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IUIAnimationVariable::SetVariableChangeHandler method

Specifies a variable change handler. This handler is notified of changes to the value of the animation variable.

Syntax


HRESULT SetVariableChangeHandler(
  [in, optional] IUIAnimationVariableChangeHandler *handler
);

Parameters

handler [in, optional]

A variable change handler. The specified object must implement the IUIAnimationVariableChangeHandler interface or be NULL. See Remarks.

Return value

If the method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code. See Windows Animation Error Codes for a list of error codes.

Remarks

Passing NULL for the handler parameter causes Windows Animation to release its reference to any handler object you passed in earlier. This technique can be essential for breaking reference cycles without having to call the IUIAnimationManager::Shutdown method.

Requirements

Minimum supported client

Windows 7, Windows Vista and Platform Update for Windows Vista [desktop apps | Windows Store apps]

Minimum supported server

None supported

Header

UIAnimation.h

IDL

UIAnimation.idl

DLL

UIAnimation.dll

See also

IUIAnimationVariable
IUIAnimationVariableChangeHandler
IUIAnimationVariable::SetVariableIntegerChangeHandler

 

 

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