/// <summary>
/// Get IUIAutomationTreeWalker based on inidcated mode.
/// </summary>
/// <param name="mode">TreeViewMode to get walker</param>
/// <returns></returns>
public static IUIAutomationTreeWalker GetTreeWalker(TreeViewMode mode)
{
IUIAutomationTreeWalker walker = null;
CUIAutomation h = A11yAutomation.GetUIAutomationObject();
switch (mode)
{
case TreeViewMode.Content:
walker = h.ContentViewWalker;
break;
case TreeViewMode.Control:
walker = h.ControlViewWalker;
break;
case TreeViewMode.Raw:
walker = h.RawViewWalker;
break;
}
return(walker);
}
/// <summary>
/// Refresh the property and patterns with Live data.
/// it also set the Glimpse
/// the update is done via caching to improve performance.
/// </summary>
/// <param name="useProperties">default is false to refresh it from UIElement directly</param>
private static void PopulatePropertiesAndPatternsFromCache(this A11yElement element)
{
try
{
// Get the list of properties to retrieve
A11yAutomation.GetUIAutomationObject().PollForPotentialSupportedProperties((IUIAutomationElement)element.PlatformObject, out int[] ppids, out string[] ppns);
var ppl = new List <Tuple <int, string> >();
for (int i = 0; i < ppids.Length; i++)
{
var id = (int)ppids.GetValue(i);
var name = (string)ppns.GetValue(i);
if (DesktopElement.IsExcludedProperty(id, name) == false)
{
ppl.Add(new Tuple <int, string>(id, name));
}
}
A11yAutomation.GetUIAutomationObject().PollForPotentialSupportedPatterns((IUIAutomationElement)element.PlatformObject, out int[] ptids, out string[] ptns);
var ptl = new List <Tuple <int, string> >();
for (int i = 0; i < ptids.Length; i++)
{
ptl.Add(new Tuple <int, string>((int)ptids.GetValue(i), (string)ptns.GetValue(i)));
}
var pplist = (from pp in ppl
select pp.Item1).ToList();
var ptlist = (from pt in ptl
select pt.Item1).ToList();
// build a cache based on the lists
var cache = DesktopElementHelper.BuildCacheRequest(pplist, ptlist);
// buildupdate cached element
var uia = ((IUIAutomationElement)element.PlatformObject).BuildUpdatedCache(cache);
// retrieve properties from cache
var ps = (from pp in ppl//.AsParallel()
let val = GetPropertyValueFromCache(uia, pp.Item1)
where val != null
select new A11yProperty(pp.Item1, val, pp.Item2));
element.Properties = ps.Where(p => !string.IsNullOrEmpty(p.TextValue)).ToDictionary(d => d.Id);
element.UpdateGlimpse();
// retrieve patterns from cache
var ptlst = from pt in ptl
let pi = A11yPatternFactory.GetPatternInstance(element, uia, pt.Item1, pt.Item2)
where pi != null
select pi;
element.Patterns = ptlst.ToList();
// release previous UIAElement
Marshal.ReleaseComObject(uia);
// release cache interface.
Marshal.ReleaseComObject(cache);
ppl?.Clear();
ptl?.Clear();
}
catch
{
}
}
/// <summary>
/// Build a cacherequest for properties and patterns
/// </summary>
/// <param name="pps">Property ids</param>
/// <param name="pts">Pattern ids</param>
public static IUIAutomationCacheRequest BuildCacheRequest(List <int> pps, List <int> pts)
{
return(GetPropertiesCache(A11yAutomation.GetUIAutomationObject(), pps, pts));
}
