// We need to treat MSAA's FOCUS winevents differently depending on the OBJID -
// OBJID_CLIENT gets routed to the proxies; _MENU and _SYSMENU get speical treatment.
private AutomationElement GetFocusedElementFromWinEvent(IntPtr hwnd, int idObject, int idChild)
{
try
{
IRawElementProviderSimple provider = null;
// These are the only object types that oleacc proxies allow to take focus.
// (Native IAccessibles can send focus for other custom OBJID valus, but those are no use
// to us.)
// Try and get providers for them ourself - if we don't get anything, then
// defer to core to get the element for the HWND itself.
if (idObject == UnsafeNativeMethods.OBJID_CLIENT)
{
// regular focus - pass it off to a proxy...
provider = ProxyManager.ProxyProviderFromHwnd(NativeMethods.HWND.Cast(hwnd), idChild, UnsafeNativeMethods.OBJID_CLIENT);
}
else if (idObject == UnsafeNativeMethods.OBJID_MENU)
{
// menubar focus - see if there's a menubar pseudo-proxy registered...
ClientSideProviderFactoryCallback factory = ProxyManager.NonClientMenuBarProxyFactory;
if (factory != null)
{
provider = factory(hwnd, idChild, idObject);
}
}
else if (idObject == UnsafeNativeMethods.OBJID_SYSMENU)
{
// system menu box focus - see if there's a sysmenu pseudo-proxy registered...
ClientSideProviderFactoryCallback factory = ProxyManager.NonClientSysMenuProxyFactory;
if (factory != null)
{
provider = factory(hwnd, idChild, idObject);
}
}
else if (idObject <= 0)
{
return(null);
}
else
{
// This covers OBJID_CLIENT and custom OBJID cases.
// Pass it to the proxy manager: most proxies will just handle OBJID_CLIENT,
// but the MSAA proxy can potentally handle other OBJID values.
provider = ProxyManager.ProxyProviderFromHwnd(NativeMethods.HWND.Cast(hwnd), idChild, idObject);
}
if (provider != null)
{
// Ask the fragment root if any of its children really have the focus
IRawElementProviderFragmentRoot fragment = provider as IRawElementProviderFragmentRoot;
if (fragment != null)
{
// if we get back something that is different than what we started with and its not null
// use that instead. This is here to get the subset link in the listview but could be usefull
// for listview subitems as well.
IRawElementProviderSimple realFocus = fragment.GetFocus();
if (realFocus != null && !Object.ReferenceEquals(realFocus, provider))
{
provider = realFocus;
}
}
SafeNodeHandle hnode = UiaCoreApi.UiaNodeFromProvider(provider);
return(AutomationElement.Wrap(hnode));
}
else
{
// Didn't find a proxy to handle this hwnd - pass off to core...
return(AutomationElement.FromHandle(hwnd));
}
}
catch (Exception e)
{
if (Misc.IsCriticalException(e))
{
throw;
}
return(null);
}
}
//
protected override bool ReleaseHandle()
{
return(Misc.CloseHandle(handle));
}
// Given an entry from one of the hash-tables or lists, check if it matches the image/classname, and if so, call the
// factory method to create the proxy.
// (Because full classname matching is done via hash-table lookup, this only needs to do string comparisons
// for partial classname matches.)
static private IRawElementProviderSimple GetProxyFromEntry(ProxyScoping findType, object entry, ref string imageName, NativeMethods.HWND hwnd, int idChild, int idObject, string classNameForPartialMatch)
{
// First, determine if the entry matches, and if so, extract the factory callback...
ClientSideProviderFactoryCallback factoryCallback = null;
// The entry may be a ClientSideProviderFactoryCallback or ClientSideProviderDescription...
if (findType == ProxyScoping.ImageOnlyHandlers || findType == ProxyScoping.FallbackHandlers)
{
// Handle the fallback and image cases specially. The array for these is an array
// of ClientSideProviderFactoryCallbacks, not ClientSideProviderDescription.
factoryCallback = (ClientSideProviderFactoryCallback)entry;
}
else
{
// Other cases use ClientSideProviderDescription...
ClientSideProviderDescription pi = (ClientSideProviderDescription)entry;
// Get the image name if necessary...
#pragma warning suppress 6507 // Null and Empty string mean different things here.
if (imageName == null && pi.ImageName != null)
{
imageName = GetImageName(hwnd);
}
if (pi.ImageName == null || pi.ImageName == imageName)
{
// Check if we have a match for this entry...
switch (findType)
{
case ProxyScoping.ExactMatchApparentClassName:
factoryCallback = pi.ClientSideProviderFactoryCallback;
break;
case ProxyScoping.ExactMatchRealClassName:
if ((pi.Flags & ClientSideProviderMatchIndicator.DisallowBaseClassNameMatch) == 0)
{
factoryCallback = pi.ClientSideProviderFactoryCallback;
}
break;
case ProxyScoping.PartialMatchApparentClassName:
if (classNameForPartialMatch.IndexOf(pi.ClassName, StringComparison.Ordinal) >= 0)
{
factoryCallback = pi.ClientSideProviderFactoryCallback;
}
break;
case ProxyScoping.PartialMatchRealClassName:
if (classNameForPartialMatch.IndexOf(pi.ClassName, StringComparison.Ordinal) >= 0 &&
((pi.Flags & ClientSideProviderMatchIndicator.DisallowBaseClassNameMatch) == 0))
{
factoryCallback = pi.ClientSideProviderFactoryCallback;
}
break;
default:
Debug.Assert(false, "unexpected switch() case:");
break;
}
}
}
// Second part: did we get a match? If so, use the factory callback to obtain an instance...
if (factoryCallback == null)
{
return(null);
}
// if we get an exception creating a proxy just don't create the proxy and let the UIAutomation default proxy be used
// This will still allow the tree to be navigated and some properties to be made availible.
//
try
{
return(factoryCallback(hwnd, idChild, idObject));
}
catch (Exception e)
{
if (Misc.IsCriticalException(e))
{
throw;
}
return(null);
}
}