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* StreamingText 组件
*
* 用于显示流式输出的文本内容
* 支持打字机效果、自动滚动、进度显示
*/
import React, { memo, useEffect, useRef } from 'react';
import { ScrollView, StyleSheet } from 'react-native';
import Animated, {
useAnimatedStyle,
useSharedValue,
withRepeat,
withSequence,
withTiming,
} from 'react-native-reanimated';
import { Spinner, Text, XStack, YStack } from 'tamagui';
import { IconSymbol } from '@/src/components/ui/IconSymbol';
import { primaryScale, neutralScale, successScale } from '@/src/design-system/tokens/colors';
// ==================== 类型定义 ====================
interface StreamingTextProps {
/** 文本内容 */
content: string;
/** 是否正在流式传输 */
isStreaming: boolean;
/** 是否已完成 */
isComplete: boolean;
/** 进度 (0-100) */
progress: number;
/** 错误信息 */
error?: string | null;
}
// ==================== 子组件 ====================
/** 进度条 */
const ProgressBar = memo(function ProgressBar({ progress }: { progress: number }) {
return (
<XStack
alignItems="center"
paddingHorizontal="$4"
paddingVertical="$3"
backgroundColor={primaryScale.primary2}
gap="$2"
borderBottomWidth={1}
borderBottomColor={primaryScale.primary4}
minHeight={48}
>
<Spinner size="small" color={primaryScale.primary9} />
<Text
fontSize={13}
color={primaryScale.primary11}
fontWeight="500"
flex={1}
numberOfLines={1}
>
AI 正在分析中...
</Text>
<Text
fontSize={12}
color={primaryScale.primary9}
fontWeight="600"
minWidth={40}
textAlign="right"
>
{Math.round(progress)}%
</Text>
</XStack>
);
});
/** 完成提示 */
const CompleteBanner = memo(function CompleteBanner() {
return (
<XStack
alignItems="center"
justifyContent="center"
paddingVertical="$3"
backgroundColor={successScale.success2}
gap="$2"
borderBottomWidth={1}
borderBottomColor={successScale.success4}
minHeight={48}
>
<IconSymbol name="checkmark.circle.fill" size={16} color={successScale.success9} />
<Text fontSize={13} color={successScale.success11} fontWeight="600" numberOfLines={1}>
分析完成，报告已保存
</Text>
</XStack>
);
});
/** 错误提示 */
const ErrorBanner = memo(function ErrorBanner({ message }: { message: string }) {
return (
<XStack
alignItems="center"
paddingVertical="$3"
paddingHorizontal="$4"
backgroundColor="#FEE2E2"
gap="$2"
minHeight={48}
>
<IconSymbol name="exclamationmark.circle.fill" size={16} color="#EF4444" />
<Text fontSize={13} color="#B91C1C" fontWeight="500" flex={1} numberOfLines={2}>
{message}
</Text>
</XStack>
);
});
/** 流式光标 */
const StreamingCursor = memo(function StreamingCursor() {
const opacity = useSharedValue(1);
useEffect(() => {
opacity.value = withRepeat(
withSequence(withTiming(0, { duration: 500 }), withTiming(1, { duration: 500 })),
-1,
true
);
}, []);
const cursorStyle = useAnimatedStyle(() => ({
opacity: opacity.value,
}));
return <Animated.View style={[styles.cursor, cursorStyle]} />;
});
/** 空状态（等待开始） */
const EmptyState = memo(function EmptyState() {
return (
<YStack alignItems="center" justifyContent="center" padding="$6" flex={1}>
<Spinner size="large" color={primaryScale.primary9} />
<Text marginTop="$3" fontSize={14} color={neutralScale.neutral10} textAlign="center">
正在连接 AI 服务...
</Text>
</YStack>
);
});
// ==================== 主组件 ====================
function StreamingTextComponent({
content,
isStreaming,
isComplete,
progress,
error,
}: StreamingTextProps) {
const scrollViewRef = useRef<ScrollView>(null);
// 自动滚动到底部
useEffect(() => {
if (isStreaming && scrollViewRef.current) {
const timer = setTimeout(() => {
scrollViewRef.current?.scrollToEnd({ animated: true });
}, 100);
return () => clearTimeout(timer);
}
return undefined;
}, [content, isStreaming]);
return (
<YStack flex={1}>
{/* 顶部状态栏 */}
{isStreaming && <ProgressBar progress={progress} />}
{isComplete && !error && <CompleteBanner />}
{error && <ErrorBanner message={error} />}
{/* 内容区域 */}
<ScrollView
ref={scrollViewRef}
style={styles.scrollView}
contentContainerStyle={styles.contentContainer}
showsVerticalScrollIndicator={true}
>
{content ? (
<YStack flex={1}>
{/* 流式文本内容 */}
<Text
fontSize={14}
lineHeight={22}
color={neutralScale.neutral12}
style={{ whiteSpace: 'pre-wrap' }}
>
{content}
</Text>
{/* 流式光标 */}
{isStreaming && <StreamingCursor />}
</YStack>
) : isStreaming ? (
<EmptyState />
) : null}
</ScrollView>
</YStack>
);
}
// ==================== 样式 ====================
const styles = StyleSheet.create({
scrollView: {
flex: 1,
},
contentContainer: {
padding: 16,
paddingBottom: 32,
},
cursor: {
width: 2,
height: 18,
backgroundColor: primaryScale.primary9,
marginLeft: 2,
marginTop: 4,
borderRadius: 1,
},
});
export const StreamingText = memo(StreamingTextComponent);
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