js画图开发库--mxgraph--[userobject-对象描述.html]

最新推荐文章于 2024-05-09 03:43:26 发布
iteye_17920
最新推荐文章于 2024-05-09 03:43:26 发布
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分类专栏： mxgraph 文章标签： js画图开发库 mxgraph userobject 对象描述
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本文介绍如何利用mxgraph JavaScript库进行图形绘制，重点讲解userobject对象的描述和应用，帮助开发者理解并创建自定义图形元素。
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js画图开发库--mxgraph--[userobject-对象描述.html]
<!Doctype html>
<html xmlns=http://www.w3.org/1999/xhtml>
	<head>
	<meta http-equiv=Content-Type content="text/html;charset=utf-8">
	<title>对象描述</title>

	<!-- 如果本文件的包与src不是在同一个目录,就要将basepath设置到src目录下 -->
	<script type="text/javascript">
		mxBasePath = '../src';
	</script>

	<!-- 引入支持库文件 -->
	<script type="text/javascript" src="../src/js/mxClient.js"></script>
	
	<!-- 示例代码 -->
	<script type="text/javascript">
		//  程序在此方法中启动 
		function main(container)
		{
			// 检测浏览器兼容性
			if (!mxClient.isBrowserSupported())
			{
				mxUtils.error('Browser is not supported!', 200, false);
			}
			else
			{
				// 请注意，这些XML节点将被封装在输出中的元素模型中
				var doc = mxUtils.createXmlDocument();

				var person1 = doc.createElement('Person');
				person1.setAttribute('firstName', 'Daffy');
				person1.setAttribute('lastName', 'Duck');

				var person2 = doc.createElement('Person');
				person2.setAttribute('firstName', 'Bugs');
				person2.setAttribute('lastName', 'Bunny');

				var relation = doc.createElement('Knows');
				relation.setAttribute('since', '1985');
				
				// 在容器中创建图形
				var graph = new mxGraph(container);

				// 禁用调整大小
				graph.setCellsResizable(false);
				
				// 配置图形中调整、添加
				graph.setResizeContainer(true);
				graph.minimumContainerSize = new mxRectangle(0, 0, 500, 380);
				graph.setBorder(60);
				
				// 按下Tab 和 回车键 停止编辑 
				new mxKeyHandler(graph);

				// 禁止边框编辑
				graph.isCellEditable = function(cell)
				{
					return !this.getModel().isEdge(cell);
				};
				
				// 提供一个在显示屏上的单元格标签
				graph.convertValueToString = function(cell)
				{
					if (mxUtils.isNode(cell.value))
					{
						if (cell.value.nodeName.toLowerCase() == ('person'))
						{
							var firstName = cell.getAttribute('firstName', '');
							var lastName = cell.getAttribute('lastName', '');

							if (lastName != null && lastName.length > 0)
							{
								return lastName + ', ' + firstName;
							}

							return firstName;
						}
						else if (cell.value.nodeName.toLowerCase() == 'knows')
						{
							return cell.value.nodeName + ' (Since '
									+  cell.getAttribute('since', '') + ')';
						}

					}

					return '';
				};

				// 存储在模型中的单元格标签
				var cellLabelChanged = graph.cellLabelChanged;
				graph.cellLabelChanged = function(cell, newValue, autoSize)
				{
					if (mxUtils.isNode(cell.value) &&
						cell.value.nodeName.toLowerCase() == ('person'))
					{
						var pos = newValue.indexOf(' ');

						var firstName = (pos > 0) ? newValue.substring(0,
								pos) : newValue;
						var lastName = (pos > 0) ? newValue.substring(
								pos + 1, newValue.length) : '';

						// Clones the value for correct undo/redo
						var elt = cell.value.cloneNode(true);

						elt.setAttribute('firstName', firstName);
						elt.setAttribute('lastName', lastName);

						newValue = elt;
						autoSize = true;
					}
					
					cellLabelChanged.apply(this, arguments);
				};

				// 显示编辑值
				var getEditingValue = graph.getEditingValue;
				graph.getEditingValue = function(cell)
				{
					if (mxUtils.isNode(cell.value) &&
						cell.value.nodeName.toLowerCase() == ('person'))
					{
						var firstName = cell.getAttribute('firstName', '');
						var lastName = cell.getAttribute('lastName', '');

						return firstName + ' ' + lastName;
					}
				};

				// 在边框上显示提示工具 
				graph.setTooltips(true);
				
				var getTooltipForCell = graph.getTooltipForCell;
				graph.getTooltipForCell = function(cell)
				{
					// 在边框上显示元素详情
					if (graph.getModel().isEdge(cell))
					{
						var src = this.getLabel(this.getModel().getTerminal(cell, true));
						var trg = this.getLabel(this.getModel().getTerminal(cell, false));

						return src + ' ' + cell.value.nodeName + ' ' +  trg;
					}

					return getTooltipForCell.apply(this, arguments);
				};
				
				// 启用浏览器默认菜单
				new mxRubberband(graph);

				// 添加了一个'显示XML=View XML'选项，以查看XML的图形
				document.body.appendChild(mxUtils.button('显示XML=View XML', function()
				{
					var encoder = new mxCodec();
					var node = encoder.encode(graph.getModel());
					mxUtils.popup(mxUtils.getPrettyXml(node), true);
				}));

				// 根据元素标记改变元素内容
				var style = graph.getStylesheet().getDefaultVertexStyle();
				style[mxConstants.STYLE_STROKECOLOR] = 'gray';
				style[mxConstants.STYLE_ROUNDED] = true;
				style[mxConstants.STYLE_SHADOW] = true;
				style[mxConstants.STYLE_FILLCOLOR] = '#DFDFDF';
				style[mxConstants.STYLE_GRADIENTCOLOR] = 'white';
				style[mxConstants.STYLE_FONTCOLOR] = 'black';
				style[mxConstants.STYLE_FONTSIZE] = '12';
				style[mxConstants.STYLE_SPACING] = 4;
		
				// 修改连接线默认样式
				style = graph.getStylesheet().getDefaultEdgeStyle();
				style[mxConstants.STYLE_STROKECOLOR] = '#0C0C0C';
				style[mxConstants.STYLE_LABEL_BACKGROUNDCOLOR] = 'white';
				style[mxConstants.STYLE_EDGE] = mxEdgeStyle.ElbowConnector;
				style[mxConstants.STYLE_ROUNDED] = true;
				style[mxConstants.STYLE_FONTCOLOR] = 'black';
				style[mxConstants.STYLE_FONTSIZE] = '10';
				
				// 创建默认窗体
				var parent = graph.getDefaultParent();
								
				// 开启更新事务
				graph.getModel().beginUpdate();
				try
				{
					var v1 = graph.insertVertex(parent, null, person1, 40, 40, 80, 30);
					var v2 = graph.insertVertex(parent, null, person2, 200, 150, 80, 30);
					var e1 = graph.insertEdge(parent, null, relation, v1, v2);
				}
				finally
				{
					// 结束更新事务
					graph.getModel().endUpdate();
				}

				// 实现属性面板
				graph.getSelectionModel().addListener(mxEvent.CHANGE, function(sender, evt)
				{
					selectionChanged(graph);
				});

				selectionChanged(graph);
			}

			/**
			 * 更新属性面板
			 */
			function selectionChanged(graph)
			{
				var div = document.getElementById('properties');

				// 在IE中使用焦点选中 
				graph.container.focus();

				// 取出DIV中的内容
				div.innerHTML = '';

				// 获取被选择的 元素
				var cell = graph.getSelectionCell();

				if (cell == null)
				{
					mxUtils.writeln(div, 'Nothing selected.');
				}
				else
				{
					// 写标题
					var center = document.createElement('center');
					mxUtils.writeln(center, cell.value.nodeName + ' (' + cell.id + ')');
					div.appendChild(center);
					mxUtils.br(div);

					// 创建的用户对象的属性
					var form = new mxForm();
	
					var attrs = cell.value.attributes;
					
					for (var i = 0; i < attrs.length; i++)
					{
						createTextField(graph, form, cell, attrs[i]);
					}
	
					div.appendChild(form.getTable());
					mxUtils.br(div);
				}
			}

			/**
			 * 给定的属性创建文本字段。
			 */
			function createTextField(graph, form, cell, attribute)
			{
				var input = form.addText(attribute.nodeName + ':', attribute.nodeValue);

				var applyHandler = function()
				{
					var newValue = input.value || '';
					var oldValue = cell.getAttribute(attribute.nodeName, '');

					if (newValue != oldValue)
					{
						graph.getModel().beginUpdate();
                        
                        try
                        {
                        	var edit = new mxCellAttributeChange(
 		                           cell, attribute.nodeName,
 		                           newValue);
                           	graph.getModel().execute(edit);
                           	graph.updateCellSize(cell);
                        }
                        finally
                        {
                            graph.getModel().endUpdate();
                        }
					}
				}; 

				mxEvent.addListener(input, 'keypress', function (evt)
				{
					//需要考虑转变为文本区域
					if (evt.keyCode == /*enter*/13 &&
						!mxEvent.isShiftDown(evt))
					{
						input.blur();
					}
				});

				if (mxClient.IS_IE)
				{
					mxEvent.addListener(input, 'focusout', applyHandler);
				}
				else
				{
					// Note: Known problem is the blurring of fields in
					// Firefox by changing the selection, in which case
					// no event is fired in FF and the change is lost.
					// As a workaround you should use a local variable
					// that stores the focused field and invoke blur
					// explicitely where we do the graph.focus above.
					// 在Firefox中会出现某些不兼容，需要进行处理
					mxEvent.addListener(input, 'blur', applyHandler);
				}
			}
		};
	</script>
</head>

<!-- 页面载入后启动程序. -->
<body οnlοad="main(document.getElementById('graphContainer'))">
	<table style="position:relative;">
	<tr>
		<td>
			<div id="graphContainer"
				style="border: solid 1px black;overflow:hidden;width:321px;height:241px;cursor:default;">
			</div>
		</td>
		<td valign="top">
			<div id="properties"
				style="border: solid 1px black; padding: 10px;">
			</div>
		</td>
	</tr>
	</table>
</body>
</html>