update method
Updates the gesture when gesture detection is happening.
Implementation
@override
void update(Offset delta) {
if (!_triggered) {
_gestureX += delta.dx;
_gestureY += delta.dy;
if ((direction == AxisDirection.left && _gestureX <= -triggerDistance) ||
(direction == AxisDirection.right && _gestureX >= triggerDistance) ||
(direction == AxisDirection.up && _gestureY <= -triggerDistance) ||
(direction == AxisDirection.down && _gestureY >= triggerDistance)) {
_triggered = true;
_gestureX = 0;
_gestureY = 0;
}
if (!_triggered) return;
}
if (_failed) return;
_gestureX += delta.dx;
_gestureY += delta.dy;
if ((_counterAxis == Axis.horizontal && _gestureX.abs() >= failDistance) ||
(_counterAxis == Axis.vertical && _gestureY.abs() >= failDistance)) {
_failed = true;
return;
}
if ((direction == AxisDirection.left && _gestureX < -distance) ||
(direction == AxisDirection.right && _gestureX > distance) ||
(direction == AxisDirection.up && _gestureY < -distance) ||
(direction == AxisDirection.down && _gestureY > distance)) {
_complete = true;
}
}