1 files changed, 21 insertions, 4 deletions

diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index 734a90731..092205f52 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -8,6 +8,7 @@ import { listSpec } from "./Schema";
 import { ObjectField } from "./ObjectField";
 import { RefField, FieldId } from "./RefField";
 import { ToScriptString, SelfProxy, Parent, OnUpdate, Self, HandleUpdate, Update, Id } from "./FieldSymbols";
+import { scriptingGlobal } from "../client/util/Scripting";
 
 export namespace Field {
     export function toScriptString(field: Field): string {
@@ -55,6 +56,7 @@ export function DocListCast(field: FieldResult): Doc[] {
 export const WidthSym = Symbol("Width");
 export const HeightSym = Symbol("Height");
 
+@scriptingGlobal
 @Deserializable("doc").withFields(["id"])
 export class Doc extends RefField {
     constructor(id?: FieldId, forceSave?: boolean) {
@@ -239,16 +241,31 @@ export namespace Doc {
         return Array.from(results);
     }
 
-    export function AddDocToList(target: Doc, key: string, doc: Doc, relativeTo?: Doc, before?: boolean) {
+    export function AddDocToList(target: Doc, key: string, doc: Doc, relativeTo?: Doc, before?: boolean, first?: boolean) {
         let list = Cast(target[key], listSpec(Doc));
         if (list) {
-            let ind = relativeTo ? list.indexOf(relativeTo) : -1;
-            if (ind === -1) list.push(doc);
-            else list.splice(before ? ind : ind + 1, 0, doc);
+            if (first) list.splice(0, 0, doc);
+            else {
+                let ind = relativeTo ? list.indexOf(relativeTo) : -1;
+                if (ind === -1) list.push(doc);
+                else list.splice(before ? ind : ind + 1, 0, doc);
+            }
         }
         return true;
     }
 
+    export function ComputeContentBounds(doc: Doc) {
+        let bounds = DocListCast(doc.data).reduce((bounds, doc) => {
+            var [sptX, sptY] = [NumCast(doc.x), NumCast(doc.y)];
+            let [bptX, bptY] = [sptX + doc[WidthSym](), sptY + doc[HeightSym]()];
+            return {
+                x: Math.min(sptX, bounds.x), y: Math.min(sptY, bounds.y),
+                r: Math.max(bptX, bounds.r), b: Math.max(bptY, bounds.b)
+            };
+        }, { x: Number.MAX_VALUE, y: Number.MAX_VALUE, r: Number.MIN_VALUE, b: Number.MIN_VALUE });
+        return bounds;
+    }
+
     //
     // Resolves a reference to a field by returning 'doc' if o field extension is specified,
     // otherwise, it returns the extension document stored in doc.<fieldKey>_ext.