initGestureConfigHandler居中问题 about extended_image HOT 12 CLOSED

        print("==================");
        print(gestureDetails.movePage(delta));
        print(currentPage != pageController.page);
        print( widget.canMovePage(gestureDetails));
        print("==================");
        if ((gestureDetails.movePage(delta) ||
                (currentPage != pageController.page)) &&
            widget.canMovePage(gestureDetails)) {
          _drag?.update(details);
        } else {
          if (currentPage == pageController.page) {
            extendedImageGestureState.gestureDetails = GestureDetails(
                offset: gestureDetails.offset +
                    delta * extendedImageGestureState.imageGestureConfig.speed,
                totalScale: gestureDetails.totalScale,
                gestureDetails: gestureDetails);
          }
        }

  bool movePage(Offset delta) {
    print(delta);
    print(boundary);
    print(_computeHorizontalBoundary);
    bool canMoveHorizontal = delta.dx != 0 &&
        ((delta.dx < 0 && boundary.right) ||
            (delta.dx > 0 && boundary.left) ||
            !_computeHorizontalBoundary);

    bool canMoveVertical = delta.dy != 0 &&
        ((delta.dy < 0 && boundary.bottom) ||
            (delta.dy > 0 && boundary.top) ||
            !_computeVerticalBoundary);

    return canMoveHorizontal || canMoveVertical || totalScale <= 1.0;
  }

if (_computeHorizontalBoundary) {
      //move right
      if (result.left > layoutRect.left) {
        result = Rect.fromLTWH(
            layoutRect.left, result.top, result.width, result.height);
        _boundary.left = true;
      }

      ///move left
      if (result.right <= layoutRect.right) {
        result = Rect.fromLTWH(layoutRect.right - result.width, result.top,
            result.width, result.height);
        _boundary.right = true;
      }
    }