/// <summary>
/// This is a good enough approximation of updating the Rating based on where the user clicked. In reality this could be just a bit more accurate, but for now it's sufficient for my needs.
/// </summary>
private void UpdateRating(VisualElement view, BaseGestureEventArgs eventArgs)
{
double paddingLeft = 0, paddingRight = 0;
var layout = view as Layout;
if (layout != null)
{
paddingLeft = layout.Padding.Left;
paddingRight = layout.Padding.Right;
}
// First 2 IF statements: handle the cases where the user panned way out to the right or left (outside of this view, causing the percentX to really be <0 or >1
if (eventArgs.Center.X < paddingLeft)
{
Monitor.Debug($"Setting rating to 0 in respond to CenterX={eventArgs.Center.X} and Spacing={Spacing}");
Rating = 0;
}
else if (eventArgs.Center.X > view.Width - paddingRight)
{
Monitor.Debug($"Setting rating to 10 in respond to CenterX={eventArgs.Center.X} and pacing={Spacing} and Width={view.Width}");
Rating = 10;
}
else
{
var remainingWidth = view.Width - paddingLeft - paddingRight;
var adjustedX = eventArgs.Center.X - paddingLeft;
var percentX = adjustedX / remainingWidth;
// normal case
//var percentX = (eventArgs.Center.X - Padding.Left) / (view.Width - Padding.Left - Padding.Right);
Rating = (byte)Math.Round(percentX * 10);
Monitor.Debug($"Panned, Set Rating = {Rating} in response to {percentX}% CenterX={eventArgs.Center.X} Width={view.Width}");
}
}
public iOSPanEventArgs(UIPanGestureRecognizer gr, BaseGestureEventArgs previous)
{
Cancelled = (gr.State == UIGestureRecognizerState.Cancelled || gr.State == UIGestureRecognizerState.Failed);
ElementPosition = gr.View.BoundsInFormsCoord();
ElementTouches = iOSEventArgsHelper.GetTouches(gr, gr.View);
WindowTouches = iOSEventArgsHelper.GetTouches(gr, null);
CalculateDistances(previous);
Velocity = GetVelocity(gr);
}
public static Point[] GetTouches(MotionEvent.PointerCoords[] coords, BaseGestureEventArgs previous, Android.Views.View view, int[] startLocation)
{
int pointerCount = coords.Length;
if (pointerCount < 2 && previous != null)
{
System.Diagnostics.Debug.WriteLine("\tPointerCount < requiredTouches");
return(previous.Touches);
}
return(AndroidEventArgsHelper.GetTouches(coords, view, startLocation));
}
public AndroidPanEventArgs(MotionEvent previous, MotionEvent current, BaseGestureEventArgs prevArgs, Android.Views.View view, Listener listener)
{
Listener = listener;
Cancelled = (current.Action == MotionEventActions.Cancel);
ElementPosition = VisualElementExtensions.BoundsInWindowCoord(listener.Element);
ElementTouches = AndroidEventArgsHelper.GetTouches(current, view, listener);
//WindowTouches = AndroidEventArgsHelper.GetTouches(current, view, null);
WindowTouches = AndroidEventArgsHelper.GetRawTouches(current);
CalculateDistances(prevArgs);
Velocity = GetVelocity(previous, current);
}
public static Point[] GetTouches(MotionEvent.PointerCoords[] coords, BaseGestureEventArgs previous, Android.Views.View view, Listener listener)
{
int pointerCount = coords.Length;
if (pointerCount < 2 && previous != null)
{
System.Diagnostics.Debug.WriteLine("\tPointerCount < requiredTouches");
return(previous.ElementTouches);
}
return(GetTouches(coords, view, listener));
}
private void AddTouches(StringBuilder sb, BaseGestureEventArgs e)
{
sb.Append(", Touches: ");
if (e.Touches != null && e.Touches.Length > 0)
{
sb.Append(string.Join(", ", e.Touches.Select(t => $"{t.X:F}/{t.Y:F}")));
}
else
{
sb.Append("empty");
}
}
private void PrintBaseGestureEventArgs(BaseGestureEventArgs e)
{
#if DEBUG
for (int i = 0; i < e.TouchBlobs.Count; i++)
{
BlobInfo bi = e.TouchBlobs[i];
//AutoDebugger.WriteLine(bi.ToString());
}
//AutoDebugger.WriteLine("DebugGestureHandler: " + e.ToString());
#endif
}
public void ShowTouches(BaseGestureEventArgs e, Color color)
{
foreach (var box in _touchIndicators)
{
relativeLayout.Children.Remove(box);
}
for (var i = 0; i < e.WindowTouches.Length; i++)
{
ShowBox(e.WindowTouches[i], color);
}
}
public static Xamarin.Forms.Point[] GetTouches(this UIGestureRecognizer gestureRecognizer, UIView view, int requiredTouches, BaseGestureEventArgs previous)
{
nint numberOfTouches = gestureRecognizer.NumberOfTouches;
if (numberOfTouches < requiredTouches && previous != null)
{
return(view == null
? previous.WindowTouches
: previous.ElementTouches);
}
return(iOSEventArgsHelper.GetTouches(gestureRecognizer, view));
}
protected string GetElementName(BaseGestureEventArgs e)
{
return(e.Sender.GetType().Name + " " + ((Element)e.Sender).Id);
}
protected string GetElementName(BaseGestureEventArgs e)
{
return e.Sender.GetType().Name + " " + ((Element)e.Sender).Id;
}
public static Xamarin.Forms.Point[] GetTouches(UIGestureRecognizer gestureRecognizer, int requiredTouches, BaseGestureEventArgs previous, CGPoint locationAtStart)
{
nint numberOfTouches = gestureRecognizer.NumberOfTouches;
if (numberOfTouches < requiredTouches && previous != null)
{
return(previous.Touches);
}
return(iOSEventArgsHelper.GetTouches(gestureRecognizer, locationAtStart));
}
