IViewObject2
The IViewObject2
interface is an extension to the IViewObject1VLFPYP 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
|
IUnknown Methods |
Description |
|
QueryInterface |
Returns
pointers to supported interfaces. |
|
AddRef |
Increments
reference count. |
|
Release |
Decrements
reference count. |
|
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. |