
+
+    private observeDisposer: Lambda | undefined;
+    private observeList(): void {
+        this.observeDisposer = observe(this.Data as IObservableArray<T>, (change: IArrayChange<T> | IArraySplice<T>) => {
+            this.updateProxies()
+            if (change.type == "splice") {
+                UndoManager.AddEvent({
+                    undo: () => this.Data.splice(change.index, change.addedCount, ...change.removed),
+                    redo: () => this.Data.splice(change.index, change.removedCount, ...change.added)
+                })
+            } else {
+                UndoManager.AddEvent({
+                    undo: () => this.Data[change.index] = change.oldValue,
+                    redo: () => this.Data[change.index] = change.newValue
+                })
+            }
+            Server.UpdateField(this);
+        });
+    }
+
+    protected setData(value: T[]) {
+        if (this.observeDisposer) {
+            this.observeDisposer()
+        }
+        this.data = observable(value);
+        this.observeList();
+    }
+
+    private updateProxies() {
+        this._proxies = this.Data.map(field => field.Id);
+    }
+
+    UpdateFromServer(fields: string[]) {
+        this._proxies = fields;
+    }
+    private arraysEqual(a: any[], b: any[]) {
+        if (a === b) return true;
+        if (a == null || b == null) return false;
+        if (a.length != b.length) return false;
+
+        // If you don't care about the order of the elements inside
+        // the array, you should sort both arrays here.
+        // Please note that calling sort on an array will modify that array.
+        // you might want to clone your array first.
+
+        for (var i = 0; i < a.length; ++i) {
+            if (a[i] !== b[i]) return false;
+        }
+        return true;
+    }
+
+    init(callback: (field: Field) => any) {
+        Server.GetFields(this._proxies, action((fields: { [index: string]: Field }) => {
+            if (!this.arraysEqual(this._proxies, this.Data.map(field => field.Id))) {
+                this.data = this._proxies.map(id => fields[id] as T)
+                observe(this.Data, () => {
+                    this.updateProxies()
+                    Server.UpdateField(this);
+                })
+            }
+            callback(this);
+        }))
+    }
+
+    ToScriptString(): string {
+        return "new ListField([" + this.Data.map(field => field.ToScriptString()).join(", ") + "])";
     }
 
     Copy(): Field {
         return new ListField<T>(this.Data);
     }
+
+    ToJson(): { type: Types, data: string[], _id: string } {
+        return {
+            type: Types.List,
+            data: this._proxies,
+            _id: this.Id
+        }
+    }
+
+    static FromJson(id: string, ids: string[]): ListField<Field> {
+        let list = new ListField([], id, false);
+        list._proxies = ids;
+        return list
+    }
 }
\ No newline at end of file