From 4ef22bddf05ca24005dcfb97a0e96d4d61854bb2 Mon Sep 17 00:00:00 2001
From: Artur Arseniev <artur.catch@hotmail.it>
Date: Thu, 28 Dec 2017 00:12:11 +0100
Subject: [PATCH] Refactor TraitView and sync it with target changes. Closes
 #686

---
 src/trait_manager/model/Trait.js    | 45 ++++++++++++++++++++++++++---
 src/trait_manager/view/TraitView.js | 44 +++++++++++++++++-----------
 2 files changed, 68 insertions(+), 21 deletions(-)

diff --git a/src/trait_manager/model/Trait.js b/src/trait_manager/model/Trait.js
index 0f55687c7..adec39da0 100644
--- a/src/trait_manager/model/Trait.js
+++ b/src/trait_manager/model/Trait.js
@@ -1,6 +1,6 @@
-var Backbone = require('backbone');
+import { isUndefined } from 'underscore';
 
-module.exports = Backbone.Model.extend({
+module.exports = require('backbone').Model.extend({
 
   defaults: {
     type: 'text', // text, number, range, select
@@ -16,13 +16,50 @@ module.exports = Backbone.Model.extend({
     options: [],
   },
 
+
   initialize() {
-    if (this.get('target')) {
-      this.target = this.get('target');
+    const target = this.get('target');
+    const name = this.get('name');
+    const changeProp = this.get('changeProp');
+
+    if (target) {
+      this.target = target;
       this.unset('target');
+      const targetEvent = changeProp ? `change:${name}` : `change:attributes:${name}`;
+      this.listenTo(target, targetEvent, this.targetUpdated);
+    }
+  },
+
+
+  targetUpdated() {
+    const value = this.getTargetValue();
+    !isUndefined(value) && this.set({ value }, { fromTarget: 1 });
+  },
+
+
+  getTargetValue() {
+    const name = this.get('name');
+    const target = this.target;
+    const prop = this.get('changeProp');
+    if (target) return prop ? target.get(name) : target.getAttributes()[name];
+  },
+
+
+  setTargetValue(value) {
+    const target = this.target;
+    const name = this.get('name');
+    if (isUndefined(value)) return;
+
+    if (this.get('changeProp')) {
+      target.set(name, value);
+    } else {
+      const attrs = { ...target.get('attributes') };
+      attrs[name] = value;
+      target.set('attributes', attrs);
     }
   },
 
+
   /**
    * Get the initial value of the trait
    * @return {string}
diff --git a/src/trait_manager/view/TraitView.js b/src/trait_manager/view/TraitView.js
index 607ace50b..c5e843cce 100644
--- a/src/trait_manager/view/TraitView.js
+++ b/src/trait_manager/view/TraitView.js
@@ -1,3 +1,6 @@
+import { isUndefined, clone } from 'underscore';
+
+const Backbone = require('backbone');
 const $ = Backbone.$;
 
 module.exports = Backbone.View.extend({
@@ -11,20 +14,23 @@ module.exports = Backbone.View.extend({
   },
 
   initialize(o) {
-    var md = this.model;
+    const model = this.model;
+    const name = model.get('name');
+    const target = model.target;
     this.config = o.config || {};
     this.pfx = this.config.stylePrefix || '';
     this.ppfx = this.config.pStylePrefix || '';
-    this.target = md.target;
+    this.target = target;
     this.className = this.pfx + 'trait';
     this.labelClass = this.ppfx + 'label';
-    this.fieldClass = this.ppfx + 'field ' + this.ppfx + 'field-' + md.get('type');
+    this.fieldClass = this.ppfx + 'field ' + this.ppfx + 'field-' + model.get('type');
     this.inputhClass = this.ppfx + 'input-holder';
-    md.off('change:value', this.onValueChange);
-    this.listenTo(md, 'change:value', this.onValueChange);
+    model.off('change:value', this.onValueChange);
+    this.listenTo(model, 'change:value', this.onValueChange);
     this.tmpl = '<div class="' + this.fieldClass +'"><div class="' + this.inputhClass +'"></div></div>';
   },
 
+
   /**
    * Fires when the input is changed
    * @private
@@ -37,22 +43,26 @@ module.exports = Backbone.View.extend({
     return this.model.get('value');
   },
 
+
+  setInputValue(value) {
+    this.getInputEl().value = value;
+  },
+
+
   /**
    * On change callback
    * @private
    */
-  onValueChange() {
-    var m = this.model;
-    var trg = this.target;
-    var name = m.get('name');
-    var value = this.getValueForTarget();
-    // Chabge property if requested otherwise attributes
-    if(m.get('changeProp')){
-      trg.set(name, value);
-    }else{
-      var attrs = _.clone(trg.get('attributes'));
-      attrs[name] = value;
-      trg.set('attributes', attrs);
+  onValueChange(model, value, opts = {}) {
+    const mod = this.model;
+    const trg = this.target;
+    const name = mod.get('name');
+
+    if (opts.fromTarget) {
+      this.setInputValue(mod.get('value'));
+    } else {
+      const value = this.getValueForTarget();
+      mod.setTargetValue(value);
     }
   },