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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.
/**
* @fileoverview This implements a special button that is useful for showing a
* context menu.
*/
cr.define('cr.ui', function() {
/** @const */ var MenuButton = cr.ui.MenuButton;
/**
* Helper function for ContextMenuButton to find the first ancestor of the
* button that has a context menu.
* @param {!MenuButton} el The button to start the search from.
* @return {HTMLElement} The found element or null if not found.
*/
function getContextMenuTarget(el) {
do {
el = el.parentNode;
} while (el && !('contextMenu' in el));
return el;
}
/**
* Creates a new menu button which is used to show the context menu for an
* ancestor that has a {@code contextMenu} property.
* @param {Object=} opt_propertyBag Optional properties.
* @constructor
* @extends {MenuButton}
*/
var ContextMenuButton = cr.ui.define('button');
ContextMenuButton.prototype = {
__proto__: MenuButton.prototype,
/**
* Override to return the contextMenu for the ancestor.
* @override
* @type {cr.ui.Menu}
*/
get menu() {
var target = getContextMenuTarget(this);
return target && target.contextMenu;
},
/** @override */
decorate: function() {
this.tabIndex = -1;
this.addEventListener('mouseup', this);
MenuButton.prototype.decorate.call(this);
},
/** @override */
handleEvent: function(e) {
switch (e.type) {
case 'mousedown':
// Menu buttons prevent focus changes.
var target = getContextMenuTarget(this);
if (target)
target.focus();
break;
case 'mouseup':
// Stop mouseup to prevent selection changes.
e.stopPropagation();
break;
}
MenuButton.prototype.handleEvent.call(this, e);
},
/**
* Override MenuButton showMenu to allow the mousedown to be fully handled
* before the menu is shown. This is important in case the mousedown
* triggers command changes.
* @param {boolean} shouldSetFocus Whether the menu should be focused after
* the menu is shown.
*/
showMenu: function(shouldSetFocus) {
var self = this;
window.setTimeout(function() {
MenuButton.prototype.showMenu.call(self, shouldSetFocus);
});
}
};
// Export
return {
ContextMenuButton: ContextMenuButton
};
});
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