relocateSecondary method

Implementation

void relocateSecondary() {
  if (secondaryAlignment.value == null &&
      secondaryDragged.isFalse &&
      !_secondaryRelocated) {
    _secondaryRelocated = true;

    Rect? secondaryBounds, dockBounds;

    try {
      secondaryBounds = secondaryKey.globalPaintBounds;
      dockBounds = dockKey.globalPaintBounds;
    } catch (_) {
      // No-op.
    }

    Rect intersect =
        secondaryBounds?.intersect(dockBounds ?? Rect.zero) ?? Rect.zero;

    intersect = Rect.fromLTWH(
      intersect.left,
      intersect.top,
      intersect.width,
      intersect.height + 10,
    );

    if (intersect.width > 0 && intersect.height > 0) {
      secondaryBottomShifted ??=
          secondaryBottom.value ??
          size.height - secondaryTop.value! - secondaryHeight.value;

      // Intersection is non-zero, so move the secondary panel up.
      if (secondaryBottom.value != null) {
        secondaryBottom.value = secondaryBottom.value! + intersect.height;
      } else {
        secondaryTop.value = secondaryTop.value! - intersect.height;
      }

      applySecondaryConstraints();
    } else if ((intersect.height < 0 || intersect.width < 0) &&
        secondaryBottomShifted != null) {
      // Intersection is less than zero and the secondary panel is higher than
      // it was before, so move it to its original position.
      double bottom =
          secondaryBottom.value ??
          size.height - secondaryTop.value! - secondaryHeight.value;

      if (bottom > secondaryBottomShifted!) {
        double difference = bottom - secondaryBottomShifted!;
        if (secondaryBottom.value != null) {
          if (difference.abs() < intersect.height.abs() ||
              intersect.width < 0) {
            secondaryBottom.value = secondaryBottomShifted;
            secondaryBottomShifted = null;
          } else {
            secondaryBottom.value =
                secondaryBottom.value! - intersect.height.abs();
          }
        } else {
          if (difference.abs() < intersect.height.abs() ||
              intersect.width < 0) {
            secondaryTop.value =
                size.height - secondaryHeight.value - secondaryBottomShifted!;
            secondaryBottomShifted = null;
          } else {
            secondaryTop.value = secondaryTop.value! + intersect.height.abs();
          }
        }

        applySecondaryConstraints();
      }
    }

    SchedulerBinding.instance.addPostFrameCallback(
      (_) => _secondaryRelocated = false,
    );
  }
}