void Win7UIAClientForm_FormClosed(object sender, FormClosedEventArgs e)
{
if (_synth != null)
{
_synth.SpeakAsyncCancelAll();
_synth = null;
}
if (_highlight != null)
{
_highlight.Uninitialize();
_highlight = null;
}
if (_sampleFocusEventHandler != null)
{
_sampleFocusEventHandler.Uninitialize();
_sampleFocusEventHandler = null;
}
// Give any background threads created on startup a chance to close down gracefully.
Thread.Sleep(200);
}
/////////////////////////////////////////////////////////////////////////////////////////////////
//
// Win7UIAClientForm_FormClosed()
//
// Uninitialize and release everything created on startup.
//
/////////////////////////////////////////////////////////////////////////////////////////////////
void Win7UIAClientForm_FormClosed(object sender, FormClosedEventArgs e)
{
if (_linkProcessor != null)
{
_linkProcessor.Uninitialize();
_linkProcessor = null;
}
if (_highlight != null)
{
_highlight.Uninitialize();
_highlight = null;
}
if (_sampleEventHandler != null)
{
_sampleEventHandler.Uninitialize();
_sampleEventHandler = null;
}
// Give any background threads created on startup a chance to close down gracefully.
Thread.Sleep(200);
}
void InitializeSample()
{
// Initialize the highlighting used to magnify the element with focus.
_highlight = new Highlight();
_highlight.Initialize();
try
{
_synth = new SpeechSynthesizer();
}
catch
{
// Allow this sample to run even if speech is not available.
_synth = null;
}
// Initialize the event handler which is called when focus changes.
SampleUIEventHandlerDelegate sampleUIEventHandlerDelegate = new SampleUIEventHandlerDelegate(HandleEventOnUIThread);
_sampleFocusEventHandler = new SampleFocusEventHandler(this, sampleUIEventHandlerDelegate);
// Now tell the sample event handler to register for events from UIA.
_sampleFocusEventHandler.StartEventHandler();
}
/////////////////////////////////////////////////////////////////////////////////////////////////
//
// Initialize()
//
// In order to prevent any possibility of the calls to UIA below leading to delays while a
// a UIA event handler is also running, all calls to UIA below will run on a background MTA
// thread. This means that the app's main UI thread makes no calls to UIA at all.
//
// Ths method runs on the main UI thread.
//
/////////////////////////////////////////////////////////////////////////////////////////////////
public void Initialize(Win7UIAClientForm_LinkProcessor.SampleUIListUpdateDelegate UIUpdateDelegate, ListView listViewLinks, Highlight highlight)
{
_UIUpdateDelegate = UIUpdateDelegate;
_listViewLinks = listViewLinks;
_highlight = highlight;
// The object will call UIA on a background MTA thread. This sample doesn't
// expect to enter here with a background thread already initialized.
if (_threadBackground != null)
{
return;
}
// The background thread will wait for notifications when action is required.
_autoEventMsg = new AutoResetEvent(false);
// Create the background thread, and wait until it's ready to start working.
_autoEventInit = new AutoResetEvent(false);
ParameterizedThreadStart paramThreadStart = new ParameterizedThreadStart(s_DoWork);
_threadBackground = new Thread(paramThreadStart);
_threadBackground.SetApartmentState(ApartmentState.MTA);
_threadBackground.Start(this);
_autoEventInit.WaitOne();
}