/// <summary>
/// Responds to DesktopWindowsXamlSource TakeFocusRequested event
/// </summary>
/// <param name="sender">DesktopWindowsXamlSource</param>
/// <param name="args">DesktopWindowXamlSourceTakeFocusRequestedEventArgs</param>
private void OnTakeFocusRequested(Windows.UI.Xaml.Hosting.DesktopWindowXamlSource sender, Windows.UI.Xaml.Hosting.DesktopWindowXamlSourceTakeFocusRequestedEventArgs args)
{
if (_lastFocusRequest == args.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 correlationId
var newRequest = new Windows.UI.Xaml.Hosting.XamlSourceFocusNavigationRequest(
Windows.UI.Xaml.Hosting.XamlSourceFocusNavigationReason.Restore);
_xamlSource.NavigateFocus(newRequest);
_lastFocusRequest = newRequest.CorrelationId;
}
else
{
// Focus was not initiated by WindowsXamlHost. Continue processing the Focus request.
var reason = args.Request.Reason;
if (reason == Windows.UI.Xaml.Hosting.XamlSourceFocusNavigationReason.First || reason == Windows.UI.Xaml.Hosting.XamlSourceFocusNavigationReason.Last)
{
var forward = reason == Windows.UI.Xaml.Hosting.XamlSourceFocusNavigationReason.First;
_forceFocusNavigation = true;
try
{
Parent.SelectNextControl(this, forward, tabStopOnly: true, nested: false, wrap: true);
}
finally
{
_forceFocusNavigation = 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;
}
}
/// <summary>
/// Processes a tab key, ensuring that Xaml has an opportunity
/// to handle the command before normal Windows Forms processing.
/// (Xaml must be notified of keys that invoke focus navigation.)
/// </summary>
/// <returns>true if the command was processed</returns>
protected override bool ProcessTabKey(bool forward)
{
// Determine if the currently focused element is the last element for the requested
// navigation direction. If the currently focused element is not the last element
// for the requested navigation direction, navigate focus to the next focusable
// element.
if (!_xamlSource.HasFocus || _forceFocusNavigation)
{
_forceFocusNavigation = false;
var reason = forward ? Windows.UI.Xaml.Hosting.XamlSourceFocusNavigationReason.First : Windows.UI.Xaml.Hosting.XamlSourceFocusNavigationReason.Last;
var request = new Windows.UI.Xaml.Hosting.XamlSourceFocusNavigationRequest(reason, default(Windows.Foundation.Rect));
_lastFocusRequest = request.CorrelationId;
var result = _xamlSource.NavigateFocus(request);
if (result.WasFocusMoved)
{
return(true);
}
return(false);
}
else
{
// Temporary Focus handling for Redstone 5
// Call Windows.UI.Xaml.Input.FocusManager.TryMoveFocus Next or Previous and return
Windows.UI.Xaml.Input.FocusNavigationDirection navigationDirection =
forward ? Windows.UI.Xaml.Input.FocusNavigationDirection.Next : Windows.UI.Xaml.Input.FocusNavigationDirection.Previous;
return(Windows.UI.Xaml.Input.FocusManager.TryMoveFocus(navigationDirection));
}
}
/// <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;
}
}
}
