IUIAnimationTimerEventHandler::OnPreUpdate method (uianimation.h)

Handles events that occur before an animation update begins.

Syntax

HRESULT OnPreUpdate();

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

Requirement	Value
Minimum supported client	Windows 7, Windows Vista and Platform Update for Windows Vista [desktop apps | UWP apps]
Minimum supported server	None supported
Target Platform	Windows
Header	uianimation.h
DLL	UIAnimation.dll

See also

IUIAnimationTimerEventHandler

SetTimerEventHandler