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Mixins are a useful tool not only to repeat redundant code but in some instances can also to isolate large related chunks of code that otherwise might bloat a component.

Table of Content

Selection Mixin

Selection Mixin

Isolates the parent selection logic responsible for managing the selection state and passing it down to selectable children.

Child items inheriting props from the selection system/filters generally use a isSelectable() function in the computed section of a component. However, additional computed values may further derive state from isSelectable or from the inherited props as well for additional functionality.



// Enum for the set of modes
const Modes = {
  COPY: 1,
  BIND: 2,
  SWAP: 3,
// Enum for the set of selectable types
const Select = {
  NONE: 0,
  ANY: 1,
  SCENE: 2,


defines the master object that defines all the state information in the following format

[Modes.my_mode]: {                  // Name Object using an enum from Modes
  type: Number,                     // Select Enum for valid type (use `Select.ANY` for all)
  filters: [String, ...],           // Array of string filters
  actions: {                        // Holds action set that to define what action each allowed select type uses
    [Select.my_select]: function,
  messages: [                       // Defines messages to display before/after
    'Select an element to copy from',
    'Select element(s) to paste to'



Description: Resets the state for selection management so it’s empty

addToSelection(eventId, selectedType) {
  eventId       // emitted id of item just selected
  selectedType  // type corresponding to the id of the item emitted

Description: Handles adding an item to the selection system

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