From 1b877f2b7c08322e9cfda1de7d29456ec6764fde Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=A0imon=20Brandner?= <simon.bra.ag@gmail.com>
Date: Tue, 11 May 2021 11:16:14 +0200
Subject: [PATCH] Make SpaceTreeLevelLayoutStore into a singleton
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Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>
---
 src/components/views/spaces/SpaceTreeLevel.tsx |  4 ++--
 src/stores/SpaceTreeLevelLayoutStore.ts        | 13 +++++++++++--
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/components/views/spaces/SpaceTreeLevel.tsx b/src/components/views/spaces/SpaceTreeLevel.tsx
index 52508e6320..f799cb02ba 100644
--- a/src/components/views/spaces/SpaceTreeLevel.tsx
+++ b/src/components/views/spaces/SpaceTreeLevel.tsx
@@ -69,7 +69,7 @@ export class SpaceItem extends React.PureComponent<IItemProps, IItemState> {
     constructor(props) {
         super(props);
 
-        const collapsed = SpaceTreeLevelLayoutStore.getSpaceCollapsedState(
+        const collapsed = SpaceTreeLevelLayoutStore.instance.getSpaceCollapsedState(
             props.space.roomId,
             this.props.parents,
             !props.isNested,
@@ -88,7 +88,7 @@ export class SpaceItem extends React.PureComponent<IItemProps, IItemState> {
         }
         const newCollapsedState = !this.state.collapsed;
 
-        SpaceTreeLevelLayoutStore.setSpaceCollapsedState(
+        SpaceTreeLevelLayoutStore.instance.setSpaceCollapsedState(
             this.props.space.roomId,
             this.props.parents,
             newCollapsedState,
diff --git a/src/stores/SpaceTreeLevelLayoutStore.ts b/src/stores/SpaceTreeLevelLayoutStore.ts
index 1250fee0b7..424e9f4012 100644
--- a/src/stores/SpaceTreeLevelLayoutStore.ts
+++ b/src/stores/SpaceTreeLevelLayoutStore.ts
@@ -26,12 +26,21 @@ const getSpaceCollapsedKey = (roomId: string, parents: Set<string>): string => {
 };
 
 export default class SpaceTreeLevelLayoutStore {
-    public static setSpaceCollapsedState(roomId: string, parents: Set<string>, collapsed: boolean) {
+    private static internalInstance: SpaceTreeLevelLayoutStore;
+
+    public static get instance(): SpaceTreeLevelLayoutStore {
+        if (!SpaceTreeLevelLayoutStore.internalInstance) {
+            SpaceTreeLevelLayoutStore.internalInstance = new SpaceTreeLevelLayoutStore();
+        }
+        return SpaceTreeLevelLayoutStore.internalInstance;
+    }
+
+    public setSpaceCollapsedState(roomId: string, parents: Set<string>, collapsed: boolean) {
         // XXX: localStorage doesn't allow booleans
         localStorage.setItem(getSpaceCollapsedKey(roomId, parents), collapsed.toString());
     }
 
-    public static getSpaceCollapsedState(roomId: string, parents: Set<string>, fallback: boolean): boolean {
+    public getSpaceCollapsedState(roomId: string, parents: Set<string>, fallback: boolean): boolean {
         const collapsedLocalStorage = localStorage.getItem(getSpaceCollapsedKey(roomId, parents));
         // XXX: localStorage doesn't allow booleans
         return collapsedLocalStorage ? collapsedLocalStorage === "true" : fallback;