From cc10fa94304ac8bc6a206049b03e7f010c0d0883 Mon Sep 17 00:00:00 2001
From: Jeremy Elbourn <jelbourn@google.com>
Date: Tue, 2 Jun 2015 14:30:03 -0700
Subject: [PATCH] feat(datepicker): binding for the date-picker

---
 src/components/calendar/datePicker.js         | 66 +++++++++++++++----
 src/components/calendar/dateUtil.js           | 12 +++-
 .../calendar/demoDatePicker/style.css         |  3 +
 3 files changed, 69 insertions(+), 12 deletions(-)

diff --git a/src/components/calendar/datePicker.js b/src/components/calendar/datePicker.js
index 0e0b34f9446..184866389b8 100644
--- a/src/components/calendar/datePicker.js
+++ b/src/components/calendar/datePicker.js
@@ -1,35 +1,56 @@
 (function() {
   'use strict';
 
+  // TODO(jelbourn): md-calendar shown in floating panel.
+  // TODO(jelbourn): little calendar icon next to input
+  // TODO(jelbourn): only one open md-calendar panel at a time per application
+
+
   angular.module('material.components.calendar')
       .directive('mdDatePicker', datePickerDirective);
 
   function datePickerDirective() {
     return {
       template:
-        '<div>' +
-          '<input ng-model="textValue"> <br>' +
-          '<md-calendar ng-model="dateValue"></md-calendar>' +
+        '<div class="md-date-picker">' +
+          '<input> <br>' +
+          '<md-calendar ng-model="ctrl.date"></md-calendar>' +
         '</div>',
       require: ['ngModel', 'mdDatePicker'],
       scope: {},
       controller: DatePickerCtrl,
-      controllerAs: 'ctrl'
+      controllerAs: 'ctrl',
+      link: function(scope, element, attr, controllers) {
+        var ngModelCtrl = controllers[0];
+        var mdDatePickerCtrl = controllers[1];
+        mdDatePickerCtrl.configureNgModel(ngModelCtrl);
+      }
     };
   }
 
-  function DatePickerCtrl($$mdDateLocale) {
+  function DatePickerCtrl($scope, $element, $$mdDateLocale, $$mdDateUtil) {
     /** @final */
     this.dateLocale = $$mdDateLocale;
 
+    /** @final */
+    this.dateUtil = $$mdDateUtil;
+
     /** @type {!angular.NgModelController} */
     this.ngModelCtrl = null;
 
-    /** @type {string} */
-    this.textValue = '';
+    /** @type {HTMLInputElement} */
+    this.inputElement = $element[0].querySelector('input');
 
     /** @type {Date} */
-    this.dateValue = null;
+    this.date = null;
+
+    /** @final {!angular.JQLite} */
+    this.$element = $element;
+
+    /** @final {!angular.Scope} */
+    this.$scope = $scope;
+
+    this.attachChangeListeners();
   }
 
   /**
@@ -41,8 +62,31 @@
 
     var self = this;
     ngModelCtrl.$render = function() {
-      self.dateValue = self.ngModelCtrl.$viewValue
-      self.textValue = self.dateLocale.format(self.ngModelCtrl.$viewValue);
+      self.date = self.ngModelCtrl.$viewValue;
+      self.inputElement.value = self.dateLocale.formatDate(self.date);
     };
-  }
+  };
+
+  /**
+   * Attach event listeners for both the text input and the md-calendar.
+   * Events are used instead of ng-model so that updates don't infinitely update the other
+   * on a change. This should also be more performant than using a $watch.
+   */
+  DatePickerCtrl.prototype.attachChangeListeners = function() {
+    var self = this;
+
+    self.$scope.$on('md-calendar-change', function(event, date) {
+      self.ngModelCtrl.$setViewValue(date);
+      self.inputElement.value = self.dateLocale.formatDate(date);
+    });
+
+    // TODO(jelbourn): debounce
+    self.inputElement.addEventListener('input', function() {
+      var parsedDate = self.dateLocale.parseDate(self.inputElement.value);
+      if (self.dateUtil.isValidDate(parsedDate)) {
+        self.date = parsedDate;
+        self.$scope.$apply();
+      }
+    });
+  };
 })();
diff --git a/src/components/calendar/dateUtil.js b/src/components/calendar/dateUtil.js
index a161bd772fd..53a2c6ac978 100644
--- a/src/components/calendar/dateUtil.js
+++ b/src/components/calendar/dateUtil.js
@@ -19,7 +19,8 @@
       incrementDays: incrementDays,
       incrementMonths: incrementMonths,
       getLastDateOfMonth: getLastDateOfMonth,
-      isSameDay: isSameDay
+      isSameDay: isSameDay,
+      isValidDate: isValidDate
     };
 
     /**
@@ -162,5 +163,14 @@
     function getLastDateOfMonth(date) {
       return new Date(date.getFullYear(), date.getMonth(), getNumberOfDaysInMonth(date));
     }
+
+    /**
+     * Checks whether a date is valid.
+     * @param {Date} date
+     * @return {boolean} Whether the date is a valid Date.
+     */
+    function isValidDate(date) {
+      return date != null && date.getTime && !isNaN(date.getTime());
+    }
   });
 })();
diff --git a/src/components/calendar/demoDatePicker/style.css b/src/components/calendar/demoDatePicker/style.css
index 1156334a7f7..8a4690861dd 100644
--- a/src/components/calendar/demoDatePicker/style.css
+++ b/src/components/calendar/demoDatePicker/style.css
@@ -1 +1,4 @@
 /** Demo styles for mdCalendar. */
+.md-date-picker {
+  border: 2px solid darkred;
+}