Mon 21 Jul 22:43:21 CEST 2025

js/ui/mxgraph/src/js/io/mxModelCodec.js

@@ -0,0 +1,80 @@
+/**
+ * Copyright (c) 2006-2015, JGraph Ltd
+ * Copyright (c) 2006-2015, Gaudenz Alder
+ */
+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;
+
+}());