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<!--
$Id: dynamicstyle.html,v 1.1 2012/11/15 13:26:40 gaudenz Exp $
Copyright (c) 2006-2010, JGraph Ltd
Dynamic Style example for mxGraph. This example demonstrates changing
the style of a cell dynamically by overriding mxGraphModel.getStyle.
-->
<html>
<head>
<title>Dynamic Style example for mxGraph</title>
<!-- Sets the basepath for the library if not in same directory -->
<script type="text/javascript">
mxBasePath = '../src';
</script>
<!-- Loads and initializes the library -->
<script type="text/javascript" src="../src/js/mxClient.js"></script>
<!-- Example code -->
<script type="text/javascript">
// Program starts here. Creates a sample graph in the
// DOM node with the specified ID. This function is invoked
// from the onLoad event handler of the document (see below).
function main(container)
{
// Checks if the browser is supported
if (!mxClient.isBrowserSupported())
{
// Displays an error message if the browser is not supported.
mxUtils.error('Browser is not supported!', 200, false);
}
else
{
// Creates the graph inside the given container
var graph = new mxGraph(container);
// Disables moving of edge labels in this examples
graph.edgeLabelsMovable = false;
// Enables rubberband selection
new mxRubberband(graph);
// Needs to set a flag to check for dynamic style changes,
// that is, changes to styles on cells where the style was
// not explicitely changed using mxStyleChange
graph.getView().updateStyle = true;
// Overrides mxGraphModel.getStyle to return a specific style
// for edges that reflects their target terminal (in this case
// the strokeColor will be equal to the target's fillColor).
var previous = graph.model.getStyle;
graph.model.getStyle = function(cell)
{
if (cell != null)
{
var style = previous.apply(this, arguments);
if (this.isEdge(cell))
{
var target = this.getTerminal(cell, false);
if (target != null)
{
var state = graph.getView().getState(target);
var targetStyle = (state != null) ? state.style : graph.getCellStyle(target);
var fill = mxUtils.getValue(targetStyle, mxConstants.STYLE_FILLCOLOR);
if (fill != null)
{
style += ';strokeColor='+fill;
}
}
}
else if (this.isVertex(cell))
{
var geometry = this.getGeometry(cell);
if (geometry != null &&
geometry.width > 80)
{
style += ';fillColor=green';
}
}
return style;
}
return null;
};
// Gets the default parent for inserting new cells. This
// is normally the first child of the root (ie. layer 0).
var parent = graph.getDefaultParent();
// Adds cells to the model in a single step
graph.getModel().beginUpdate();
try
{
var v1 = graph.insertVertex(parent, null, 'Hello,', 20, 20, 80, 30, 'fillColor=green');
var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30, 'fillColor=blue');
var v3 = graph.insertVertex(parent, null, 'World!', 20, 150, 80, 30, 'fillColor=red');
var e1 = graph.insertEdge(parent, null, 'Connect', v1, v2, 'perimeterSpacing=4;strokeWidth=4;labelBackgroundColor=white;fontStyle=1');
}
finally
{
// Updates the display
graph.getModel().endUpdate();
}
}
};
</script>
</head>
<!-- Page passes the container for the graph to the program -->
<body onload="main(document.getElementById('graphContainer'))">
<!-- Creates a container for the graph with a grid wallpaper -->
<div id="graphContainer"
style="overflow:hidden;width:321px;height:241px;background:url('editors/images/grid.gif')">
</div>
</body>
</html>