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IViewObject2
The IViewObject2 interface is an extension to the IViewObject interface which returns the size of the drawing for a given view of an
object. You can prevent the object from being run if it isn't already running by
calling this method instead of IOleObject::GetExtent.
Like the IViewObject interface, IViewObject2 cannot be marshaled to another process. This is because device contexts are
only effective in the context of one process.
The OLE provided default implementation provides the size of the object in the
cache.
When to Implement
Object handlers and in-process servers that manage their own presentations
implement IViewObject2 for use by compound document containers.
When to Use
A container application or object handler calls the GetExtent method in the IViewObject2 interface to get the object's size from its cache.
Methods in Vtable Order
IViewObject Methods
| Description
| Draw
| Draws a representation of the object onto a device context.
| GetColorSet
| Returns the logical palette the object uses for drawing.
| Freeze
| Freezes the drawn representation of an object so it will not change until a
subsequent Unfreeze.
| Unfreeze
| Unfreezes the drawn representation of an object.
| SetAdvise
| Sets up a connection between the view object and an advise sink so that the
advise sink can receive notifications of changes in the view object.
| GetAdvise
| Returns the information on the most recent SetAdvise.
|
IViewObject2 Method
| Description
| GetExtent
| Returns the size of the view object from the cache.
|
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