# all files / Github/bpmn-js/lib/features/modeling/behavior/ ToggleElementCollapseBehaviour.js

91.11% Statements 41/45
83.33% Branches 15/18
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     import inherits from 'inherits';

    import CommandInterceptor from 'diagram-js/lib/command/CommandInterceptor';

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

    import {
      computeChildrenBBox
    } from 'diagram-js/lib/features/resize/ResizeUtil';

    var LOW_PRIORITY = 500;

    export default function ToggleElementCollapseBehaviour(
        eventBus, elementFactory, modeling,
        resize) {

      CommandInterceptor.call(this, eventBus);

      function hideEmptyLables(children) {
        if (children.length) {
          children.forEach(function(child) {
            Iif (child.type === 'label' && !child.businessObject.name) {
              child.hidden = true;
            }
          });
        }
      }

      function expandedBounds(shape, defaultSize) {
        var children = shape.children,
            newBounds = defaultSize,
            visibleElements,
            visibleBBox;

        visibleElements = filterVisible(children).concat([ shape ]);

        visibleBBox = computeChildrenBBox(visibleElements);

        Eif (visibleBBox) {
          // center to visibleBBox with max(defaultSize, childrenBounds)
          newBounds.width = Math.max(visibleBBox.width, newBounds.width);
          newBounds.height = Math.max(visibleBBox.height, newBounds.height);

          newBounds.x = visibleBBox.x + (visibleBBox.width - newBounds.width) / 2;
          newBounds.y = visibleBBox.y + (visibleBBox.height - newBounds.height) / 2;
        } else {
          // center to collapsed shape with defaultSize
          newBounds.x = shape.x + (shape.width - newBounds.width) / 2;
          newBounds.y = shape.y + (shape.height - newBounds.height) / 2;
        }

        return newBounds;
      }

      function collapsedBounds(shape, defaultSize) {

        return {
          x: shape.x + (shape.width - defaultSize.width) / 2,
          y: shape.y + (shape.height - defaultSize.height) / 2,
          width: defaultSize.width,
          height: defaultSize.height
        };
      }

      this.executed([ 'shape.toggleCollapse' ], LOW_PRIORITY, function(e) {

        var context = e.context,
            shape = context.shape;

        Iif (!is(shape, 'bpmn:SubProcess')) {
          return;
        }

        if (!shape.collapsed) {
          // all children got made visible through djs, hide empty labels
          hideEmptyLables(shape.children);

          // remove collapsed marker
          getBusinessObject(shape).di.isExpanded = true;
        } else {
          // place collapsed marker
          getBusinessObject(shape).di.isExpanded = false;
        }
      });

      this.reverted([ 'shape.toggleCollapse' ], LOW_PRIORITY, function(e) {

        var context = e.context;
        var shape = context.shape;

        // revert removing/placing collapsed marker
        if (!shape.collapsed) {
          getBusinessObject(shape).di.isExpanded = true;

        } else {
          getBusinessObject(shape).di.isExpanded = false;
        }
      });

      this.postExecuted([ 'shape.toggleCollapse' ], LOW_PRIORITY, function(e) {
        var shape = e.context.shape,
            defaultSize = elementFactory._getDefaultSize(shape),
            newBounds;

        if (shape.collapsed) {

          // resize to default size of collapsed shapes
          newBounds = collapsedBounds(shape, defaultSize);
        } else {

          // resize to bounds of max(visible children, defaultSize)
          newBounds = expandedBounds(shape, defaultSize);
        }

        modeling.resizeShape(shape, newBounds, null, {
          autoResize: shape.collapsed ? false : 'nwse'
        });
      });

    }

    inherits(ToggleElementCollapseBehaviour, CommandInterceptor);

    ToggleElementCollapseBehaviour.$inject = [
      'eventBus',
      'elementFactory',
      'modeling'
    ];

    // helpers //////////////////////

    function filterVisible(elements) {
      return elements.filter(function(e) {
        return !e.hidden;
      });
    }