IUIAnimationTimer::SetTimerUpdateHandler method (uianimation.h)

Specifies a timer update handler.

Syntax

HRESULT SetTimerUpdateHandler(
  [in, optional] IUIAnimationTimerUpdateHandler *updateHandler,
  [in]           UI_ANIMATION_IDLE_BEHAVIOR     idleBehavior
);

Parameters

[in, optional] updateHandler

A timer update handler, or NULL (see Remarks). The specified object must implement the IUIAnimationTimerUpdateHandler interface.

[in] idleBehavior

A member of UI_ANIMATION_IDLE_BEHAVIOR that specifies the behavior of the timer when it is idle.

Return value

If the method succeeds, it returns S_OK. If the update handler is already connected to a timer, this method returns UI_E_TIMER_CLIENT_ALREADY_CONNECTED. Otherwise, it returns an HRESULT error code. See Windows Animation Error Codes for a list of error codes.

Remarks

The timer update handler receives time updates (ticks) from the timer. The timer indicates an update by calling the IUIAnimationTimerUpdateHandler::OnUpdate
method on the specified handler.

Passing NULL for the updateHandler 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.

Examples

For an example, see Update the Animation Manager.

Requirements

See also

IUIAnimationTimer

IUIAnimationTimer::SetTimerEventHandler

IUIAnimationTimerUpdateHandler