private static void OnSourceRootElementChanged (IAutomationSource source)
{
if (inSourceRootElementChanged) {
pendingRootChangeSources.Enqueue (source);
return;
}
lock (RawViewWalker.directChildrenLock) {
inSourceRootElementChanged = true;
List<AutomationElement> rootElements = new List<AutomationElement> ();
var pidElementMapping = new Dictionary<int, IElement> ();
foreach (AutomationElement element in RawViewWalker.directChildren) {
if (element.SourceElement.AutomationSource != source) {
try {
pidElementMapping [element.Current.ProcessId] = element.SourceElement;
} catch { continue; } // TODO: ElementNotAvailableException
rootElements.Add (element);
}
}
// We don't handle the cleanup of AutomationElements here, they're
// handled by each AutomationSource.
// "Clean up" includes removing event handlers etc.
AddUniqueRootElements (rootElements, source, pidElementMapping);
RawViewWalker.directChildren = rootElements;
inSourceRootElementChanged = false;
}
Log.Debug ("Root elements are refreshed, Count: {0}", RawViewWalker.directChildren.Count);
while (pendingRootChangeSources.Count > 0)
OnSourceRootElementChanged (pendingRootChangeSources.Dequeue ());
}
private static void OnSourceRootElementChanged(IAutomationSource source)
{
if (inSourceRootElementChanged)
{
pendingRootChangeSources.Enqueue(source);
return;
}
lock (RawViewWalker.directChildrenLock) {
inSourceRootElementChanged = true;
List <AutomationElement> rootElements = new List <AutomationElement> ();
var pidElementMapping = new Dictionary <int, IElement> ();
foreach (AutomationElement element in RawViewWalker.directChildren)
{
if (element.SourceElement.AutomationSource != source)
{
try {
pidElementMapping [element.Current.ProcessId] = element.SourceElement;
} catch { continue; } // TODO: ElementNotAvailableException
rootElements.Add(element);
}
}
// We don't handle the cleanup of AutomationElements here, they're
// handled by each AutomationSource.
// "Clean up" includes removing event handlers etc.
AddUniqueRootElements(rootElements, source, pidElementMapping);
RawViewWalker.directChildren = rootElements;
inSourceRootElementChanged = false;
}
Log.Debug("Root elements are refreshed, Count: {0}", RawViewWalker.directChildren.Count);
while (pendingRootChangeSources.Count > 0)
{
OnSourceRootElementChanged(pendingRootChangeSources.Dequeue());
}
}
// TODO: This approach will completely break when the
// MoonUiaDbusBridge work is committed. This code
// will be replaced with proper source tree merging,
// which requires updates to gtk-sharp.
private static void AddUniqueRootElements(List <AutomationElement> rootElements,
IAutomationSource source,
Dictionary <int, IElement> pidElementMapping)
{
const string at_spi = "at-spi";
foreach (IElement sourceElement in source.GetRootElements())
{
int pid;
string sourceFid;
try {
pid = sourceElement.ProcessId;
sourceFid = sourceElement.FrameworkId;
} catch { continue; } // TODO: ElementNotAvailableException
// NOTE: This is not a complete mapping, since
// one process could generate multiple root
// elements. But it's sufficient to catch
// that at least one element exists for
// a given PID.
if (pidElementMapping.TryGetValue(pid, out IElement found))
{
string foundFid;
try {
foundFid = found.FrameworkId;
} catch { continue; } // TODO: ElementNotAvailableException
// Ignore at-spi elements when elements
// for this process from a preferred
// framework exist
if (sourceFid == at_spi &&
foundFid != at_spi)
{
continue;
}
// Remove at-spi elements when elements
// for this process from a preferred
// framework exist
else if (sourceFid != at_spi &&
foundFid == at_spi)
{
// TODO: When we fix ElementNotAvailableException,
// we'll need to mark these
// elements as unavailable.
rootElements.RemoveAll(e => e.Current.ProcessId == pid &&
e.Current.FrameworkId == at_spi);
}
}
rootElements.Add(SourceManager.GetOrCreateAutomationElement(sourceElement));
pidElementMapping [pid] = sourceElement;
}
}
private static IAutomationSource GetAutomationSource(string sourceAssemblyName)
{
Assembly sourceAssembly = null;
try {
sourceAssembly = Assembly.Load(sourceAssemblyName);
} catch (Exception e) {
Log.Warn(string.Format("Error loading UIA source ({0}): {1}",
sourceAssemblyName,
e));
return(null);
}
Type sourceType = null;
// Quickie inefficent implementation
Type sourceInterfaceType = typeof(IAutomationSource);
foreach (Type type in sourceAssembly.GetTypes())
{
if (sourceInterfaceType.IsAssignableFrom(type))
{
sourceType = type;
break;
}
}
if (sourceType == null)
{
Log.Error("No UIA source found in assembly: " +
sourceAssemblyName);
return(null);
}
try {
IAutomationSource source
= (IAutomationSource)Activator.CreateInstance(sourceType);
if (!source.IsAccessibilityEnabled)
{
return(null);
}
source.Initialize();
return(source);
} catch (Exception e) {
Log.Error("Failed to load UIA source: " + e);
return(null);
}
}
internal static IAutomationSource [] GetAutomationSources()
{
if (sources == null)
{
lock (sourcesLock) {
if (sources == null)
{
var sourcesList = new List <IAutomationSource> ();
// Let MONO_UIA_SOURCE env var override default source
string sourceAssemblyNames =
Environment.GetEnvironmentVariable("MONO_UIA_SOURCE");
if (string.IsNullOrEmpty(sourceAssemblyNames))
{
sourceAssemblyNames =
UiaDbusSourceAssembly + ";" + AtspiUiaSourceAssembly;
}
foreach (string sourceAssembly in sourceAssemblyNames.Split(';'))
{
if (string.IsNullOrEmpty(sourceAssembly))
{
continue;
}
IAutomationSource source = GetAutomationSource(sourceAssembly);
if (source != null)
{
sourcesList.Add(source);
}
}
sourcesList.Add(ClientAutomationSource.Instance);
sources = sourcesList.ToArray();
}
}
}
return(sources);
}
// TODO: This approach will completely break when the
// MoonUiaDbusBridge work is committed. This code
// will be replaced with proper source tree merging,
// which requires updates to gtk-sharp.
private static void AddUniqueRootElements (List<AutomationElement> rootElements,
IAutomationSource source,
Dictionary<int, IElement> pidElementMapping)
{
const string at_spi = "at-spi";
foreach (IElement sourceElement in source.GetRootElements ()) {
int pid;
try {
pid = sourceElement.ProcessId;
} catch { continue; } // TODO: ElementNotAvailableException
IElement found;
// NOTE: This is not a complete mapping, since
// one process could generate multiple root
// elements. But it's sufficient to catch
// that at least one element exists for
// a given PID.
if (pidElementMapping.TryGetValue (pid, out found)) {
var sourceFid = sourceElement.FrameworkId;
var foundFid = found.FrameworkId;
// Ignore at-spi elements when elements
// for this process from a preferred
// framework exist
if (sourceFid == at_spi &&
foundFid != at_spi)
continue;
// Remove at-spi elements when elements
// for this process from a preferred
// framework exist
else if (sourceFid != at_spi &&
foundFid == at_spi) {
// TODO: When we fix ElementNotAvailableException,
// we'll need to mark these
// elements as unavailable.
rootElements.RemoveAll (e => e.Current.ProcessId == pid &&
e.Current.FrameworkId == at_spi);
}
}
rootElements.Add (
SourceManager.GetOrCreateAutomationElement (sourceElement));
pidElementMapping [pid] = sourceElement;
}
}
