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// Copyright (c) 2011 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.
cr.define('options', function() {
const ArrayDataModel = cr.ui.ArrayDataModel;
const List = cr.ui.List;
const ListItem = cr.ui.ListItem;
/**
* Creates a new autocomplete list item.
* @param {Object} pageInfo The page this item represents.
* @constructor
* @extends {cr.ui.ListItem}
*/
function AutocompleteListItem(pageInfo) {
var el = cr.doc.createElement('div');
el.pageInfo_ = pageInfo;
AutocompleteListItem.decorate(el);
return el;
}
/**
* Decorates an element as an autocomplete list item.
* @param {!HTMLElement} el The element to decorate.
*/
AutocompleteListItem.decorate = function(el) {
el.__proto__ = AutocompleteListItem.prototype;
el.decorate();
};
AutocompleteListItem.prototype = {
__proto__: ListItem.prototype,
/** @inheritDoc */
decorate: function() {
ListItem.prototype.decorate.call(this);
var title = this.pageInfo_['title'];
var url = this.pageInfo_['displayURL'];
var titleEl = this.ownerDocument.createElement('span');
titleEl.className = 'title';
titleEl.textContent = title || url;
this.appendChild(titleEl);
if (title && title.length > 0 && url != title) {
var separatorEl = this.ownerDocument.createTextNode(' - ');
this.appendChild(separatorEl);
var urlEl = this.ownerDocument.createElement('span');
urlEl.className = 'url';
urlEl.textContent = url;
this.appendChild(urlEl);
}
},
};
/**
* Creates a new autocomplete list popup.
* @constructor
* @extends {cr.ui.List}
*/
var AutocompleteList = cr.ui.define('list');
AutocompleteList.prototype = {
__proto__: List.prototype,
/**
* The text field the autocomplete popup is currently attached to, if any.
* @type {HTMLElement}
* @private
*/
targetInput_: null,
/**
* Keydown event listener to attach to a text field.
* @type {Function}
* @private
*/
textFieldKeyHandler_: null,
/**
* Input event listener to attach to a text field.
* @type {Function}
* @private
*/
textFieldInputHandler_: null,
/**
* A function to call when new suggestions are needed.
* @type {Function}
* @private
*/
suggestionUpdateRequestCallback_: null,
/** @inheritDoc */
decorate: function() {
List.prototype.decorate.call(this);
this.classList.add('autocomplete-suggestions');
this.selectionModel = new cr.ui.ListSingleSelectionModel;
this.textFieldKeyHandler_ = this.handleAutocompleteKeydown_.bind(this);
var self = this;
this.textFieldInputHandler_ = function(e) {
if (self.suggestionUpdateRequestCallback_)
self.suggestionUpdateRequestCallback_(self.targetInput_.value);
};
this.addEventListener('change', function(e) {
var input = self.targetInput;
if (!input || !self.selectedItem)
return;
input.value = self.selectedItem['url'];
// Programatically change the value won't trigger a change event, but
// clients are likely to want to know when changes happen, so fire one.
var changeEvent = document.createEvent('Event');
changeEvent.initEvent('change', true, true);
input.dispatchEvent(changeEvent);
});
// Start hidden; adding suggestions will unhide.
this.hidden = true;
},
/** @inheritDoc */
createItem: function(pageInfo) {
return new AutocompleteListItem(pageInfo);
},
/**
* The suggestions to show.
* @type {Array}
*/
set suggestions(suggestions) {
this.dataModel = new ArrayDataModel(suggestions);
this.hidden = !this.targetInput_ || suggestions.length == 0;
},
/**
* A function to call when the attached input field's contents change.
* The function should take one string argument, which will be the text
* to autocomplete from.
* @type {Function}
*/
set suggestionUpdateRequestCallback(callback) {
this.suggestionUpdateRequestCallback_ = callback;
},
/**
* Attaches the popup to the given input element. Requires
* that the input be wrapped in a block-level container of the same width.
* @param {HTMLElement} input The input element to attach to.
*/
attachToInput: function(input) {
if (this.targetInput_ == input)
return;
this.detach();
this.targetInput_ = input;
this.style.width = input.getBoundingClientRect().width + 'px';
this.hidden = false; // Necessary for positionPopupAroundElement to work.
cr.ui.positionPopupAroundElement(input, this, cr.ui.AnchorType.BELOW)
// Start hidden; when the data model gets results the list will show.
this.hidden = true;
input.addEventListener('keydown', this.textFieldKeyHandler_, true);
input.addEventListener('input', this.textFieldInputHandler_);
},
/**
* Detaches the autocomplete popup from its current input element, if any.
*/
detach: function() {
var input = this.targetInput_
if (!input)
return;
input.removeEventListener('keydown', this.textFieldKeyHandler_);
input.removeEventListener('input', this.textFieldInputHandler_);
this.targetInput_ = null;
this.suggestions = [];
},
/**
* Makes sure that the suggestion list matches the width of the input it is.
* attached to. Should be called any time the input is resized.
*/
syncWidthToInput: function() {
var input = this.targetInput_
if (input)
this.style.width = input.getBoundingClientRect().width + 'px';
},
/**
* The text field the autocomplete popup is currently attached to, if any.
* @return {HTMLElement}
*/
get targetInput() {
return this.targetInput_;
},
/**
* Handles input field key events that should be interpreted as autocomplete
* commands.
* @param {Event} event The keydown event.
* @private
*/
handleAutocompleteKeydown_: function(event) {
if (this.hidden)
return;
var handled = false;
switch (event.keyIdentifier) {
case 'U+001B': // Esc
this.suggestions = [];
handled = true;
break;
case 'Enter':
var hadSelection = this.selectedItem != null;
this.suggestions = [];
// Only count the event as handled if a selection is being commited.
handled = hadSelection;
break;
case 'Up':
case 'Down':
this.dispatchEvent(event);
handled = true;
break;
}
// Don't let arrow keys affect the text field, or bubble up to, e.g.,
// an enclosing list item.
if (handled) {
event.preventDefault();
event.stopPropagation();
}
},
};
return {
AutocompleteList: AutocompleteList
};
});
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