isThrowText method
decided whether the text is deleted or not.
Implementation
bool isThrowText(Offset pointer,BaseFloatModel target) {
final Rect textR = Rect.fromCenter(center: pointer,
width: target.floatSize?.width??1,
height: target.floatSize?.height??1);
final Rect tcR = Rect.fromLTWH(
screenSize!.width - trashCanPosition.dx,
screenSize!.height - trashCanPosition.dy - tcSize.height,
tcSize.width,
tcSize.height);
return textR.overlaps(tcR);
}