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/**
* @class YAHOO.ext.Layer
* @extends YAHOO.ext.Element
* An extended Element object that supports a shadow and shim, constrain to viewport and
* automatic maintaining of shadow/shim positions.
* @cfg {Boolean} shim False to disable the iframe shim in browsers which need one (defaults to true)
* @cfg {String/Boolean} shadow True to create a shadow element with default class "ylayer-shadow" or
* you can pass a string with a css class name. False turns off the shadow.
* @cfg {Object} dh DomHelper object config to create element with (defaults to {tag: 'div', cls: 'ylayer'}).
* @cfg {Boolean} constrain False to disable constrain to viewport (defaults to true)
* @cfg {String} cls CSS class to add to the element
* @cfg {Number} zindex Starting z-index (defaults to 11000!)
* @cfg {Number} shadowOffset Offset for the shadow (defaults to 3)
* @constructor
* @param {Object} config
* @param {String/HTMLElement} existingEl (optional) Uses an existing dom element. If the element is not found it creates it.
*/
YAHOO.ext.Layer = function(config, existingEl){
config = config || {};
var dh = YAHOO.ext.DomHelper;
if(existingEl){
this.dom = YAHOO.util.Dom.get(existingEl);
}
if(!this.dom){
var o = config.dh || {tag: 'div', cls: 'ylayer'};
this.dom = dh.insertBefore(document.body.firstChild, o);
}
if(config.cls){
this.addClass(config.cls);
}
this.constrain = config.constrain !== false;
this.visibilityMode = YAHOO.ext.Element.VISIBILITY;
this.id = YAHOO.util.Dom.generateId(this.dom);
var zindex = (config.zindex || parseInt(this.getStyle('z-index'), 10)) || 11000;
this.setAbsolutePositioned(zindex);
if(config.shadow){
var cls = (typeof config.shadow == 'string' ? config.shadow : 'ylayer-shadow');
this.shadow = dh.insertBefore(this.dom,
{tag: 'div', cls: cls}, true);
this.shadowOffset = config.shadowOffset || 3;
this.shadow.setAbsolutePositioned(zindex-1);
}else{
this.shadowOffset = 0;
}
var b = YAHOO.ext.util.Browser;
if(config.shim !== false && (b.isIE || (b.isGecko && b.isMac))){
this.shim = this.createShim();
this.shim.setOpacity(0);
this.shim.setAbsolutePositioned(zindex-2);
}
this.hide();
};
YAHOO.extendX(YAHOO.ext.Layer, YAHOO.ext.Element, {
sync : function(doShow){
if(this.isVisible() && (this.shadow || this.shim)){
var b = this.getBox();
if(this.shim){
if(doShow){
this.shim.show();
}
this.shim.setBox(b);
}
if(this.shadow){
if(doShow){
this.shadow.show();
}
b.x += this.shadowOffset;
b.y += this.shadowOffset;
this.shadow.setBox(b);
}
}
},
syncLocalXY : function(){
var l = this.getLeft(true);
var t = this.getTop(true);
if(this.shim){
this.shim.setLeftTop(l, t);
}
if(this.shadow){
this.shadow.setLeftTop(l + this.shadowOffset,
t + this.shadowOffset);
}
},
hideUnders : function(negOffset){
if(this.shadow){
this.shadow.hide();
if(negOffset){
this.shadow.setLeftTop(-10000,-10000);
}
}
if(this.shim){
this.shim.hide();
if(negOffset){
this.shim.setLeftTop(-10000,-10000);
}
}
},
constrainXY : function(){
if(this.constrain){
var vw = YAHOO.util.Dom.getViewportWidth(),
vh = YAHOO.util.Dom.getViewportHeight();
var xy = this.getXY();
var x = xy[0], y = xy[1];
var w = this.dom.offsetWidth+this.shadowOffset, h = this.dom.offsetHeight+this.shadowOffset;
// only move it if it needs it
var moved = false;
// first validate right/bottom
if(x + w > vw){
x = vw - w;
moved = true;
}
if(y + h > vh){
y = vh - h;
moved = true;
}
// then make sure top/left isn't negative
if(x < 0){
x = 0;
moved = true;
}
if(y < 0){
y = 0;
moved = true;
}
if(moved){
xy = [x, y];
this.lastXY = xy;
this.beforeAction();
YAHOO.ext.Layer.superclass.setXY.call(this, xy);
this.sync(true);
}
}
},
setVisible : function(v, a, d, c, e){
if(this.lastXY){
YAHOO.ext.Layer.superclass.setXY.call(this, this.lastXY);
}
if(a && v){
var cb = function(){
this.sync(true);
if(c){
c();
}
}.createDelegate(this);
YAHOO.ext.Layer.superclass.setVisible.call(this, true, true, d, cb, e);
}else{
if(!v){
this.hideUnders(true);
}
var cb = c;
if(a){
cb = function(){
this.setLeftTop(-10000,-10000);
if(c){
c();
}
}.createDelegate(this);
}
YAHOO.ext.Layer.superclass.setVisible.call(this, v, a, d, cb, e);
if(v){
this.sync(true);
}else if(!a){
this.setLeftTop(-10000,-10000);
}
}
},
beforeAction : function(){
if(this.shadow){
this.shadow.hide();
}
},
setXY : function(xy, a, d, c, e){
this.lastXY = xy;
this.beforeAction();
var cb = this.createCB(c);
YAHOO.ext.Layer.superclass.setXY.call(this, xy, a, d, cb, e);
if(!a){
cb();
}
},
createCB : function(c){
var el = this;
return function(){
el.constrainXY();
el.sync(true);
if(c){
c();
}
};
},
setX : function(x, a, d, c, e){
this.setXY([x, this.getY()], a, d, c, e);
},
setY : function(y, a, d, c, e){
this.setXY([this.getX(), y], a, d, c, e);
},
setSize : function(w, h, a, d, c, e){
this.beforeAction();
var cb = this.createCB(c);
YAHOO.ext.Layer.superclass.setSize.call(this, w, h, a, d, cb, e);
if(!a){
cb();
}
},
setWidth : function(w, a, d, c, e){
this.beforeAction();
var cb = this.createCB(c);
YAHOO.ext.Layer.superclass.setWidth.call(this, w, a, d, cb, e);
if(!a){
cb();
}
},
setHeight : function(h, a, d, c, e){
this.beforeAction();
var cb = this.createCB(c);
YAHOO.ext.Layer.superclass.setHeight.call(this, h, a, d, cb, e);
if(!a){
cb();
}
},
setBounds : function(x, y, w, h, a, d, c, e){
this.beforeAction();
var cb = this.createCB(c);
if(!a){
YAHOO.ext.Layer.superclass.setXY.call(this, [x, y]);
YAHOO.ext.Layer.superclass.setSize.call(this, w, h, a, d, cb, e);
cb();
}else{
YAHOO.ext.Layer.superclass.setBounds.call(this, x, y, w, h, a, d, cb, e);
}
return this;
}
});
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