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Group相关问题-组内节点限制移动范围

news 2025/7/22 18:25:31

1.在节点中定义dragComputation,限制节点的移动范围

注意事项

组节点不定义go.Placeholder ,设置了占位符后组内节点移动将改变组节点位置
dragComputation中自定义stayInGroup计算规则是根据groupNode的resizeObject计算
如果开启了resizable:true,建议指定其改变大的零部件resizeObjectName: “PH”,

<!DOCTYPE html>
<html><head lang="en"><meta charset="UTF-8"><title></title><style type="text/css">canvas {border: 0px;outline: none;}</style><script src="js/go-2.0.11.js"></script><script src="js/jquery-1.12.4.min.js"></script><script type="text/javascript">$(function() {gojsInit();});function gojsInit() {var $ = go.GraphObject.make; // for conciseness in defining templatesdiagram =$(go.Diagram, "myDiagram", // must name or refer to the DIV HTML element{initialContentAlignment: go.Spot.Center, //初始位置initialScale: 1.5, //初始比例});diagram.nodeTemplate =$(go.Node, {dragComputation: stayInGroup},new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),$(go.TextBlock,new go.Binding("text", "key")));diagram.groupTemplate =$(go.Group, "Vertical", {selectionObjectName: "PH",locationObjectName: "PH",resizeObjectName: "PH",resizable:true},new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),$(go.TextBlock, // group title{font: "Bold 12pt Sans-Serif"},new go.Binding("text", "key")),$(go.Shape, // using a Shape instead of a Placeholder{name: "PH",fill: "lightyellow"},new go.Binding("desiredSize", "size", go.Size.parse)));var nodeDataArray = [{key: "Alpha",loc: "0 0"},{key: "Beta",group: "Omega",loc: "75 75"},{key: "Gamma",group: "Omega",loc: "125 75"},{key: "Omega",isGroup: true,loc: "50 50",size: "150 50"},{key: "Delta",loc: "200 0"}];var linkDataArray = [{from: "Alpha",to: "Beta"}, // from outside the Group to inside it{from: "Beta",to: "Gamma"}, // this link is a member of the Group{from: "Omega",to: "Delta"} // from the Group to a Node];diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);function stayInGroup(part, pt, gridpt) {// 获取节点所在组const grp = part.containingGroup;if(grp === null) return pt;// 获取组节点访问const back = grp.resizeObject;if(back === null) return pt;// 如果按下Shift键，则允许将节点拖出组if(part.diagram.lastInput.shift) return pt;const r = back.getDocumentBounds();const b = part.actualBounds;const loc = part.location;// 限制节点移动范围const x = Math.max(r.x, Math.min(pt.x, r.right - b.width - 1)) + (loc.x - b.x);const y = Math.max(r.y, Math.min(pt.y, r.bottom - b.height - 1)) + (loc.y - b.y);return new go.Point(x, y);}}function save() {document.getElementById("mySavedModel").value = diagram.model.toJson();diagram.isModified = false;}function load() {diagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);}</script></head><body><div id="sample"><div style="width:100%; white-space:nowrap;"><span style="display: inline-block; vertical-align: top; padding: 5px; width:95%"><div  id="myDiagram" style="border: solid 1px gray; height: 400px"></div><button id="saveModel" onclick="save()">Save</button><button id="loadModel" onclick="load()">Load</button></span></div><textarea id="mySavedModel" style="width:100%;height:300px"></textarea></div></body></html>