aurelia-bootstrap/doc/jspm_packages/npm/aurelia-templating-resources@1.2.0/map-repeat-strategy.js

Bootstrap components written in Aurelia.

/* */ 
define(['exports', './repeat-utilities'], function (exports, _repeatUtilities) {
  'use strict';

  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.MapRepeatStrategy = undefined;

  

  var MapRepeatStrategy = exports.MapRepeatStrategy = function () {
    function MapRepeatStrategy() {
      
    }

    MapRepeatStrategy.prototype.getCollectionObserver = function getCollectionObserver(observerLocator, items) {
      return observerLocator.getMapObserver(items);
    };

    MapRepeatStrategy.prototype.instanceChanged = function instanceChanged(repeat, items) {
      var _this = this;

      var removePromise = repeat.removeAllViews(true, !repeat.viewsRequireLifecycle);
      if (removePromise instanceof Promise) {
        removePromise.then(function () {
          return _this._standardProcessItems(repeat, items);
        });
        return;
      }
      this._standardProcessItems(repeat, items);
    };

    MapRepeatStrategy.prototype._standardProcessItems = function _standardProcessItems(repeat, items) {
      var index = 0;
      var overrideContext = void 0;

      items.forEach(function (value, key) {
        overrideContext = (0, _repeatUtilities.createFullOverrideContext)(repeat, value, index, items.size, key);
        repeat.addView(overrideContext.bindingContext, overrideContext);
        ++index;
      });
    };

    MapRepeatStrategy.prototype.instanceMutated = function instanceMutated(repeat, map, records) {
      var key = void 0;
      var i = void 0;
      var ii = void 0;
      var overrideContext = void 0;
      var removeIndex = void 0;
      var record = void 0;
      var rmPromises = [];
      var viewOrPromise = void 0;

      for (i = 0, ii = records.length; i < ii; ++i) {
        record = records[i];
        key = record.key;
        switch (record.type) {
          case 'update':
            removeIndex = this._getViewIndexByKey(repeat, key);
            viewOrPromise = repeat.removeView(removeIndex, true, !repeat.viewsRequireLifecycle);
            if (viewOrPromise instanceof Promise) {
              rmPromises.push(viewOrPromise);
            }
            overrideContext = (0, _repeatUtilities.createFullOverrideContext)(repeat, map.get(key), removeIndex, map.size, key);
            repeat.insertView(removeIndex, overrideContext.bindingContext, overrideContext);
            break;
          case 'add':
            overrideContext = (0, _repeatUtilities.createFullOverrideContext)(repeat, map.get(key), map.size - 1, map.size, key);
            repeat.insertView(map.size - 1, overrideContext.bindingContext, overrideContext);
            break;
          case 'delete':
            if (record.oldValue === undefined) {
              return;
            }
            removeIndex = this._getViewIndexByKey(repeat, key);
            viewOrPromise = repeat.removeView(removeIndex, true, !repeat.viewsRequireLifecycle);
            if (viewOrPromise instanceof Promise) {
              rmPromises.push(viewOrPromise);
            }
            break;
          case 'clear':
            repeat.removeAllViews(true, !repeat.viewsRequireLifecycle);
            break;
          default:
            continue;
        }
      }

      if (rmPromises.length > 0) {
        Promise.all(rmPromises).then(function () {
          (0, _repeatUtilities.updateOverrideContexts)(repeat.views(), 0);
        });
      } else {
        (0, _repeatUtilities.updateOverrideContexts)(repeat.views(), 0);
      }
    };

    MapRepeatStrategy.prototype._getViewIndexByKey = function _getViewIndexByKey(repeat, key) {
      var i = void 0;
      var ii = void 0;
      var child = void 0;

      for (i = 0, ii = repeat.viewCount(); i < ii; ++i) {
        child = repeat.view(i);
        if (child.bindingContext[repeat.key] === key) {
          return i;
        }
      }

      return undefined;
    };

    return MapRepeatStrategy;
  }();
});