feat(chat-sdk/chatitem): 消息支持导出图表图片 (#1937)

webapp/packages/chat-sdk/src/hooks/index.ts

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+export * from './useMethodRegister';
+export * from './useComposing';
+export * from './useExportByEcharts';

webapp/packages/chat-sdk/src/hooks/useExportByEcharts.ts

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+import { message } from 'antd';
+import { ECharts } from 'echarts';
+
+export interface ExportByEchartsProps {
+  instanceRef: React.MutableRefObject<ECharts | undefined>;
+  question: string;
+  options?: Parameters<ECharts['getConnectedDataURL']>[0];
+}
+
+export const useExportByEcharts = ({ instanceRef, question, options }: ExportByEchartsProps) => {
+  const handleSaveAsImage = () => {
+    if (instanceRef.current) {
+      return instanceRef.current.getConnectedDataURL({
+        type: 'png',
+        pixelRatio: 2,
+        backgroundColor: '#fff',
+        excludeComponents: ['toolbox'],
+        ...options,
+      });
+    }
+  };
+
+  const downloadImage = (url: string) => {
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = `${question}.png`;
+    a.click();
+  };
+
+  const downloadChartAsImage = () => {
+    const url = handleSaveAsImage();
+    if (url) {
+      downloadImage(url);
+      message.success('导出图片成功');
+    } else {
+      message.error('该条消息暂不支持导出图片');
+    }
+  };
+
+  return { downloadChartAsImage };
+};

webapp/packages/chat-sdk/src/hooks/useMethodRegister.ts

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+import { useCallback, useRef } from 'react';
+
+export const useMethodRegister = (fallback?: (...args: any[]) => any) => {
+  const methodStore = useRef<Map<string, (...args: any[]) => any>>(new Map());
+
+  const register = useCallback<(key: string, method: (...args: any[]) => any) => any>(
+    (key, method) => {
+      methodStore.current.set(key, method);
+    },
+    [methodStore]
+  );
+
+  const call = useCallback<(key: string, ...args: any[]) => any>(
+    (key, ...args) => {
+      const method = methodStore.current.get(key);
+      if (method) {
+        return method(...args);
+      }
+      return fallback?.(...args);
+    },
+    [methodStore]
+  );
+
+  return { register, call };
+};