<!--
Copyright (c) 2006-2013, JGraph Ltd
Control example for mxGraph. This example demonstrates adding
controls to specific cells in a graph.
-->
<html>
<head>
<title>Control 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);
graph.setPanning(true);
// Specifies the URL and size of the new control
var deleteImage = new mxImage('editors/images/overlays/forbidden.png', 16, 16);
// Overridden to add an additional control to the state at creation time
mxCellRendererCreateControl = mxCellRenderer.prototype.createControl;
mxCellRenderer.prototype.createControl = function(state)
{
mxCellRendererCreateControl.apply(this, arguments);
var graph = state.view.graph;
if (graph.getModel().isVertex(state.cell))
{
if (state.deleteControl == null)
{
var b = new mxRectangle(0, 0, deleteImage.width, deleteImage.height);
state.deleteControl = new mxImageShape(b, deleteImage.src);
state.deleteControl.dialect = graph.dialect;
state.deleteControl.preserveImageAspect = false;
this.initControl(state, state.deleteControl, false, function (evt)
{
if (graph.isEnabled())
{
graph.removeCells([state.cell]);
mxEvent.consume(evt);
}
});
}
}
else if (state.deleteControl != null)
{
state.deleteControl.destroy();
state.deleteControl = null;
}
};
// Helper function to compute the bounds of the control
var getDeleteControlBounds = function(state)
{
if (state.deleteControl != null)
{
var oldScale = state.deleteControl.scale;
var w = state.deleteControl.bounds.width / oldScale;
var h = state.deleteControl.bounds.height / oldScale;
var s = state.view.scale;
return (state.view.graph.getModel().isEdge(state.cell)) ?
new mxRectangle(state.x + state.width / 2 - w / 2 * s,
state.y + state.height / 2 - h / 2 * s, w * s, h * s)
: new mxRectangle(state.x + state.width - w * s,
state.y, w * s, h * s);
}
return null;
};
// Overridden to update the scale and bounds of the control
mxCellRendererRedrawControl = mxCellRenderer.prototype.redrawControl;
mxCellRenderer.prototype.redrawControl = function(state)
{
mxCellRendererRedrawControl.apply(this, arguments);
if (state.deleteControl != null)
{
var bounds = getDeleteControlBounds(state);
var s = state.view.scale;
if (state.deleteControl.scale != s || !state.deleteControl.bounds.equals(bounds))
{
state.deleteControl.bounds = bounds;
state.deleteControl.scale = s;
state.deleteControl.redraw();
}
}
};
// Overridden to remove the control if the state is destroyed
mxCellRendererDestroy = mxCellRenderer.prototype.destroy;
mxCellRenderer.prototype.destroy = function(state)
{
mxCellRendererDestroy.apply(this, arguments);
if (state.deleteControl != null)
{
state.deleteControl.destroy();
state.deleteControl = null;
}
};
// Uncomment the following if you want the container
// to fit the size of the graph
//graph.setResizeContainer(true);
// Enables rubberband selection
new mxRubberband(graph);
// 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);
var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
var e1 = graph.insertEdge(parent, null, '', v1, v2);
}
finally
{
// Updates the display
graph.getModel().endUpdate();
}
graph.centerZoom = false;
document.body.appendChild(mxUtils.button('Zoom In', function()
{
graph.zoomIn();
}));
document.body.appendChild(mxUtils.button('Zoom Out', function()
{
graph.zoomOut();
}));
}
};
</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:621px;height:441px;background:url('editors/images/grid.gif');cursor:default;">
</div>
</body>
</html>