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// Copyright (c) 2012 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.
'use strict';
/**
* @fileoverview This implements a common button control, bound to command.
*/
/**
* Creates a new button element.
* @param {Object=} opt_propertyBag Optional properties.
* @constructor
* @extends {HTMLDivElement}
*/
var CommandButton = cr.ui.define('button');
/** @override */
CommandButton.prototype.__proto__ = HTMLButtonElement.prototype;
/**
* Associated command.
* @type {Command}
* @private
*/
CommandButton.prototype.command_ = null;
/**
* Initializes the menu item.
*/
CommandButton.prototype.decorate = function() {
var commandId;
if ((commandId = this.getAttribute('command')))
this.setCommand(commandId);
this.addEventListener('click', this.handleClick_.bind(this));
this.addEventListener('keypress', this.handleKeyPress_.bind(this));
};
/**
* Returns associated command.
* @return {cr.ui.Command} associated command.
*/
CommandButton.prototype.getCommand = function() {
return this.command_;
};
/**
* Associates command with this button.
* @param {string|cr.ui.Command} command Command id, or command object to
* associate with this button.
*/
CommandButton.prototype.setCommand = function(command) {
if (this.command_) {
this.command_.removeEventListener('labelChange', this);
this.command_.removeEventListener('disabledChange', this);
this.command_.removeEventListener('hiddenChange', this);
}
if (typeof command == 'string' && command[0] == '#') {
command = this.ownerDocument.getElementById(command.slice(1));
cr.ui.decorate(command, cr.ui.Command);
}
this.command_ = command;
if (command) {
if (command.id)
this.setAttribute('command', '#' + command.id);
this.setLabel(command.label);
this.disabled = command.disabled;
this.hidden = command.hidden;
this.command_.addEventListener('labelChange', this);
this.command_.addEventListener('disabledChange', this);
this.command_.addEventListener('hiddenChange', this);
}
};
/**
* Returns button label
* @return {string} Button label.
*/
CommandButton.prototype.getLabel = function() {
return this.textContent;
};
/**
* Sets button label.
* @param {string} label New button label.
*/
CommandButton.prototype.setLabel = function(label) {
this.textContent = label;
};
/**
* Handles click event and dispatches associated command.
* @param {Event} e The mouseup event object.
* @private
*/
CommandButton.prototype.handleClick_ = function(e) {
if (!this.disabled && this.command_)
this.command_.execute(this);
};
/**
* Handles keypress event and dispatches associated command.
* @param {Event} e The mouseup event object.
* @private
*/
CommandButton.prototype.handleKeyPress_ = function(e) {
if (!this.command_) return;
switch (util.getKeyModifiers(e) + e.keyCode) {
case '13': // Enter
case '32': // Space
this.command_.execute(this);
break;
}
};
/**
* Handles changes to the associated command.
* @param {Event} e The event object.
*/
CommandButton.prototype.handleEvent = function(e) {
switch (e.type) {
case 'disabledChange':
this.disabled = this.command_.disabled;
break;
case 'hiddenChange':
this.hidden = this.command_.hidden;
break;
case 'labelChange':
this.setLabel(this.command_.label);
break;
}
};
/**
* Whether the button is disabled or not.
* @type {boolean}
*/
cr.defineProperty(CommandButton, 'disabled',
cr.PropertyKind.BOOL_ATTR);
/**
* Whether the button is hidden or not.
* @type {boolean}
*/
cr.defineProperty(CommandButton, 'hidden',
cr.PropertyKind.BOOL_ATTR);
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