feat(chat): add selection-based speech playback

src/components/chat/AgentTurn.test.tsx

@@ -0,0 +1,115 @@
+/* eslint-disable @next/next/no-img-element */
+import "@testing-library/jest-dom";
+import React from "react";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+
+import { AgentTurn } from "./AgentTurn";
+
+jest.mock("next/image", () => ({
+  __esModule: true,
+  default: (props: React.ImgHTMLAttributes<HTMLImageElement>) => (
+    <img {...props} alt={props.alt ?? ""} />
+  ),
+}));
+
+jest.mock("framer-motion", () => ({
+  AnimatePresence: ({ children }: { children: React.ReactNode }) => <>{children}</>,
+  motion: {
+    div: ({
+      children,
+      animate: _animate,
+      exit: _exit,
+      initial: _initial,
+      transition: _transition,
+      ...props
+    }: React.HTMLAttributes<HTMLDivElement> & Record<string, unknown>) => (
+      <div {...props}>{children}</div>
+    ),
+    span: ({
+      children,
+      animate: _animate,
+      transition: _transition,
+      ...props
+    }: React.HTMLAttributes<HTMLSpanElement> & Record<string, unknown>) => (
+      <span {...props}>{children}</span>
+    ),
+  },
+}));
+
+jest.mock("./AgentMarkdownBlock", () => ({
+  MarkdownBlock: ({ children }: { children: string }) => (
+    <div>{children.split(/\n+/u).map((line) => <p key={line}>{line}</p>)}</div>
+  ),
+  normalizeClipboardText: (value: string) => value.replace(/\s+$/u, ""),
+}));
+
+describe("AgentTurn speech selection", () => {
+  it("shows a floating action and reads from the selected text", async () => {
+    const content = "第一段内容。\n\n第二段内容。";
+    const speechText = "第一段内容。\n第二段内容。";
+    const onSpeak = jest.fn();
+    const removeAllRanges = jest.fn();
+
+    render(
+      <AgentTurn
+        message={{ id: "assistant-1", role: "assistant", content }}
+        isStreaming={false}
+        messageSpeechState="idle"
+        onSpeak={onSpeak}
+        onPause={jest.fn()}
+        onResume={jest.fn()}
+        onStopSpeech={jest.fn()}
+        isTtsSupported
+        onCreateBranch={jest.fn()}
+        onReplyPermission={jest.fn()}
+        onReplyQuestion={jest.fn()}
+        onRejectQuestion={jest.fn()}
+      />,
+    );
+
+    const selectedParagraph = screen.getByText("第二段内容。");
+    const selectedTextNode = selectedParagraph.firstChild as Text;
+    const range = {
+      commonAncestorContainer: selectedTextNode,
+      getBoundingClientRect: () => ({
+        width: 72,
+        height: 20,
+        top: 120,
+        right: 172,
+        bottom: 140,
+        left: 100,
+        x: 100,
+        y: 120,
+        toJSON: () => ({}),
+      }),
+    } as unknown as Range;
+    const selection = {
+      rangeCount: 1,
+      isCollapsed: false,
+      getRangeAt: () => range,
+      toString: () => "第二段",
+      removeAllRanges,
+    } as unknown as Selection;
+
+    jest.spyOn(window, "getSelection").mockReturnValue(selection);
+    jest.spyOn(window, "requestAnimationFrame").mockImplementation((callback) => {
+      callback(0);
+      return 1;
+    });
+
+    fireEvent.pointerUp(selectedParagraph);
+
+    const speechAction = await screen.findByRole("button", { name: "从这里开始朗读" });
+    fireEvent.click(speechAction);
+
+    await waitFor(() => {
+      expect(onSpeak).toHaveBeenCalledWith("assistant-1", speechText, {
+        startOffset: speechText.indexOf("第二段"),
+      });
+    });
+    expect(removeAllRanges).toHaveBeenCalledTimes(1);
+    await waitFor(() => {
+      expect(screen.queryByRole("button", { name: "从这里开始朗读" })).not.toBeInTheDocument();
+    });
+  });
+});

src/components/chat/AgentTurn.tsx

@@ -2,13 +2,16 @@
 
 import Image from "next/image";
 import React, { useMemo } from "react";
-import { AnimatePresence, motion } from "framer-motion";
+import { motion } from "framer-motion";
 import {
   Avatar,
   Box,
   CircularProgress,
+  Button,
+  Grow,
   IconButton,
   Paper,
+  Popper,
   Stack,
   Tooltip,
   Typography,
@@ -41,6 +44,48 @@ import PauseRounded from "@mui/icons-material/PauseRounded";
 import PlayArrowRounded from "@mui/icons-material/PlayArrowRounded";
 import StopRounded from "@mui/icons-material/StopRounded";
 
+const floatingActionSurfaceSx = {
+  display: "flex",
+  gap: 0.5,
+  p: 0.5,
+  borderRadius: "16px",
+  bgcolor: alpha("#fff", 0.8),
+  backdropFilter: "blur(16px)",
+  border: `1px solid ${alpha("#fff", 0.9)}`,
+  boxShadow: `0 4px 12px ${alpha("#000", 0.08)}`,
+  overflow: "hidden",
+} as const;
+
+const floatingActionTransitionTimeout = { enter: 150, exit: 120 } as const;
+const floatingIconButtonSx = {
+  width: 28,
+  height: 28,
+  color: "text.secondary",
+  "&:hover": {
+    color: "#00acc1",
+    bgcolor: alpha("#00acc1", 0.1),
+  },
+} as const;
+const floatingSpeechButtonSx = {
+  minHeight: 34,
+  px: 1.25,
+  color: "text.primary",
+  fontSize: 13,
+  fontWeight: 700,
+  letterSpacing: 0,
+  whiteSpace: "nowrap",
+  borderRadius: "12px",
+  "&:hover": {
+    bgcolor: alpha("#00acc1", 0.1),
+    color: "#00acc1",
+  },
+} as const;
+
+type SpeechSelection = {
+  startOffset: number;
+  anchorRect: DOMRect;
+};
+
 type AgentTurnProps = {
   message: Message;
   isStreaming: boolean;
@@ -180,10 +225,7 @@ export const AgentTurn = React.memo(
     const isStreamingAssistant = !isUser && !isErrorMessage && isStreaming;
     const [isHovered, setIsHovered] = React.useState(false);
     const answerContentRef = React.useRef<HTMLDivElement | null>(null);
-    const [selectedSpeechStart, setSelectedSpeechStart] = React.useState<{
-      offset: number;
-      preview: string;
-    } | null>(null);
+    const [speechSelection, setSpeechSelection] = React.useState<SpeechSelection | null>(null);
     const isProgressComplete = message.progress?.some(
       (item) => item.phase === "complete" && item.status === "completed",
     ) ?? false;
@@ -203,39 +245,94 @@ export const AgentTurn = React.memo(
       () => stripMarkdown(answerContent),
       [answerContent],
     );
-    const handleCaptureSpeechSelection = React.useCallback(() => {
+    const captureSpeechSelection = React.useCallback(() => {
+      if (!isTtsSupported || isStreamingAssistant) {
+        setSpeechSelection(null);
+        return;
+      }
+
       const selection = window.getSelection();
       const container = answerContentRef.current;
       if (!selection || selection.rangeCount === 0 || selection.isCollapsed || !container) {
+        setSpeechSelection(null);
         return;
       }
 
       const range = selection.getRangeAt(0);
       if (!container.contains(range.commonAncestorContainer)) {
+        setSpeechSelection(null);
         return;
       }
 
       const selectedText = selection.toString();
       const startOffset = findSpeechSelectionStartOffset(speechText, selectedText);
       if (startOffset === null) {
-        setSelectedSpeechStart(null);
+        setSpeechSelection(null);
         return;
       }
 
-      const preview = selectedText.replace(/\s+/g, " ").trim().slice(0, 24);
-      setSelectedSpeechStart({
-        offset: startOffset,
-        preview: preview.length === 24 ? `${preview}...` : preview,
-      });
-    }, [speechText]);
+      const anchorRect = range.getBoundingClientRect();
+      if (anchorRect.width === 0 && anchorRect.height === 0) {
+        setSpeechSelection(null);
+        return;
+      }
+
+      setSpeechSelection({ startOffset, anchorRect });
+    }, [isStreamingAssistant, isTtsSupported, speechText]);
+    const handleCaptureSpeechSelection = React.useCallback(() => {
+      window.requestAnimationFrame(captureSpeechSelection);
+    }, [captureSpeechSelection]);
     React.useEffect(() => {
-      setSelectedSpeechStart(null);
+      setSpeechSelection(null);
     }, [message.id, speechText]);
-    const handleSpeakFromCurrentStart = () => {
-      onSpeak(message.id, speechText, {
-        startOffset: selectedSpeechStart?.offset ?? 0,
-      });
+    React.useEffect(() => {
+      if (!speechSelection) return;
+
+      const closeSpeechSelection = () => setSpeechSelection(null);
+      const handleSelectionChange = () => {
+        if (window.getSelection()?.isCollapsed) {
+          closeSpeechSelection();
+        }
+      };
+      const handleKeyDown = (event: KeyboardEvent) => {
+        if (event.key === "Escape") {
+          closeSpeechSelection();
+        }
+      };
+
+      document.addEventListener("selectionchange", handleSelectionChange);
+      document.addEventListener("keydown", handleKeyDown);
+      window.addEventListener("resize", closeSpeechSelection);
+      window.addEventListener("scroll", closeSpeechSelection, true);
+
+      return () => {
+        document.removeEventListener("selectionchange", handleSelectionChange);
+        document.removeEventListener("keydown", handleKeyDown);
+        window.removeEventListener("resize", closeSpeechSelection);
+        window.removeEventListener("scroll", closeSpeechSelection, true);
+      };
+    }, [speechSelection]);
+    const handleSpeakMessage = () => {
+      onSpeak(message.id, speechText);
     };
+    const handleSpeakFromSelection = () => {
+      if (!speechSelection) return;
+
+      onSpeak(message.id, speechText, {
+        startOffset: speechSelection.startOffset,
+      });
+      window.getSelection()?.removeAllRanges();
+      setSpeechSelection(null);
+    };
+    const speechSelectionAnchor = React.useMemo(
+      () => speechSelection
+        ? {
+            getBoundingClientRect: () => speechSelection.anchorRect,
+          }
+        : null,
+      [speechSelection],
+    );
+    const isSpeechSelectionOpen = Boolean(speechSelection);
     const contentSegments: ContentSegment[] = useMemo(
       () =>
         !isUser && !isErrorMessage
@@ -385,9 +482,8 @@ export const AgentTurn = React.memo(
 
               <Box
                 ref={answerContentRef}
-                onMouseUp={handleCaptureSpeechSelection}
+                onPointerUp={handleCaptureSpeechSelection}
                 onKeyUp={handleCaptureSpeechSelection}
-                onTouchEnd={handleCaptureSpeechSelection}
                 sx={{
                   p: 1.5,
                   borderRadius: 4,
@@ -457,6 +553,43 @@ export const AgentTurn = React.memo(
                 </Stack>
               </Box>
 
+              <Popper
+                open={isSpeechSelectionOpen}
+                anchorEl={speechSelectionAnchor}
+                placement="top"
+                transition
+                modifiers={[
+                  { name: "offset", options: { offset: [0, 8] } },
+                  { name: "flip", enabled: true },
+                  { name: "preventOverflow", options: { padding: 8 } },
+                ]}
+                sx={{ zIndex: theme.zIndex.tooltip }}
+              >
+                {({ TransitionProps, placement }) => (
+                  <Grow
+                    {...TransitionProps}
+                    timeout={floatingActionTransitionTimeout}
+                    style={{
+                      transformOrigin: placement.startsWith("bottom")
+                        ? "center top"
+                        : "center bottom",
+                    }}
+                  >
+                    <Paper elevation={4} sx={floatingActionSurfaceSx}>
+                      <Button
+                        size="small"
+                        startIcon={<VolumeUpRounded sx={{ fontSize: 16 }} />}
+                        onMouseDown={(event) => event.preventDefault()}
+                        onClick={handleSpeakFromSelection}
+                        sx={floatingSpeechButtonSx}
+                      >
+                        从这里开始朗读
+                      </Button>
+                    </Paper>
+                  </Grow>
+                )}
+              </Popper>
+
               {visibleChartArtifacts.map((artifact) => (
                 <ChatInlineChart
                   key={artifact.id}
@@ -479,59 +612,49 @@ export const AgentTurn = React.memo(
               ))}
             </Stack>
 
-            <AnimatePresence>
-              {isHovered && !isStreaming && (
-                <motion.div
-                  initial={{ opacity: 0, scale: 0.9, y: 5 }}
-                  animate={{ opacity: 1, scale: 1, y: 0 }}
-                  exit={{ opacity: 0, scale: 0.9, y: 5 }}
-                  transition={{ duration: 0.15 }}
-                  style={{ position: "absolute", top: -14, right: 12, zIndex: 10 }}
-                >
-                  <Paper
-                    elevation={4}
-                    sx={{
-                      display: "flex",
-                      gap: 0.5,
-                      p: 0.5,
-                      borderRadius: "16px",
-                      bgcolor: alpha("#fff", 0.8),
-                      backdropFilter: "blur(16px)",
-                      border: `1px solid ${alpha("#fff", 0.9)}`,
-                      boxShadow: `0 4px 12px ${alpha("#000", 0.08)}`,
+            <Grow
+              in={isHovered && !isStreaming}
+              timeout={floatingActionTransitionTimeout}
+              mountOnEnter
+              unmountOnExit
+              style={{ transformOrigin: "right bottom" }}
+            >
+              <Paper
+                elevation={4}
+                sx={{
+                  ...floatingActionSurfaceSx,
+                  position: "absolute",
+                  top: -14,
+                  right: 12,
+                  zIndex: 10,
+                }}
+              >
+                <Tooltip title="复制">
+                  <IconButton
+                    size="small"
+                    aria-label="复制"
+                    onClick={() => {
+                      navigator.clipboard.writeText(
+                        normalizeClipboardText(message.content),
+                      );
                     }}
+                    sx={floatingIconButtonSx}
                   >
-                    <Tooltip title="复制">
-                      <IconButton 
-                        size="small" 
-                        aria-label="复制" 
-                        onClick={() => {
-                          navigator.clipboard.writeText(
-                            normalizeClipboardText(message.content),
-                          );
-                          // Could add a toast here
-                        }}
-                        sx={{ width: 28, height: 28, color: "text.secondary", "&:hover": { color: "#00acc1", bgcolor: alpha("#00acc1", 0.1) } }}
-                      >
-                        <ContentCopyRounded sx={{ fontSize: 16 }} />
-                      </IconButton>
-                    </Tooltip>
-                    <Tooltip title="拆分为新会话">
-                      <IconButton
-                        size="small"
-                        aria-label="拆分为新会话"
-                        onClick={() => {
-                          onCreateBranch(message.id);
-                        }}
-                        sx={{ width: 28, height: 28, color: "text.secondary", "&:hover": { color: "#00acc1", bgcolor: alpha("#00acc1", 0.1) } }}
-                      >
-                        <TbArrowsSplit2 size={16} />
-                      </IconButton>
-                    </Tooltip>
-                  </Paper>
-                </motion.div>
-              )}
-            </AnimatePresence>
+                    <ContentCopyRounded sx={{ fontSize: 16 }} />
+                  </IconButton>
+                </Tooltip>
+                <Tooltip title="拆分为新会话">
+                  <IconButton
+                    size="small"
+                    aria-label="拆分为新会话"
+                    onClick={() => onCreateBranch(message.id)}
+                    sx={floatingIconButtonSx}
+                  >
+                    <TbArrowsSplit2 size={16} />
+                  </IconButton>
+                </Tooltip>
+              </Paper>
+            </Grow>
 
           </Paper>
         </Stack>
@@ -542,8 +665,8 @@ export const AgentTurn = React.memo(
               {messageSpeechState === "idle" ? (
                 <IconButton
                   size="small"
-                  onClick={handleSpeakFromCurrentStart}
-                  aria-label={selectedSpeechStart ? "从选中位置朗读" : "朗读消息"}
+                  onClick={handleSpeakMessage}
+                  aria-label="朗读消息"
                   sx={{ color: "text.secondary", opacity: 0.68, p: 0.5 }}
                 >
                   <VolumeUpRounded sx={{ fontSize: 16 }} />