Hammerspoon – 在舊的macOS自製快捷鍵實現並排視窗功能 Make your own shortcuts on Window Tiling on old macOS by Hammerspoon

macOS 15 起，蘋果提供了新的 Window Tiling (並排視窗) 功能，Setting 中也可以自行設定快捷鍵。然而這功能 Windows很久以前就有了，所以很多使用者在舊的 macOS 就會使用 Spectacle 之類的 app 來實現並排視窗。如果你是 macOS 14 以下的使用者，不想升級至 macOS 15，你也可以利用 Hammerspoon 來實作這個便利的功能哦。

延伸閱讀：
– Hammerspoon – 轉換映射 MacBook 鍵盤按鍵配置

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它的邏輯很清楚簡單，首先 bind 快捷鍵，接著抓取 active 中的視窗 (使用中) 計算尺吋，再計算 desktop / screen 的尺吋後，重新放置視窗的位置

local hotkey = require "hs.hotkey"
local window = require "hs.window"

-- Tile active window to left half
hotkey.bind({"cmd", "alt", "ctrl"}, "Left", function()
  local win = window.focusedWindow()
  if not win then return end
  local screen = win:screen()
  local frame = screen:frame()
  frame.w = frame.w / 2
  frame.h = frame.h
  frame.x = frame.x
  frame.y = frame.y
  win:setFrame(frame)
end)

-- Tile active window to right half
hotkey.bind({"cmd", "alt", "ctrl"}, "Right", function()
  local win = window.focusedWindow()
  if not win then return end
  local screen = win:screen()
  local frame = screen:frame()
  frame.w = frame.w / 2
  frame.h = frame.h
  frame.x = frame.x + frame.w
  frame.y = frame.y
  win:setFrame(frame)
end)

-- Tile active window to top half
hotkey.bind({"cmd", "alt", "ctrl"}, "Up", function()
  local win = window.focusedWindow()
  if not win then return end
  local screen = win:screen()
  local frame = screen:frame()
  frame.w = frame.w
  frame.h = frame.h / 2
  frame.x = frame.x
  frame.y = frame.y
  win:setFrame(frame)
end)

-- Tile active window to bottom half
hotkey.bind({"cmd", "alt", "ctrl"}, "Down", function()
  local win = window.focusedWindow()
  if not win then return end
  local screen = win:screen()
  local frame = screen:frame()
  frame.w = frame.w
  frame.h = frame.h / 2
  frame.x = frame.x
  frame.y = frame.y + frame.h
  win:setFrame(frame)
end)

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