refactor(keyboard): remove input restore fallback logic

src/app/chat/components/chat-input-bar.tsx

@@ -28,11 +28,7 @@ export function ChatInputBar({ disabled = false }: ChatInputBarProps) {
 
   useKeyboardHeight({
     targetRef: textareaRef,
-    containerRef: barRef,
     active: isFocused,
-    onKeyboardDismiss: () => {
-      setIsFocused(false);
-    },
   });
 
   const handleInputChange = (value: string) => {

src/hooks/use-keyboard-height/constants.ts

@@ -4,6 +4,5 @@ export const FOCUS_GAP_PX = 14;
 export const FALLBACK_INPUT_LIFT_PX = 320;
 export const KEYBOARD_VISIBLE_THRESHOLD_PX = 80;
 export const KEYBOARD_VISIBLE_RATIO = 0.82;
-export const KEYBOARD_RELEASE_GRACE_MS = 900;
 export const KEYBOARD_MEASURE_DELAYS_MS = [0, 100, 250, 500];
 export const KEYBOARD_POLL_INTERVAL_MS = 300;

src/hooks/use-keyboard-height/index.ts

@@ -10,9 +10,9 @@
  *   - 非目标 Android Facebook IAB 设备：完全不生效。
  *   - focus 后短期多次测量输入框是否被 visibleViewport 遮挡。
  *   - 若 viewport 没有可靠变化，则使用固定 fallback 抬升。
- *   - 聚焦期间轻量轮询；一旦检测到 viewport 恢复，主动 blur 并清除抬升。
+ *   - 聚焦期间轻量轮询，持续保持输入框避让。
  */
-import { useEffect, useRef } from "react";
+import { useEffect } from "react";
 
 import { Logger } from "@/utils";
 
@@ -21,7 +21,6 @@ import {
   FOCUS_GAP_PX,
   KEYBOARD_MEASURE_DELAYS_MS,
   KEYBOARD_POLL_INTERVAL_MS,
-  KEYBOARD_RELEASE_GRACE_MS,
   KEYBOARD_VISIBLE_RATIO,
   KEYBOARD_VISIBLE_THRESHOLD_PX,
 } from "./constants";
@@ -33,10 +32,7 @@ import {
   getKeyboardAdaptEnvironment,
   shouldEnableKeyboardAdaptation,
 } from "./environment";
-import {
+import { isKeyboardTargetActive } from "./keyboard-target";
-  blurKeyboardTarget,
-  isKeyboardTargetActive,
-} from "./keyboard-target";
 import type { UseKeyboardHeightOptions } from "./types";
 
 const log = new Logger("HooksUseKeyboardHeight");
@@ -51,16 +47,8 @@ interface KeyboardSnapshot {
 
 export function useKeyboardHeight({
   targetRef,
-  containerRef,
   active = false,
-  onKeyboardDismiss,
 }: UseKeyboardHeightOptions = {}): void {
-  const onKeyboardDismissRef = useRef(onKeyboardDismiss);
-
-  useEffect(() => {
-    onKeyboardDismissRef.current = onKeyboardDismiss;
-  }, [onKeyboardDismiss]);
-
   useEffect(() => {
     if (typeof window === "undefined") return;
 
@@ -77,10 +65,7 @@ export function useKeyboardHeight({
     let rafId: number | null = null;
     let pollId: number | null = null;
     let timeoutIds: number[] = [];
-    let released = false;
-    let keyboardWasDetected = false;
     let lastInputLift = -1;
-    const focusedAt = active ? performance.now() : 0;
 
     log.debug("[keyboard] environment", environment);
 
@@ -107,39 +92,18 @@ export function useKeyboardHeight({
       });
     };
 
-    const release = (reason: string) => {
-      if (released) return;
-      released = true;
-      clearTimers();
-      applyLift(0, reason);
-      blurKeyboardTarget(targetRef?.current);
-      onKeyboardDismissRef.current?.();
-      log.debug("[keyboard] released", {
-        reason,
-        snapshot: formatSnapshot(readKeyboardSnapshot()),
-      });
-    };
-
     const measure = (reason: string) => {
       rafId = null;
 
       const target = targetRef?.current;
       const activeNow = isKeyboardTargetActive(target, active);
       const snapshot = readKeyboardSnapshot();
-      if (snapshot.keyboardVisible) keyboardWasDetected = true;
 
       if (!activeNow) {
-        release("target-inactive");
+        log.debug("[keyboard] skip inactive target", {
-        return;
+          reason,
-      }
+          snapshot: formatSnapshot(snapshot),
-
+        });
-      const focusedFor = focusedAt > 0 ? performance.now() - focusedAt : 0;
-      if (
-        keyboardWasDetected &&
-        !snapshot.keyboardVisible &&
-        focusedFor >= KEYBOARD_RELEASE_GRACE_MS
-      ) {
-        release("viewport-restored");
         return;
       }
 
@@ -163,26 +127,7 @@ export function useKeyboardHeight({
       scheduleMeasure("viewport-signal");
     };
 
-    const handleFocusOut = () => {
-      release("focusout");
-    };
-
-    const handlePointerDown = (event: PointerEvent | TouchEvent) => {
-      const target = targetRef?.current;
-      const container = containerRef?.current;
-      if (event.target instanceof Node && container?.contains(event.target)) {
-        log.debug("[keyboard] keep active for input container tap", {
-          snapshot: formatSnapshot(readKeyboardSnapshot()),
-        });
-        return;
-      }
-      if (!target || event.target === target) return;
-      if (event.target instanceof Node && target.contains(event.target)) return;
-      release("outside-interaction");
-    };
-
     if (!active) {
-      release("react-inactive");
       return;
     }
 
@@ -191,11 +136,7 @@ export function useKeyboardHeight({
     visualViewport?.addEventListener("scroll", handleViewportSignal);
     window.addEventListener("resize", handleViewportSignal);
     window.addEventListener("orientationchange", handleViewportSignal);
-    window.addEventListener("focusout", handleFocusOut);
-    window.addEventListener("blur", handleFocusOut);
     document.addEventListener("visibilitychange", handleViewportSignal);
-    document.addEventListener("pointerdown", handlePointerDown, true);
-    document.addEventListener("touchstart", handlePointerDown, true);
 
     scheduleInitialMeasures();
     pollId = window.setInterval(
@@ -210,18 +151,10 @@ export function useKeyboardHeight({
       visualViewport?.removeEventListener("scroll", handleViewportSignal);
       window.removeEventListener("resize", handleViewportSignal);
       window.removeEventListener("orientationchange", handleViewportSignal);
-      window.removeEventListener("focusout", handleFocusOut);
-      window.removeEventListener("blur", handleFocusOut);
       document.removeEventListener("visibilitychange", handleViewportSignal);
-      document.removeEventListener("pointerdown", handlePointerDown, true);
-      document.removeEventListener("touchstart", handlePointerDown, true);
       resetInputLiftVar();
     };
-  }, [
+  }, [active, targetRef]);
-    active,
-    containerRef,
-    targetRef,
-  ]);
 }
 
 function readKeyboardSnapshot(): KeyboardSnapshot {

src/hooks/use-keyboard-height/keyboard-target.ts

@@ -4,23 +4,3 @@ export function isKeyboardTargetActive(
 ): boolean {
   return reactActive || (target != null && document.activeElement === target);
 }
-
-export function blurKeyboardTarget(
-  target: HTMLElement | null | undefined,
-): void {
-  if (!target || document.activeElement !== target) return;
-  target.blur();
-}
-
-export function getActiveElementTag(): string | null {
-  const activeElement = document.activeElement;
-  if (!activeElement) return null;
-
-  const id = activeElement.id ? `#${activeElement.id}` : "";
-  const className =
-    typeof activeElement.className === "string" && activeElement.className
-      ? `.${activeElement.className.split(/\s+/).filter(Boolean).join(".")}`
-      : "";
-
-  return `${activeElement.tagName.toLowerCase()}${id}${className}`;
-}

src/hooks/use-keyboard-height/types.ts

@@ -2,9 +2,7 @@ import type { RefObject } from "react";
 
 export interface UseKeyboardHeightOptions {
   targetRef?: RefObject<HTMLElement | null>;
-  containerRef?: RefObject<HTMLElement | null>;
   active?: boolean;
-  onKeyboardDismiss?: () => void;
 }
 
 export interface KeyboardAdaptEnvironment {