private void DarkenElement(BindableGraphicalUiElement elementPushed)
{
if (elementPushed is ColoredCircleRuntime circleRuntime)
{
circleRuntime.IsDimmed = true;
InvalidateSurface();
}
}
private async void HandleTouch(object sender, SKTouchEventArgs args)
{
// Maybe we need to adjust this for other devices?
float threshold = (float)20;
// SkiaSharp views return
// whether they handle touches
// through args.Handled. If the
// value is false, then control passes
// from this view to underlying views. Once
// it is passed, it does not return to this view
// until a new touch is initiated.
switch (args.ActionType)
{
case SKTouchAction.Pressed:
yPushed = args.Location.Y;
isWithinThreshold = true;
if (customClickEventToRaise != null)
{
var canProceed = await ExclusiveUiInteractionSemaphor.WaitAsync(0);
if (canProceed)
{
try
{
await customClickEventToRaise();
}
finally
{
ExclusiveUiInteractionSemaphor.Release(1);
}
}
}
else
{
var canProceed = await ExclusiveUiInteractionSemaphor.WaitAsync(0);
if (canProceed)
{
elementPushed = FindClickableElement(args.Location.X, args.Location.Y, GumElementsInternal);
if (elementPushed != null)
{
DarkenElement(elementPushed);
}
ExclusiveUiInteractionSemaphor.Release(1);
}
}
args.Handled = true;
break;
case SKTouchAction.Moved:
if (isWithinThreshold)
{
if (System.Math.Abs(args.Location.Y - yPushed) > threshold)
{
isWithinThreshold = false;
var whatToLighten = elementPushed;
if (whatToLighten != null)
{
LightenElement(whatToLighten);
}
}
}
args.Handled = isWithinThreshold;
break;
case SKTouchAction.Released:
{
var whatToLighten = elementPushed;
if (whatToLighten != null)
{
LightenElement(whatToLighten);
}
if (customTouchEvent != null)
{
var canProceed = await ExclusiveUiInteractionSemaphor.WaitAsync(0);
if (canProceed)
{
try
{
await customTouchEvent(args.Location.X, args.Location.Y);
}
finally
{
ExclusiveUiInteractionSemaphor.Release(1);
}
}
}
await TryClickOnContainedGumObjects(args.Location.X, args.Location.Y);
}
break;
}
}
public void Add(BindableGraphicalUiElement toAdd)
{
GumElementsInternal.Add(toAdd);
}
