[Do not commit] MD History: Experimentally implement cr-toolbar using cr-search-field

ui/webui/resources/cr_elements/cr_search_field/cr_search_field.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** @interface */
 var SearchFieldDelegate = function() {};
 
 SearchFieldDelegate.prototype = {
   /**
    * @param {string} value
    */
   onSearchTermSearch: assertNotReached,
 };
 
 var SearchField = Polymer({
   is: 'cr-search-field',
-
   properties: {
     label: {
       type: String,
       value: '',
     },
 
     clearLabel: {
       type: String,
       value: '',
     },
 
-    showingSearch_: {
+    showingSearch: {
       type: Boolean,
       value: false,
+      notify: true,
       observer: 'showingSearchChanged_',
+      reflectToAttribute: true
     },
+
+    /** @private */
+    hasSearchText_: {
+      type: Boolean,
+    }
+  },
+
+  listeners: {
+    'tap': 'onTap_'
+  },
+
+  onTap_: function(e) {
+    if (e.target != this.$.clearSearch)
+      this.showAndFocus();
   },
 
   /**
-   * Returns the value of the search field.
-   * @return {string}
+   * @return {string} The value of the search field.
    */
   getValue: function() {
     var searchInput = this.getSearchInput_();
     return searchInput ? searchInput.value : '';
   },
 
   /**
    * Sets the value of the search field, if it exists.
    * @param {string} value
    */
   setValue: function(value) {
     var searchInput = this.getSearchInput_();
     if (searchInput)
       searchInput.value = value;
+    this.hasSearchText_ = this.getValue() != '';
   },
 
   /** @param {SearchFieldDelegate} delegate */
   setDelegate: function(delegate) {
     this.delegate_ = delegate;
   },
 
-  /** @return {Promise<boolean>} */
+  /** @return {!Promise<boolean>} */
   showAndFocus: function() {
-    this.showingSearch_ = true;
+    this.showingSearch = true;
     return this.focus_();
   },
 
   /**
-   * @return {Promise<boolean>}
+   * @return {!Promise<boolean>}
    * @private
    */
   focus_: function() {
     return new Promise(function(resolve) {
       this.async(function() {
-        if (this.showingSearch_) {
+        if (this.showingSearch) {
           var searchInput = this.getSearchInput_();
           if (searchInput)
             searchInput.focus();
         }
-        resolve(this.showingSearch_);
+        resolve(this.showingSearch);
       });
     }.bind(this));
   },
 
   /**
    * @return {?Element}
    * @private
    */
   getSearchInput_: function() {
-    return this.$$('#search-input');
+    return this.$.searchInput;
   },
 
   /** @private */
   onSearchTermSearch_: function() {
+    this.hasSearchText_ = this.getValue() != '';
     if (this.delegate_)
       this.delegate_.onSearchTermSearch(this.getValue());
   },
 
   /** @private */
   onSearchTermKeydown_: function(e) {
     if (e.keyIdentifier == 'U+001B')  // Escape.
-      this.showingSearch_ = false;
+      this.showingSearch = false;
   },
 
   /** @private */
   showingSearchChanged_: function() {
-    if (this.showingSearch_) {
+    if (this.showingSearch) {
       this.focus_();
       return;
     }
 
     var searchInput = this.getSearchInput_();
     if (!searchInput)
       return;
 
     searchInput.value = '';
     this.onSearchTermSearch_();
   },
 
   /** @private */
   toggleShowingSearch_: function() {
-    this.showingSearch_ = !this.showingSearch_;
-  },
+    this.showingSearch = !this.showingSearch;
+  }
 });