⚡️ Pro Tip: Auto Input Switch (Hammerspoon)

💡 The Problem

Have you ever moved your mouse to Windows, typed, and nothing happened (because Mac was still in Chinese IME)? This solution uses a Hammerspoon script to Auto-switch to ABC when going to Win, and restore when coming back.

1. How it Works

When DeskFlow controls Windows, it instantly teleports and locks the Mac cursor to the center of the screen. Our script detects this "teleportation":

• Going to Win: Cursor jumps from edge to center in < 0.2s -> Force switch to ABC.
• Back to Mac: Cursor leaves the center area -> Restore previous input method.

2. Installation

1. Install Hammerspoon:

   brew install --cask hammerspoon

   (Or download from Official Site)

2. Configure:

   • Open Hammerspoon -> Menu Bar Icon -> Open Config.
   • Paste the code below into init.lua.
   • Update winPosition variable (is your Win on left or right?).

3. Reload:

   • Menu Bar Icon -> Reload Config.

3. Script Code

Click to copy Lua script

-- ============================================
-- 🌉 DeskFlow 输入法智能记忆与切换脚本 
-- 功能：去 Win 自动切 ABC，回 Mac 自动恢复之前的状态
-- ============================================

-- ⚙️ 配置区域
local winPosition = "right" -- Windows 在哪边？
local abcID = "com.apple.keylayout.ABC" 

-- 📏 参数微调
local edgeZone = 10        -- 边缘判定宽度
local centerZone = 500     -- 中心判定半径 (在这个圈内都算中心)
local jumpTimeLimit = 0.2  -- 瞬移时间限制 (0.2秒内从边缘到中心才算瞬移)

-- 🔒 状态变量
local savedInputMethod = nil
local isFocusOnWin = false
local lastAtEdgeTime = 0   -- 上次出现在边缘的时间戳

-- 缓存屏幕数据
local screen = hs.screen.mainScreen()
local frame = screen:frame()
local centerX = frame.x + (frame.w / 2)
local centerY = frame.y + (frame.h / 2)

function mouseHandler()
    local pos = hs.mouse.getAbsolutePosition()
    local now = hs.timer.secondsSinceEpoch()
    
    -- 1. 检测是否在边缘
    local atEdge = false
    if winPosition == "right" then
        if pos.x >= (frame.x + frame.w - edgeZone) then atEdge = true end
    else
        if pos.x <= (frame.x + edgeZone) then atEdge = true end
    end
    
    -- 如果在边缘，更新“目击时间”
    if atEdge then
        lastAtEdgeTime = now
    end

    -- 2. 检测是否在中心
    local distToCenter = math.sqrt((pos.x - centerX)^2 + (pos.y - centerY)^2)
    local atCenter = (distToCenter < centerZone)

    -- 🚀 [去程判定]：刚才在边缘，现在突然在中心 (瞬移)
    if not isFocusOnWin and atCenter then
        -- 核心逻辑：如果从边缘到中心的时间极短，说明是 DeskFlow 干的
        if (now - lastAtEdgeTime) < jumpTimeLimit then
            -- 记录并切换
            local current = hs.keycodes.currentSourceID()
            savedInputMethod = current
            
            if current ~= abcID then
                hs.keycodes.currentSourceID(abcID)
                hs.alert.show("🚀 Win Mode", 0.5)
            end
            
            isFocusOnWin = true
        end
    end

    -- 🏠 [回程判定]：虽然在 Win 模式，但鼠标逃离了中心
    -- 逻辑：DeskFlow 锁定时会一直把鼠标按在中心，如果你能把鼠标移开，说明你回 Mac 了
    if isFocusOnWin and not atCenter then
        if savedInputMethod and savedInputMethod ~= abcID then
            hs.keycodes.currentSourceID(savedInputMethod)
            hs.alert.show("🏠 Mac Mode", 0.5)
        end
        isFocusOnWin = false
        savedInputMethod = nil
    end
end

-- 高频监听 (0.05秒一次，为了捕捉瞬移)
mouseWatcher = hs.timer.doEvery(0.05, mouseHandler)

⚠️ Note on "Fast Movement"

Since the script polls every 0.05s, moving the mouse extremely fast across the edge might cause the script to miss the "Edge State", resulting in a failure to switch.

If you find the switching unreliable, try tweaking these parameters in the script:

1. Increase Detection Zone (Recommended): Find local edgeZone = 10 and change it to a larger value (e.g., 50 or 100). This widens the "net" to catch the mouse cursor more easily.
2. Increase Polling Rate: Find hs.timer.doEvery(0.05, ...) at the bottom and change 0.05 to 0.02 or 0.01. This slightly increases CPU usage but improves precision.

---

✅ Configuration Complete & Potential Issues

Now, your key mappings are highly unified across both ends. However, in actual use, you may encounter a new pain point:

❌ Input Method Conflict: When you move your mouse to Windows to type, if the Mac is still in Chinese IME, you might be unable to type symbols (like . [ ]) correctly on Windows because the Mac intercepts and processes these keyboard signals first.

To achieve a seamless experience of "Auto-switch to English when going to Windows, and auto-restore when coming back to Mac", please proceed to the next section:

⚡️ Pro Tip: Auto Input Switch