bool IEnumerator.MoveNext()
{
if (_cancellationToken.IsCancellationRequested)
{
return(false);
}
if (_elementQueue.Count == 0)
{
return(false);
}
_current = _elementQueue.Dequeue();
AutomationElement childAutomationElement = TreeWalker.ControlViewWalker.GetFirstChild(_current, _cancellationToken);
while (childAutomationElement != null)
{
if (_cancellationToken.IsCancellationRequested)
{
return(false);
}
if (_controlType.CanBeNestedUnder(childAutomationElement))
{
_elementQueue.Enqueue(childAutomationElement);
}
childAutomationElement = TreeWalker.ControlViewWalker.GetNextSibling(childAutomationElement);
}
return(true);
}
public ChildIterator(string name, AutomationElement automationElement, CancellationToken cancellationToken)
{
_automationElement = automationElement;
_cancellationToken = cancellationToken;
// tree walker is used instead of FindAll, FindAll cannot be "interrupted"
_treeWalker = TreeWalker.ControlViewWalker;
/* using "plain" ControlViewWalker because the advanced one with conditions is taking too long to complete
* and sometimes it returns elements that are coming from a different subtree - which can be avoided by comparing parent
* of the element with automationElement, but that will reduce speed
* overall the reason is unknown
* new TreeWalker(new AndCondition(
* Automation.ControlViewCondition,
* // treewalker was jumping around to another windows
* new PropertyCondition(AutomationElement.ProcessIdProperty, automationElement.Current.ProcessId),
* // return only the elements that are visible
* //new PropertyCondition(AutomationElement.IsOffscreenProperty, false),
* condition));*
*/
var automationId = automationElement.Current.AutomationId;
var condition = Condition.TrueCondition;
if (name != null)
{
controlType = name.AsControlType();
condition = new PropertyCondition(AutomationElement.ControlTypeProperty, controlType);
if (!controlType.CanBeNestedUnder(automationElement.Current.ControlType))
{
condition = Condition.FalseCondition;
_empty = true;
}
}
}
bool IEnumerator.MoveNext()
{
if (_cancellationToken.IsCancellationRequested)
{
return(false);
}
/*if (_matching.Any())
* {
* Current = _matching.Dequeue();
* return true;
* }*/
if (_elementQueue.Count == 0)
{
return(false);
}
_current = _elementQueue.Dequeue();
AutomationElement childAutomationElement = TreeWalker.ControlViewWalker.GetFirstChild(_current);
/*var children = _current.FindAll(TreeScope.Children, Condition.TrueCondition).Cast<AutomationElement>()
* .OrderBy(c => c.Current.BoundingRectangle.TopLeft, new PointComparer())
* .ToList();*/
//System.Diagnostics.Debug.WriteLine($"FindElements by type {_controlType.ProgrammaticName}, root {_current.ToDiagString()} ... ({children.Count()})");
while (childAutomationElement != null)
{
if (_cancellationToken.IsCancellationRequested)
{
return(false);
}
if (_controlType.CanBeNestedUnder(childAutomationElement))
{
_elementQueue.Enqueue(childAutomationElement);
}
childAutomationElement = TreeWalker.ControlViewWalker.GetNextSibling(childAutomationElement);
}
/*
* foreach (AutomationElement automationElement in children)
* {
* if (_cancellationToken.IsCancellationRequested)
* {
* return false;
* }
*
* if (!_controlType.CanBeNestedUnder(automationElement))
* {
* continue;
* }
*
* _elementQueue.Enqueue(automationElement);
* }*/
return(true);
}
bool IEnumerator.MoveNext()
{
if (_cancellationToken.IsCancellationRequested)
{
return(false);
}
if (_elementQueue.Count == 0)
{
return(false);
}
_current = _elementQueue.Dequeue();
AutomationElement childAutomationElement = TreeWalker.ControlViewWalker.GetFirstChild(_current, _cancellationToken);
while (childAutomationElement != null)
{
if (_cancellationToken.IsCancellationRequested)
{
return(false);
}
if (_controlType.CanBeNestedUnder(childAutomationElement))
{
_elementQueue.Enqueue(childAutomationElement);
}
// sometimes the app can stop responding when performing long operation thanks to poor designed
// try to wait for the response in a loop
while (true)
{
if (_cancellationToken.IsCancellationRequested)
{
return(false);
}
try
{
childAutomationElement = TreeWalker.ControlViewWalker.GetNextSibling(childAutomationElement);
break;
}
catch (System.Runtime.InteropServices.COMException comEx) when(comEx.IsTimeout())
{
// retry after a short sleep
Thread.Sleep(TimeSpan.FromMilliseconds(250));
// childAutomationElement = TreeWalker.ControlViewWalker.GetNextSibling(childAutomationElement);
}
}
}
return(true);
}