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/*
* Copyright (C) 2013 Adnane Belmadiaf <daker@ubuntu.com>
* License granted by Canonical Limited
*
* This file is part of ubuntu-html5-ui-toolkit.
*
* This package is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or
* (at your option) any later version.
* This package is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
/**
* The Pagestack manages all Pages in a stack data structure. Initially, the Pagestack contains no Pages. The <em>push()</em> method is normally executed on load to display the app starting page.
UI.pagestack.push("pageID")
The topmost Page on the Pagestack is always displayed.
The Pagestack is declared as a direct child of the <em>content</em> div.
#####Default application wide footer
The Pagestack contains a default <em>footer</em> (represented in JavaScript as a Toolbar), even if you do not declare one in HTML. The <em>footer</em> has a single Back button.
#####Customized application wide footer
This application-wide <em>footer</em> can be customized (for example, you can add Buttons) by declaring a <em>footer</em> as a direct child of the <em>pagestack</em> div (see example).
######Page specific footers
A <em>page</em> may declare a page-specific <em>footer</em> as a child element.
* @class Pagestack
* @namespace UbuntuUI
* @constructor
* @example
<div data-role="mainview">
<header data-role="header">
</header>
<div data-role="content">
<div data-role="pagestack">
<div data-role="page" id="main" data-title="Page 1">
</div>
<div data-role="page" id="page2" data-title="Page 2">
[...]
<footer data-role="footer" class="revealed" id="footerPage2">
[...]
</footer>
</div>
<footer data-role="footer" class="revealed" id="footerAppWide">
[...]
</footer>
</div> <!-- end of Pagestack div -->
</div>
</div>
JavaScript:
UI.pagestack.METHOD();
*/
var Pagestack = (function () {
function __safeCall(f, args, errorfunc) {
if (typeof (f) !== 'function')
return;
try {
f.apply(null, args);
} catch (e) {
if (errorfunc && typeof (errorfunc) === 'function') errorfunc(e)
}
};
function Pagestack(pagestack) {
this._pages = [];
this._pagestack = pagestack;
};
Pagestack.prototype = {
/**
* Push a page to the top of this pagestack
* @method push
* @param {String} id - The id attribute of the page element to be pushed
* @param {Object} properties - This param is not currently used
*/
push: function (id, properties) {
try {
__safeCall(this.__setAllPagesVisibility.bind(this), [false]);
(new Page(id)).activate(id);
this._pages.push(id);
this.__dispatchPageChanged(this.currentPage());
} catch (e) {}
},
/**
* Checks for zero pages in this pagestack
* @method isEmpty
* @return {Boolean} - True when this pagestack has no pages, else false
*/
isEmpty: function () {
return this._pages.length === 0;
},
/**
* Gets the id attribute of the page element on top of this pagestack
* @method currentPage
* @return {PageID|Null} - The topmost page's id attribute, else null when there are no pages on this pagestack
*/
currentPage: function () {
return this.isEmpty() ? null : this._pages[this._pages.length - 1];
},
/**
* Gets the number of pages in this pagestack
* @method depth
* @return {Number} - The number of pages in this pagestack
*/
depth: function () {
return this._pages.length;
},
/**
* Clears the whole page stack
* @method clear
*/
clear: function () {
if (this.isEmpty())
return;
__safeCall(Page.prototype.deactivate.bind(new Page(this.currentPage())), []);
this._pages = [];
},
/**
* Pops the current page off this pagestack, which causes the next page to become the top page and to display
* @method pop
*/
pop: function () {
if (this.isEmpty())
return;
__safeCall(Page.prototype.deactivate.bind(new Page(this.currentPage())), []);
this._pages.pop();
__safeCall(Page.prototype.activate.bind(new Page(this.currentPage())), []);
this.__dispatchPageChanged(this.currentPage());
},
onPageChanged : function(callback){
this._pagestack.addEventListener("pagechanged", callback);
},
/**
* @private
*/
__setAllPagesVisibility: function (visible) {
var visibility = visible ? "block" : "none";
var children = [].slice.call(this._pagestack.children);
children.forEach(function(element) {
var pageHelper = new Page();
if (pageHelper.isPage(element)) {
el.style.display = visibility;
// treat footers separately
var footer = el.querySelector('footer');
if (footer)
footer.style.display = visibility;
}
});
},
/**
* @private
*/
__isPage: function (element) {
return element.getAttribute('data-role') === 'page';
},
/**
* @private
*/
__dispatchPageChanged: function (page) {
var event = document.createEvent('Event');
event.initEvent('pagechanged',true,true);
event.page = page;
this._pagestack.dispatchEvent(event);
},
};
return Pagestack;
})();
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