import Vue from "vue";
import FilePreview from "@/components/FilePreview/index.vue";

let instance = null;

/**
 * 全局文件预览：图片、PDF
 * @param {Array|Object} files [{ name, url }] 或单个 { name, url }
 * @param {Number} index 默认选中下标
 */
export default function previewFile(files, index = 0) {
  if (!instance) {
    const FilePreviewCtor = Vue.extend(FilePreview);
    instance = new FilePreviewCtor().$mount();
    document.body.appendChild(instance.$el);
  }
  instance.open(files, index);
}