MD Downloads: make Ctrl+f invoke in-page search

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
@@ skipping 11 matching lines @@
     },
 
     clearLabel: {
       type: String,
       value: '',
     },
 
     showingSearch_: {
       type: Boolean,
       value: false,
+      observer: 'showingSearchChanged_',
     },
   },
 
+  /**
+   * Returns the value of the search field.
+   * @return {string}
+   */
+  getValue: function() {
+    var searchInput = this.getSearchInput_();
+    return searchInput ? searchInput.value : '';
+  },
+
   /** @param {SearchFieldDelegate} delegate */
   setDelegate: function(delegate) {
     this.delegate_ = delegate;
   },
 
-  /**
-   * Returns the value of the search field.
-   * @return {string}
-   */
-  getValue: function() {
-    var searchInput = this.$$('#search-input');
-    return searchInput ? searchInput.value : '';
+  showAndFocus: function() {
+    this.showingSearch_ = true;
+    this.focus_();
   },
 
   /** @private */
+  focus_: function() {
+    this.async(function() {
+      if (!this.showingSearch_)
+        return;
+
+      var searchInput = this.getSearchInput_();
+      if (searchInput)
+        searchInput.focus();
+    });
+  },
+
+  /**
+   * @return {?HTMLElement}
+   * @private
+   */
+  getSearchInput_: function() {
+    return this.$$('#search-input');
+  },
+
+  /** @private */
   onSearchTermSearch_: function() {
     if (this.delegate_)
       this.delegate_.onSearchTermSearch(this.getValue());
   },
 
   /** @private */
   onSearchTermKeydown_: function(e) {
-    assert(this.showingSearch_);
     if (e.keyIdentifier == 'U+001B')  // Escape.
-      this.toggleShowingSearch_();
+      this.showingSearch_ = false;
+  },
+
+  /** @private */
+  showingSearchChanged_: function() {
+    if (this.showingSearch_) {
+      this.focus_();
+      return;
+    }
+
+    var searchInput = this.getSearchInput_();
+    if (!searchInput)
+      return;
+
+    searchInput.value = '';
+    this.onSearchTermSearch_();
   },
 
   /** @private */
   toggleShowingSearch_: function() {

[michaelpg, 2016/01/21 23:43:35]

unused now?

[Dan Beam, 2016/01/21 23:54:23]

nope, in html

     this.showingSearch_ = !this.showingSearch_;
-    this.async(function() {
-      var searchInput = this.$$('#search-input');
-      if (this.showingSearch_) {
-        searchInput.focus();
-      } else {
-        searchInput.value = '';
-        this.onSearchTermSearch_();
-      }
-    });
   },
 });