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IOleObject::SetExtent
Informs an object of how much display space its container has assigned it.
HRESULT SetExtent(
DWORD dwDrawAspect,
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| SIZEL *psizel
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| );
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Parameters
dwDrawAspect
[in] Describes which form, or "aspect," of an object is to be displayed. The
object's container obtains this value from the enumeration DVASPECT (see "FORMATETC Data Structure"). The most common aspect is DVASPECT_CONTENT, which specifies
a full rendering of the object within its container. An object can also be
rendered as an icon, a thumbnail version for display in a browsing tool, or a
print version, which displays the object as it would be rendered using the File
Print command.
psizel
[in] Specifies the size limit for the object.
Return Values
S_OK
The object has resized successfully.
E_FAIL
The object's size is fixed.
OLE_E_NOTRUNNING
The object is not running.
Comments
A container calls IOleObject::SetExtent when it needs to dictate to an embedded object the size at which it will be
displayed. Often, this call occurs in response to an end user resizing the
object window. Upon receiving the call, the object, if possible, should recompose
itself gracefully to fit the new window.
Whenever possible, a container seeks to display an object at its finest
resolution, sometimes called the object's native size. All objects, however, have a default display size specified by their
applications, and in the absence of other constraints, this is the size they will use
to display themselves. Since an object knows its optimum display size better
than does its container, the latter normally requests that size from a running
object by calling IOleObject::GetExtent. Only in cases where the container cannot accommodate the value returned by
the object does it override the object's preference by calling IOleObject::SetExtent.
Notes to Callers
You can call SetExtent on an object only when the object is running. If a container resizes an
object while an object is not running, the container should keep track of the
object's new size but defer calling IOleObject::SetExtent until a user activates the object. If the OLEMISC_RECOMPOSEONRESIZE bit is
set on an object, its container should force the object to run before calling OleObject::SetExtent.
As noted above, a container may want to delegate responsibility for setting
the size of an object's display site to the object itself, by calling IOleObject::GetExtent.
Notes to Implementors
You may want to implement this method so that your object rescales itself to
match as closely as possible the maximum space available to it in its container.
If an object's size is fixed, that is, if it cannot be set by its container, OleObject::SetExtent should return E_FAIL. This is always the case with linked objects, whose
sizes are set by their link sources, not by their containers.
See Also
IAdviseSink::OnViewChange, IOleObject::GetExtent, IViewObject2::GetExtent
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