janus/lib/collection/derived/mapped-list.js

the two-faced application library-framework

// Generated by CoffeeScript 1.12.2
(function() {
  var DerivedList, FlatMappedList, List, MappedList, Varying, ref,
    extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
    hasProp = {}.hasOwnProperty;

  ref = require('../list'), List = ref.List, DerivedList = ref.DerivedList;

  Varying = require('../../core/varying').Varying;

  MappedList = (function(superClass) {
    extend(MappedList, superClass);

    function MappedList(parent, mapper, options) {
      var elem, i, len, ref1;
      this.parent = parent;
      this.mapper = mapper;
      this.options = options != null ? options : {};
      MappedList.__super__.constructor.call(this);
      this.destroyWith(this.parent);
      ref1 = this.parent.list;
      for (i = 0, len = ref1.length; i < len; i++) {
        elem = ref1[i];
        this._add(elem);
      }
      this.listenTo(this.parent, 'added', (function(_this) {
        return function(elem, idx) {
          return _this._add(elem, idx);
        };
      })(this));
      this.listenTo(this.parent, 'moved', (function(_this) {
        return function(_, idx, oldIdx) {
          return _this._moveAt(oldIdx, idx);
        };
      })(this));
      this.listenTo(this.parent, 'removed', (function(_this) {
        return function(_, idx) {
          return _this._removeAt(idx);
        };
      })(this));
    }

    MappedList.prototype._add = function(elem, idx) {
      MappedList.__super__._add.call(this, this.mapper(elem), idx);
    };

    return MappedList;

  })(DerivedList);

  FlatMappedList = (function(superClass) {
    extend(FlatMappedList, superClass);

    function FlatMappedList(parent, mapper, options) {
      var elem, i, idx, len, ref1;
      this.parent = parent;
      this.mapper = mapper;
      this.options = options != null ? options : {};
      FlatMappedList.__super__.constructor.call(this);
      this._bindings = new List();
      ref1 = this.parent.list;
      for (idx = i = 0, len = ref1.length; i < len; idx = ++i) {
        elem = ref1[idx];
        this._add(elem, idx);
      }
      this.listenTo(this.parent, 'added', (function(_this) {
        return function(elem, idx) {
          return _this._add(elem, idx);
        };
      })(this));
      this.listenTo(this.parent, 'removed', (function(_this) {
        return function(_, idx) {
          return _this._removeAt(idx);
        };
      })(this));
      this.listenTo(this.parent, 'moved', (function(_this) {
        return function(_, idx, oldIdx) {
          return _this._moveAt(oldIdx, idx);
        };
      })(this));
    }

    FlatMappedList.prototype._add = function(elem, idx) {
      var binding, initial, mapping, wrapped;
      wrapped = new Varying(elem);
      initial = null;
      mapping = wrapped.flatMap(this.mapper);
      binding = this.reactTo(mapping, (function(_this) {
        return function(newValue) {
          var bidx;
          if (initial == null) {
            initial = newValue;
          }
          bidx = _this._bindings.list.indexOf(binding);
          if (bidx >= 0) {
            return _this._set(bidx, newValue);
          }
        };
      })(this));
      this._bindings.add(binding, idx);
      FlatMappedList.__super__._add.call(this, [initial], idx);
    };

    FlatMappedList.prototype._removeAt = function(idx) {
      this._bindings.removeAt(idx).stop();
      FlatMappedList.__super__._removeAt.call(this, idx);
    };

    FlatMappedList.prototype._moveAt = function(oldIdx, idx) {
      this._bindings.moveAt(oldIdx, idx);
      FlatMappedList.__super__._moveAt.call(this, oldIdx, idx);
    };

    return FlatMappedList;

  })(DerivedList);

  module.exports = {
    MappedList: MappedList,
    FlatMappedList: FlatMappedList
  };

}).call(this);