Update duration display on selection change

frontend/src/App.tsx

@@ -17,8 +17,9 @@ import { firstValueFrom, from, Observable } from 'rxjs';
 import { first, map } from 'rxjs/operators';
 import millisFromDuration from './helpers/millisFromDuration';
 import { zoomViewportIn, zoomViewportOut } from './helpers/zoom';
-
+import toHHMMSS from './helpers/toHHMMSS';
-import { ExternalLinkIcon } from '@heroicons/react/solid';
+import framesToDuration from './helpers/framesToDuration';
+import { ClockIcon, ExternalLinkIcon } from '@heroicons/react/solid';
 
 // ported from backend, where should they live?
 const thumbnailWidth = 177; // height 100
@@ -330,8 +331,6 @@ function App(): JSX.Element {
     })();
   };
 
-  const zoomMultiplier = 1.777;
-
   const handleZoomIn = () => {
     if (mediaSet == null) {
       return;
@@ -392,6 +391,26 @@ function App(): JSX.Element {
     [mediaSet]
   );
 
+  const durationString = useCallback((): string => {
+    if (!mediaSet || !mediaSet.videoDuration) {
+      return '';
+    }
+
+    const totalDur = toHHMMSS(mediaSet.videoDuration);
+    if (selection.start == selection.end) {
+      return totalDur;
+    }
+
+    const clipDur = toHHMMSS(
+      framesToDuration(
+        selection.end - selection.start,
+        mediaSet.audioSampleRate
+      )
+    );
+
+    return `Selected ${clipDur} of ${totalDur}`;
+  }, [mediaSet, selection]);
+
   // render component
 
   const offsetPixels = Math.floor(thumbnailWidth / 2);
@@ -408,7 +427,7 @@ function App(): JSX.Element {
         <header className="bg-green-900 h-16 grow-0 flex items-center mb-12 px-[88px]">
           <h1 className="text-3xl font-bold">Clipper</h1>
         </header>
-        <div className="flex flex-col grow-1 bg-gray-800 w-full h-full mx-auto">
+        <div className="flex flex-col grow bg-gray-800 w-full h-full mx-auto">
           <div className={`flex flex-col grow ${marginClass}`}>
             <div className="flex grow-0 h-8 pt-4 pb-2 items-center space-x-2 text-white">
               <span className="text-gray-300">{mediaSet.author}</span>
@@ -422,6 +441,10 @@ function App(): JSX.Element {
               >
                 <ExternalLinkIcon className="h-6 w-6 text-gray-500 hover:text-gray-200" />
               </a>
+              <span className="flex grow justify-end text-gray-500">
+                <ClockIcon className="h-5 w-5 mr-1 mt-0.5" />
+                {durationString()}
+              </span>
             </div>
             <ControlBar
               playState={playState}
@@ -429,8 +452,10 @@ function App(): JSX.Element {
               onClip={handleClip}
               onZoomIn={handleZoomIn}
               onZoomOut={handleZoomOut}
+              downloadClipEnabled={selection.start != selection.end}
             />
 
+            <div className="w-full bg-gray-600 h-6"></div>
             <Overview
               peaks={overviewPeaks}
               mediaSet={mediaSet}

frontend/src/ControlBar.tsx

@@ -16,16 +16,18 @@ interface Props {
   onClip: () => void;
   onZoomIn: () => void;
   onZoomOut: () => void;
+  downloadClipEnabled: boolean;
 }
 
 const ControlBar: React.FC<Props> = React.memo((props: Props) => {
   const buttonStyle =
     'bg-gray-700 hover:bg-gray-600 text-white font-bold py-2 px-4 rounded';
 
-  const largeButtonStyle =
+  const downloadButtonStyle = props.downloadClipEnabled
-    'bg-green-700 hover:bg-green-600 text-white font-bold py-2 px-4 rounded absolute right-0';
+    ? 'bg-green-700 hover:bg-green-600 text-white font-bold py-2 px-4 rounded absolute right-0'
+    : 'bg-gray-700 hover:cursor-not-allowed text-gray-500 font-bold py-2 px-4 rounded absolute right-0';
 
-  const iconStyle = 'inline h-6 w-6 text-white-500';
+  const iconStyle = 'inline h-7 w-7 text-white-500';
 
   const playPauseComponent =
     props.playState == PlayState.Playing ? (
@@ -34,6 +36,12 @@ const ControlBar: React.FC<Props> = React.memo((props: Props) => {
       <PlayIcon className={iconStyle} />
     );
 
+  const handleClip = () => {
+    if (props.downloadClipEnabled) {
+      props.onClip();
+    }
+  };
+
   // Detect if the space bar has been used to trigger this event, and ignore
   // it if so. This conflicts with the player interface.
   const filterMouseEvent = (evt: React.MouseEvent, cb: () => void) => {
@@ -71,11 +79,11 @@ const ControlBar: React.FC<Props> = React.memo((props: Props) => {
           <ZoomOutIcon className={iconStyle} />
         </button>
         <button
-          className={largeButtonStyle}
+          className={downloadButtonStyle}
-          onClick={(evt) => filterMouseEvent(evt, props.onClip)}
+          onClick={(evt) => filterMouseEvent(evt, handleClip)}
         >
           <CloudDownloadIcon className={`${iconStyle} mr-2`} />
-          Download clip
+          Download clip as MP3
         </button>
       </div>
     </>

frontend/src/HudCanvas.tsx

@@ -136,8 +136,8 @@ export const HudCanvas: React.FC<Props> = ({
       ctx.strokeStyle = positionStrokeStyle;
       ctx.lineWidth = positionLineWidth;
       ctx.moveTo(position, 0);
-      ctx.lineWidth = 4;
+      ctx.lineWidth = position == 0 ? 8 : 4;
-      ctx.lineTo(position, canvas.height - 4);
+      ctx.lineTo(position, canvas.height);
       ctx.stroke();
     });
   }, [selection, newSelection, position]);

frontend/src/Overview.tsx

@@ -77,7 +77,7 @@ export const Overview: React.FC<Props> = ({
 
   return (
     <>
-      <div className={`relative grow-0 h-[80px]`}>
+      <div className={`relative grow-0 h-16`}>
         <WaveformCanvas
           peaks={peaks}
           channels={mediaSet.audioChannels}

frontend/src/SeekBar.tsx

@@ -45,7 +45,7 @@ export const SeekBar: React.FC<Props> = ({
     canvas.width = canvas.height * (canvas.clientWidth / canvas.clientHeight);
 
     // background
-    ctx.fillStyle = '#444444';
+    ctx.fillStyle = 'transparent';
     ctx.fillRect(0, 0, canvas.width, canvas.height);
 
     // seek bar
@@ -119,7 +119,7 @@ export const SeekBar: React.FC<Props> = ({
   return (
     <>
       <canvas
-        className={`w-full h-[30px] mx-0 my-auto ${cursor}`}
+        className={`w-full bg-gray-700 h-10 mx-0 my-auto ${cursor}`}
         ref={canvasRef}
         width={LogicalWidth}
         height={LogicalHeight}