source: [view]
if(this.refNode && !this._relativePosition){
var refPos = dojo.position(dojo.byId(this.refNode)),
thisPos = dojo.position(this.domNode),
viewPort = dojo.window.getBox();
if(refPos.x < 0){
refPos.x = 0;
}
if(refPos.x + refPos.w > viewPort.w){
refPos.w = viewPort.w - refPos.x;
}
if(refPos.y < 0){
refPos.y = 0;
}
if(refPos.y + refPos.h > viewPort.h){
refPos.h = viewPort.h - refPos.y;
}
refPos.x = refPos.x + refPos.w / 2 - thisPos.w / 2;
refPos.y = refPos.y + refPos.h / 2 - thisPos.h / 2;
if(refPos.x >= 0 && refPos.x + thisPos.w <= viewPort.w &&
refPos.y >= 0 && refPos.y + thisPos.h <= viewPort.h){
this._relativePosition = refPos;
}
}
this.inherited(arguments);