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/**
* $Id: mxGenericChangeCodec.js,v 1.11 2010-09-13 15:50:36 gaudenz Exp $
* Copyright (c) 2006-2010, JGraph Ltd
*/
/**
* Class: mxGenericChangeCodec
*
* Codec for <mxValueChange>s, <mxStyleChange>s, <mxGeometryChange>s,
* <mxCollapseChange>s and <mxVisibleChange>s. This class is created
* and registered dynamically at load time and used implicitely
* via <mxCodec> and the <mxCodecRegistry>.
*
* Transient Fields:
*
* - model
* - previous
*
* Reference Fields:
*
* - cell
*
* Constructor: mxGenericChangeCodec
*
* Factory function that creates a <mxObjectCodec> for
* the specified change and fieldname.
*
* Parameters:
*
* obj - An instance of the change object.
* variable - The fieldname for the change data.
*/
var mxGenericChangeCodec = function(obj, variable)
{
var codec = new mxObjectCodec(obj, ['model', 'previous'], ['cell']);
/**
* Function: afterDecode
*
* Restores the state by assigning the previous value.
*/
codec.afterDecode = function(dec, node, obj)
{
// Allows forward references in sessions. This is a workaround
// for the sequence of edits in mxGraph.moveCells and cellsAdded.
if (mxUtils.isNode(obj.cell))
{
obj.cell = dec.decodeCell(obj.cell, false);
}
obj.previous = obj[variable];
return obj;
};
return codec;
};
// Registers the codecs
mxCodecRegistry.register(mxGenericChangeCodec(new mxValueChange(), 'value'));
mxCodecRegistry.register(mxGenericChangeCodec(new mxStyleChange(), 'style'));
mxCodecRegistry.register(mxGenericChangeCodec(new mxGeometryChange(), 'geometry'));
mxCodecRegistry.register(mxGenericChangeCodec(new mxCollapseChange(), 'collapsed'));
mxCodecRegistry.register(mxGenericChangeCodec(new mxVisibleChange(), 'visible'));
mxCodecRegistry.register(mxGenericChangeCodec(new mxCellAttributeChange(), 'value'));
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