From 971b6093054bd39bdbefbea5284b5a761917b0b2 Mon Sep 17 00:00:00 2001
From: Jaybe <master@jaybe.dev>
Date: Mon, 17 Nov 2025 01:28:51 +0900
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---
 .../Canvas.multigroup.snap.expanded.test.tsx  | 111 ++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 components/wysiwyg/Canvas.multigroup.snap.expanded.test.tsx

diff --git a/components/wysiwyg/Canvas.multigroup.snap.expanded.test.tsx b/components/wysiwyg/Canvas.multigroup.snap.expanded.test.tsx
new file mode 100644
index 0000000..7732bc7
--- /dev/null
+++ b/components/wysiwyg/Canvas.multigroup.snap.expanded.test.tsx
@@ -0,0 +1,111 @@
+import React from 'react'
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { render, screen, waitFor } from '@testing-library/react'
+import { act } from 'react'
+import { Canvas } from '@/components/wysiwyg/Canvas'
+import type { Frame } from '@/lib/wysiwyg/schema'
+
+const capture = vi.fn()
+
+type MProps = {
+  onDragStart?: () => void
+  onDrag?: (e: { left?: number; top?: number }) => void
+  onDragEnd?: () => void
+}
+
+vi.mock('react-moveable', () => {
+  const Mock = (props: Record<string, unknown>) => {
+    capture(props)
+    return <div data-testid="moveable" />
+  }
+  return { default: Mock }
+})
+
+// Base frame
+function makeFrame(): Frame {
+  return {
+    id: 'f-expand',
+    width: 500,
+    height: 400,
+    background: '#fff',
+    layers: [
+      { id: 'l1', name: 'L1', visible: true, locked: false, objects: [
+        { id: 'o1', type: 'text', x: 10, y: 10, width: 40, height: 30, rotate: 0, zIndex: 3, props: { text: 'A', fontSize: 16, color: '#000' } },
+        { id: 'o2', type: 'text', x: 80, y: 10, width: 40, height: 30, rotate: 0, zIndex: 2, props: { text: 'B', fontSize: 16, color: '#000' } },
+        { id: 'o3', type: 'text', x: 200, y: 50, width: 80, height: 30, rotate: 0, zIndex: 1, props: { text: 'C', fontSize: 16, color: '#000' } },
+      ]}
+    ]
+  }
+}
+
+describe('Canvas multi-group snap expanded', () => {
+  beforeEach(() => capture.mockReset())
+
+  it('axis independence: x-axis edge snapping does not alter y-axis center decision', async () => {
+    const frame = makeFrame()
+    render(<Canvas frame={frame} />)
+
+    // Multi select o1 + o2
+    screen.getByTestId('obj-o1').dispatchEvent(new MouseEvent('mousedown', { bubbles: true }))
+    screen.getByTestId('obj-o2').dispatchEvent(new MouseEvent('mousedown', { bubbles: true, shiftKey: true }))
+
+    await waitFor(() => expect(capture.mock.calls.length).toBeGreaterThan(0))
+    const last = capture.mock.calls.at(-1)?.[0] as MProps
+
+    await act(async () => { last.onDragStart?.() })
+    // Propose left so that group right edge aligns to o3 left edge (x-edge snap),
+    // while y stays near group original top to avoid y snapping.
+    await act(async () => { last.onDrag?.({ left: 160, top: 10 }) })
+
+    const o1 = screen.getByTestId('obj-o1') as HTMLElement
+    const o2 = screen.getByTestId('obj-o2') as HTMLElement
+
+    await waitFor(() => {
+      const l1 = parseInt(o1.style.left)
+      // x should snap near 90 (200 - groupWidth 110) with 8px grid tolerance
+      expect([88, 90, 96]).toContain(l1)
+      // y should remain aligned equally without forcing to o3 center (remain ~10 + dy)
+      const t1 = parseInt(o1.style.top)
+      const t2 = parseInt(o2.style.top)
+      expect(t1 - 10).toBe(t2 - 10)
+    })
+
+    await act(async () => { last.onDragEnd?.() })
+  })
+
+  it('threshold boundary: snaps when within 8px, does not snap when beyond 8px', async () => {
+    const frame = makeFrame()
+    render(<Canvas frame={frame} />)
+
+    // Multi select
+    screen.getByTestId('obj-o1').dispatchEvent(new MouseEvent('mousedown', { bubbles: true }))
+    screen.getByTestId('obj-o2').dispatchEvent(new MouseEvent('mousedown', { bubbles: true, shiftKey: true }))
+    await waitFor(() => expect(capture.mock.calls.length).toBeGreaterThan(0))
+    const last = capture.mock.calls.at(-1)?.[0] as MProps
+    await act(async () => { last.onDragStart?.() })
+
+    // Case A: within 8px → should snap to o3 center X
+    // group centerX=65. To reach o3 centerX=240, propose o2.left ~ 80 + (240-65) = 255
+    await act(async () => { last.onDrag?.({ left: 255, top: 10 }) })
+    const o1a = screen.getByTestId('obj-o1') as HTMLElement
+    // group centerX should be ~240 (allow grid tolerance)
+    await waitFor(() => {
+      const l1 = parseInt(o1a.style.left)
+      const groupCenter = l1 + 110 / 2 // groupWidth=110
+      expect(Math.abs(groupCenter - 240)).toBeLessThanOrEqual(8)
+    })
+
+    // Case B: beyond 8px → move slightly more than threshold on X so not snapping to center
+    // propose further by +16 (two grid steps) from the previous left
+    await act(async () => { last.onDrag?.({ left: 271, top: 10 }) })
+    const o1b = screen.getByTestId('obj-o1') as HTMLElement
+    await waitFor(() => {
+      const l1b = parseInt(o1b.style.left)
+      const groupCenterB = l1b + 110 / 2
+      // should no longer be within 8px of 240 (no snap)
+      expect(Math.abs(groupCenterB - 240)).toBeGreaterThan(8)
+    })
+
+    await act(async () => { last.onDragEnd?.() })
+  })
+})