onTouchEvent method

bool onTouchEvent(PointerEvent event)

Implementation

bool onTouchEvent(PointerEvent event) {
  var handle = false;
  if (event is PointerDownEvent) {
    // down
    if (_gestureCallback.needHandle(GestureType.pressIn)) {
      noPressIn = false;
      _lastPressInX = event.position.dx;
      _lastPressInY = event.position.dy;
      _handler.sendDelayMessage(GestureType.pressIn, () {
        _gestureCallback.handle(GestureType.pressIn, -1, -1);
      });
      handle = true;
    } else {
      noPressIn = true;
    }

    if (_gestureCallback.needHandle(GestureType.touchDown)) {
      _gestureCallback.handle(
        GestureType.touchDown,
        event.position.dx,
        event.position.dy,
      );
      handle = true;
    }

    if (!handle && _gestureCallback.needHandle(GestureType.touchMove)) {
      handle = true;
    }

    if (!handle && _gestureCallback.needHandle(GestureType.touchEnd)) {
      handle = true;
    }

    if (!handle && _gestureCallback.needHandle(GestureType.touchCancel)) {
      handle = true;
    }
  } else if (event is PointerMoveEvent) {
    // move
    if (_gestureCallback.needHandle(GestureType.touchMove)) {
      _gestureCallback.handle(
        GestureType.touchMove,
        event.position.dx,
        event.position.dy,
      );
      handle = true;
    }

    if (!handle && _gestureCallback.needHandle(GestureType.touchEnd)) {
      handle = true;
    }

    if (!handle && _gestureCallback.needHandle(GestureType.touchCancel)) {
      handle = true;
    }

    if (!noPressIn) {
      var distX = (event.position.dx - _lastPressInX).abs();
      var distY = (event.position.dy - _lastPressInY).abs();
      if (distX > kTouchSlop || distY > kTouchSlop) {
        _handler.removeMessage(GestureType.pressIn);
        noPressIn = true;
      }
    }
  } else if (event is PointerUpEvent) {
    // up
    if (_gestureCallback.needHandle(GestureType.touchEnd)) {
      _gestureCallback.handle(
        GestureType.touchEnd,
        event.position.dx,
        event.position.dy,
      );
      handle = true;
    }

    if (noPressIn && _gestureCallback.needHandle(GestureType.pressOut)) {
      _gestureCallback.handle(
        GestureType.pressOut,
        event.position.dx,
        event.position.dy,
      );
      handle = true;
    } else if (!noPressIn && _gestureCallback.needHandle(GestureType.pressOut)) {
      _handler.sendDelayMessage(GestureType.pressOut, () {
        _gestureCallback.handle(GestureType.pressOut, -1, -1);
      });
      handle = true;
    }
  } else if (event is PointerCancelEvent) {
    // cancel
    if (_gestureCallback.needHandle(GestureType.touchCancel)) {
      _gestureCallback.handle(
        GestureType.touchCancel,
        event.position.dx,
        event.position.dy,
      );
      handle = true;
    }

    if (noPressIn && _gestureCallback.needHandle(GestureType.pressOut)) {
      _gestureCallback.handle(
        GestureType.pressOut,
        event.position.dx,
        event.position.dy,
      );
      handle = true;
    } else if (!noPressIn && _gestureCallback.needHandle(GestureType.pressOut)) {
      _handler.removeMessage(GestureType.pressIn);
      _handler.sendDelayMessage(GestureType.pressOut, () {
        _gestureCallback.handle(GestureType.pressOut, -1, -1);
      });
      handle = true;
    }
  }
  return handle;
}