Layer.js
/**
* @class Ext.Layer
* @extends 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 "x-layer-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: "x-layer"}).
* @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 Number of pixels to offset the shadow (defaults to 3)
* @constructor
* @param {Object} config
* @param {String/HTMLElement} existingEl （可选） Uses an existing dom element. If the element is not found it creates it.
*/
(function(){
Ext.Layer = function(config, existingEl){
config = config || {};
var dh = Ext.DomHelper;
var cp = config.parentEl, pel = cp ? Ext.getDom(cp) : document.body;
if(existingEl){
this.dom = Ext.getDom(existingEl);
}
if(!this.dom){
var o = config.dh || {tag: "div", cls: "x-layer"};
this.dom = dh.append(pel, o);
}
if(config.cls){
this.addClass(config.cls);
}
this.constrain = config.constrain !== false;
this.visibilityMode = Ext.Element.VISIBILITY;
if(config.id){
this.id = this.dom.id = config.id;
}else{
this.id = Ext.id(this.dom);
}
this.zindex = config.zindex || this.getZIndex();
this.position("absolute", this.zindex);
if(config.shadow){
this.shadowOffset = config.shadowOffset || 4;
this.shadow = new Ext.Shadow({
offset : this.shadowOffset,
mode : config.shadow
});
}else{
this.shadowOffset = 0;
}
this.useShim = config.shim !== false && Ext.useShims;
this.useDisplay = config.useDisplay;
this.hide();
};
var supr = Ext.Element.prototype;
// shims are shared among layer to keep from having 100 iframes
var shims = [];
Ext.extend(Ext.Layer, Ext.Element, {
getZIndex : function(){
return this.zindex || parseInt(this.getStyle("z-index"), 10) || 11000;
},
getShim : function(){
if(!this.useShim){
return null;
}
if(this.shim){
return this.shim;
}
var shim = shims.shift();
if(!shim){
shim = this.createShim();
shim.enableDisplayMode('block');
shim.dom.style.display = 'none';
shim.dom.style.visibility = 'visible';
}
var pn = this.dom.parentNode;
if(shim.dom.parentNode != pn){
pn.insertBefore(shim.dom, this.dom);
}
shim.setStyle('z-index', this.getZIndex()-2);
this.shim = shim;
return shim;
},
hideShim : function(){
if(this.shim){
this.shim.setDisplayed(false);
shims.push(this.shim);
delete this.shim;
}
},
disableShadow : function(){
if(this.shadow){
this.shadowDisabled = true;
this.shadow.hide();
this.lastShadowOffset = this.shadowOffset;
this.shadowOffset = 0;
}
},
enableShadow : function(show){
if(this.shadow){
this.shadowDisabled = false;
this.shadowOffset = this.lastShadowOffset;
delete this.lastShadowOffset;
if(show){
this.sync(true);
}
}
},
// private
// this code can execute repeatedly in milliseconds (i.e. during a drag) so
// code size was sacrificed for effeciency (e.g. no getBox/setBox, no XY calls)
sync : function(doShow){
var sw = this.shadow;
if(!this.updating && this.isVisible() && (sw || this.useShim)){
var sh = this.getShim();
var w = this.getWidth(),
h = this.getHeight();
var l = this.getLeft(true),
t = this.getTop(true);
if(sw && !this.shadowDisabled){
if(doShow && !sw.isVisible()){
sw.show(this);
}else{
sw.realign(l, t, w, h);
}
if(sh){
if(doShow){
sh.show();
}
// fit the shim behind the shadow, so it is shimmed too
var a = sw.adjusts, s = sh.dom.style;
s.left = (Math.min(l, l+a.l))+"px";
s.top = (Math.min(t, t+a.t))+"px";
s.width = (w+a.w)+"px";
s.height = (h+a.h)+"px";
}
}else if(sh){
if(doShow){
sh.show();
}
sh.setSize(w, h);
sh.setLeftTop(l, t);
}
}
},
// private
destroy : function(){
this.hideShim();
if(this.shadow){
this.shadow.hide();
}
this.removeAllListeners();
var pn = this.dom.parentNode;
if(pn){
pn.removeChild(this.dom);
}
Ext.Element.uncache(this.id);
},
remove : function(){
this.destroy();
},
// private
beginUpdate : function(){
this.updating = true;
},
// private
endUpdate : function(){
this.updating = false;
this.sync(true);
},
// private
hideUnders : function(negOffset){
if(this.shadow){
this.shadow.hide();
}
this.hideShim();
},
// private
constrainXY : function(){
if(this.constrain){
var vw = Ext.lib.Dom.getViewWidth(),
vh = Ext.lib.Dom.getViewHeight();
var s = Ext.get(document).getScroll();
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+s.left){
x = vw - w - this.shadowOffset;
moved = true;
}
if((y + h) > vh+s.top){
y = vh - h - this.shadowOffset;
moved = true;
}
// then make sure top/left isn't negative
if(x < s.left){
x = s.left;
moved = true;
}
if(y < s.top){
y = s.top;
moved = true;
}
if(moved){
if(this.avoidY){
var ay = this.avoidY;
if(y <= ay && (y+h) >= ay){
y = ay-h-5;
}
}
xy = [x, y];
this.storeXY(xy);
supr.setXY.call(this, xy);
this.sync();
}
}
},
isVisible : function(){
return this.visible;
},
// private
showAction : function(){
this.visible = true; // track visibility to prevent getStyle calls
if(this.useDisplay === true){
this.setDisplayed("");
}else if(this.lastXY){
supr.setXY.call(this, this.lastXY);
}else if(this.lastLT){
supr.setLeftTop.call(this, this.lastLT[0], this.lastLT[1]);
}
},
// private
hideAction : function(){
this.visible = false;
if(this.useDisplay === true){
this.setDisplayed(false);
}else{
this.setLeftTop(-10000,-10000);
}
},
// overridden Element method
setVisible : function(v, a, d, c, e){
if(v){
this.showAction();
}
if(a && v){
var cb = function(){
this.sync(true);
if(c){
c();
}
}.createDelegate(this);
supr.setVisible.call(this, true, true, d, cb, e);
}else{
if(!v){
this.hideUnders(true);
}
var cb = c;
if(a){
cb = function(){
this.hideAction();
if(c){
c();
}
}.createDelegate(this);
}
supr.setVisible.call(this, v, a, d, cb, e);
if(v){
this.sync(true);
}else if(!a){
this.hideAction();
}
}
},
storeXY : function(xy){
delete this.lastLT;
this.lastXY = xy;
},
storeLeftTop : function(left, top){
delete this.lastXY;
this.lastLT = [left, top];
},
// private
beforeFx : function(){
this.beforeAction();
return Ext.Layer.superclass.beforeFx.apply(this, arguments);
},
// private
afterFx : function(){
Ext.Layer.superclass.afterFx.apply(this, arguments);
this.sync(this.isVisible());
},
// private
beforeAction : function(){
if(!this.updating && this.shadow){
this.shadow.hide();
}
},
// overridden Element method
setLeft : function(left){
this.storeLeftTop(left, this.getTop(true));
supr.setLeft.apply(this, arguments);
this.sync();
},
setTop : function(top){
this.storeLeftTop(this.getLeft(true), top);
supr.setTop.apply(this, arguments);
this.sync();
},
setLeftTop : function(left, top){
this.storeLeftTop(left, top);
supr.setLeftTop.apply(this, arguments);
this.sync();
},
setXY : function(xy, a, d, c, e){
this.fixDisplay();
this.beforeAction();
this.storeXY(xy);
var cb = this.createCB(c);
supr.setXY.call(this, xy, a, d, cb, e);
if(!a){
cb();
}
},
// private
createCB : function(c){
var el = this;
return function(){
el.constrainXY();
el.sync(true);
if(c){
c();
}
};
},
// overridden Element method
setX : function(x, a, d, c, e){
this.setXY([x, this.getY()], a, d, c, e);
},
// overridden Element method
setY : function(y, a, d, c, e){
this.setXY([this.getX(), y], a, d, c, e);
},
// overridden Element method
setSize : function(w, h, a, d, c, e){
this.beforeAction();
var cb = this.createCB(c);
supr.setSize.call(this, w, h, a, d, cb, e);
if(!a){
cb();
}
},
// overridden Element method
setWidth : function(w, a, d, c, e){
this.beforeAction();
var cb = this.createCB(c);
supr.setWidth.call(this, w, a, d, cb, e);
if(!a){
cb();
}
},
// overridden Element method
setHeight : function(h, a, d, c, e){
this.beforeAction();
var cb = this.createCB(c);
supr.setHeight.call(this, h, a, d, cb, e);
if(!a){
cb();
}
},
// overridden Element method
setBounds : function(x, y, w, h, a, d, c, e){
this.beforeAction();
var cb = this.createCB(c);
if(!a){
this.storeXY([x, y]);
supr.setXY.call(this, [x, y]);
supr.setSize.call(this, w, h, a, d, cb, e);
cb();
}else{
supr.setBounds.call(this, x, y, w, h, a, d, cb, e);
}
return this;
},
/**
* Set the z-index of this layer and adjusts any shadow and shim z-indexes. The layer z-index is automatically
* incremented by two more than the value passed in so that it always shows above any shadow or shim (the shadow
* element, if any, will be assigned z-index + 1, and the shim element, if any, will be assigned the unmodified z-index).
* @param {Number} zindex The new z-index to set
* @return {this} The Layer
*/
setZIndex : function(zindex){
this.zindex = zindex;
this.setStyle("z-index", zindex + 2);
if(this.shadow){
this.shadow.setZIndex(zindex + 1);
}
if(this.shim){
this.shim.setStyle("z-index", zindex);
}
}
});
})();
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