<!--
Copyright (c) 2006-2013, JGraph Ltd
Dragsource example for mxGraph. This example demonstrates using
one drag source for multiple graphs and changing the drag icon.
-->
<html>
<head>
<title>Dragsource 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()
{
// 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
{
// Enables guides
mxGraphHandler.prototype.guidesEnabled = true;
// Alt disables guides
mxGuide.prototype.isEnabledForEvent = function(evt)
{
return !mxEvent.isAltDown(evt);
};
// Enables snapping waypoints to terminals
mxEdgeHandler.prototype.snapToTerminals = true;
var graphs = [];
// Creates the graph inside the given container
for (var i = 0; i < 2; i++)
{
var container = document.createElement('div');
container.style.overflow = 'hidden';
container.style.position = 'relative';
container.style.width = '321px';
container.style.height = '241px';
container.style.background = 'url(\'editors/images/grid.gif\')';
container.style.cursor = 'default';
document.body.appendChild(container);
var graph = new mxGraph(container);
graph.gridSize = 30;
// 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();
}
graphs.push(graph);
}
// Returns the graph under the mouse
var graphF = function(evt)
{
var x = mxEvent.getClientX(evt);
var y = mxEvent.getClientY(evt);
var elt = document.elementFromPoint(x, y);
for (var i = 0; i < graphs.length; i++)
{
if (mxUtils.isAncestorNode(graphs[i].container, elt))
{
return graphs[i];
}
}
return null;
};
// Inserts a cell at the given location
var funct = function(graph, evt, target, x, y)
{
var cell = new mxCell('Test', new mxGeometry(0, 0, 120, 40));
cell.vertex = true;
var cells = graph.importCells([cell], x, y, target);
if (cells != null && cells.length > 0)
{
graph.scrollCellToVisible(cells[0]);
graph.setSelectionCells(cells);
}
};
// Creates a DOM node that acts as the drag source
var img = mxUtils.createImage('images/icons48/gear.png');
img.style.width = '48px';
img.style.height = '48px';
document.body.appendChild(img);
// Disables built-in DnD in IE (this is needed for cross-frame DnD, see below)
if (mxClient.IS_IE)
{
mxEvent.addListener(img, 'dragstart', function(evt)
{
evt.returnValue = false;
});
}
// Creates the element that is being for the actual preview.
var dragElt = document.createElement('div');
dragElt.style.border = 'dashed black 1px';
dragElt.style.width = '120px';
dragElt.style.height = '40px';
// Drag source is configured to use dragElt for preview and as drag icon
// if scalePreview (last) argument is true. Dx and dy are null to force
// the use of the defaults. Note that dx and dy are only used for the
// drag icon but not for the preview.
var ds = mxUtils.makeDraggable(img, graphF, funct, dragElt, null, null, graph.autoscroll, true);
// Redirects feature to global switch. Note that this feature should only be used
// if the the x and y arguments are used in funct to insert the cell.
ds.isGuidesEnabled = function()
{
return graph.graphHandler.guidesEnabled;
};
// Restores original drag icon while outside of graph
ds.createDragElement = mxDragSource.prototype.createDragElement;
}
};
// NOTE: To enable cross-document DnD (eg. between frames),
// the following methods need to be overridden:
/*mxDragSourceMouseUp = mxDragSource.prototype.mouseUp;
mxDragSource.prototype.mouseUp = function(evt)
{
var doc = this.element.ownerDocument;
if (doc != document)
{
var mu = (mxClient.IS_TOUCH) ? 'touchend' : 'mouseup';
if (this.mouseUpHandler != null)
{
mxEvent.removeListener(doc, mu, this.mouseUpHandler);
}
}
mxDragSourceMouseUp.apply(this, arguments);
};*/
/*mxDragSourceMouseDown = mxDragSource.prototype.mouseDown;
mxDragSource.prototype.mouseDown = function(evt)
{
if (this.enabled && !mxEvent.isConsumed(evt))
{
mxDragSourceMouseDown.apply(this, arguments);
var doc = this.element.ownerDocument;
if (doc != document)
{
var mu = (mxClient.IS_TOUCH) ? 'touchend' : 'mouseup';
mxEvent.addListener(doc, mu, this.mouseUpHandler);
}
}
};*/
</script>
</head>
<!-- Page passes the container for the graph to the program -->
<body onload="main();">
</body>
</html>