From b51ec1c32c4bcf30d4f83744944df889a89da70b Mon Sep 17 00:00:00 2001
From: bob <bcz@cs.brown.edu>
Date: Mon, 8 Jul 2019 13:26:45 -0400
Subject: added clearing of recently used docs.

---
 src/client/views/MainView.tsx                       |  3 ++-
 src/client/views/collections/CollectionTreeView.tsx | 15 ++++++++++++++-
 src/new_fields/Doc.ts                               | 12 +++++++++++-
 3 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/src/client/views/MainView.tsx b/src/client/views/MainView.tsx
index d7674c26e..fe59f52c8 100644
--- a/src/client/views/MainView.tsx
+++ b/src/client/views/MainView.tsx
@@ -1,5 +1,5 @@
 import { IconName, library } from '@fortawesome/fontawesome-svg-core';
-import { faArrowDown, faArrowUp, faBell, faCheck, faCommentAlt, faCut, faExclamation, faFilePdf, faFilm, faFont, faGlobeAsia, faImage, faMusic, faObjectGroup, faPenNib, faRedoAlt, faTable, faThumbtack, faTree, faUndoAlt } from '@fortawesome/free-solid-svg-icons';
+import { faArrowDown, faArrowUp, faCheck, faCommentAlt, faCut, faExclamation, faFilePdf, faFilm, faFont, faGlobeAsia, faImage, faMusic, faObjectGroup, faPenNib, faRedoAlt, faTable, faThumbtack, faTree, faUndoAlt } from '@fortawesome/free-solid-svg-icons';
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 import { action, computed, configure, observable, runInAction, reaction, trace } from 'mobx';
 import { observer } from 'mobx-react';
@@ -86,6 +86,7 @@ export class MainView extends React.Component {
             if (libraryHeight && Math.abs(CurrentUserUtils.UserDocument[HeightSym]() - libraryHeight) > 5) {
                 CurrentUserUtils.UserDocument.height = libraryHeight;
             }
+            (Cast(CurrentUserUtils.UserDocument.recentlyClosed, Doc) as Doc)!.allowClear = true;
         }, { fireImmediately: true });
     }
 
diff --git a/src/client/views/collections/CollectionTreeView.tsx b/src/client/views/collections/CollectionTreeView.tsx
index c83a2d2c6..d7725f444 100644
--- a/src/client/views/collections/CollectionTreeView.tsx
+++ b/src/client/views/collections/CollectionTreeView.tsx
@@ -1,5 +1,5 @@
 import { library } from '@fortawesome/fontawesome-svg-core';
-import { faAngleRight, faCamera, faExpand, faBell, faCaretDown, faCaretRight, faCaretSquareDown, faCaretSquareRight, faTrashAlt } from '@fortawesome/free-solid-svg-icons';
+import { faAngleRight, faCamera, faExpand, faTrash, faBell, faCaretDown, faCaretRight, faCaretSquareDown, faCaretSquareRight, faTrashAlt } from '@fortawesome/free-solid-svg-icons';
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 import { action, computed, observable, trace } from "mobx";
 import { observer } from "mobx-react";
@@ -51,6 +51,7 @@ export interface TreeViewProps {
 library.add(faTrashAlt);
 library.add(faAngleRight);
 library.add(faBell);
+library.add(faTrash);
 library.add(faCamera);
 library.add(faExpand);
 library.add(faCaretDown);
@@ -509,6 +510,17 @@ export class CollectionTreeView extends CollectionSubView(Document) {
             </div>
         </div >;
     }
+    @computed get clearButton() {
+        return <div id="toolbar" key="toolbar">
+            <div >
+                <button className="toolbar-button round-button" title="Notifs"
+                    onClick={undoBatch(action(() => Doc.GetProto(this.props.Document)[this.props.fieldKey] = undefined))}>
+                    <FontAwesomeIcon icon={faTrash} size="sm" />
+                </button>
+            </div>
+        </div >;
+    }
+
 
     render() {
         let dropAction = StrCast(this.props.Document.dropAction) as dropActionType;
@@ -535,6 +547,7 @@ export class CollectionTreeView extends CollectionSubView(Document) {
                         Doc.AddDocToList(this.props.Document, this.props.fieldKey, doc, this.childDocs.length ? this.childDocs[0] : undefined, true);
                     }} />
                 {this.props.Document.workspaceLibrary ? this.notifsButton : (null)}
+                {this.props.Document.allowClear ? this.clearButton : (null)}
                 <ul className="no-indent" style={{ width: "max-content" }} >
                     {
                         TreeView.GetChildElements(this.childDocs, this.props.Document[Id], this.props.Document, this.props.DataDoc, this.props.fieldKey, addDoc, this.remove,
diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index 092205f52..aa13b1d7a 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -9,6 +9,7 @@ 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";
+import { List } from "./List";
 
 export namespace Field {
     export function toScriptString(field: Field): string {
@@ -241,9 +242,18 @@ export namespace Doc {
         return Array.from(results);
     }
 
-    export function AddDocToList(target: Doc, key: string, doc: Doc, relativeTo?: Doc, before?: boolean, first?: boolean) {
+    export function AddDocToList(target: Doc, key: string, doc: Doc, relativeTo?: Doc, before?: boolean, first?: boolean, allowDuplicates?: boolean) {
+        if (target[key] === undefined) {
+            Doc.GetProto(target)[key] = new List<Doc>();
+        }
         let list = Cast(target[key], listSpec(Doc));
         if (list) {
+            if (allowDuplicates !== true) {
+                let pind = list.reduce((l, d, i) => d instanceof Doc && Doc.AreProtosEqual(d, doc) ? i : l, -1);
+                if (pind !== -1) {
+                    list.splice(pind, 1);
+                }
+            }
             if (first) list.splice(0, 0, doc);
             else {
                 let ind = relativeTo ? list.indexOf(relativeTo) : -1;
-- 
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