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IUIAnimationTimerEventHandler::OnPreUpdate method

Handles events that occur before an animation update begins.

Syntax

C++


HRESULT OnPreUpdate();

Parameters

This method has no parameters.

Return value

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

Remarks

For each tick, a timer calls the following sequence of methods:

IUIAnimationTimerEventHandler::OnPreUpdate
IUIAnimationTimerUpdateHandler::OnUpdate
IUIAnimationTimerEventHandler::OnPostUpdate

OnPreUpdate and OnPostUpdate are called on the IUIAnimationTimerEventHandler registered with the IUIAnimationTimer::SetTimerEventHandler method. OnUpdate is called on the IUIAnimationTimerUpdateHandler registered with the IUIAnimationTimer::SetTimerUpdateHandler 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