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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 List = cr.ui.List;
const ListItem = cr.ui.ListItem;
/**
* Creates a deletable list item, which has a button that will trigger a call
* to deleteItemAtIndex(index) in the list.
*/
var DeletableItem = cr.ui.define('li');
DeletableItem.prototype = {
__proto__: ListItem.prototype,
/**
* The element subclasses should populate with content.
* @type {HTMLElement}
* @private
*/
contentElement_: null,
/**
* The close button element.
* @type {HTMLElement}
* @private
*/
closeButtonElement_: null,
/**
* Whether or not this item can be deleted.
* @type {boolean}
* @private
*/
deletable_: true,
/** @inheritDoc */
decorate: function() {
ListItem.prototype.decorate.call(this);
this.classList.add('deletable-item');
this.contentElement_ = this.ownerDocument.createElement('div');
this.appendChild(this.contentElement_);
this.closeButtonElement_ = this.ownerDocument.createElement('button');
this.closeButtonElement_.className =
'raw-button close-button custom-appearance';
this.closeButtonElement_.addEventListener('mousedown',
this.handleMouseDownUpOnClose_);
this.closeButtonElement_.addEventListener('mouseup',
this.handleMouseDownUpOnClose_);
this.closeButtonElement_.addEventListener('focus',
this.handleFocus_.bind(this));
this.appendChild(this.closeButtonElement_);
},
/**
* Returns the element subclasses should add content to.
* @return {HTMLElement} The element subclasses should popuplate.
*/
get contentElement() {
return this.contentElement_;
},
/* Gets/sets the deletable property. An item that is not deletable doesn't
* show the delete button (although space is still reserved for it).
*/
get deletable() {
return this.deletable_;
},
set deletable(value) {
this.deletable_ = value;
this.closeButtonElement_.disabled = !value;
},
/**
* Called when a focusable child element receives focus. Selects this item
* in the list selection model.
* @private
*/
handleFocus_: function() {
var list = this.parentNode;
var index = list.getIndexOfListItem(this);
list.selectionModel.selectedIndex = index;
list.selectionModel.anchorIndex = index;
},
/**
* Don't let the list have a crack at the event. We don't want clicking the
* close button to change the selection of the list.
* @param {Event} e The mouse down/up event object.
* @private
*/
handleMouseDownUpOnClose_: function(e) {
if (!e.target.disabled)
e.stopPropagation();
},
};
var DeletableItemList = cr.ui.define('list');
DeletableItemList.prototype = {
__proto__: List.prototype,
/** @inheritDoc */
decorate: function() {
List.prototype.decorate.call(this);
this.addEventListener('click', this.handleClick_);
this.addEventListener('keydown', this.handleKeyDown_);
},
/**
* Callback for onclick events.
* @param {Event} e The click event object.
* @private
*/
handleClick_: function(e) {
if (this.disabled)
return;
var target = e.target;
if (target.classList.contains('close-button')) {
var listItem = this.getListItemAncestor(target);
var selected = this.selectionModel.selectedIndexes;
// Check if the list item that contains the close button being clicked
// is not in the list of selected items. Only delete this item in that
// case.
var idx = this.getIndexOfListItem(listItem);
if (selected.indexOf(idx) == -1) {
this.deleteItemAtIndex(idx);
} else {
this.deleteSelectedItems_();
}
}
},
/**
* Callback for keydown events.
* @param {Event} e The keydown event object.
* @private
*/
handleKeyDown_: function(e) {
// Map delete (and backspace on Mac) to item deletion (unless focus is
// in an input field, where it's intended for text editing).
if ((e.keyCode == 46 || (e.keyCode == 8 && cr.isMac)) &&
e.target.tagName != 'INPUT') {
this.deleteSelectedItems_();
// Prevent the browser from going back.
e.preventDefault();
}
},
/**
* Deletes all the currently selected items that are deletable.
* @private
*/
deleteSelectedItems_: function() {
var selected = this.selectionModel.selectedIndexes;
// Reverse through the list of selected indexes to maintain the
// correct index values after deletion.
for (var j = selected.length - 1; j >= 0; j--) {
var index = selected[j];
if (this.getListItemByIndex(index).deletable)
this.deleteItemAtIndex(index);
}
},
/**
* Called when an item should be deleted; subclasses are responsible for
* implementing.
* @param {number} index The index of the item that is being deleted.
*/
deleteItemAtIndex: function(index) {
},
};
return {
DeletableItemList: DeletableItemList,
DeletableItem: DeletableItem,
};
});
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