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Defines methods for handling status and update events for the viewport.
Note When implementing a Direct Manipulation object, ensure that the IUnknown implementation supports multithreading through thread-safe reference counting. For more information, see InterlockedIncrement and InterlockedDecrement.
Inheritance
The IDirectManipulationViewportEventHandler interface inherits from the IUnknown interface. IDirectManipulationViewportEventHandler also has these types of members:
Methods
The IDirectManipulationViewportEventHandler interface has these methods.
| IDirectManipulationViewportEventHandler::OnContentUpdated Called when content inside a viewport is updated. |
| IDirectManipulationViewportEventHandler::OnViewportStatusChanged Called when the status of a viewport changes. |
| IDirectManipulationViewportEventHandler::OnViewportUpdated Called after all content in the viewport has been updated. |
Remarks
Client apps implement this handler to receive status and update events for viewports. Use AddEventHandler to set the handler for a viewport. Each viewport can have more than one handler.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 8 [desktop apps only] |
| Minimum supported server | Windows Server 2012 [desktop apps only] |
| Target Platform | Windows |
| Header | directmanipulation.h |