js画图开发库--mxgraph--[secondlabel-子标签.html]

最新推荐文章于 2023-05-15 17:42:11 发布

原创最新推荐文章于 2023-05-15 17:42:11 发布 · 305 阅读

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#js画图开发库 #mxgraph #secondlabel #子标签

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本文介绍了一个使用mxGraph库实现的自定义图形标签显示方法。通过修改图形库的默认行为，可以为每个图形元素添加额外的标签信息，如元素ID等，并控制这些信息的可见性。此外，还展示了如何创建包含子元素的图形节点，并提供了切换子元素和标签可见性的功能。

<!Doctype html>
<html xmlns=http://www.w3.org/1999/xhtml>
	<head>
	<meta http-equiv=Content-Type content="text/html;charset=utf-8">
	<title>子标签</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">
		// 程序启动方法
		function main(container)
		{
			// 浏览器兼容检测
			if (!mxClient.isBrowserSupported())
			{
				mxUtils.error('Browser is not supported!', 200, false);
			}
			else
			{
				// 在图形中创建容器
				var graph = new mxGraph(container);

				// 禁止折叠图标
				graph.isCellFoldable = function(cell)
				{
					return false;
				}

				var secondLabelVisible = true;

				// 返回对于一个给定单元格的编号
				graph.getSecondLabel = function(cell)
				{
					if (!this.model.isEdge(cell))
					{
						// 可能返回一个字符串
						return "ID="+cell.id;
					}

					return null;
				};

				var relativeChildVerticesVisible = true;

				// 隐藏相对于子元素的顶点
				graph.isCellVisible = function(cell)
				{
					return !this.model.isVertex(cell) || cell.geometry == null ||
						!cell.geometry.relative ||
						cell.geometry.relative == relativeChildVerticesVisible;
				};

				// 在图形中根据模型编号创建模型
				var createShape = graph.cellRenderer.createShape;
				graph.cellRenderer.createShape = function(state)
				{
					createShape.apply(this, arguments);

					if (secondLabelVisible &&
						!state.cell.geometry.relative)
					{
						var secondLabel = graph.getSecondLabel(state.cell);
	
						if (secondLabel != null && state.shape != null && state.secondLabel == null)
						{
							state.secondLabel = new mxText(secondLabel, new mxRectangle(),
									mxConstants.ALIGN_LEFT, mxConstants.ALIGN_BOTTOM);

							// 标签的样式
							state.secondLabel.color = 'black';
							state.secondLabel.family = 'Verdana';
							state.secondLabel.size = 8;
							state.secondLabel.fontStyle = mxConstants.FONT_ITALIC;
							state.secondLabel.background = 'yellow';
							state.secondLabel.border = 'black';

							state.secondLabel.dialect = state.shape.dialect;
							state.secondLabel.init(state.view.getDrawPane());
						}
					}
				};

				// 移动/调整大小已被重新绘制的元素
				var redraw = graph.cellRenderer.redraw;
				graph.cellRenderer.redraw = function(state)
				{
					redraw.apply(this, arguments);
					
					if (state.shape != null && state.secondLabel != null)
					{
						var scale = graph.getView().getScale();
						var bounds = new mxRectangle(state.x + state.width - 8 * scale, state.y + 8 * scale, 0, 0);
						state.secondLabel.value = graph.getSecondLabel(state.cell);
						state.secondLabel.scale = scale;
						state.secondLabel.bounds = bounds;
						state.secondLabel.redraw();
					}
				};

				// 销毁图形编号
				var destroy = graph.cellRenderer.destroy;
				graph.cellRenderer.destroy = function(state)
				{
					destroy.apply(this, arguments);
					
					if (state.secondLabel != null)
					{
						state.secondLabel.destroy();
						state.secondLabel = null;
					}
				};
				
				// 创建默认窗口
				var parent = graph.getDefaultParent();
								
				// 开启更新事务
				graph.getModel().beginUpdate();
				try
				{
					var v1 = graph.insertVertex(parent, null, 'Hello,', 30, 20, 80, 30);
					// 创建子元素
					var v11 = graph.insertVertex(v1, null, 'World', 1, 1, 0, 0, 'align=left;verticalAlign=top;labelBackgroundColor=red;labelBorderColor=black', true);
					v11.geometry.offset = new mxPoint(-8, -8);
					var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
					// 创建子元素
					var v21 = graph.insertVertex(v2, null, 'World', 1, 1, 0, 0, 'align=left;verticalAlign=top;fillColor=red;rounded=1;spacingLeft=4;spacingRight=4', true);
					v21.geometry.offset = new mxPoint(-8, -8);
					graph.updateCellSize(v21);
					var e1 = graph.insertEdge(parent, null, '', v1, v2);
				}
				finally
				{
					// 结束更新事务
					graph.getModel().endUpdate();
				}

				// 添加切换子元素按钮
				document.body.insertBefore(mxUtils.button('切换到子元素Toggle Child Vertices',
					function(evt)
					{
						relativeChildVerticesVisible = !relativeChildVerticesVisible;
						graph.refresh();
					}
				), document.body.firstChild);
				
				// 添加切换编号按钮
				document.body.insertBefore(mxUtils.button('切换到编号Toggle IDs',
					function(evt)
					{
						secondLabelVisible = !secondLabelVisible;
						graph.refresh();
					}
				), document.body.firstChild);
			}
		};
	</script>
</head>

<!-- 页面载入时启动程序 -->
<body onload="main(document.getElementById('graphContainer'))">

	<!-- 创建一个带网格壁纸的容器 -->
	<div id="graphContainer"
		style="overflow:hidden;width:321px;height:241px;background:url('editors/images/grid.gif')">
	</div>
</body>
</html>