var Spry;
if (!Spry) Spry = {};
if (!Spry.Widget) Spry.Widget = {};

Spry.Widget.Accordion = function(element, opts)
{
this.element = this.getElement(element);
this.defaultPanel = 0;
this.hoverClass = "AccordionPanelTabHover";
this.openClass = "AccordionPanelOpen";
this.closedClass = "AccordionPanelClosed";
this.focusedClass = "AccordionFocused";
this.enableAnimation = true;
this.enableKeyboardNavigation = true;
this.currentPanel = null;
this.animator = null;
this.hasFocus = null;

this.previousPanelKeyCode = Spry.Widget.Accordion.KEY_UP;
this.nextPanelKeyCode = Spry.Widget.Accordion.KEY_DOWN;

this.useFixedPanelHeights = true;
this.fixedPanelHeight = 0;

Spry.Widget.Accordion.setOptions(this, opts, true);

this.attachBehaviors();
};

Spry.Widget.Accordion.prototype.getElement = function(ele)
{
if (ele && typeof ele == "string")
return document.getElementById(ele);
return ele;
};

Spry.Widget.Accordion.prototype.addClassName = function(ele, className)
{
if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) != -1))
return;
ele.className += (ele.className ? " " : "") + className;
};

Spry.Widget.Accordion.prototype.removeClassName = function(ele, className)
{
if (!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) == -1))
return;
ele.className = ele.className.replace(new RegExp("\\s*\\b" + className + "\\b", "g"), "");
};

Spry.Widget.Accordion.setOptions = function(obj, optionsObj, ignoreUndefinedProps)
{
if (!optionsObj)
return;
for (var optionName in optionsObj)
{
if (ignoreUndefinedProps && optionsObj[optionName] == undefined)
continue;
obj[optionName] = optionsObj[optionName];
}
};

Spry.Widget.Accordion.prototype.onPanelTabMouseOver = function(e, panel)
{
if (panel)
this.addClassName(this.getPanelTab(panel), this.hoverClass);
return false;
};

Spry.Widget.Accordion.prototype.onPanelTabMouseOut = function(e, panel)
{
if (panel)
this.removeClassName(this.getPanelTab(panel), this.hoverClass);
return false;
};

Spry.Widget.Accordion.prototype.openPanel = function(elementOrIndex)
{
var panelA = this.currentPanel;
var panelB;

if (typeof elementOrIndex == "number")
panelB = this.getPanels()[elementOrIndex];
else
panelB = this.getElement(elementOrIndex);

if (!panelB || panelA == panelB)
return null;

var contentA = panelA ? this.getPanelContent(panelA) : null;
var contentB = this.getPanelContent(panelB);

if (!contentB)
return null;

if (this.useFixedPanelHeights && !this.fixedPanelHeight)
this.fixedPanelHeight = (contentA.offsetHeight) ? contentA.offsetHeight : contentA.scrollHeight;

if (this.enableAnimation)
{
if (this.animator)
this.animator.stop();
this.animator = new Spry.Widget.Accordion.PanelAnimator(this, panelB, { duration: this.duration, fps: this.fps, transition: this.transition });
this.animator.start();
}
else
{
if(contentA)
{
contentA.style.display = "none";
contentA.style.height = "0px";
}
contentB.style.display = "block";
contentB.style.height = this.useFixedPanelHeights ? this.fixedPanelHeight + "px" : "auto";
}

if(panelA)
{
this.removeClassName(panelA, this.openClass);
this.addClassName(panelA, this.closedClass);
}

this.removeClassName(panelB, this.closedClass);
this.addClassName(panelB, this.openClass);

this.currentPanel = panelB;

return panelB;
};

Spry.Widget.Accordion.prototype.closePanel = function()
{
// The accordion can only ever have one panel open at any
// give time, so this method only closes the current panel.
// If the accordion is in fixed panel heights mode, this
// method does nothing.

if (!this.useFixedPanelHeights && this.currentPanel)
{
var panel = this.currentPanel;
var content = this.getPanelContent(panel);
if (content)
{
if (this.enableAnimation)
{
if (this.animator)
this.animator.stop();
this.animator = new Spry.Widget.Accordion.PanelAnimator(this, null, { duration: this.duration, fps: this.fps, transition: this.transition });
this.animator.start();
}
else
{
content.style.display = "none";
content.style.height = "0px";
}
}
this.removeClassName(panel, this.openClass);
this.addClassName(panel, this.closedClass);
this.currentPanel = null;
}
};

Spry.Widget.Accordion.prototype.openNextPanel = function()
{
return this.openPanel(this.getCurrentPanelIndex() + 1);
};

Spry.Widget.Accordion.prototype.openPreviousPanel = function()
{
return this.openPanel(this.getCurrentPanelIndex() - 1);
};

Spry.Widget.Accordion.prototype.openFirstPanel = function()
{
return this.openPanel(0);
};

Spry.Widget.Accordion.prototype.openLastPanel = function()
{
var panels = this.getPanels();
return this.openPanel(panels[panels.length - 1]);
};

Spry.Widget.Accordion.prototype.onPanelTabClick = function(e, panel)
{
if (panel != this.currentPanel)
this.openPanel(panel);
else
this.closePanel();

if (this.enableKeyboardNavigation)
this.focus();

if (e.preventDefault) e.preventDefault();
else e.returnValue = false;
if (e.stopPropagation) e.stopPropagation();
else e.cancelBubble = true;

return false;
};

Spry.Widget.Accordion.prototype.onFocus = function(e)
{
this.hasFocus = true;
this.addClassName(this.element, this.focusedClass);
return false;
};

Spry.Widget.Accordion.prototype.onBlur = function(e)
{
this.hasFocus = false;
this.removeClassName(this.element, this.focusedClass);
return false;
};

Spry.Widget.Accordion.KEY_UP = 38;
Spry.Widget.Accordion.KEY_DOWN = 40;

Spry.Widget.Accordion.prototype.onKeyDown = function(e)
{
var key = e.keyCode;
if (!this.hasFocus || (key != this.previousPanelKeyCode && key != this.nextPanelKeyCode))
return true;

var panels = this.getPanels();
if (!panels || panels.length < 1)
return false;
var currentPanel = this.currentPanel ? this.currentPanel : panels[0];
var nextPanel = (key == this.nextPanelKeyCode) ? currentPanel.nextSibling : currentPanel.previousSibling;

while (nextPanel)
{
if (nextPanel.nodeType == 1 /* Node.ELEMENT_NODE */)
break;
nextPanel = (key == this.nextPanelKeyCode) ? nextPanel.nextSibling : nextPanel.previousSibling;
}

if (nextPanel && currentPanel != nextPanel)
this.openPanel(nextPanel);

if (e.preventDefault) e.preventDefault();
else e.returnValue = false;
if (e.stopPropagation) e.stopPropagation();
else e.cancelBubble = true;

return false;
};

Spry.Widget.Accordion.prototype.attachPanelHandlers = function(panel)
{
if (!panel)
return;

var tab = this.getPanelTab(panel);

if (tab)
{
var self = this;
Spry.Widget.Accordion.addEventListener(tab, "click", function(e) { return self.onPanelTabClick(e, panel); }, false);
Spry.Widget.Accordion.addEventListener(tab, "mouseover", function(e) { return self.onPanelTabMouseOver(e, panel); }, false);
Spry.Widget.Accordion.addEventListener(tab, "mouseout", function(e) { return self.onPanelTabMouseOut(e, panel); }, false);
}
};

Spry.Widget.Accordion.addEventListener = function(element, eventType, handler, capture)
{
try
{
if (element.addEventListener)
element.addEventListener(eventType, handler, capture);
else if (element.attachEvent)
element.attachEvent("on" + eventType, handler);
}
catch (e) {}
};

Spry.Widget.Accordion.prototype.initPanel = function(panel, isDefault)
{
var content = this.getPanelContent(panel);
if (isDefault)
{
this.currentPanel = panel;
this.removeClassName(panel, this.closedClass);
this.addClassName(panel, this.openClass);

// Attempt to set up the height of the default panel. We don't want to
// do any dynamic panel height calculations here because our accordion
// or one of its parent containers may be display:none.

if (content)
{
if (this.useFixedPanelHeights)
{
// We are in fixed panel height mode and the user passed in
// a panel height for us to use.

if (this.fixedPanelHeight)
content.style.height = this.fixedPanelHeight + "px";
}
else
{
// We are in variable panel height mode, but since we can't
// calculate the panel height here, we just set the height to
// auto so that it expands to show all of its content.

content.style.height = "auto";
}
}
}
else
{
this.removeClassName(panel, this.openClass);
this.addClassName(panel, this.closedClass);

if (content)
{
content.style.height = "0px";
content.style.display = "none";
}
}

this.attachPanelHandlers(panel);
};

Spry.Widget.Accordion.prototype.attachBehaviors = function()
{
var panels = this.getPanels();
for (var i = 0; i < panels.length; i++)
this.initPanel(panels[i], i == this.defaultPanel);

// Advanced keyboard navigation requires the tabindex attribute
// on the top-level element.

this.enableKeyboardNavigation = (this.enableKeyboardNavigation && this.element.attributes.getNamedItem("tabindex"));
if (this.enableKeyboardNavigation)
{
var self = this;
Spry.Widget.Accordion.addEventListener(this.element, "focus", function(e) { return self.onFocus(e); }, false);
Spry.Widget.Accordion.addEventListener(this.element, "blur", function(e) { return self.onBlur(e); }, false);
Spry.Widget.Accordion.addEventListener(this.element, "keydown", function(e) { return self.onKeyDown(e); }, false);
}
};

Spry.Widget.Accordion.prototype.getPanels = function()
{
return this.getElementChildren(this.element);
};

Spry.Widget.Accordion.prototype.getCurrentPanel = function()
{
return this.currentPanel;
};

Spry.Widget.Accordion.prototype.getPanelIndex = function(panel)
{
var panels = this.getPanels();
for( var i = 0 ; i < panels.length; i++ )
{
if( panel == panels[i] )
return i;
}
return -1;
};

Spry.Widget.Accordion.prototype.getCurrentPanelIndex = function()
{
return this.getPanelIndex(this.currentPanel);
};

Spry.Widget.Accordion.prototype.getPanelTab = function(panel)
{
if (!panel)
return null;
return this.getElementChildren(panel)[0];
};

Spry.Widget.Accordion.prototype.getPanelContent = function(panel)
{
if (!panel)
return null;
return this.getElementChildren(panel)[1];
};

Spry.Widget.Accordion.prototype.getElementChildren = function(element)
{
var children = [];
var child = element.firstChild;
while (child)
{
if (child.nodeType == 1 /* Node.ELEMENT_NODE */)
children.push(child);
child = child.nextSibling;
}
return children;
};

Spry.Widget.Accordion.prototype.focus = function()
{
if (this.element && this.element.focus)
this.element.focus();
};

Spry.Widget.Accordion.prototype.blur = function()
{
if (this.element && this.element.blur)
this.element.blur();
};

/////////////////////////////////////////////////////

Spry.Widget.Accordion.PanelAnimator = function(accordion, panel, opts)
{
this.timer = null;
this.interval = 0;

this.fps = 60;
this.duration = 500;
this.startTime = 0;

this.transition = Spry.Widget.Accordion.PanelAnimator.defaultTransition;

this.onComplete = null;

this.panel = panel;
this.panelToOpen = accordion.getElement(panel);
this.panelData = [];
this.useFixedPanelHeights = accordion.useFixedPanelHeights;

Spry.Widget.Accordion.setOptions(this, opts, true);

this.interval = Math.floor(1000 / this.fps);

// Set up the array of panels we want to animate.

var panels = accordion.getPanels();
for (var i = 0; i < panels.length; i++)
{
var p = panels[i];
var c = accordion.getPanelContent(p);
if (c)
{
var h = c.offsetHeight;
if (h == undefined)
h = 0;

if (p == panel && h == 0)
c.style.display = "block";

if (p == panel || h > 0)
{
var obj = new Object;
obj.panel = p;
obj.content = c;
obj.fromHeight = h;
obj.toHeight = (p == panel) ? (accordion.useFixedPanelHeights ? accordion.fixedPanelHeight : c.scrollHeight) : 0;
obj.distance = obj.toHeight - obj.fromHeight;
obj.overflow = c.style.overflow;
this.panelData.push(obj);

c.style.overflow = "hidden";
c.style.height = h + "px";
}
}
}
};

Spry.Widget.Accordion.PanelAnimator.defaultTransition = function(time, begin, finish, duration) { time /= duration; return begin + ((2 - time) * time * finish); };

Spry.Widget.Accordion.PanelAnimator.prototype.start = function()
{
var self = this;
this.startTime = (new Date).getTime();
this.timer = setTimeout(function() { self.stepAnimation(); }, this.interval);
};

Spry.Widget.Accordion.PanelAnimator.prototype.stop = function()
{
if (this.timer)
{
clearTimeout(this.timer);

// If we're killing the timer, restore the overflow
// properties on the panels we were animating!

for (i = 0; i < this.panelData.length; i++)
{
obj = this.panelData[i];
obj.content.style.overflow = obj.overflow;
}
}

this.timer = null;
};

Spry.Widget.Accordion.PanelAnimator.prototype.stepAnimation = function()
{
var curTime = (new Date).getTime();
var elapsedTime = curTime - this.startTime;

var i, obj;

if (elapsedTime >= this.duration)
{
for (i = 0; i < this.panelData.length; i++)
{
obj = this.panelData[i];
if (obj.panel != this.panel)
{
obj.content.style.display = "none";
obj.content.style.height = "0px";
}
obj.content.style.overflow = obj.overflow;
obj.content.style.height = (this.useFixedPanelHeights || obj.toHeight == 0) ? obj.toHeight + "px" : "auto";
}
if (this.onComplete)
this.onComplete();
return;
}

for (i = 0; i < this.panelData.length; i++)
{
obj = this.panelData[i];
var ht = this.transition(elapsedTime, obj.fromHeight, obj.distance, this.duration);
obj.content.style.height = ((ht < 0) ? 0 : ht) + "px";
}

<!-- inicia referencia al código JavaScript del componente Accordion -->
<script src="SpryAccordion.js" type="text/javascript"><!--mce:0--></script>
<!-- termina referencia al código JavaScript del componente Accordion -->
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