refactor: fit user message in screen

apps/client/src/common/components/fit-text/FitText.tsx

@@ -0,0 +1,63 @@
+/**
+ * Copied from
+ * https://github.com/namhong2001/react-textfit/blob/master/index.tsx
+ */
+
+import { HTMLAttributes, PropsWithChildren, useCallback, useEffect, useRef } from 'react';
+
+import { bsearch } from './fitText.utils';
+
+interface FitTextProps extends HTMLAttributes<HTMLDivElement> {
+  mode?: 'single' | 'multi';
+  min?: number; // inclusive
+  max?: number; // inclusive
+}
+
+export function FitText(props: PropsWithChildren<FitTextProps>) {
+  const { children, mode = 'multi', min = 16, max = 256, ...elementProps } = props;
+  const ref = useRef<HTMLDivElement>(null);
+
+  const isOverflown = useCallback(() => {
+    const el = ref.current;
+    if (!el) return false;
+    return el.scrollHeight > el.clientHeight || el.scrollWidth > el.clientWidth;
+  }, []);
+
+  const setFontSize = useCallback(() => {
+    const el = ref.current;
+    if (!el) return;
+
+    const originVisibility = el.style.visibility;
+
+    el.style.visibility = 'hidden';
+    const fontSize = bsearch(min, max + 1, (mid) => {
+      el.style.fontSize = `${mid}px`;
+      return !isOverflown();
+    });
+    el.style.fontSize = `${fontSize}px`;
+    el.style.visibility = originVisibility;
+  }, [isOverflown, min, max]);
+
+  useEffect(() => {
+    const el = ref.current;
+    if (!el) return;
+
+    setFontSize();
+    const observer = new ResizeObserver(setFontSize);
+    observer.observe(el);
+
+    return () => observer.disconnect();
+  }, [children, mode, setFontSize]);
+
+  return (
+    <div
+      ref={ref}
+      style={{
+        whiteSpace: mode === 'single' ? 'nowrap' : 'normal',
+      }}
+      {...elementProps}
+    >
+      {children}
+    </div>
+  );
+}

apps/client/src/common/components/fit-text/fitText.utils.ts

@@ -0,0 +1,18 @@
+/**
+ * @param low inclusive, must be true on predicate function
+ * @param high exclusive,
+ * @param predicate predicate function
+ */
+export const bsearch = (low: number, high: number, predicate: (mid: number) => boolean): number => {
+  while (low < high) {
+    const mid = Math.floor((low + high) / 2);
+    if (mid === low) break;
+
+    if (predicate(mid)) {
+      low = mid;
+    } else {
+      high = mid;
+    }
+  }
+  return low;
+};

apps/client/src/features/viewers/timer/Timer.scss

@@ -167,36 +167,28 @@
 
   .message-overlay {
     position: fixed;
-    width: 100%;
-    height: 100%;
     top: 0;
     left: 0;
     right: 0;
     bottom: 0;
-    background-color: $viewer-overlay-bg-color;
-    z-index: -1;
+    padding: 2vw;
+    background: var(--background-color-override, $viewer-background-color);
     opacity: 0;
-    transition: $viewer-transition-time;
+    transition: opacity $viewer-transition-time;
+    z-index: 2;
 
     &--active {
       opacity: 1;
-      transition: $viewer-transition-time;
-      transition-property: opacity;
-      z-index: 2;
     }
   }
 
   .message {
-    width: inherit;
-    padding: 2vw;
-    position: absolute;
-    top: 50%;
-    left: 50%;
-    color: $viewer-color;
-    transform: translate(-50%, -50%);
-    -ms-transform: translate(-50%, -50%);
-    font-size: 15vw;
-    line-height: 30vh;
+    display: grid;
+    place-content: center;
+    height: 100%;
+    width: 100%;
+
+    color: var(--color-override, $viewer-color);
     text-align: center;
     font-weight: 600;
   }

apps/client/src/features/viewers/timer/Timer.tsx

@@ -13,6 +13,7 @@ import {
 } from 'ontime-types';
 
 import { overrideStylesURL } from '../../../common/api/constants';
+import { FitText } from '../../../common/components/fit-text/FitText';
 import MultiPartProgressBar from '../../../common/components/multi-part-progress-bar/MultiPartProgressBar';
 import TitleCard from '../../../common/components/title-card/TitleCard';
 import ViewParamsEditor from '../../../common/components/view-params-editor/ViewParamsEditor';
@@ -163,7 +164,9 @@ export default function Timer(props: TimerProps) {
       <div className={showBlackout ? 'blackout blackout--active' : 'blackout'} />
       {!userOptions.hideMessage && (
         <div className={showOverlay ? 'message-overlay message-overlay--active' : 'message-overlay'}>
-          <div className={`message ${showBlinking ? 'blink' : ''}`}>{pres.text}</div>
+          <FitText mode='multi' min={32} max={256} className={`message ${showBlinking ? 'blink' : ''}`}>
+            {pres.text}
+          </FitText>
         </div>
       )}
 

apps/client/src/theme/_viewerDefs.scss

@@ -19,7 +19,6 @@ $viewer-background-color: $ui-black; // --background-color-override
 $viewer-color: rgba(white, 80%); // --color-override
 $viewer-secondary-color: rgba(white, 45%); // --secondary-color-override
 $viewer-card-bg-color: rgba(white, 7%); // --card-background-color-override
-$viewer-overlay-bg-color: rgba(black, 90%);
 $element-border-radius: 8px;
 
 // Properties related to timer