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GetMouseButton(<-button <-ignorePressesOverUI) ->val
Returns a boolean indicating if the specified mouse button is pressed. This returns true on any frame the mouse button is pressed.
The button argument specifies which mouse button to check. A value of 0 means the left button, 1 the right button, and 2 the middle button.
The second argument indicates whether to ignore mouse presses when the cursor is over UI. (NOT whether to ignore UI checks altogether.)
if (GetMouseButton(0 true)) Trace("Left Button Down") endif
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