feat(app): open multiple files from the Open dialog (#552)

- Open multiple selected design files in separate tabs.\n- Support desktop, File System Access, and fallback pickers.\n- Continue opening later selections when one file fails.

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Added
 
+- Open multiple selected design files in separate tabs.
 - Add deterministic two-browser collaboration coverage for bidirectional edits, awareness, departure cleanup, partitioned-peer convergence, and reconnect synchronization without public network dependencies. (#530)
 - Import, render, edit, resize, select, and export Figma text-on-path layers while preserving their curved glyph layout.
 

src/app/shell/menu/files.ts

@@ -2,19 +2,24 @@ import { useFileDialog } from '@vueuse/core'
 
 import { setOpenPencilOpenFileHandler } from '@/app/browser-bridge'
 import { resolveBrowserFileURL } from '@/app/document/io/browser'
+import { toast } from '@/app/shell/ui'
 import { openFileInNewTab } from '@/app/tabs'
 import { isTauri } from '@/app/tauri/env'
 import { IS_BROWSER } from '@/constants'
 
 const fileDialog = useFileDialog({
   accept: '.fig,.pen,.html,.htm,.xhtml',
-  multiple: false,
+  multiple: true,
   reset: true
 })
 
 fileDialog.onChange((files) => {
-  const file = files?.[0]
-  if (file) void openFileInNewTab(file)
+  if (!files) return
+  void openDesignFileBatch(
+    files,
+    (file) => file.name,
+    (file) => openFileInNewTab(file)
+  )
 })
 
 if (IS_BROWSER && 'window' in globalThis) {
@@ -28,19 +33,37 @@ if (IS_BROWSER && 'window' in globalThis) {
   })
 }
 
+export async function openDesignFileBatch<T>(
+  items: Iterable<T>,
+  displayName: (item: T) => string,
+  openItem: (item: T) => Promise<void>
+): Promise<void> {
+  for (const item of items) {
+    try {
+      await openItem(item)
+    } catch (error) {
+      const name = displayName(item)
+      const detail = error instanceof Error ? error.message : String(error)
+      console.error(`Failed to open ${name}:`, error)
+      toast.error(`Failed to open ${name}: ${detail}`)
+    }
+  }
+}
+
 export async function readTauriDesignFile(path: string): Promise<File> {
   const { readFile } = await import('@tauri-apps/plugin-fs')
   const bytes = await readFile(path)
   return new File([bytes], path.split('/').pop() ?? 'file.fig')
 }
 
-export async function chooseTauriOpenPath(): Promise<string | null> {
+export async function chooseTauriOpenPaths(): Promise<string[]> {
   const { open } = await import('@tauri-apps/plugin-dialog')
-  const path = await open({
+  const paths = await open({
     filters: [{ name: 'Design file', extensions: ['fig', 'pen', 'html', 'htm', 'xhtml'] }],
-    multiple: false
+    multiple: true
   })
-  return typeof path === 'string' ? path : null
+  if (!paths) return []
+  return typeof paths === 'string' ? [paths] : paths
 }
 
 export async function openFileFromPath(path: string) {
@@ -51,15 +74,15 @@ export async function openFileFromPath(path: string) {
 
 export async function openFileDialog() {
   if (isTauri()) {
-    const path = await chooseTauriOpenPath()
-    if (!path) return
-    await openFileFromPath(path)
+    const paths = await chooseTauriOpenPaths()
+    await openDesignFileBatch(paths, (path) => path.split(/[/\\]/).pop() ?? path, openFileFromPath)
     return
   }
 
   if (window.showOpenFilePicker) {
     try {
-      const [handle] = await window.showOpenFilePicker({
+      const handles = await window.showOpenFilePicker({
+        multiple: true,
         types: [
           {
             description: 'Design file',
@@ -73,8 +96,14 @@ export async function openFileDialog() {
           }
         ]
       })
-      const file = await handle.getFile()
-      await openFileInNewTab(file, handle)
+      await openDesignFileBatch(
+        handles,
+        (handle) => handle.name,
+        async (handle) => {
+          const file = await handle.getFile()
+          await openFileInNewTab(file, handle)
+        }
+      )
       return
     } catch (e) {
       if ((e as Error).name === 'AbortError') return

src/global.d.ts

@@ -14,6 +14,7 @@ declare global {
   }
 
   interface FilePickerOptions {
+    multiple?: boolean
     types?: FilePickerAcceptType[]
     suggestedName?: string
   }

tests/engine/app/shell/menu/file-batch.test.ts

@@ -0,0 +1,41 @@
+import { afterEach, describe, expect, mock, test } from 'bun:test'
+
+import { openDesignFileBatch } from '@/app/shell/menu/files'
+import { toast } from '@/app/shell/ui'
+
+afterEach(() => {
+  toast.toasts.value = []
+})
+
+describe('openDesignFileBatch', () => {
+  test('opens selected files sequentially in selection order', async () => {
+    const opened: string[] = []
+    const openItem = mock(async (name: string) => {
+      opened.push(name)
+    })
+
+    await openDesignFileBatch(['first.fig', 'second.pen'], (name) => name, openItem)
+
+    expect(opened).toEqual(['first.fig', 'second.pen'])
+    expect(openItem).toHaveBeenCalledTimes(2)
+  })
+
+  test('reports one failed file and continues opening later selections', async () => {
+    const opened: string[] = []
+    const openItem = mock(async (name: string) => {
+      opened.push(name)
+      if (name === 'broken.fig') throw new Error('Invalid FIG container')
+    })
+
+    await expect(
+      openDesignFileBatch(['first.fig', 'broken.fig', 'last.pen'], (name) => name, openItem)
+    ).resolves.toBeUndefined()
+
+    expect(opened).toEqual(['first.fig', 'broken.fig', 'last.pen'])
+    expect(toast.toasts.value).toHaveLength(1)
+    expect(toast.toasts.value[0]).toMatchObject({
+      message: 'Failed to open broken.fig: Invalid FIG container',
+      variant: 'error'
+    })
+  })
+})

tests/engine/tauri/file-actions.test.ts

@@ -2,7 +2,7 @@ import { afterEach, describe, expect, test } from 'bun:test'
 
 import { saveExportedFile } from '@/app/document/export/files'
 import { watchTauriFile } from '@/app/document/io/watch-targets'
-import { chooseTauriOpenPath, readTauriDesignFile } from '@/app/shell/menu/files'
+import { chooseTauriOpenPaths, readTauriDesignFile } from '@/app/shell/menu/files'
 
 import { clearTauriMocks, mockTauriIPC } from '#tests/helpers/tauri/mocks'
 
@@ -12,19 +12,19 @@ afterEach(async () => {
 })
 
 describe('Tauri file actions', () => {
-  test('chooses a design file through plugin-dialog', async () => {
+  test('chooses multiple design files through plugin-dialog', async () => {
     await mockTauriIPC((cmd, args) => {
       expect(cmd).toBe('plugin:dialog|open')
       expect(args).toEqual({
         options: {
           filters: [{ name: 'Design file', extensions: ['fig', 'pen', 'html', 'htm', 'xhtml'] }],
-          multiple: false
+          multiple: true
         }
       })
-      return '/tmp/design.fig'
+      return ['/tmp/design.fig', '/tmp/design.pen']
     })
 
-    await expect(chooseTauriOpenPath()).resolves.toBe('/tmp/design.fig')
+    await expect(chooseTauriOpenPaths()).resolves.toEqual(['/tmp/design.fig', '/tmp/design.pen'])
   })
 
   test('reads a Tauri design file into a File object', async () => {