fix: Improve UI performance of ephemeral messages

src/page/template/modal/user-modal.htm

@@ -17,7 +17,7 @@
           params="user: user, actionsViewModel: actionsViewModel, onAction: onUserAction, isSelfActivated: isActivatedAccount()"
         ></user-actions>
       <!-- /ko -->
-      <!-- ko if: !user() && !userNotFound()  -->
+      <!-- ko if: isVisible() && !user() && !userNotFound()  -->
         <div class="loading-wrapper">
           <loading-icon></loading-icon>
         </div>

src/script/components/message/EphemeralTimer.test.ts

@@ -32,18 +32,23 @@ class EphemeralTimerPage extends TestPage<EphemeralTimerProps> {
 describe('EphemeralTimer', () => {
   it('shows the icon', () => {
     const message = new Message();
-    message.ephemeral_started(Date.now());
-    message.ephemeral_expires(new Date(new Date().getTime() + 10 * 60000).getTime());
+    const remaining = 600_000;
+    const now = Date.now();
+    message.ephemeral_started(now);
+    message.ephemeral_expires(now + remaining);
+    message.ephemeral_remaining(remaining);
 
     const ephemeralTimer = new EphemeralTimerPage({message});
     const circle = ephemeralTimer.getCircle();
-    expect(circle.props().style.animationDuration).toBe('600s');
+
+    expect(circle.props().style['--offset']).toBe(1);
   });
   it('hides the icon when no ephemeral timer was started', () => {
     const message = new Message();
 
     const ephemeralTimer = new EphemeralTimerPage({message});
     const circle = ephemeralTimer.getCircle();
-    expect(circle.props().style.animationDuration).toBe('0s');
+
+    expect(circle.props().style['--offset']).toBe(0);
   });
 });

src/script/components/message/EphemeralTimer.tsx

@@ -20,15 +20,20 @@
 import React from 'react';
 
 import type {Message} from '../../entity/message/Message';
-import {registerReactComponent} from 'Util/ComponentUtil';
+import {registerReactComponent, useKoSubscribableChildren} from 'Util/ComponentUtil';
 
 export interface EphemeralTimerProps {
   message: Message;
 }
 
 const EphemeralTimer: React.FC<EphemeralTimerProps> = ({message}) => {
-  const started = message.ephemeral_started();
-  const duration = ((message.ephemeral_expires() as number) - started) / 1000;
+  const {
+    ephemeral_remaining: remaining,
+    ephemeral_started: started,
+    ephemeral_expires: expires,
+  } = useKoSubscribableChildren(message, ['ephemeral_remaining', 'ephemeral_started', 'ephemeral_expires']);
+
+  const duration = expires - started;
 
   return (
     <svg className="ephemeral-timer" viewBox="0 0 8 8" width={8} height={8}>
@@ -39,7 +44,7 @@ const EphemeralTimer: React.FC<EphemeralTimerProps> = ({message}) => {
         cx={4}
         cy={4}
         r={2}
-        style={{animationDelay: `${(started - Date.now()) / 1000}s`, animationDuration: `${duration}s`}}
+        style={{'--offset': remaining / duration || 0} as React.CSSProperties}
         transform="rotate(-90 4 4)"
       />
     </svg>
@@ -49,6 +54,6 @@ const EphemeralTimer: React.FC<EphemeralTimerProps> = ({message}) => {
 export default EphemeralTimer;
 
 registerReactComponent('ephemeral-timer', {
+  bindings: 'message',
   component: EphemeralTimer,
-  template: '<div data-bind="react: {message}"></div>',
 });

src/script/conversation/ConversationEphemeralHandler.ts

@@ -48,7 +48,7 @@ export class ConversationEphemeralHandler extends AbstractConversationEventHandl
 
   static get CONFIG() {
     return {
-      INTERVAL_TIME: TIME_IN_MILLIS.SECOND * 0.25,
+      INTERVAL_TIME: TIME_IN_MILLIS.SECOND,
       TIMER_RANGE: {
         MAX: TIME_IN_MILLIS.YEAR,
         MIN: TIME_IN_MILLIS.SECOND,

src/script/entity/message/Message.ts

@@ -57,7 +57,6 @@ export class Message {
   public reaction: ReactionType;
   public readonly accent_color: ko.PureComputed<string>;
   public readonly ephemeral_caption: ko.PureComputed<string>;
-  public readonly ephemeral_duration: ko.Observable<number>;
   public readonly ephemeral_expires: ko.Observable<boolean | number | string>;
   public readonly ephemeral_remaining: ko.Observable<number>;
   public readonly ephemeral_started: ko.Observable<number>;
@@ -93,7 +92,6 @@ export class Message {
       const remainingTime = this.ephemeral_remaining();
       return remainingTime ? `${formatDurationCaption(remainingTime)} ${t('ephemeralRemaining')}` : '';
     });
-    this.ephemeral_duration = ko.observable(0);
     this.ephemeral_remaining = ko.observable(0);
     this.ephemeral_expires = ko.observable(false);
     this.ephemeral_started = ko.observable(0);

src/style/components/ephemeral-timer.less

@@ -28,21 +28,11 @@
   }
 
   &__dial {
-    animation-name: dial-animation;
-    animation-timing-function: steps(40);
+    --offset: 1;
     fill: none;
     stroke: var(--foreground);
     stroke-dasharray: @strokelength;
-    stroke-dashoffset: @strokelength;
+    stroke-dashoffset: calc(@strokelength * (1 + var(--offset)));
     stroke-width: @strokewidth;
   }
 }
-
-@keyframes dial-animation {
-  0% {
-    stroke-dashoffset: @strokelength * 2;
-  }
-  100% {
-    stroke-dashoffset: @strokelength;
-  }
-}