IRawElementProviderWindowlessSite::GetAdjacentFragment method (uiautomationcore.h)

Retrieves a fragment pointer for a fragment that is adjacent to the windowless Microsoft ActiveX control owned by this control site.

Syntax

HRESULT GetAdjacentFragment(
                NavigateDirection           direction,
  [out, retval] IRawElementProviderFragment **ppParent
);

Parameters

direction

[out, retval] ppParent

Type: IRawElementProviderFragment**

Receives the adjacent fragment.

Return value

Type: HRESULT

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code. The return value is E_INVALIDARG if the direction is NavigateDirection_FirstChild or NavigateDirection_LastChild, which are not valid for this method. If there is no adjacent fragment in the requested direction, the method returns S_OK and sets ppRetVal to NULL.

Remarks

To return the parent of the fragment, an object that implements the IRawElementProviderFragment interface must be able to implement the Navigate method. Implementing Navigate is difficult for a windowless ActiveX control because the control might be unable to determine its location in the accessible tree of the parent object. The GetAdjacentFragment method enables the windowless ActiveX control to query its site for the adjacent fragment, and then return that fragment to the client that called Navigate.

A provider typically calls this method as part of handling the IRawElementProviderFragment::Navigate method.

Examples

The following C++ code example shows how to implement the GetAdjacentFragment method.

IFACEMETHODIMP CProviderWindowlessSite::GetAdjacentFragment(
        enum NavigateDirection direction, IRawElementProviderFragment **ppFragment)   
{
    if (ppFragment == NULL)
    {
        return E_INVALIDARG;
    }
    
    *ppFragment = NULL;
    HRESULT hr = S_OK;

    switch (direction)
    {
        case NavigateDirection_Parent:
            {  
                IRawElementProviderSimple *pSimple = NULL;

                // Call an application-defined function to retrieve the
                // parent provider interface.
                hr = GetParentProvider(&pSimple);  
                if (SUCCEEDED(hr))  
                {  
                    // Get the parent's IRawElementProviderFragment interface.
                    hr = pSimple->QueryInterface(IID_PPV_ARGS(ppFragment));  
                    pSimple->Release();  
                } 
            }  
            break;  
  
        case NavigateDirection_FirstChild:
        case NavigateDirection_LastChild:
            hr = E_INVALIDARG;
            break;

        // Ignore NavigateDirection_NextSibling and NavigateDirection_PreviousSibling
        // because there are no adjacent fragments.
        default:  
            break;  
    }  
  
    return hr;  
}   

Requirements

See also

IRawElementProviderWindowlessSite