private void ActivateGazeTargetItem(GazeTargetItem target)
{
if (_activeHitTargetTimes.IndexOf(target) == -1)
{
_activeHitTargetTimes.Add(target);
// calculate the time that the first DwellRepeat needs to be fired after. this will be updated every time a DwellRepeat is
// fired to keep track of when the next one is to be fired after that.
var nextStateTime = GetElementStateDelay(target.TargetElement, PointerState.Enter);
target.Reset(nextStateTime);
}
}
private GazeTargetItem TryCreateElementToTargetItem(UIElement element)
{
GazeTargetItem item = default;
using (var enumerator = _elementToTargetItemFactories.GetEnumerator())
{
while (item == null && enumerator.MoveNext())
{
var factory = enumerator.Current;
item = factory(element);
}
}
return(item);
}
/*
* private const string[] pointerStates =
* {
* "Exit",
* "PreEnter",
* "Enter",
* "Fixation",
* "Dwel",
* "DwellRepeat"
* };
*/
private void RaiseGazePointerEvent(GazeTargetItem target, PointerState state, TimeSpan elapsedTime)
{
var control = target?.TargetElement;
// assert(target != _rootElement);
var gpea = new StateChangedEventArgs(control, state, elapsedTime);
/*
* if (control is Button buttonObj && buttonObj.Content != null)
* {
* var buttonText = buttonObj.Content as string;
* Debug.WriteLine("GPE: {0} . {1}, {2}", buttonText, PointerStates[(int)state], elapsedTime);
* }
* else
* {
* Debug.WriteLine("GPE: 0x%08x . %s, %d", target != null ? target.GetHashCode() : 0, PointerStates[(int)state], elapsedTime);
* }
*/
var gazeElement = target != null?GazeInput.GetGazeElement(control) : null;
if (gazeElement != null)
{
gazeElement.RaiseStateChanged(control, gpea);
}
if (state == PointerState.Dwell)
{
var handled = false;
if (gazeElement != null)
{
var args = new DwellInvokedRoutedEventArgs();
gazeElement.RaiseInvoked(control, args);
handled = args.Handled;
}
if (!handled)
{
target.Invoke();
}
}
}
private GazeTargetItem GetHitTarget(Point gazePoint)
{
GazeTargetItem invokable = null;
if (!IsAlwaysActivated)
{
invokable = NonInvokeGazeTargetItem;
}
switch (Window.Current.CoreWindow.ActivationMode)
{
case CoreWindowActivationMode.ActivatedInForeground:
case CoreWindowActivationMode.ActivatedNotForeground:
var elements = VisualTreeHelper.FindElementsInHostCoordinates(gazePoint, null, false);
var element = elements.FirstOrDefault();
invokable = null;
if (element != null)
{
invokable = GazeTargetItem.GetOrCreate(element);
while (element != null && !invokable.IsInvokable)
{
element = VisualTreeHelper.GetParent(element) as UIElement;
if (element != null)
{
invokable = GazeTargetItem.GetOrCreate(element);
}
}
}
if (element == null || !invokable.IsInvokable)
{
invokable = NonInvokeGazeTargetItem;
}
else
{
Interaction interaction;
do
{
interaction = GazeInput.GetInteraction(element);
if (interaction == Interaction.Inherited)
{
element = GetInheritenceParent(element);
}
}while (interaction == Interaction.Inherited && element != null);
if (interaction == Interaction.Inherited)
{
interaction = GazeInput.Interaction;
}
if (interaction != Interaction.Enabled)
{
invokable = NonInvokeGazeTargetItem;
}
}
break;
}
return(invokable);
}
/// <summary>
/// Invoke the default action of the specified UIElement.
/// </summary>
public static void Invoke(UIElement element)
{
var item = GazeTargetItem.GetOrCreate(element);
item.Invoke();
}
public void SetTarget(GazeTargetItem target)
{
Debug.Assert(_target == null);
_target = target;
}
