From 20becbb5ca40350ed85e01f73f29621ba7783bb9 Mon Sep 17 00:00:00 2001
From: bob <bcz@cs.brown.edu>
Date: Wed, 24 Apr 2019 12:20:38 -0400
Subject: playing with linking

---
 src/fields/Document.ts | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'src/fields/Document.ts')

diff --git a/src/fields/Document.ts b/src/fields/Document.ts
index 7cf784f0e..7a7dbc3fe 100644
--- a/src/fields/Document.ts
+++ b/src/fields/Document.ts
@@ -371,6 +371,37 @@ export class Document extends Field {
         return alias;
     }
 
+    @action
+    CreateLink(dstTarg: Document) {
+        let batch = UndoManager.StartBatch("document view drop");
+        let linkDoc: Document = new Document();
+        linkDoc.SetText(KeyStore.Title, "New Link");
+        linkDoc.SetText(KeyStore.LinkDescription, "");
+        linkDoc.SetText(KeyStore.LinkTags, "Default");
+
+        let srcTarg = this;
+        linkDoc.Set(KeyStore.LinkedToDocs, dstTarg);
+        linkDoc.Set(KeyStore.LinkedFromDocs, srcTarg);
+        const prom1 = new Promise(resolve => dstTarg.GetOrCreateAsync(
+            KeyStore.LinkedFromDocs,
+            ListField,
+            field => {
+                (field as ListField<Document>).Data.push(linkDoc);
+                resolve();
+            }
+        ));
+        const prom2 = new Promise(resolve => srcTarg.GetOrCreateAsync(
+            KeyStore.LinkedToDocs,
+            ListField,
+            field => {
+                (field as ListField<Document>).Data.push(linkDoc);
+                resolve();
+            }
+        ));
+        Promise.all([prom1, prom2]).finally(() => batch.end());
+        return linkDoc;
+    }
+
     MakeDelegate(id?: string): Document {
         let delegate = new Document(id);
 
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