tapspace/lib/loaders/TreeLoader/remapChildren.js

A zoomable user interface lib for web apps

module.exports = function (parentId) {
  // @TreeLoader:remapChildren(parentId)
  //
  // Update placements of children of the given parent.
  // Transform the children to match their new bases.
  // Internally, calls mapper to find the new bases.
  // Synchronous.
  //
  // Parameters:
  //   parentId
  //     a string
  //

  // Space may be removed.
  const parentSpace = this.spaces[parentId]
  if (!parentSpace) {
    return
  }

  // Find children
  const childIds = this.tracker(parentId, parentSpace)

  childIds.forEach(childId => {
    // Update only existing children.
    const childSpace = this.spaces[childId]
    if (!childSpace) {
      return
    }

    // Find the new basis for the child.
    let basis = this.mapper(parentId, parentSpace, childId)

    if (!basis) {
      // Try backmapper
      const insertionBasis = this.backmapper(childId, childSpace, parentId)
      if (insertionBasis) {
        const childBasis = childSpace.getBasis()
        basis = insertionBasis.getMatchedOuter(childBasis)
      }
    }

    childSpace.setBasis(basis)
  })
}