private TouchableSpan GetTouchableSpan(TextView textView, ISpannable span, MotionEvent e)
{
var x = (int)e.GetX();
var y = (int)e.GetY();
x -= textView.TotalPaddingLeft;
y -= textView.TotalPaddingTop;
x += textView.ScrollX;
y += textView.ScrollY;
var touchedLine = textView.Layout.GetLineForVertical(y);
var touchOffset = textView.Layout.GetOffsetForHorizontal(touchedLine, x);
_touchBounds.Left = textView.Layout.GetLineLeft(touchedLine);
_touchBounds.Top = textView.Layout.GetLineTop(touchedLine);
_touchBounds.Right = textView.Layout.GetLineRight(touchedLine);
_touchBounds.Bottom = textView.Layout.GetLineBottom(touchedLine);
TouchableSpan touchableSpan = null;
if (_touchBounds.Contains(x, y))
{
var spans = span.GetSpans(touchOffset, touchOffset, Java.Lang.Class.FromType(typeof(TouchableSpan)));
touchableSpan = spans.Length > 0 ? (TouchableSpan)spans[0] : null;
}
return(touchableSpan);
}
public override bool OnTouchEvent(TextView widget, ISpannable buffer, MotionEvent e)
{
switch (e.Action)
{
case MotionEventActions.Down:
_pressedSpan = GetTouchableSpan(widget, buffer, e);
if (_pressedSpan != null)
{
_pressedSpan.Pressed = true;
Selection.SetSelection(buffer, buffer.GetSpanStart(_pressedSpan), buffer.GetSpanEnd(_pressedSpan));
}
break;
case MotionEventActions.Move:
var _pressedSpanM = GetTouchableSpan(widget, buffer, e);
if (_pressedSpan != null && _pressedSpanM != _pressedSpan)
{
_pressedSpan.Pressed = false;
_pressedSpan = null;
Selection.RemoveSelection(buffer);
}
break;
default:
if (_pressedSpan != null)
{
_pressedSpan.Pressed = false;
base.OnTouchEvent(widget, buffer, e);
}
_pressedSpan = null;
Selection.RemoveSelection(buffer);
break;
}
return(true);
}
