134 lines
5.0 KiB
HTML
134 lines
5.0 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>Different Criteria for Hiding "Children" of Collapsed Nodes</title>
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<meta name="description" content="Custom policy for collapsing and expanding subtrees, different than TreeExpanderButton." />
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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",
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{
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initialContentAlignment: go.Spot.Center,
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padding: 10,
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layout: $(go.LayeredDigraphLayout,
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{ direction: 90, layeringOption: go.LayeredDigraphLayout.LayerLongestPathSource }),
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"undoManager.isEnabled": true
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});
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myDiagram.nodeTemplate =
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$(go.Node, go.Panel.Vertical,
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{ portId: "", fromLinkable: true, toLinkable: true },
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$(go.Panel, go.Panel.Auto,
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$(go.Shape,
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{ fill: "white", minSize: new go.Size(30, 30), strokeWidth: 0 },
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{ cursor: "pointer" }, // indicate that linking may start here
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new go.Binding("fill", "color")),
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$(go.TextBlock,
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{ margin: 2 },
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{ fromLinkable: false, toLinkable: false }, // don't start drawing a link from the text
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new go.Binding("text", "key"))),
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$("Button", // a replacement for "TreeExpanderButton" that works for non-tree-structured graphs
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// assume initially not visible because there are no links coming out
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{ visible: false },
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// bind the button visibility to whether it's not a leaf node
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new go.Binding("visible", "isTreeLeaf",
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function(leaf) { return !leaf; })
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.ofObject(),
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$(go.Shape,
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{
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name: "ButtonIcon",
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figure: "MinusLine",
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desiredSize: new go.Size(6, 6)
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},
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new go.Binding("figure", "isCollapsed", // data.isCollapsed remembers "collapsed" or "expanded"
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function(collapsed) { return collapsed ? "PlusLine" : "MinusLine"; })),
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{
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click: function(e, obj) {
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e.diagram.startTransaction();
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var node = obj.part;
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if (node.data.isCollapsed) {
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expandFrom(node, node);
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} else {
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collapseFrom(node, node);
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}
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e.diagram.commitTransaction("toggled visibility of dependencies");
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}
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})
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);
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function collapseFrom(node, start) {
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if (node.data.isCollapsed) return;
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node.diagram.model.setDataProperty(node.data, "isCollapsed", true);
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if (node !== start) node.visible = false;
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node.findNodesOutOf().each(collapseFrom);
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}
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function expandFrom(node, start) {
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if (!node.data.isCollapsed) return;
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node.diagram.model.setDataProperty(node.data, "isCollapsed", false);
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if (node !== start) node.visible = true;
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node.findNodesOutOf().each(expandFrom);
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}
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myDiagram.linkTemplate =
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$(go.Link,
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{ relinkableFrom: true, relinkableTo: true, corner: 10 },
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$(go.Shape),
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$(go.Shape, { toArrow: "Standard" }));
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myDiagram.model = new go.GraphLinksModel([
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{ key: "A", color: "lightgreen" },
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{ key: "B1", color: "yellow" },
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{ key: "B2", color: "yellow" },
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{ key: "C", color: "lightblue" },
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{ key: "D1", color: "orange" },
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{ key: "D2", color: "orange" },
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{ key: "E", color: "pink" },
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{ key: "F", color: "lightgreen" },
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{ key: "Z1", color: "lightgreen" },
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{ key: "Z2", color: "yellow" },
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{ key: "Z3", color: "orange" },
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{ key: "Z4", color: "pink" }
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], [
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{ from: "A", to: "B1" },
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{ from: "B1", to: "C" },
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{ from: "A", to: "B2" },
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{ from: "B2", to: "D2" },
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{ from: "C", to: "D1" },
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{ from: "C", to: "D2" },
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{ from: "D1", to: "E" },
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{ from: "D2", to: "E" },
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{ from: "D2", to: "F" },
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{ from: "Z1", to: "Z2" },
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{ from: "Z2", to: "Z3" },
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{ from: "Z3", to: "Z4" },
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{ from: "Z4", to: "Z1" }
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]);
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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:600px; height:700px"></div>
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<p>
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The "TreeExpanderButton", which changes the <a>Node.isTreeExpanded</a> property, really only works with tree structures.
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When you want to hide/show the "downstream" nodes from a given node, using the "TreeExpanderButton" might not do what you like,
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especially when there are cycles in the graph structure.
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</p>
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<p>
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Instead, this sample implements a "Button" with custom behavior to modify the visibility of each Node.
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If this behavior is still not quite right for your app, you can adapt the behavior implemented in the
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<pre>collapseFrom</pre> and <pre>expandFrom</pre> functions to use different criteria for when to stop recursion.
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</p>
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</div>
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</body>
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</html>
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