move live recording logic down the component tree

src/components/views/rooms/VoiceRecordComposerTile.tsx

@@ -227,8 +227,8 @@ export default class VoiceRecordComposerTile extends React.PureComponent<IProps,
 
         // only other UI is the recording-in-progress UI
         return <div className="mx_VoiceMessagePrimaryContainer mx_VoiceRecordComposerTile_recording">
-            <LiveRecordingClock seconds={this.state.seconds} />
-            <LiveRecordingWaveform relHeights={this.state.relHeights} />
+            <LiveRecordingClock recorder={this.state.recorder} />
+            <LiveRecordingWaveform recorder={this.state.recorder} />
         </div>;
     }
 

src/components/views/voice_messages/LiveRecordingClock.tsx

@@ -12,15 +12,62 @@ limitations under the License.
 */
 
 import React from "react";
-import Clock, { IProps as IClockProps } from "./Clock";
+import Clock from "./Clock";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { MarkedExecution } from "../../../utils/MarkedExecution";
+import {
+    IRecordingUpdate,
+    VoiceRecording,
+} from "../../../voice/VoiceRecording";
+
+interface IProps {
+    recorder?: VoiceRecording;
+}
+
+interface IState {
+    seconds: number;
+}
 
 /**
  * A clock for a live recording.
  */
 @replaceableComponent("views.voice_messages.LiveRecordingClock")
-export default class LiveRecordingClock extends React.PureComponent<IClockProps> {
+export default class LiveRecordingClock extends React.PureComponent<IProps, IState> {
+    private seconds = 0;
+    private rafId: number;
+
+    state = {
+        seconds: 0,
+    }
+
+    componentDidMount() {
+        this.props.recorder.liveData.onUpdate((update: IRecordingUpdate) => {
+            this.seconds = update.timeSeconds;
+            this.scheduledUpdate.mark();
+        });
+    }
+
+    private scheduledUpdate = new MarkedExecution(
+        () => this.updateClock(),
+        () => this.onLiveDataUpdate(),
+    )
+
+    private onLiveDataUpdate() {
+        if (this.rafId) {
+            cancelAnimationFrame(this.rafId);
+        }
+
+        this.rafId = requestAnimationFrame(() => this.scheduledUpdate.trigger())
+    }
+
+    private updateClock() {
+        this.setState({
+            seconds: this.seconds,
+        })
+        this.rafId = null;
+    }
+
     public render() {
-        return <Clock seconds={this.props.seconds} />;
+        return <Clock seconds={this.state.seconds} />;
     }
 }

src/components/views/voice_messages/LiveRecordingWaveform.tsx

@@ -12,18 +12,66 @@ limitations under the License.
 */
 
 import React from "react";
-import Waveform, { IProps as IWaveformProps } from "./Waveform";
+import Waveform from "./Waveform";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
+import { MarkedExecution } from "../../../utils/MarkedExecution";
+import {
+    IRecordingUpdate,
+    VoiceRecording,
+} from "../../../voice/VoiceRecording";
+
+interface IProps {
+    recorder?: VoiceRecording;
+}
+
+interface IState {
+    waveform: number[]
+}
 
 /**
  * A waveform which shows the waveform of a live recording
  */
 @replaceableComponent("views.voice_messages.LiveRecordingWaveform")
-export default class LiveRecordingWaveform extends React.PureComponent<IWaveformProps> {
+export default class LiveRecordingWaveform extends React.PureComponent<IProps, IState> {
     public static defaultProps = {
         progress: 1,
     };
+
+    private waveform: number[] = [];
+    private rafId: number;
+
+    state = {
+        waveform: [],
+    }
+
+    componentDidMount() {
+        this.props.recorder.liveData.onUpdate((update: IRecordingUpdate) => {
+            this.waveform = update.waveform;
+            this.scheduledUpdate.mark();
+        });
+    }
+
+    private scheduledUpdate = new MarkedExecution(
+        () => this.updateWaveform(),
+        () => this.onLiveDataUpdate(),
+    )
+
+    private onLiveDataUpdate() {
+        if (this.rafId) {
+            cancelAnimationFrame(this.rafId);
+        }
+
+        this.rafId = requestAnimationFrame(() => this.scheduledUpdate.trigger())
+    }
+
+    private updateWaveform() {
+        this.setState({
+            waveform: this.waveform,
+        })
+        this.rafId = null;
+    }
+
     public render() {
-        return <Waveform relHeights={this.props.relHeights} />;
+        return <Waveform relHeights={this.state.waveform} />;
     }
 }

src/utils/MarkedExecution.ts

@@ -22,7 +22,7 @@ limitations under the License.
  * The function starts unmarked.
  */
 export class MarkedExecution {
-    private marked = false;
+    private _marked = false;
 
     /**
      * Creates a MarkedExecution for the provided function.
@@ -33,26 +33,33 @@ export class MarkedExecution {
     constructor(private fn: () => void, private onMarkCallback?: () => void) {
     }
 
+    /**
+     * Getter for the _marked property
+     */
+    public get marked() {
+        return this._marked;
+    }
+
     /**
      * Resets the mark without calling the function.
      */
     public reset() {
-        this.marked = false;
+        this._marked = false;
     }
 
     /**
      * Marks the function to be called upon trigger().
      */
     public mark() {
-        if (!this.marked) this.onMarkCallback?.();
-        this.marked = true;
+        if (!this._marked) this.onMarkCallback?.();
+        this._marked = true;
     }
 
     /**
      * If marked, the function will be called, otherwise this does nothing.
      */
     public trigger() {
-        if (!this.marked) return;
+        if (!this._marked) return;
         this.reset(); // reset first just in case the fn() causes a trigger()
         this.fn();
     }