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static/mxgraph/examples/dragsource.html
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204
static/mxgraph/examples/dragsource.html
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<!--
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Copyright (c) 2006-2013, JGraph Ltd
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Dragsource example for mxGraph. This example demonstrates using
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one drag source for multiple graphs and changing the drag icon.
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-->
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<html>
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<head>
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<title>Dragsource example for mxGraph</title>
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<!-- Sets the basepath for the library if not in same directory -->
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<script type="text/javascript">
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mxBasePath = '../src';
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</script>
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<!-- Loads and initializes the library -->
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<script type="text/javascript" src="../src/js/mxClient.js"></script>
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<!-- Example code -->
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<script type="text/javascript">
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// Program starts here. Creates a sample graph in the
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// DOM node with the specified ID. This function is invoked
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// from the onLoad event handler of the document (see below).
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function main()
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{
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// Checks if the browser is supported
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if (!mxClient.isBrowserSupported())
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{
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// Displays an error message if the browser is not supported.
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mxUtils.error('Browser is not supported!', 200, false);
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}
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else
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{
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// Enables guides
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mxGraphHandler.prototype.guidesEnabled = true;
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// Alt disables guides
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mxGuide.prototype.isEnabledForEvent = function(evt)
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{
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return !mxEvent.isAltDown(evt);
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};
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// Enables snapping waypoints to terminals
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mxEdgeHandler.prototype.snapToTerminals = true;
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var graphs = [];
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// Creates the graph inside the given container
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for (var i = 0; i < 2; i++)
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{
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var container = document.createElement('div');
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container.style.overflow = 'hidden';
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container.style.position = 'relative';
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container.style.width = '321px';
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container.style.height = '241px';
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container.style.background = 'url(\'editors/images/grid.gif\')';
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container.style.cursor = 'default';
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document.body.appendChild(container);
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var graph = new mxGraph(container);
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graph.gridSize = 30;
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// Uncomment the following if you want the container
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// to fit the size of the graph
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//graph.setResizeContainer(true);
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// Enables rubberband selection
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new mxRubberband(graph);
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// Gets the default parent for inserting new cells. This
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// is normally the first child of the root (ie. layer 0).
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var parent = graph.getDefaultParent();
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// Adds cells to the model in a single step
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graph.getModel().beginUpdate();
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try
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{
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var v1 = graph.insertVertex(parent, null, 'Hello,', 20, 20, 80, 30);
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var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
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var e1 = graph.insertEdge(parent, null, '', v1, v2);
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}
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finally
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{
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// Updates the display
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graph.getModel().endUpdate();
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}
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graphs.push(graph);
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}
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// Returns the graph under the mouse
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var graphF = function(evt)
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{
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var x = mxEvent.getClientX(evt);
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var y = mxEvent.getClientY(evt);
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var elt = document.elementFromPoint(x, y);
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for (var i = 0; i < graphs.length; i++)
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{
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if (mxUtils.isAncestorNode(graphs[i].container, elt))
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{
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return graphs[i];
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}
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}
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return null;
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};
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// Inserts a cell at the given location
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var funct = function(graph, evt, target, x, y)
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{
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var cell = new mxCell('Test', new mxGeometry(0, 0, 120, 40));
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cell.vertex = true;
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var cells = graph.importCells([cell], x, y, target);
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if (cells != null && cells.length > 0)
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{
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graph.scrollCellToVisible(cells[0]);
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graph.setSelectionCells(cells);
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}
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};
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// Creates a DOM node that acts as the drag source
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var img = mxUtils.createImage('images/icons48/gear.png');
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img.style.width = '48px';
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img.style.height = '48px';
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document.body.appendChild(img);
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// Disables built-in DnD in IE (this is needed for cross-frame DnD, see below)
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if (mxClient.IS_IE)
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{
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mxEvent.addListener(img, 'dragstart', function(evt)
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{
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evt.returnValue = false;
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});
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}
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// Creates the element that is being for the actual preview.
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var dragElt = document.createElement('div');
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dragElt.style.border = 'dashed black 1px';
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dragElt.style.width = '120px';
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dragElt.style.height = '40px';
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// Drag source is configured to use dragElt for preview and as drag icon
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// if scalePreview (last) argument is true. Dx and dy are null to force
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// the use of the defaults. Note that dx and dy are only used for the
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// drag icon but not for the preview.
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var ds = mxUtils.makeDraggable(img, graphF, funct, dragElt, null, null, graph.autoscroll, true);
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// Redirects feature to global switch. Note that this feature should only be used
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// if the the x and y arguments are used in funct to insert the cell.
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ds.isGuidesEnabled = function()
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{
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return graph.graphHandler.guidesEnabled;
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};
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// Restores original drag icon while outside of graph
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ds.createDragElement = mxDragSource.prototype.createDragElement;
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}
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};
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// NOTE: To enable cross-document DnD (eg. between frames),
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// the following methods need to be overridden:
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/*mxDragSourceMouseUp = mxDragSource.prototype.mouseUp;
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mxDragSource.prototype.mouseUp = function(evt)
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{
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var doc = this.element.ownerDocument;
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if (doc != document)
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{
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var mu = (mxClient.IS_TOUCH) ? 'touchend' : 'mouseup';
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if (this.mouseUpHandler != null)
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{
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mxEvent.removeListener(doc, mu, this.mouseUpHandler);
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}
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}
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mxDragSourceMouseUp.apply(this, arguments);
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};*/
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/*mxDragSourceMouseDown = mxDragSource.prototype.mouseDown;
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mxDragSource.prototype.mouseDown = function(evt)
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{
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if (this.enabled && !mxEvent.isConsumed(evt))
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{
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mxDragSourceMouseDown.apply(this, arguments);
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var doc = this.element.ownerDocument;
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if (doc != document)
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{
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var mu = (mxClient.IS_TOUCH) ? 'touchend' : 'mouseup';
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mxEvent.addListener(doc, mu, this.mouseUpHandler);
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}
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}
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};*/
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</script>
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</head>
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<!-- Page passes the container for the graph to the program -->
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<body onload="main();">
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</body>
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</html>
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