# all files / bpmn-js/lib/features/modeling/behavior/util/ ResizeUtil.js

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     import { is } from '../../../../util/ModelUtil';

    import {
      asTRBL
    } from 'diagram-js/lib/layout/LayoutUtil';

    import {
      collectLanes,
      getLanesRoot
    } from '../../../modeling/util/LaneUtil';

    var abs = Math.abs,
        min = Math.min,
        max = Math.max;

    function addToTrbl(trbl, attr, value, choice) {
      var current = trbl[attr];

      // make sure to set the value if it does not exist
      // or apply the correct value by comparing against
      // choice(value, currentValue)
      trbl[attr] = current === undefined ? value : choice(value, current);
    }

    function addMin(trbl, attr, value) {
      return addToTrbl(trbl, attr, value, min);
    }

    function addMax(trbl, attr, value) {
      return addToTrbl(trbl, attr, value, max);
    }

    var LANE_MIN_HEIGHT = 60,
        LANE_MIN_WIDTH = 300,
        LANE_RIGHT_PADDING = 20,
        LANE_LEFT_PADDING = 50,
        LANE_TOP_PADDING = 20,
        LANE_BOTTOM_PADDING = 20;

    export function getParticipantResizeConstraints(laneShape, resizeDirection, balanced) {
      var lanesRoot = getLanesRoot(laneShape);

      var isFirst = true,
          isLast = true;

      // max top/bottom size for lanes
      var allLanes = collectLanes(lanesRoot, [ lanesRoot ]);

      var laneTrbl = asTRBL(laneShape);

      var maxTrbl = {},
          minTrbl = {};

      if (/e/.test(resizeDirection)) {
        minTrbl.right = laneTrbl.left + LANE_MIN_WIDTH;
      } else
      if (/w/.test(resizeDirection)) {
        minTrbl.left = laneTrbl.right - LANE_MIN_WIDTH;
      }

      allLanes.forEach(function(other) {

        var otherTrbl = asTRBL(other);

        if (/n/.test(resizeDirection)) {

          if (otherTrbl.top < (laneTrbl.top - 10)) {
            isFirst = false;
          }

          // max top size (based on next element)
          if (balanced && abs(laneTrbl.top - otherTrbl.bottom) < 10) {
            addMax(maxTrbl, 'top', otherTrbl.top + LANE_MIN_HEIGHT);
          }

          // min top size (based on self or nested element)
          if (abs(laneTrbl.top - otherTrbl.top) < 5) {
            addMin(minTrbl, 'top', otherTrbl.bottom - LANE_MIN_HEIGHT);
          }
        }

        if (/s/.test(resizeDirection)) {

          if (otherTrbl.bottom > (laneTrbl.bottom + 10)) {
            isLast = false;
          }

          // max bottom size (based on previous element)
          if (balanced && abs(laneTrbl.bottom - otherTrbl.top) < 10) {
            addMin(maxTrbl, 'bottom', otherTrbl.bottom - LANE_MIN_HEIGHT);
          }

          // min bottom size (based on self or nested element)
          if (abs(laneTrbl.bottom - otherTrbl.bottom) < 5) {
            addMax(minTrbl, 'bottom', otherTrbl.top + LANE_MIN_HEIGHT);
          }
        }
      });

      // max top/bottom/left/right size based on flow nodes
      var flowElements = lanesRoot.children.filter(function(s) {
        return !s.hidden && !s.waypoints && (is(s, 'bpmn:FlowElement') || is(s, 'bpmn:Artifact'));
      });

      flowElements.forEach(function(flowElement) {

        var flowElementTrbl = asTRBL(flowElement);

        if (isFirst && /n/.test(resizeDirection)) {
          addMin(minTrbl, 'top', flowElementTrbl.top - LANE_TOP_PADDING);
        }

        if (/e/.test(resizeDirection)) {
          addMax(minTrbl, 'right', flowElementTrbl.right + LANE_RIGHT_PADDING);
        }

        if (isLast && /s/.test(resizeDirection)) {
          addMax(minTrbl, 'bottom', flowElementTrbl.bottom + LANE_BOTTOM_PADDING);
        }

        if (/w/.test(resizeDirection)) {
          addMin(minTrbl, 'left', flowElementTrbl.left - LANE_LEFT_PADDING);
        }
      });

      return {
        min: minTrbl,
        max: maxTrbl
      };
    }