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The idle event handler \code{onIdle} should be a function with no
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The idle event handler \code{onIdle} should be a function with no
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arguments. If the function is undefined or \code{NULL}, then R will
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arguments. If the function is undefined or \code{NULL}, then R will
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typically call a system function which (efficiently) waits for the next
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typically call a system function which (efficiently) waits for the next
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event to appear on a filehandle. Otherwise, the idle event handler will
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event to appear on a file handle. Otherwise, the idle event handler will
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be called whenever the event queue of the graphics device was found to
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be called whenever the event queue of the graphics device was found to
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be empty, i.e. in an infinite loop. This feature is intended to allow
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be empty, i.e. in an infinite loop. This feature is intended to allow
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animations to respond to user input, and could be CPU-intensive.
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animations to respond to user input, and could be CPU-intensive.
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Currently, \code{onIdle} is only implemented for \code{X11()} devices.
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Currently, \code{onIdle} is only implemented for \code{X11()} devices.
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