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mxModelCodec.js
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80 lines (71 loc) · 1.69 KB
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/**
* $Id: mxModelCodec.js,v 1.1 2012/11/15 13:26:43 gaudenz Exp $
* Copyright (c) 2006-2010, JGraph Ltd
*/
mxCodecRegistry.register(function()
{
/**
* Class: mxModelCodec
*
* Codec for <mxGraphModel>s. This class is created and registered
* dynamically at load time and used implicitely via <mxCodec>
* and the <mxCodecRegistry>.
*/
var codec = new mxObjectCodec(new mxGraphModel());
/**
* Function: encodeObject
*
* Encodes the given <mxGraphModel> by writing a (flat) XML sequence of
* cell nodes as produced by the <mxCellCodec>. The sequence is
* wrapped-up in a node with the name root.
*/
codec.encodeObject = function(enc, obj, node)
{
var rootNode = enc.document.createElement('root');
enc.encodeCell(obj.getRoot(), rootNode);
node.appendChild(rootNode);
};
/**
* Function: decodeChild
*
* Overrides decode child to handle special child nodes.
*/
codec.decodeChild = function(dec, child, obj)
{
if (child.nodeName == 'root')
{
this.decodeRoot(dec, child, obj);
}
else
{
mxObjectCodec.prototype.decodeChild.apply(this, arguments);
}
};
/**
* Function: decodeRoot
*
* Reads the cells into the graph model. All cells
* are children of the root element in the node.
*/
codec.decodeRoot = function(dec, root, model)
{
var rootCell = null;
var tmp = root.firstChild;
while (tmp != null)
{
var cell = dec.decodeCell(tmp);
if (cell != null && cell.getParent() == null)
{
rootCell = cell;
}
tmp = tmp.nextSibling;
}
// Sets the root on the model if one has been decoded
if (rootCell != null)
{
model.setRoot(rootCell);
}
};
// Returns the codec into the registry
return codec;
}());