private static object?FindNextFocus(
FocusNavigationDirection focusNavigationDirection,
XYFocusOptions xyFocusOptions)
{
if (focusNavigationDirection == FocusNavigationDirection.None)
{
throw new ArgumentOutOfRangeException(nameof(focusNavigationDirection));
}
var core = DXamlCore.Current;
if (core == null)
{
throw new InvalidOperationException("XamlCore is not set.");
}
FocusManager?focusManager = null;
if (xyFocusOptions.SearchRoot is DependencyObject searchRoot)
{
focusManager = VisualTree.GetFocusManagerForElement(searchRoot);
}
else if (core.GetHandle().InitializationType == InitializationType.IslandsOnly)
{
// Return error if searchRoot is not valid in islands/ desktop mode
throw new ArgumentException("The search root must not be null.");
}
else
{
// For compat reasons, these FocusManager static APIs need to always use the CoreWindow as the
// ContentRoot, so explicitly return the CoreWindow content root.
var contentRootCoordinator = core.GetHandle().ContentRootCoordinator;
var contentRoot = contentRootCoordinator?.CoreWindowContentRoot;
if (contentRoot == null)
{
return(null);
}
focusManager = contentRoot.FocusManager;
}
if (focusManager == null)
{
return(null);
}
var root = focusManager.ContentRoot;
var scale = RootScale.GetRasterizationScaleForContentRoot(root);
ConvertOptionsRectsToPhysical(scale, xyFocusOptions);
var candidate = focusManager.FindNextFocus(
new FindFocusOptions(focusNavigationDirection),
xyFocusOptions);
return(candidate);
}
private static bool TryMoveFocusStatic(
FocusNavigationDirection focusNavigationDirection,
FindNextElementOptions?pFocusNavigationOverride,
ref IAsyncOperation <FocusMovementResult>?asyncOperation,
bool useAsync)
{
DependencyObject?searchRootAsDO = null;
Rect hintRect;
Rect exclusionRect;
XYFocusNavigationStrategyOverride navigationStrategyOverride;
XYFocusOptions xyFocusOptions = new XYFocusOptions();
var pIsFocusMoved = false;
FindNextElementOptions?options = pFocusNavigationOverride;
bool ignoreOcclusivity;
FocusAsyncOperation?spFocusAsyncOperation = null;
DXamlCore pCore = DXamlCore.Current;
if (pCore == null)
{
throw new InvalidOperationException("XamlCore is not set.");
}
FocusManager?focusManager = null;
ContentRoot? contentRoot = null;
var contentRootCoordinator = pCore.GetHandle().ContentRootCoordinator;
if (options != null)
{
var searchRoot = options.SearchRoot;
exclusionRect = options.ExclusionRect;
hintRect = options.HintRect;
navigationStrategyOverride = options.XYFocusNavigationStrategyOverride;
ignoreOcclusivity = options.IgnoreOcclusivity;
searchRootAsDO = searchRoot as DependencyObject;
if (searchRootAsDO != null)
{
contentRoot = VisualTree.GetContentRootForElement(searchRootAsDO);
focusManager = contentRoot?.FocusManager;
if (focusManager == null)
{
throw new InvalidOperationException("Search root is not part of the visual tree.");
}
}
else if (pCore.GetHandle().InitializationType == InitializationType.IslandsOnly)
{
// SearchRoot must exist for islands/ desktop
throw new ArgumentException("The search root must not be null.");
}
else
{
contentRoot = contentRootCoordinator?.CoreWindowContentRoot;
}
// If we are being passed in the public root visual of a XamlRoot as the SearchRoot, then override the SearchRoot to be the RootVisual.
// This will enable searching through both the public root visual and the popup root. We will also allow Next/Prev.
bool shouldOverrideSearchRoot =
contentRoot != null &&
GetAppVisibleXamlRootContent(contentRoot) == searchRootAsDO;
if (shouldOverrideSearchRoot)
{
searchRootAsDO = contentRoot !.VisualTree.RootElement;
}
else
{
if (focusNavigationDirection != FocusNavigationDirection.Up &&
focusNavigationDirection != FocusNavigationDirection.Down &&
focusNavigationDirection != FocusNavigationDirection.Left &&
focusNavigationDirection != FocusNavigationDirection.Right)
{
throw new ArgumentOutOfRangeException(
"Focus navigation directions Next, Previous, and None " +
"are not supported when using FindNextElementOptions");
}
}
xyFocusOptions.NavigationStrategyOverride = navigationStrategyOverride;
xyFocusOptions.IgnoreOcclusivity = ignoreOcclusivity;
Rect exclusionRectNative = exclusionRect;
Rect hintRectNative = hintRect;
if (searchRootAsDO != null)
{
xyFocusOptions.SearchRoot = searchRootAsDO;
}
if (!exclusionRectNative.IsUniform)
{
xyFocusOptions.ExclusionRect = exclusionRectNative;
}
if (!hintRectNative.IsUniform)
{
xyFocusOptions.FocusHintRectangle = hintRectNative;
}
if (contentRoot != null)
{
var scale = RootScale.GetRasterizationScaleForContentRoot(contentRoot);
ConvertOptionsRectsToPhysical(scale, xyFocusOptions);
}
}
if (focusManager == null)
{
// Return error if call is without focus navigation option in islands/ desktop
if (pCore.GetHandle().InitializationType == InitializationType.IslandsOnly)
{
throw new InvalidOperationException("Focus navigation options must be set for desktop apps.");
}
// For compat reasons, these FocusManager static APIs need to always use the CoreWindow as the
// ContentRoot, so explicitly return the CoreWindow content root.
if (contentRoot == null)
{
contentRoot = contentRootCoordinator?.CoreWindowContentRoot;
}
if (contentRoot == null)
{
return(pIsFocusMoved);
}
focusManager = contentRoot.FocusManager;
}
FocusMovement movement = new FocusMovement(xyFocusOptions, focusNavigationDirection, null);
if (useAsync)
{
spFocusAsyncOperation = new FocusAsyncOperation(movement.CorrelationId);
asyncOperation = spFocusAsyncOperation.CreateAsyncOperation();
// Async operation is not guaranteed to be released synchronously.
// Therefore, we let UpdateFocus to handle the responsibility of releasing it.
// TODO Uno specific: Do not use async operations, only simulated
// movement.ShouldCompleteAsyncOperation = focusManager.TrySetAsyncOperation(spFocusAsyncOperation);
if (movement.ShouldCompleteAsyncOperation)
{
//spFocusAsyncOperation.StartOperation();
}
}
FocusMovementResult result = focusManager.FindAndSetNextFocus(movement);
// TODO Uno specific: Simulate async completion.
spFocusAsyncOperation?.CoreSetResults(result);
spFocusAsyncOperation?.CoreFireCompletion();
// We ignore result.GetHResult() here because this is a "Try" function
pIsFocusMoved = result.WasMoved;
// Async operation is not guaranteed to be released synchronously.
// Therefore, we let UpdateFocus to handle the responsibility of releasing it.
//spFocusAsyncOperation.Detach();
return(pIsFocusMoved);
}