161 lines
6.7 KiB
HTML
161 lines
6.7 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Links to Links</title>
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<meta name="description" content="Links can connect with Links by using label Nodes on Links." />
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<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
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<meta charset="UTF-8">
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<script src="../release/go.js"></script>
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<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
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<script id="code">
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function init() {
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if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
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var $ = go.GraphObject.make;
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myDiagram =
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$(go.Diagram, "myDiagramDiv", // create a Diagram for the DIV HTML element
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{
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initialContentAlignment: go.Spot.Center,
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"LinkDrawn": maybeChangeLinkCategory, // these two DiagramEvents call a
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"LinkRelinked": maybeChangeLinkCategory, // function that is defined below
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"undoManager.isEnabled": true
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});
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// when the document is modified, add a "*" to the title and enable the "Save" button
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myDiagram.addDiagramListener("Modified", function(e) {
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var button = document.getElementById("SaveButton");
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if (button) button.disabled = !myDiagram.isModified;
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var idx = document.title.indexOf("*");
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if (myDiagram.isModified) {
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if (idx < 0) document.title += "*";
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} else {
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if (idx >= 0) document.title = document.title.substr(0, idx);
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}
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});
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// the regular node template, which supports user-drawn links from the main Shape
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myDiagram.nodeTemplate =
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$("Node", "Auto",
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{ locationSpot: go.Spot.Center,
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layerName: "Background" }, // always have regular nodes behind Links
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new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
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$("Shape", "RoundedRectangle",
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{ fill: "white", stroke: null,
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portId: "", fromLinkable: true, toLinkable: true, cursor: "pointer" },
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new go.Binding("fill", "color")),
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$("TextBlock",
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{ margin: 8 }, // make some extra space for the shape around the text
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new go.Binding("text", "key")) // the label shows the node data's key
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);
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// This is the template for a label node on a link: just an Ellipse.
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// This node supports user-drawn links to and from the label node.
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myDiagram.nodeTemplateMap.add("LinkLabel",
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$("Node",
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{ selectable: false, avoidable: false,
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layerName: "Foreground" }, // always have link label nodes in front of Links
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$("Shape", "Ellipse",
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{ width: 5, height: 5, stroke: null,
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portId: "", fromLinkable: true, toLinkable: true, cursor: "pointer" })
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));
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// the regular link template, a straight blue arrow
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myDiagram.linkTemplate =
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$("Link",
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{ relinkableFrom: true, relinkableTo: true, toShortLength: 2 },
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$("Shape", { stroke: "#2E68CC", strokeWidth: 2 }),
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$("Shape", { fill: "#2E68CC", stroke: null, toArrow: "Standard" })
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);
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// This template shows links connecting with label nodes as green and arrow-less.
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myDiagram.linkTemplateMap.add("linkToLink",
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$("Link",
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{ relinkableFrom: true, relinkableTo: true },
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$("Shape", { stroke: "#2D9945", strokeWidth: 2 })
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));
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// GraphLinksModel support for link label nodes requires specifying two properties.
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myDiagram.model =
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$(go.GraphLinksModel,
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{ linkLabelKeysProperty: "labelKeys" });
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// Whenever a new Link is drawng by the LinkingTool, it also adds a node data object
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// that acts as the label node for the link, to allow links to be drawn to/from the link.
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myDiagram.toolManager.linkingTool.archetypeLabelNodeData =
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{ category: "LinkLabel" };
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// this DiagramEvent handler is called during the linking or relinking transactions
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function maybeChangeLinkCategory(e) {
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var link = e.subject;
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var linktolink = (link.fromNode.isLinkLabel || link.toNode.isLinkLabel);
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e.diagram.model.setCategoryForLinkData(link.data, (linktolink ? "linkToLink" : ""));
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}
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load();
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}
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// Show the diagram's model in JSON format
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function save() {
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document.getElementById("mySavedModel").value = myDiagram.model.toJson();
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myDiagram.isModified = false;
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}
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function load() {
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myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
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}
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</script>
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</head>
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<body onload="init()">
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<div id="sample">
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<div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:400px;"></div>
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<p>
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This demonstrates the ability for a <a>Link</a> to appear to connect with another Link.
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Regular links are blue. Link-connecting links are green.
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Try moving a node around to see how the links adapt.
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Initially the "Alpha" node connects with the link between Gamma and Delta.
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There is also a link between the two horizontal links.
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</p>
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<p>
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This effect is achieved by using "label nodes" that belong to links.
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Such "label nodes" are real <a>Node</a>s that are referenced from their owning <a>Link</a>.
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This sample customizes the "Link Label" Node template to allow the user to draw new links to/from such label nodes.
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</p>
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<p>
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Newly drawn links automatically get a label node by the <a>LinkingTool</a> because this sample initializes
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the <a>LinkingTool.archetypeLabelNodeData</a> property of the <a>ToolManager.linkingTool</a>.
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The category (i.e. template) of each link is determined by what kinds of nodes the link is connected with.
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</p>
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<div>
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<div>
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<button id="SaveButton" onclick="save()">Save</button>
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<button onclick="load()">Load</button>
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Diagram.model saved in JSON format:<br />
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</div>
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<textarea id="mySavedModel" style="width:100%;height:400px">
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{ "class": "go.GraphLinksModel",
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"linkLabelKeysProperty": "labelKeys",
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"nodeDataArray": [
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{"key":"Alpha", "color":"lightblue", "loc":"29 14"},
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{"key":"Beta", "color":"orange", "loc":"129 14"},
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{"key":"Gamma", "color":"lightgreen", "loc":"29 106"},
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{"key":"Delta", "color":"pink", "loc":"129 106"},
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{"key":"A-B", "category":"LinkLabel" },
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{"key":"G-D", "category":"LinkLabel" },
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{"key":"A-G", "category":"LinkLabel" },
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{"key":"A-G-D", "category":"LinkLabel" },
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{"key":"A-B-G-D", "category":"LinkLabel" }
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],
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"linkDataArray": [
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{"from":"Alpha", "to":"Beta", "labelKeys":[ "A-B" ]},
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{"from":"Gamma", "to":"Delta", "labelKeys":[ "G-D" ]},
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{"from":"Alpha", "to":"Gamma", "labelKeys":[ "A-G" ]},
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{"from":"Alpha", "to":"G-D", "labelKeys":[ "A-G-D" ], "category":"linkToLink"},
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{"from":"A-B", "to":"G-D", "labelKeys":[ "A-B-G-D" ], "category":"linkToLink"}
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]}
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</textarea>
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</div>
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</div>
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</body>
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</html>
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