Gets or sets the keyboard modifier callback
Object.defineProperty(AnnPlatformCallbacks.prototype, 'checkModifier',
get: function(),
set: function(value)
)
checkModifier: AnnCheckModifierCallback;
The keyboard modifier callback. The default value is null.
This callback is used by AnnAutomation to check whether the Control, Alt or Shift keys are currently pressed to perform certain operations such as multi-selection of objects.
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