WIP Next Region

src/application.js

@@ -3,7 +3,7 @@
 
 import _ from 'underscore';
 import extend from './utils/extend';
-import buildRegion from './common/build-region';
+import normalizeRegion from './common/normalize-region';
 import CommonMixin from './mixins/common';
 import DestroyMixin from './mixins/destroy';
 import RadioMixin from './mixins/radio';
@@ -50,11 +50,25 @@ _.extend(Application.prototype, CommonMixin, DestroyMixin, RadioMixin, {
 
     if (!region) { return; }
 
-    const defaults = {
-      regionClass: this.regionClass
-    };
+    this._region = this._buildRegion(region);
+  },
+
+  _buildRegion(definition) {
+    if (definition instanceof Region) {
+      return definition;
+    }
+
+    if (_.isFunction(definition)) {
+      return this._buildRegion(definition.call(this));
+    }
+
+    const options = normalizeRegion(definition, this.regionClass);
+
+    const RegionClass = options.regionClass;
+
+    delete options.regionClass;
 
-    this._region = buildRegion(region, defaults);
+    return new RegionClass(options);
   },
 
   getRegion() {

src/collection-view.js

@@ -74,7 +74,7 @@ const CollectionView = Backbone.View.extend({
     const $emptyEl = this.$container || this.$el;
 
     if (this._emptyRegion && !this._emptyRegion.isDestroyed()) {
-      this._emptyRegion._setElement($emptyEl[0]);
+      this._emptyRegion.setElement($emptyEl[0]);
       return this._emptyRegion;
     }
 

src/common/normalize-region.js

@@ -0,0 +1,19 @@
+import _ from 'underscore';
+import MarionetteError from '../utils/error';
+
+// return the region instance from the definition
+export default function(definition, regionClass) {
+  if (_.isString(definition)) {
+    definition = { el: definition };
+  }
+
+  if (!_.isString(definition.el)) {
+    console.log(definition);
+    throw new MarionetteError({
+      message: 'Improper region configuration type.',
+      url: 'marionette.region.html#defining-regions'
+    });
+  }
+
+  return _.extend({ regionClass }, definition);
+}

src/mixins/regions.js

@@ -1,105 +1,96 @@
 import _ from 'underscore';
 import _invoke from '../utils/invoke';
-import buildRegion from '../common/build-region';
+import normalizeRegion from '../common/normalize-region';
 import Region from '../region';
 
+// Performant startsWith
+function startsWithUi(el) {
+  return el[0] === '@' &&
+         el[1] === 'u' &&
+         el[2] === 'i' &&
+         el[3] === '.';
+}
+
 // MixinOptions
 // - regions
 // - regionClass
 
 export default {
   regionClass: Region,
 
-  // Internal method to initialize the regions that have been defined in a
-  // `regions` attribute on this View.
+  // Internal method to initialize the regions attributes
   _initRegions() {
 
-    // init regions hash
-    this.regions = this.regions || {};
+    // init regions instance hash
     this._regions = {};
-
-    this.addRegions(_.result(this, 'regions'));
+    // init regions definition hash
+    this.regions = _.extend({}, _.result(this, 'regions'));
   },
 
-  // Internal method to re-initialize all of the regions by updating
-  // the `el` that they point to
-  _reInitRegions() {
-    _invoke(this._regions, 'reset');
-  },
+  // Adds or rebinds all regions associated with the view
+  _bindRegions() {
+    const regions = this.addRegions(_.extend({}, this.regions));
 
-  // Add a single region, by name, to the View
-  addRegion(name, definition) {
-    const regions = {};
-    regions[name] = definition;
-    return this.addRegions(regions)[name];
+    this.triggerMethod('bind:regions', this, regions);
   },
 
-  // Add multiple regions as a {name: definition, name2: def2} object literal
-  addRegions(regions) {
-    // If there's nothing to add, stop here.
-    if (_.isEmpty(regions)) {
-      return;
+  // Finds an existing ui with `@ui.` or finds the `el` on the DOM
+  _findEl(el) {
+    if (_.isString(el) && startsWithUi(el)) {
+      return this.ui[el.slice(4)];
     }
 
-    // Normalize region selectors hash to allow
-    // a user to use the @ui. syntax.
-    regions = this.normalizeUIValues(regions, 'el');
-
-    // Add the regions definitions to the regions property
-    this.regions = _.extend({}, this.regions, regions);
-
-    return this._addRegions(regions);
-  },
-
-  // internal method to build and add regions
-  _addRegions(regionDefinitions) {
-    const defaults = {
-      regionClass: this.regionClass,
-      parentEl: _.partial(_.result, this, 'el')
-    };
-
-    return _.reduce(regionDefinitions, (regions, definition, name) => {
-      regions[name] = buildRegion(definition, defaults);
-      this._addRegion(regions[name], name);
-      return regions;
-    }, {});
+    return this.Dom.findEl(this.el, el);
   },
 
-  _addRegion(region, name) {
-    this.triggerMethod('before:add:region', this, name, region);
+  _buildRegion(name, RegionClass, options) {
+    const region = new RegionClass(options);
 
     region._parentView = this;
     region._name = name;
 
     this._regions[name] = region;
 
-    this.triggerMethod('add:region', this, name, region);
+    return region;
   },
 
-  // Remove a single region from the View, by name
-  removeRegion(name) {
-    const region = this._regions[name];
+  // Add a single region, by name, to the View
+  addRegion(name, definition) {
+    const currentRegion = this.getRegion(name);
+    definition = normalizeRegion(definition, this.regionClass);
 
-    this._removeRegion(region, name);
+    this.regions[name] = definition;
 
-    return region;
-  },
+    const options = _.extend({}, definition);
+    options.el = this._findEl(options.el);
 
-  // Remove all regions from the View
-  removeRegions() {
-    const regions = this._getRegions();
+    if (currentRegion) {
+      return currentRegion.setElement(options.el);
+    }
 
-    _.each(this._regions, this._removeRegion.bind(this));
+    const RegionClass = options.regionClass;
+    delete options.regionClass;
 
-    return regions;
+    return this._buildRegion(name, RegionClass, options);
   },
 
-  _removeRegion(region, name) {
-    this.triggerMethod('before:remove:region', this, name, region);
+  // Add multiple region definitions
+  addRegions(regionDefinitions) {
+    return _.map(regionDefinitions, (definition, name) => {
+      return this.addRegion(name, definition);
+    });
+  },
 
-    region.destroy();
+  // Remove a single region from the View, by name
+  removeRegion(name) {
+    return this.getRegion(name).destroy();
+  },
 
-    this.triggerMethod('remove:region', this, name, region);
+  // Remove all regions from the View
+  removeRegions() {
+    const regions = this._getRegions();
+    _invoke(regions, 'destroy');
+    return regions;
   },
 
   // Called in a region's destroy
@@ -134,7 +125,7 @@ export default {
   },
 
   _getRegions() {
-    return _.clone(this._regions);
+    return _.extend({}, this._regions);
   },
 
   // Get all regions
@@ -158,5 +149,4 @@ export default {
   getChildView(name) {
     return this.getRegion(name).currentView;
   }
-
 };

src/mixins/ui.js

@@ -1,15 +1,4 @@
 import _ from 'underscore';
-// allows for the use of the @ui. syntax within
-// a given key for triggers and events
-// swaps the @ui with the associated selector.
-// Returns a new, non-mutated, parsed events hash.
-const normalizeUIKeys = function(hash, ui) {
-  return _.reduce(hash, (memo, val, key) => {
-    const normalizedKey = normalizeUIString(key, ui);
-    memo[normalizedKey] = val;
-    return memo;
-  }, {});
-};
 
 const uiRegEx = /@ui\.[a-zA-Z-_$0-9]*/g;
 
@@ -21,30 +10,19 @@ const normalizeUIString = function(uiString, ui) {
   });
 };
 
-// allows for the use of the @ui. syntax within
-// a given value for regions
-// swaps the @ui with the associated selector
-const normalizeUIValues = function(hash, ui, property) {
-  _.each(hash, (val, key) => {
-    if (_.isString(val)) {
-      hash[key] = normalizeUIString(val, ui);
-    } else if (val) {
-      const propertyVal = val[property];
-      if (_.isString(propertyVal)) {
-        val[property] = normalizeUIString(propertyVal, ui);
-      }
-    }
-  });
-  return hash;
-};
-
 export default {
 
-  // normalize the keys of passed hash with the views `ui` selectors.
-  // `{"@ui.foo": "bar"}`
+  // allows for the use of the @ui. syntax within
+  // a given key for triggers and events
+  // swaps the @ui with the associated selector.
+  // Returns a new, non-mutated, parsed events hash.
   normalizeUIKeys(hash) {
     const uiBindings = this._getUIBindings();
-    return normalizeUIKeys(hash, uiBindings);
+    return _.reduce(hash, (memo, val, key) => {
+      const normalizedKey = normalizeUIString(key, uiBindings);
+      memo[normalizedKey] = val;
+      return memo;
+    }, {});
   },
 
   // normalize the passed string with the views `ui` selectors.
@@ -54,13 +32,6 @@ export default {
     return normalizeUIString(uiString, uiBindings);
   },
 
-  // normalize the values of passed hash with the views `ui` selectors.
-  // `{foo: "@ui.bar"}`
-  normalizeUIValues(hash, property) {
-    const uiBindings = this._getUIBindings();
-    return normalizeUIValues(hash, uiBindings, property);
-  },
-
   _getUIBindings() {
     const uiBindings = _.result(this, '_uiBindings');
     return uiBindings || _.result(this, 'ui');