$ControlActiveSetting

$ControlActiveSetting
is a symbol whose value is True if it is evaluated while a control is active, or in certain other previewing situations.

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Basic Examples  (2)Basic Examples  (2)

Detect when controls in Manipulate are being used:

Most plot functions use $PerformanceGoal to control visualization quality:

In[1]:=
Click for copyable input
Out[1]=

Hence the default behavior is effectively the following:

Introduced in 2007
(6.0)