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website/src/lib/components/file-list/Selection.ts

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+import { get, writable } from "svelte/store";
+import { ListFileItem, ListRootItem, SelectionTreeType } from "./FileList";
+import { fileObservers } from "$lib/db";
+
+export const selection = writable<SelectionTreeType>(new SelectionTreeType(new ListRootItem()));
+
+export function selectAll() {
+    selection.update(($selection) => {
+        get(fileObservers).forEach((_file, fileId) => {
+            $selection.set(new ListFileItem(fileId), true);
+        });
+        return $selection;
+    });
+}