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

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+/**
+ * @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;
+};