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/*
* Material Experience - History Manager Class
*
* EYEMG - Interactive Media Group
* Created by Mike Crute (mcrute@eyemg.com)
* Updated by Mike Crute (mcrute@eyemg.com) on 9/26/07
*/
var HistoryManager = Class.create();
Object.extend(HistoryManager.prototype,
{
/*
* Sets up the history storage array and initializes the last
* event to nothing.
*/
initialize: function()
{
this.historyStore = $H();
this.lastEvent = null;
},
/*
* Clears the window hash. Generally called when a card closes.
*/
clearHash: function()
{
window.location.hash = '#';
},
/*
* Register an event with the history manager. Also updates the
* window hash to reflect the event. This is the only way to
* register an event with the history manager.
*/
registerEvent: function(type, title, url)
{
window.location.hash = '#' + type + url;
// If you don't set this explicitly IE will show the hash as
// the document title.
document.title = Strings.appTitle;
this.lastEvent = '#' + type + url;
this.historyStore[type + url] = title;
return this;
},
/*
* Stops polling the URL for new events.
*/
stopPolling: function()
{
this.poller.stop();
return this;
},
/*
* Starts polling the URL for new events and will execute the event
* handler if an event occurs.
*/
pollEvents: function()
{
this.poller = new PeriodicalExecuter(function()
{
// Make sure there is a valid hash and it is NOT the card
// that we just loaded (prevent double-carding)
if (
this.lastEvent != window.location.hash &&
window.location.hash != '#' &&
window.location.hash != ''
) {
this.lastEvent = window.location.hash;
this._handleEvents();
}
}.bind(this), 0.1);
return this;
},
/*
* Handles an event, this is called internally by the pollEvents function
* when a new event occurs and should never be called directly.
*/
_handleEvents: function()
{
// Breaks down the event type and parameters from the hash
var evtTypes = /^(card|table|preview)/;
var hash = window.location.hash;
// When IE does the split it only returns one array element,
// the parameter, so we have to do a little magic to match
// the action too. All other browsers seem to work correctly.
var fullEvt = hash.substr(1, hash.length).split(evtTypes).without('');
var eventType = (fullEvt.length == 1) ? hash.substr(1, hash.length).match(evtTypes)[0] : fullEvt[0];
var eventParam = (fullEvt.length == 1) ? fullEvt : fullEvt[1];
// Hide the current card if there is one
if (SME.currentCard && SME.currentCard.hide)
{
SME.currentCard.hide();
}
switch (eventType)
{
case 'table':
CardTable.showTable(eventParam);
return;
break;
case 'card':
theURL = SME.url.cards.evaluate({card: eventParam});
break;
case 'preview':
theURL = SME.url.cardPreview.evaluate({card: eventParam});
this.stopPolling();
break;
default:
return;
break;
}
new Ajax.Request(theURL,
{
method: 'get',
onSuccess: function(transport)
{
var data = transport.responseText.cleanJSON().evalJSON();
var card = new Card(
{
color: CardTable.tableColor(data.type),
contID: eventParam,
title: data.title,
preview: (eventType == 'preview') ? true : false
});
this.registerEvent(eventType, data.title, eventParam);
card.show();
}.bind(this)
});
},
/*
* Creates and populates the history dropdown based on the
* events stored in the history storage array. Also handles
* showing, hiding and positioning that menu.
*/
getDropDown: function(x, y)
{
var dropdown = $('history');
// If no x and y then position the menu for the my history
// dropdown from the tools menu.
x = x ? x : 20;
y = y ? y : 26;
// Remove and re-append the menu from the DOM, this prevents
// IE z-index bugs.
document.body.appendChild(dropdown.remove());
dropdown.innerHTML = '';
// Populate the menu
this.historyStore.each(function(item)
{
dropdown.appendChild(Builder.node('li', {}, Builder.node('a', { href: '#' + item.key }, item.value)));
});
// Initially show the menu
dropdown.addClassName('hovered');
// Must explicitly set left to nothing otherwise positioning
// is wrong.
dropdown.setStyle(
{
right: x + 'px',
top: y + 'px',
left: '',
zIndex: 9999
});
// Hide the menu when the user...
$H({
'#history a' : 'click', // Clicks on a link
'div.table' : 'mouseover', // Mouses-off onto a table
'p' : 'mouseover', // Mouses-off onto a paragraph
'iframe' : 'mouseover', // Mouses-off onto an iframe
'img' : 'mouseover' // Mouses-off onto an image
}).each(function(aitem)
{
$$(aitem.key).each(function(item)
{
item.observe(aitem.value, function()
{
if ($('history').hasClassName('hovered'))
{
$('history').removeClassName('hovered');
}
});
});
});
}
});
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