private void MTouch_Release(object sender, TouchActionEventArgs args)
{
if (State == eControlInputState.ePressed)
{
OnClicked(this, EventArgs.Empty);
}
State = eControlInputState.eNone;
}
void RemoveCursor(TouchActionEventArgs args)
{
Cursors.Remove(args.ID);
if (Mode == TouchMode.Pinch)
{
PinchProcessor.Clear();
if (Cursors.Count == 1)
{
Mode = TouchMode.Pan;
}
}
if (Cursors.Count == 0)
{
Mode = TouchMode.Normal;
}
}
public void OnTouchAction(Element e, TouchActionEventArgs a)
{
var type = a.Location.TouchType;
var change = type != PreviousType;
switch (type)
{
case TouchPoint.eTouchType.eMoved:
switch (PreviousType)
{
case TouchPoint.eTouchType.eReleased:
SafeHover(e, a);
break;
case TouchPoint.eTouchType.ePressed:
SafePressedMove(e, a);
break;
default:
throw (new Exception("Cannot determine previous state. It must be pressed or released"));
}
break;
case TouchPoint.eTouchType.ePressed:
if (change)
{
SafePressed(e, a);
}
break;
case TouchPoint.eTouchType.eReleased:
SafeReleased(e, a);
break;
default:
throw (new Exception("Do not issue commands other than pressed, released and move from a device."));
}
//Moved is not a state change
if (type != TouchPoint.eTouchType.eMoved)
{
PreviousType = type;
}
}
//Common handlers
public void RaiseAction(TouchActionEventArgs Action)
{
OnTouchAction(Element, Action);
}
private void SafeReleased(Element element, TouchActionEventArgs args)
{
//Stop the tap timer
RemoveCursor(args);
PlainEvent(Released, element, args);
}
private void SafePressedMove(Element element, TouchActionEventArgs args)
{
ProcessCursor(args);
SafeEvent(PressedMoved, element, args);
}
//Calls the safe event function for the event
private void SafeHover(Element element, TouchActionEventArgs args)
{
PlainEvent(Hover, element, args);
}
private void SafePressed(Element element, TouchActionEventArgs args)
{
//Start the tap timer
TapProcess();
PlainEvent(Pressed, element, args);
}
//Triggers a threadsafe event
private void SafeEvent(TouchActionEventHandler EventFunction, Element element, TouchActionEventArgs args)
{
if (EventFunction != null)
{
Device.BeginInvokeOnMainThread(() => {
EventFunction?.Invoke(element, args);
});
}
}
private void PlainEvent(TouchActionEventHandler EventFunction, Element element, TouchActionEventArgs args)
{
if (Mode == TouchMode.Normal)
{
SafeEvent(EventFunction, element, args);
}
}
void ProcessCursor(TouchActionEventArgs args)
{
if (!Cursors.ContainsKey(args.ID))
{
Cursors.Add(args.ID, new TouchCursor(args.Location));
if (Cursors.Count >= 2)
{
Mode = TouchMode.Pinch;
}
}
else
{
var item1 = Cursors[args.ID];
TouchCursor item2 = item1;
foreach (var cursor in Cursors)
{
if (cursor.Key != args.ID)
{
item2 = cursor.Value;
}
}
var dx = args.Location.Position.X - item1.Position.X;
var dy = args.Location.Position.Y - item1.Position.Y;
item1.Position = args.Location.Position;
switch (Cursors.Count)
{
case 0:
Mode = TouchMode.Normal;
break;
case 1:
{
var temp = new TouchPanActionEventArgs(dx, dy);
var dist = temp.Distance;
if (dist > 0)
{
if (Mode == TouchMode.Pan || temp.Distance > GestureThreshold)
{
TapCancel();
Debug.WriteLine("Pan Enabled");
Mode = TouchMode.Pan;
Pan?.Invoke(this, temp);
}
}
} break;
case 2:
{
var temp = new TouchPinchActionEventArgs(PinchProcessor);
if (temp.Pinch.DistanceDelta >= 0)
{
Mode = TouchMode.Pinch;
if (PinchProcessor.Set(item1.Position, item2.Position))
{
TapCancel();
Pinch?.Invoke(this, temp);
}
}
} break;
default:
Debug.WriteLine("To many cursors.");
break;
}
}
}
private void MTouch_Press(object sender, TouchActionEventArgs args)
{
}
private void MTouch_Release(object sender, TouchActionEventArgs args) => State = eControlInputState.eNone;
private void MTouch_Hover(object sender, TouchActionEventArgs args) => State = eControlInputState.eHover;
private void MTouch_Pressed(object sender, TouchActionEventArgs args) => State = eControlInputState.ePressed;
private void MTouch_Release(object sender, TouchActionEventArgs args)
{
}
private void MTouch_Hover(object sender, TouchActionEventArgs args)
{
}
