4 files changed, 73 insertions, 1 deletions
diff --git a/src/fields/AudioField.ts b/src/fields/AudioField.ts
new file mode 100644
index 000000000..aefcc15c1
--- /dev/null
+++ b/src/fields/AudioField.ts
@@ -0,0 +1,31 @@
+import { BasicField } from "./BasicField";
+import { Field, FieldId } from "./Field";
+import { Types } from "../server/Message";
+
+export class AudioField extends BasicField<URL> {
+    constructor(data: URL | undefined = undefined, id?: FieldId, save: boolean = true) {
+        super(data == undefined ? new URL("http://techslides.com/demos/samples/sample.mp3") : data, save, id);
+    }
+
+    toString(): string {
+        return this.Data.href;
+    }
+    
+    
+    ToScriptString(): string {
+        return `new AudioField("${this.Data}")`;
+    }
+
+    Copy(): Field {
+        return new AudioField(this.Data);
+    }
+
+    ToJson(): { type: Types, data: URL, _id: string } {
+        return {
+            type: Types.Audio,
+            data: this.Data,
+            _id: this.Id
+        }
+    }
+
+}
+\ No newline at end of file
diff --git a/src/fields/Document.ts b/src/fields/Document.ts
index 2e873439c..25e239417 100644
--- a/src/fields/Document.ts
+++ b/src/fields/Document.ts
@@ -1,6 +1,6 @@
 import { Key } from "./Key"
 import { KeyStore } from "./KeyStore";
-import { Field, Cast, FieldWaiting, FieldValue, FieldId } from "./Field"
+import { Field, Cast, FieldWaiting, FieldValue, FieldId, Opt } from "./Field"
 import { NumberField } from "./NumberField";
 import { ObservableMap, computed, action } from "mobx";
 import { TextField } from "./TextField";
@@ -128,6 +128,12 @@ export class Document extends Field {
         return false;
     }
 
+    GetTAsync<T extends Field>(key: Key, ctor: { new(): T }, callback: (field: Opt<T>) => void): boolean {
+        return this.GetAsync(key, (field) => {
+            callback(Cast(field, ctor));
+        })
+    }
+
     /**
      * Same as {@link Document#GetAsync}, except a field of the given type
      * will be created if there is no field associated with the given key,
diff --git a/src/fields/KeyStore.ts b/src/fields/KeyStore.ts
index f67257093..71b189e19 100644
--- a/src/fields/KeyStore.ts
+++ b/src/fields/KeyStore.ts
@@ -27,8 +27,13 @@ export namespace KeyStore {
     export const Caption = new Key("Caption");
     export const ActiveFrame = new Key("ActiveFrame");
     export const DocumentText = new Key("DocumentText");
+    export const LinkedToDocs = new Key("LinkedToDocs");
+    export const LinkedFromDocs = new Key("LinkedFromDocs");
+    export const LinkDescription = new Key("LinkDescription");
+    export const LinkTags = new Key("LinkTag");
     export const Thumbnail = new Key("Thumbnail");
     export const CurPage = new Key("CurPage");
     export const NumPages = new Key("NumPages");
     export const Ink = new Key("Ink");
+    export const ActiveUsers = new Key("Active Users");
 }
diff --git a/src/fields/VideoField.ts b/src/fields/VideoField.ts
new file mode 100644
index 000000000..5f4ae19bf
--- /dev/null
+++ b/src/fields/VideoField.ts
@@ -0,0 +1,30 @@
+import { BasicField } from "./BasicField";
+import { Field, FieldId } from "./Field";
+import { Types } from "../server/Message";
+
+export class VideoField extends BasicField<URL> {
+    constructor(data: URL | undefined = undefined, id?: FieldId, save: boolean = true) {
+        super(data == undefined ? new URL("http://techslides.com/demos/sample-videos/small.mp4") : data, save, id);
+    }
+
+    toString(): string {
+        return this.Data.href;
+    }
+
+    ToScriptString(): string {
+        return `new VideoField("${this.Data}")`;
+    }
+
+    Copy(): Field {
+        return new VideoField(this.Data);
+    }
+
+    ToJson(): { type: Types, data: URL, _id: string } {
+        return {
+            type: Types.Video,
+            data: this.Data,
+            _id: this.Id
+        }
+    }
+
+}
+\ No newline at end of file