// this doesn't seem to work.
async void PreviewAreaTappedToChangeFocus(UIGestureRecognizer tap)
{
try {
Debug.WriteLine("DHB:CameraServices_iOS:PreviewAreaTappedToChangeFocus tap");
captureDevice.FocusPointOfInterest = tap.LocationOfTouch(0, tap.View);
} catch (Exception err) {
Debug.WriteLine("DHB:Exception " + err.ToString());
}
}
public static Xamarin.Forms.Point[] GetTouches(UIGestureRecognizer gestureRecognizer, CGPoint locationAtStart)
{
nint numberOfTouches = gestureRecognizer.NumberOfTouches;
var array = new Xamarin.Forms.Point[numberOfTouches];
for (int i = 0; i < numberOfTouches; i++)
{
//var viewPoint = gestureRecognizer.LocationOfTouch(i, gestureRecognizer.View);
//var windowPoint = gestureRecognizer.View.ConvertPointToView (viewPoint, null);
var windowPoint = gestureRecognizer.LocationOfTouch(i, null);
array[i] = new Xamarin.Forms.Point(windowPoint.X - locationAtStart.X, windowPoint.Y - locationAtStart.Y);
}
return(array);
}
public static Xamarin.Forms.Point[] GetTouches(this UIGestureRecognizer gestureRecognizer, UIView view)
{
nint numberOfTouches = gestureRecognizer.NumberOfTouches;
var array = new Xamarin.Forms.Point[numberOfTouches];
for (int i = 0; i < numberOfTouches; i++)
{
/*
* if (view == null)
* {
* var page = Xamarin.Forms.Application.Current.MainPage;
* if (page is Xamarin.Forms.NavigationPage navPage)
* page = navPage.CurrentPage;
* if (Xamarin.Forms.Platform.iOS.Platform.GetRenderer(page) is Xamarin.Forms.Platform.iOS.IVisualElementRenderer renderer)
* view = renderer.NativeView;
* }
*/
var point = gestureRecognizer.LocationOfTouch(i, view);
array[i] = point.ToPoint();
}
return(array);
}
void TransformingGestureDidBeginWithGesture(UIGestureRecognizer gesture)
{
inFullSizeMode = false;
if (inTransformingState && gesture is UIPinchGestureRecognizer)
{
pinchGesture.Scale = 2.5f;
}
if (inTransformingState)
{
inTransformingState = false;
transformingItem.SwitchToFullSizeMode(false);
CGAffineTransform newTransform = CGAffineTransform.MakeScale(2.5f, 2.5f);
transformingItem.ContentView.Transform = newTransform;
transformingItem.ContentView.Center = transformingItem.FullSizeView.Center;
}
else if (transformingItem==null)
{
PointF locationTouch = gesture.LocationOfTouch(0,this);
int positionTouch = layoutStrategy.ItemPositionFromLocation(locationTouch);
TransformingGestureDidBeginAtPosition(positionTouch);
}
}
public bool ShouldBegin(UIGestureRecognizer gestureRecognizer)
{
bool valid = true;
bool isScrolling = Dragging || Decelerating;
if (gestureRecognizer == tapGesture)
{
if (editing && disableEditOnEmptySpaceTap)
{
PointF locationTouch = tapGesture.LocationInView(this);
int position = layoutStrategy.ItemPositionFromLocation(locationTouch);
valid = (position == GMGV_INVALID_POSITION);
}
else
{
valid = !isScrolling && !editing && !longPressGesture.HasRecognizedValidGesture();
}
}
else if (gestureRecognizer == longPressGesture)
{
valid = (sortingDelegate!=null || enableEditOnLongPress) && !isScrolling && !editing;
}
else if (gestureRecognizer == sortingPanGesture)
{
valid = (sortMovingItem != null && longPressGesture.HasRecognizedValidGesture());
}
else if(gestureRecognizer == rotationGesture || gestureRecognizer == pinchGesture || gestureRecognizer == panGesture)
{
if (transformDelegate != null && gestureRecognizer.NumberOfTouches == 2)
{
PointF locationTouch1 = gestureRecognizer.LocationOfTouch(0,this);
PointF locationTouch2 = gestureRecognizer.LocationOfTouch(1,this);
int positionTouch1 = layoutStrategy.ItemPositionFromLocation(locationTouch1);
int positionTouch2 = layoutStrategy.ItemPositionFromLocation(locationTouch2);
valid = !editing && (IsInTransformingState || ((positionTouch1 == positionTouch2) && (positionTouch1 != GMGV_INVALID_POSITION)));
}
else
{
valid = false;
}
}
return valid;
}
