Hides all child nodes, controls, or content of the element.
HRESULT Collapse( );
This method has no parameters.
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
This is a blocking method that returns after the element has been collapsed.
There are cases when a element that is marked as a leaf node might not know whether it has children until either the IUIAutomationExpandCollapsePattern::Collapse or the IUIAutomationExpandCollapsePattern::Expand method is called. This behavior is possible with a tree view control that does delayed loading of its child items. For example, Microsoft Windows Explorer might display the expand icon for a node even though there are currently no child items; when the icon is clicked, the control polls for child items, finds none, and removes the expand icon. In these cases clients should listen for a property-changed event on the IUIAutomationExpandCollapsePattern::CurrentExpandCollapseState property.
|Minimum supported client||Windows 7, Windows Vista with SP2 and Platform Update for Windows Vista, Windows XP with SP3 and Platform Update for Windows Vista [desktop apps only]|
|Minimum supported server||Windows Server 2008 R2, Windows Server 2008 with SP2 and Platform Update for Windows Server 2008, Windows Server 2003 with SP2 and Platform Update for Windows Server 2008 [desktop apps only]|
|Header||uiautomationclient.h (include UIAutomation.h)|