Autohotkey - if left mouse button is not depressed

Looking to do something like this:

if leftmou开发者_高级运维sebutton not depressed
    some other action

Does anybody know how I would go about coding that?

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try this

GetKeyState, state, LButton 

if state = U
    some other action

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if !GetKeyState("LButton", "P")
    msgbox the left mouse button is not depressed.

GetKeyState() documentation

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I don't know anything about autohotkey, but in the event the left mouse button is pressed down, set leftMouseButtonPressed = true, and when it is released, set leftMouseButtonPressed = false, and then in the if statement, just check if leftMouseButtonPressed.