Does the duplicate clone method of Position serve a subtle purpose
that I don't understand? I feel kind of foolish even asking, but ...
I just don't get it. I've been looking at this for a couple days now
and as far as I can tell, the first definition is useless as it gets
overlaid by the second one. I don't see any closure trickery going on
here, either. I'm surprised to find something like this in what is
otherwise beautiful code.
clone: function(source, target) {
source = $(source);
target = $(target);
target.style.position = 'absolute';
var offsets = this.cumulativeOffset(source);
target.style.top = offsets[1] + 'px';
target.style.left = offsets[0] + 'px';
target.style.width = source.offsetWidth + 'px';
target.style.height = source.offsetHeight + 'px';
},
clone: function(source, target) {
var options = Object.extend({
setLeft: true,
setTop: true,
setWidth: true,
setHeight: true,
offsetTop: 0,
offsetLeft: 0
}, arguments[2] || {})
// find page position of source
source = $(source);
var p = Position.page(source);
// find coordinate system to use
target = $(target);
var delta = [0, 0];
var parent = null;
// delta [0,0] will do fine with position: fixed elements,
// position:absolute needs offsetParent deltas
if (Element.getStyle(target,'position') == 'absolute') {
parent = Position.offsetParent(target);
delta = Position.page(parent);
}
// correct by body offsets (fixes Safari)
if (parent == document.body) {
delta[0] -= document.body.offsetLeft;
delta[1] -= document.body.offsetTop;
}
// set position
if(options.setLeft) target.style.left = (p[0] - delta[0] +
options.offsetLeft) + 'px';
if(options.setTop) target.style.top = (p[1] - delta[1] +
options.offsetTop) + 'px';
if(options.setWidth) target.style.width = source.offsetWidth + 'px';
if(options.setHeight) target.style.height = source.offsetHeight + 'px';
},
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