gojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
135 lines (127 loc) • 5.75 kB
HTML
<html>
<head>
<meta charset="UTF-8">
<title>Different Criteria for Hiding "Children" of Collapsed Nodes</title>
<meta name="description" content="Custom policy for collapsing and expanding subtrees, different than TreeExpanderButton." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make;
myDiagram =
$(go.Diagram, "myDiagramDiv",
{
padding: 10,
layout: $(go.LayeredDigraphLayout,
{ direction: 90, layeringOption: go.LayeredDigraphLayout.LayerLongestPathSource }),
"undoManager.isEnabled": true
});
myDiagram.nodeTemplate =
$(go.Node, go.Panel.Vertical,
{ portId: "", fromLinkable: true, toLinkable: true },
new go.Binding("visible"),
$(go.Panel, go.Panel.Auto,
$(go.Shape,
{ fill: "white", minSize: new go.Size(30, 30), strokeWidth: 0 },
{ cursor: "pointer" }, // indicate that linking may start here
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 2 },
{ fromLinkable: false, toLinkable: false }, // don't start drawing a link from the text
new go.Binding("text", "key"))),
$("Button", // a replacement for "TreeExpanderButton" that works for non-tree-structured graphs
// assume initially not visible because there are no links coming out
{ visible: false },
// bind the button visibility to whether it's not a leaf node
new go.Binding("visible", "isTreeLeaf",
function(leaf) { return !leaf; })
.ofObject(),
$(go.Shape,
{
name: "ButtonIcon",
figure: "MinusLine",
desiredSize: new go.Size(6, 6)
},
new go.Binding("figure", "isCollapsed", // data.isCollapsed remembers "collapsed" or "expanded"
function(collapsed) { return collapsed ? "PlusLine" : "MinusLine"; })),
{
click: function(e, obj) {
e.diagram.startTransaction();
var node = obj.part;
if (node.data.isCollapsed) {
expandFrom(node, node);
} else {
collapseFrom(node, node);
}
e.diagram.commitTransaction("toggled visibility of dependencies");
}
})
);
function collapseFrom(node, start) {
if (node.data.isCollapsed) return;
node.diagram.model.setDataProperty(node.data, "isCollapsed", true);
if (node !== start) node.diagram.model.setDataProperty(node.data, "visible", false);
node.findNodesOutOf().each(collapseFrom);
}
function expandFrom(node, start) {
if (!node.data.isCollapsed) return;
node.diagram.model.setDataProperty(node.data, "isCollapsed", false);
if (node !== start) node.diagram.model.setDataProperty(node.data, "visible", true);
node.findNodesOutOf().each(expandFrom);
}
myDiagram.linkTemplate =
$(go.Link,
{ relinkableFrom: true, relinkableTo: true, corner: 10 },
$(go.Shape),
$(go.Shape, { toArrow: "Standard" }));
myDiagram.model = new go.GraphLinksModel([
{ key: "A", color: "lightgreen" },
{ key: "B1", color: "yellow" },
{ key: "B2", color: "yellow" },
{ key: "C", color: "lightblue" },
{ key: "D1", color: "orange" },
{ key: "D2", color: "orange" },
{ key: "E", color: "pink" },
{ key: "F", color: "lightgreen" },
{ key: "Z1", color: "lightgreen" },
{ key: "Z2", color: "yellow" },
{ key: "Z3", color: "orange" },
{ key: "Z4", color: "pink" }
], [
{ from: "A", to: "B1" },
{ from: "B1", to: "C" },
{ from: "A", to: "B2" },
{ from: "B2", to: "D2" },
{ from: "C", to: "D1" },
{ from: "C", to: "D2" },
{ from: "D1", to: "E" },
{ from: "D2", to: "E" },
{ from: "D2", to: "F" },
{ from: "Z1", to: "Z2" },
{ from: "Z2", to: "Z3" },
{ from: "Z3", to: "Z4" },
{ from: "Z4", to: "Z1" }
]);
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width:600px; height:700px"></div>
<p>
The "TreeExpanderButton", which changes the <a>Node.isTreeExpanded</a> property, really only works with tree structures.
When you want to hide/show the "downstream" nodes from a given node, using the "TreeExpanderButton" might not do what you like,
especially when there are cycles in the graph structure.
</p>
<p>
Instead, this sample implements a "Button" with custom behavior to modify the visibility of each Node.
If this behavior is still not quite right for your app, you can adapt the behavior implemented in the
<code>collapseFrom</code> and <code>expandFrom</code> functions to use different criteria for when to stop recursion.
</p>
</div>
</body>
</html>