feat(chat): 聊天滚动条美化 + Markdown 增强 — OverlayScrollbars/CodeHighlighter/代码复制/表格样式

tests/web/hooks/use-chat-scroll.test.ts

@@ -5,6 +5,14 @@ import { describe, expect, mock, test } from "bun:test";
 
 import { useChatScroll } from "../../../src/web/consoles/workbench/components/chat/use-chat-scroll";
 
+interface HookProps {
+  loadingHistory: boolean;
+  messages: UIMessage[];
+  scrollRef: React.RefObject<HTMLDivElement | null>;
+  status: string;
+  viewportElement: HTMLDivElement | null;
+}
+
 interface MockedElement {
   addEventListener: ReturnType<typeof mock>;
   clientHeight: number;
@@ -14,12 +22,12 @@ interface MockedElement {
   scrollTop: number;
 }
 
-function asHTMLElement(el: MockedElement): HTMLElement {
-  return el as unknown as HTMLElement;
+function asRef(el: MockedElement): React.RefObject<HTMLDivElement | null> {
+  return { current: el as unknown as HTMLDivElement };
 }
 
-function asRef(el: MockedElement): React.RefObject<HTMLElement | null> {
-  return { current: asHTMLElement(el) };
+function asViewport(el: MockedElement): HTMLDivElement {
+  return el as unknown as HTMLDivElement;
 }
 
 function createScrollElement(overrides: Partial<MockedElement> = {}): MockedElement {
@@ -38,20 +46,14 @@ describe("useChatScroll", () => {
   test("在底部附近时自动滚动", () => {
     const el = createScrollElement({ scrollHeight: 1000, scrollTop: 920 });
     const scrollRef = asRef(el);
+    const viewportElement = asViewport(el);
     const messages: UIMessage[] = [{ id: "1", parts: [], role: "user" }] as UIMessage[];
 
     const { rerender } = renderHook(
-      ({
-        messages,
-        scrollRef,
-        status,
-      }: {
-        messages: UIMessage[];
-        scrollRef: React.RefObject<HTMLElement | null>;
-        status: string;
-      }) => useChatScroll({ messages, scrollRef, status }),
+      ({ loadingHistory, messages, scrollRef, status, viewportElement }: HookProps) =>
+        useChatScroll({ loadingHistory, messages, scrollRef, status, viewportElement }),
       {
-        initialProps: { messages, scrollRef, status: "streaming" },
+        initialProps: { loadingHistory: false, messages, scrollRef, status: "streaming", viewportElement },
       },
     );
 
@@ -60,7 +62,7 @@ describe("useChatScroll", () => {
       { id: "2", parts: [], role: "assistant" },
     ] as UIMessage[];
 
-    rerender({ messages: newMessages, scrollRef, status: "streaming" });
+    rerender({ loadingHistory: false, messages: newMessages, scrollRef, status: "streaming", viewportElement });
 
     expect(el.scrollTo).toHaveBeenCalled();
   });
@@ -68,20 +70,14 @@ describe("useChatScroll", () => {
   test("不在底部时不自动滚动", () => {
     const el = createScrollElement({ scrollHeight: 1000, scrollTop: 200 });
     const scrollRef = asRef(el);
+    const viewportElement = asViewport(el);
     const messages: UIMessage[] = [{ id: "1", parts: [], role: "user" }] as UIMessage[];
 
     const { rerender } = renderHook(
-      ({
-        messages,
-        scrollRef,
-        status,
-      }: {
-        messages: UIMessage[];
-        scrollRef: React.RefObject<HTMLElement | null>;
-        status: string;
-      }) => useChatScroll({ messages, scrollRef, status }),
+      ({ loadingHistory, messages, scrollRef, status, viewportElement }: HookProps) =>
+        useChatScroll({ loadingHistory, messages, scrollRef, status, viewportElement }),
       {
-        initialProps: { messages, scrollRef, status: "streaming" },
+        initialProps: { loadingHistory: false, messages, scrollRef, status: "streaming", viewportElement },
       },
     );
 
@@ -100,32 +96,36 @@ describe("useChatScroll", () => {
       { id: "2", parts: [], role: "assistant" },
     ] as UIMessage[];
 
-    rerender({ messages: newMessages, scrollRef, status: "streaming" });
+    rerender({ loadingHistory: false, messages: newMessages, scrollRef, status: "streaming", viewportElement });
 
     const scrollToCalls = el.scrollTo.mock.calls as unknown[][];
     expect(scrollToCalls.length).toBe(0);
   });
 
-  test("scrollToBottom 使用 smooth 滚动", () => {
+  test("scrollToBottom 使用 instant 滚动", () => {
     const el = createScrollElement({ scrollHeight: 1000, scrollTop: 200 });
     const scrollRef = asRef(el);
+    const viewportElement = asViewport(el);
     const messages: UIMessage[] = [];
 
-    const { result } = renderHook(() => useChatScroll({ messages, scrollRef, status: "ready" }));
+    const { result } = renderHook(() => useChatScroll({ messages, scrollRef, status: "ready", viewportElement }));
 
     act(() => {
       result.current.scrollToBottom();
     });
 
-    expect(el.scrollTo).toHaveBeenCalledWith({ behavior: "smooth", top: 1000 });
+    expect(el.scrollTo).toHaveBeenCalledWith({ behavior: "instant", top: 1000 });
   });
 
   test("流式时使用 instant 滚动", () => {
     const el = createScrollElement({ scrollHeight: 1000, scrollTop: 920 });
     const scrollRef = asRef(el);
+    const viewportElement = asViewport(el);
     const messages: UIMessage[] = [{ id: "1", parts: [], role: "user" }] as UIMessage[];
 
-    renderHook(() => useChatScroll({ messages, scrollRef, status: "streaming" }));
+    renderHook(() =>
+      useChatScroll({ loadingHistory: false, messages, scrollRef, status: "streaming", viewportElement }),
+    );
 
     const calls = el.scrollTo.mock.calls as unknown[][];
     const instantCall = calls.find((call) => {
@@ -134,4 +134,57 @@ describe("useChatScroll", () => {
     });
     expect(instantCall).toBeTruthy();
   });
+
+  test("loadingHistory 从 true 变为 false 时强制 scrollToBottom", async () => {
+    const el = createScrollElement({ scrollHeight: 1000, scrollTop: 0 });
+    const scrollRef = asRef(el);
+    const viewportElement = asViewport(el);
+    const messages: UIMessage[] = [{ id: "1", parts: [], role: "user" }] as UIMessage[];
+
+    const { rerender } = renderHook(
+      ({ loadingHistory, messages, scrollRef, status, viewportElement }: HookProps) =>
+        useChatScroll({ loadingHistory, messages, scrollRef, status, viewportElement }),
+      {
+        initialProps: { loadingHistory: true, messages, scrollRef, status: "ready", viewportElement },
+      },
+    );
+
+    el.scrollTo.mockClear();
+
+    act(() => {
+      rerender({ loadingHistory: false, messages, scrollRef, status: "ready", viewportElement });
+    });
+
+    await act(async () => {
+      await new Promise((resolve) => setTimeout(resolve, 50));
+    });
+
+    expect(el.scrollTo).toHaveBeenCalledWith({ behavior: "instant", top: el.scrollHeight });
+  });
+
+  test("loadingHistory 不变时不触发强制滚动", () => {
+    const el = createScrollElement({ scrollHeight: 1000, scrollTop: 920 });
+    const scrollRef = asRef(el);
+    const viewportElement = asViewport(el);
+    const messages: UIMessage[] = [];
+
+    const { rerender } = renderHook(
+      ({ loadingHistory, messages, scrollRef, status, viewportElement }: HookProps) =>
+        useChatScroll({ loadingHistory, messages, scrollRef, status, viewportElement }),
+      {
+        initialProps: { loadingHistory: false, messages, scrollRef, status: "ready", viewportElement },
+      },
+    );
+
+    el.scrollTo.mockClear();
+
+    const newMessages: UIMessage[] = [{ id: "1", parts: [], role: "user" }] as UIMessage[];
+    rerender({ loadingHistory: false, messages: newMessages, scrollRef, status: "ready", viewportElement });
+
+    const instantCalls = el.scrollTo.mock.calls.filter((call: unknown[]) => {
+      const opts = call[0] as Record<string, unknown> | undefined;
+      return opts?.["behavior"] === "instant" && opts?.["top"] === el.scrollHeight;
+    });
+    expect(instantCalls.length).toBe(1);
+  });
 });