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ControlActive

evaluates to act if a control that affects act is actively being used, and to norm otherwise.

ControlActive can be used to switch between a faster computation to be done while controls like sliders are being moved, and a slower computation to be done once the controls are released.

ControlActive can also be used to trigger evaluation of norm when controls are released.

ControlActive is effectively equivalent to If[$ControlActiveSetting, act, norm].

Change the display while controls are being used:

Out[1]=

The arguments of ControlActive can be any expression:

Use ControlActive to switch between a low-resolution and a high-resolution version:

Only emit a sound when the manipulator is not actively used:

Use a lower sampling when actively manipulating:

By using the second argument of Dynamic, you can get an effect similar to ControlActive:

Plot functions effectively use ControlActive for the PerformanceGoal setting:

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