javascript/examples/drop.html · opendsl/mxgraph

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mxgraph

javascript

examples

drop.html

drop.html 5.51 KB

<html>
<head>
	<title>Drop example for mxGraph</title>

<script type="text/javascript">
		mxBasePath = '../src';
	</script>

<script type="text/javascript" src="../src/js/mxClient.js"></script>

<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
			var fileSupport = window.File != null && window.FileReader != null && window.FileList != null;
			
			if (!fileSupport || !mxClient.isBrowserSupported())
			{
				// Displays an error message if the browser is not supported.
				mxUtils.error('Browser is not supported!', 200, false);
			}
			else
			{
				// Disables the built-in context menu
				mxEvent.disableContextMenu(container);
				
				// Creates the graph inside the given container
				var graph = new mxGraph(container);

// Enables rubberband selection
				new mxRubberband(graph);

mxEvent.addListener(container, 'dragover', function(evt)
				{
					if (graph.isEnabled())
					{
						evt.stopPropagation();
						evt.preventDefault();
					}
				});
				
				mxEvent.addListener(container, 'drop', function(evt)
				{
					if (graph.isEnabled())
					{
						evt.stopPropagation();
						evt.preventDefault();

// Gets drop location point for vertex
						var pt = mxUtils.convertPoint(graph.container, mxEvent.getClientX(evt), mxEvent.getClientY(evt));
						var tr = graph.view.translate;
						var scale = graph.view.scale;
						var x = pt.x / scale - tr.x;
						var y = pt.y / scale - tr.y;
						
						// Converts local images to data urls
						var filesArray = event.dataTransfer.files;
						
		 for (var i = 0; i < filesArray.length; i++)
		 {
			 			handleDrop(graph, filesArray[i], x + i * 10, y + i * 10);
		 }
					}
				});
			}
		};

// Handles each file as a separate insert for simplicity.
		// Use barrier to handle multiple files as a single insert.
		function handleDrop(graph, file, x, y)
		{
			if (file.type.substring(0, 5) == 'image')
			{
 var reader = new FileReader();

reader.onload = function(e)
 {
 	// Gets size of image for vertex
					var data = e.target.result;

// SVG needs special handling to add viewbox if missing and
 				// find initial size from SVG attributes (only for IE11)
					if (file.type.substring(0, 9) == 'image/svg')
	 			{
 					var comma = data.indexOf(',');
 					var svgText = atob(data.substring(comma + 1));
 					var root = mxUtils.parseXml(svgText);
 					
 					// Parses SVG to find width and height
 					if (root != null)
 					{
 						var svgs = root.getElementsByTagName('svg');
 						
 						if (svgs.length > 0)
	 					{
 							var svgRoot = svgs[0];
	 						var w = parseFloat(svgRoot.getAttribute('width'));
	 						var h = parseFloat(svgRoot.getAttribute('height'));
	 						
	 						// Check if viewBox attribute already exists
	 						var vb = svgRoot.getAttribute('viewBox');
	 						
	 						if (vb == null || vb.length == 0)
	 						{
	 							svgRoot.setAttribute('viewBox', '0 0 ' + w + ' ' + h);
	 						}
	 						// Uses width and height from viewbox for
	 						// missing width and height attributes
	 						else if (isNaN(w) || isNaN(h))
	 						{
	 							var tokens = vb.split(' ');
	 							
	 							if (tokens.length > 3)
	 							{
	 								w = parseFloat(tokens[2]);
	 								h = parseFloat(tokens[3]);
	 							}
	 						}
	 						
		 	w = Math.max(1, Math.round(w));
		 	h = Math.max(1, Math.round(h));
	 						
	 						data = 'data:image/svg+xml,' + btoa(mxUtils.getXml(svgs[0], '\n'));
	 						graph.insertVertex(null, null, '', x, y, w, h, 'shape=image;image=' + data + ';');
	 					}
 					}
	 			}
					else
					{
 	var img = new Image();
 	
 	img.onload = function()
 	{
	 	var w = Math.max(1, img.width);
	 	var h = Math.max(1, img.height);
	 	
	 	// Converts format of data url to cell style value for use in vertex
	 				var semi = data.indexOf(';');
	 				
	 				if (semi > 0)
	 				{
	 					data = data.substring(0, semi) + data.substring(data.indexOf(',', semi + 1));
	 				}

graph.insertVertex(null, null, '', x, y, w, h, 'shape=image;image=' + data + ';');
 	};
 	
 	img.src = data;
					}
 };
 
				reader.readAsDataURL(file);
			}
		};
	</script>
</head>

<body onload="main(document.getElementById('graphContainer'))">
	Drag & drop your images below:<br>
	
	<div id="graphContainer"
		style="position:relative;overflow:hidden;width:621px;height:441px;background:url('editors/images/grid.gif');cursor:default;">
	</div>
</body>
</html>

一键复制编辑原始数据按行查看历史

Gaudenz Alder 提交于 2014年10月03日 20:49 +08:00 . 3.1.0.0 release

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178

<!--
 Copyright (c) 2006-2013, JGraph Ltd

 Drop example for mxGraph. This example demonstrates handling
 native drag and drop of images (requires modern browser).
-->
<html>
<head>
	<title>Drop 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
			var fileSupport = window.File != null && window.FileReader != null && window.FileList != null;
			
			if (!fileSupport || !mxClient.isBrowserSupported())
			{
				// Displays an error message if the browser is not supported.
				mxUtils.error('Browser is not supported!', 200, false);
			}
			else
			{
				// Disables the built-in context menu
				mxEvent.disableContextMenu(container);
				
				// Creates the graph inside the given container
				var graph = new mxGraph(container);

				// Enables rubberband selection
				new mxRubberband(graph);

				mxEvent.addListener(container, 'dragover', function(evt)
				{
					if (graph.isEnabled())
					{
						evt.stopPropagation();
						evt.preventDefault();
					}
				});
				
				mxEvent.addListener(container, 'drop', function(evt)
				{
					if (graph.isEnabled())
					{
						evt.stopPropagation();
						evt.preventDefault();

						// Gets drop location point for vertex
						var pt = mxUtils.convertPoint(graph.container, mxEvent.getClientX(evt), mxEvent.getClientY(evt));
						var tr = graph.view.translate;
						var scale = graph.view.scale;
						var x = pt.x / scale - tr.x;
						var y = pt.y / scale - tr.y;
						
						// Converts local images to data urls
						var filesArray = event.dataTransfer.files;
						
		 for (var i = 0; i < filesArray.length; i++)
		 {
			 			handleDrop(graph, filesArray[i], x + i * 10, y + i * 10);
		 }
					}
				});
			}
		};

		// Handles each file as a separate insert for simplicity.
		// Use barrier to handle multiple files as a single insert.
		function handleDrop(graph, file, x, y)
		{
			if (file.type.substring(0, 5) == 'image')
			{
 var reader = new FileReader();

 reader.onload = function(e)
 {
 	// Gets size of image for vertex
					var data = e.target.result;

 				// SVG needs special handling to add viewbox if missing and
 				// find initial size from SVG attributes (only for IE11)
					if (file.type.substring(0, 9) == 'image/svg')
	 			{
 					var comma = data.indexOf(',');
 					var svgText = atob(data.substring(comma + 1));
 					var root = mxUtils.parseXml(svgText);
 					
 					// Parses SVG to find width and height
 					if (root != null)
 					{
 						var svgs = root.getElementsByTagName('svg');
 						
 						if (svgs.length > 0)
	 					{
 							var svgRoot = svgs[0];
	 						var w = parseFloat(svgRoot.getAttribute('width'));
	 						var h = parseFloat(svgRoot.getAttribute('height'));
	 						
	 						// Check if viewBox attribute already exists
	 						var vb = svgRoot.getAttribute('viewBox');
	 						
	 						if (vb == null || vb.length == 0)
	 						{
	 							svgRoot.setAttribute('viewBox', '0 0 ' + w + '' + h);
	 						}
	 						// Uses width and height from viewbox for
	 						// missing width and height attributes
	 						else if (isNaN(w) || isNaN(h))
	 						{
	 							var tokens = vb.split('');
	 							
	 							if (tokens.length > 3)
	 							{
	 								w = parseFloat(tokens[2]);
	 								h = parseFloat(tokens[3]);
	 							}
	 						}
	 						
		 	w = Math.max(1, Math.round(w));
		 	h = Math.max(1, Math.round(h));
	 						
	 						data = 'data:image/svg+xml,' + btoa(mxUtils.getXml(svgs[0], '\n'));
	 						graph.insertVertex(null, null, '', x, y, w, h, 'shape=image;image=' + data + ';');
	 					}
 					}
	 			}
					else
					{
 	var img = new Image();
 	
 	img.onload = function()
 	{
	 	var w = Math.max(1, img.width);
	 	var h = Math.max(1, img.height);
	 	
	 	// Converts format of data url to cell style value for use in vertex
	 				var semi = data.indexOf(';');
	 				
	 				if (semi > 0)
	 				{
	 					data = data.substring(0, semi) + data.substring(data.indexOf(',', semi + 1));
	 				}

	 				graph.insertVertex(null, null, '', x, y, w, h, 'shape=image;image=' + data + ';');
 	};
 	
 	img.src = data;
					}
 };
 
				reader.readAsDataURL(file);
			}
		};
	</script>
</head>

<!-- Page passes the container for the graph to the program -->
<body onload="main(document.getElementById('graphContainer'))">
	Drag & drop your images below:<br>
	<!-- Creates a container for the graph with a grid wallpaper -->
	<div id="graphContainer"
		style="position:relative;overflow:hidden;width:621px;height:441px;background:url('editors/images/grid.gif');cursor:default;">
	</div>
</body>
</html>