Hotkey bind to set window to a specific size is easy & convenient to make with Hammerspoon and works nicely if you only need few sizes and use similar resolution screens, but is not ideal when constantly switching between desktop and laptop screens with different sizes & resolutions. Luckily Hammerspoon has access to the display resolutions so the script can have different settings depending on the used screen.
Example script:
function setWindowSize(w, h)
hs.window.setFrameCorrectness = true;
local win = hs.window.focusedWindow()
hs.window.animationDuration = 0
local f = win:frame()
f.h = h
f.w = w
win:setFrame(f)
end
hs.hotkey.bind({"alt"}, "d", function()
local screen = hs.screen.mainScreen()
local screenMode = screen:currentMode()
local screenWidth = screenMode.w
local win = hs.window.focusedWindow()
local f = win:frame()
local initialWidth = screenWidth == 3840 and 1500 or 1200
local initialHeight = screenWidth == 3840 and 1300 or 1000
local secondWidth = screenWidth == 3840 and 1600 or 1350
local secondHeight = screenWidth == 3840 and 1900 or 1050
if (f.w == initialWidth and f.h == initialHeight) then
setWindowSize(secondWidth, secondHeight)
else
setWindowSize(initialWidth, initialHeight)
end
end)
The hotkey bound to alt+d toggles between two window sizes and uses the secondary size if the screen’s width is not 3840 pixels. The if … else around calling setWindowSize function is not necessary, but it’s just used to have multiple sizes bound to one hotkey. Lua lacks a standard looking ternary operator, but uses the a == b and x or y syntax.