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

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

@@ -0,0 +1,41 @@
+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 };
+};