180 lines
5.6 KiB
HTML
180 lines
5.6 KiB
HTML
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$Id: helloworld.html,v 1.6 2013/10/28 08:44:54 gaudenz Exp $
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Copyright (c) 2006-2013, JGraph Ltd
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Drop example for mxGraph. This example demonstrates handling
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native drag and drop of images (requires modern browser).
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-->
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<html>
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<head>
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<title>Drop 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(container)
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{
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// Checks if the browser is supported
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var fileSupport = window.File != null && window.FileReader != null && window.FileList != null;
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if (!fileSupport || !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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// Disables the built-in context menu
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mxEvent.disableContextMenu(container);
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// Creates the graph inside the given container
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var graph = new mxGraph(container);
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// Enables rubberband selection
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new mxRubberband(graph);
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mxEvent.addListener(container, 'dragover', function(evt)
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{
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if (graph.isEnabled())
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{
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evt.stopPropagation();
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evt.preventDefault();
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}
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});
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mxEvent.addListener(container, 'drop', function(evt)
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{
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if (graph.isEnabled())
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{
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evt.stopPropagation();
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evt.preventDefault();
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// Gets drop location point for vertex
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var pt = mxUtils.convertPoint(graph.container, mxEvent.getClientX(evt), mxEvent.getClientY(evt));
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var tr = graph.view.translate;
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var scale = graph.view.scale;
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var x = pt.x / scale - tr.x;
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var y = pt.y / scale - tr.y;
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// Converts local images to data urls
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var filesArray = event.dataTransfer.files;
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for (var i = 0; i < filesArray.length; i++)
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{
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handleDrop(graph, filesArray[i], x + i * 10, y + i * 10);
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}
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}
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});
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}
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};
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// Handles each file as a separate insert for simplicity.
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// Use barrier to handle multiple files as a single insert.
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function handleDrop(graph, file, x, y)
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{
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if (file.type.substring(0, 5) == 'image')
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{
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var reader = new FileReader();
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reader.onload = function(e)
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{
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// Gets size of image for vertex
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var data = e.target.result;
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// SVG needs special handling to add viewbox if missing and
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// find initial size from SVG attributes (only for IE11)
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if (file.type.substring(0, 9) == 'image/svg')
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{
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var comma = data.indexOf(',');
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var svgText = atob(data.substring(comma + 1));
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var root = mxUtils.parseXml(svgText);
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// Parses SVG to find width and height
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if (root != null)
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{
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var svgs = root.getElementsByTagName('svg');
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if (svgs.length > 0)
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{
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var svgRoot = svgs[0];
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var w = parseFloat(svgRoot.getAttribute('width'));
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var h = parseFloat(svgRoot.getAttribute('height'));
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// Check if viewBox attribute already exists
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var vb = svgRoot.getAttribute('viewBox');
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if (vb == null || vb.length == 0)
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{
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svgRoot.setAttribute('viewBox', '0 0 ' + w + ' ' + h);
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}
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// Uses width and height from viewbox for
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// missing width and height attributes
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else if (isNaN(w) || isNaN(h))
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{
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var tokens = vb.split(' ');
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if (tokens.length > 3)
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{
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w = parseFloat(tokens[2]);
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h = parseFloat(tokens[3]);
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}
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}
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w = Math.max(1, Math.round(w));
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h = Math.max(1, Math.round(h));
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data = 'data:image/svg+xml,' + btoa(mxUtils.getXml(svgs[0], '\n'));
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graph.insertVertex(null, null, '', x, y, w, h, 'shape=image;image=' + data + ';');
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}
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}
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}
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else
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{
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var img = new Image();
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img.onload = function()
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{
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var w = Math.max(1, img.width);
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var h = Math.max(1, img.height);
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// Converts format of data url to cell style value for use in vertex
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var semi = data.indexOf(';');
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if (semi > 0)
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{
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data = data.substring(0, semi) + data.substring(data.indexOf(',', semi + 1));
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}
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graph.insertVertex(null, null, '', x, y, w, h, 'shape=image;image=' + data + ';');
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};
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img.src = data;
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}
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};
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reader.readAsDataURL(file);
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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(document.getElementById('graphContainer'))">
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Drag & drop your images below:<br>
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<!-- Creates a container for the graph with a grid wallpaper -->
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<div id="graphContainer"
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style="position:relative;overflow:hidden;width:621px;height:441px;background:url('editors/images/grid.gif');cursor:default;">
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</div>
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</body>
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</html>
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