private static bool IsInContact(MotionEvent nativeEvent, PointerDeviceType pointerType, MotionEventActions action, MotionEventButtonState buttons)
{
switch (pointerType)
{
case PointerDeviceType.Mouse:
// For mouse, we cannot only rely on action: We will get a "HoverExit" when we press the left button.
return(buttons != 0);
case PointerDeviceType.Pen:
return(nativeEvent.GetAxisValue(Axis.Distance, nativeEvent.ActionIndex) == 0);
default:
case PointerDeviceType.Touch:
// WARNING: MotionEventActions.Down == 0, so action.HasFlag(MotionEventActions.Up) is always true!
return(!action.HasFlag(MotionEventActions.Up) &&
!action.HasFlag(MotionEventActions.PointerUp) &&
!action.HasFlag(MotionEventActions.Cancel));
}
}
private PointerPointProperties GetProperties(MotionEventToolType type, MotionEventActions action, MotionEventButtonState buttons)
{
var props = new PointerPointProperties
{
IsPrimary = true,
IsInRange = Pointer.IsInRange
};
var isDown = action == /* 0 = */ MotionEventActions.Down || action.HasFlag(MotionEventActions.PointerDown);
var isUp = action.HasFlag(MotionEventActions.Up) || action.HasFlag(MotionEventActions.PointerUp);
var updates = _none;
switch (type)
{
case MotionEventToolType.Finger:
case MotionEventToolType.Unknown: // used by Xamarin.UITest
props.IsLeftButtonPressed = Pointer.IsInContact;
updates = isDown ? _fingerDownUpdates : isUp ? _fingerUpUpdates : _none;
// Pressure = .5f => Keeps default as UWP returns .5 for fingers.
break;
case MotionEventToolType.Mouse:
props.IsLeftButtonPressed = buttons.HasFlag(MotionEventButtonState.Primary);
props.IsMiddleButtonPressed = buttons.HasFlag(MotionEventButtonState.Tertiary);
props.IsRightButtonPressed = buttons.HasFlag(MotionEventButtonState.Secondary);
updates = isDown ? _mouseDownUpdates : isUp ? _mouseUpUpdates : _none;
// Pressure = .5f => Keeps default as UWP returns .5 for Mouse no matter is button is pressed or not (Android return 1.0 while pressing a button, but 0 otherwise).
break;
// Note: On UWP, if you touch screen while already holding the barrel button, you will get a right + barrel,
// ** BUT ** if you touch screen and THEN press the barrel button props will be left + barrel until released.
// On Android this distinction seems to be flagged by the "1101 ****" action flag (i.e. "StylusWithBarrel***" actions),
// so here we set the Is<Left|Right>ButtonPressed based on the action and we don't try to link it to the barrel button state.
case MotionEventToolType.Stylus when action == StylusWithBarrelDown:
case MotionEventToolType.Stylus when action == StylusWithBarrelMove:
case MotionEventToolType.Stylus when action == StylusWithBarrelUp:
// Note: We still validate the "IsButtonPressed(StylusPrimary)" as the user might release the button while pressed.
// In that case we will still receive moves and up with the "StylusWithBarrel***" actions.
props.IsBarrelButtonPressed = buttons.HasFlag(MotionEventButtonState.StylusPrimary);
props.IsRightButtonPressed = Pointer.IsInContact;
props.Pressure = Math.Min(1f, _nativeEvent.GetPressure(_pointerIndex)); // Might exceed 1.0 on Android
break;
case MotionEventToolType.Stylus:
props.IsBarrelButtonPressed = buttons.HasFlag(MotionEventButtonState.StylusPrimary);
props.IsLeftButtonPressed = Pointer.IsInContact;
props.Pressure = Math.Min(1f, _nativeEvent.GetPressure(_pointerIndex)); // Might exceed 1.0 on Android
break;
case MotionEventToolType.Eraser:
props.IsEraser = true;
props.Pressure = Math.Min(1f, _nativeEvent.GetPressure(_pointerIndex)); // Might exceed 1.0 on Android
break;
default:
break;
}
if (updates.TryGetValue(_nativeEvent.ActionButton, out var update))
{
props.PointerUpdateKind = update;
}
return(props);
}
