/// <summary>
/// Handles the <see cref="WUX.Hosting.DesktopWindowXamlSource.TakeFocusRequested" /> event.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="WUX.Hosting.DesktopWindowXamlSourceTakeFocusRequestedEventArgs"/> instance containing the event data.</param>
private void OnTakeFocusRequested(object sender, WUX.Hosting.DesktopWindowXamlSourceTakeFocusRequestedEventArgs e)
{
if (_lastFocusRequest == e.Request.CorrelationId)
{
// If we've arrived at this point, then focus is being move back to us
// therefore, we should complete the operation to avoid an infinite recursion
// by "Restoring" the focus back to us under a new correctationId
var newRequest = new WUX.Hosting.XamlSourceFocusNavigationRequest(
WUX.Hosting.XamlSourceFocusNavigationReason.Restore);
_xamlSource.NavigateFocus(newRequest);
}
else
{
_onTakeFocusRequested = true;
try
{
// Last focus request is not initiated by us, so continue
_lastFocusRequest = e.Request.CorrelationId;
var direction = MapReasonToDirection[e.Request.Reason];
var request = new System.Windows.Input.TraversalRequest(direction);
MoveFocus(request);
}
finally
{
_onTakeFocusRequested = false;
}
}
}
/// <summary>
/// Process Tab from host framework
/// </summary>
/// <param name="request"><see cref="System.Windows.Input.TraversalRequest"/> that contains requested navigation direction</param>
/// <returns>Did handle tab</returns>
protected override bool TabIntoCore(System.Windows.Input.TraversalRequest request)
{
if (_xamlSource.HasFocus && !_onTakeFocusRequested)
{
return(false); // If we have focus already, then we dont need to NavigateFocus
}
// Bug 17544829: Focus is wrong if the previous element is in a different FocusScope than the WindowsXamlHost element.
var focusedElement = System.Windows.Input.FocusManager.GetFocusedElement(
System.Windows.Input.FocusManager.GetFocusScope(this)) as FrameworkElement;
var origin = BoundsRelativeTo(focusedElement, this);
var reason = MapDirectionToReason[request.FocusNavigationDirection];
if (_lastFocusRequest == Guid.Empty)
{
_lastFocusRequest = Guid.NewGuid();
}
var sourceFocusNavigationRequest = new WUX.Hosting.XamlSourceFocusNavigationRequest(reason, origin, _lastFocusRequest);
try
{
var result = _xamlSource.NavigateFocus(sourceFocusNavigationRequest);
// Returning true indicates that focus moved. This will cause the HwndHost to
// move focus to the source’s hwnd (call SetFocus Win32 API)
return(result.WasFocusMoved);
}
finally
{
_lastFocusRequest = Guid.Empty;
}
}
private static void HandlePreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
if (e.Key == System.Windows.Input.Key.Enter)
{
System.Windows.Input.FocusNavigationDirection focusDirection = System.Windows.Input.FocusNavigationDirection.Next;
System.Windows.Input.TraversalRequest request = new System.Windows.Input.TraversalRequest(focusDirection);
UIElement elementWithFocus = sender as UIElement;
if (elementWithFocus != null)
elementWithFocus.MoveFocus(request);
e.Handled = true;
}
}
private static void HandlePreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
if (e.Key == System.Windows.Input.Key.Enter)
{
System.Windows.Input.FocusNavigationDirection focusDirection = System.Windows.Input.FocusNavigationDirection.Next;
System.Windows.Input.TraversalRequest request = new System.Windows.Input.TraversalRequest(focusDirection);
UIElement elementWithFocus = sender as UIElement;
if (elementWithFocus != null)
{
elementWithFocus.MoveFocus(request);
}
e.Handled = true;
}
}
public sealed override bool MoveFocus(System.Windows.Input.TraversalRequest request)
{
return(default(bool));
}
protected virtual new bool TabIntoCore(System.Windows.Input.TraversalRequest request)
{
return(default(bool));
}
bool System.Windows.Interop.IKeyboardInputSink.TabInto(System.Windows.Input.TraversalRequest request)
{
return(default(bool));
}
public virtual new bool MoveFocus(System.Windows.Input.TraversalRequest request)
{
return(default(bool));
}
public virtual bool TabInto(System.Windows.Input.TraversalRequest request)
{
throw null;
}
public bool MoveFocus(System.Windows.Input.TraversalRequest request)
{
return(inter.MoveFocus(request));
}
