340 lines
13 KiB
HTML
340 lines
13 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>Virtualized Tree with custom layout</title>
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<meta name="description" content="An example of virtualization where a very simple tree layout sets the bounds for each node data." />
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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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// this controls whether the tree grows deeper towards the right or downwards:
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var HORIZONTAL = true;
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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; // for conciseness in defining templates
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// The Diagram just shows what should be visible in the viewport.
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// Its model does NOT include node data for the whole graph, but only that
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// which might be visible in the viewport.
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myDiagram =
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$(go.Diagram, "myDiagramDiv",
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{
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contentAlignment: go.Spot.Center,
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initialDocumentSpot: go.Spot.Center,
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initialViewportSpot: go.Spot.Center,
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// Do manual layout in the layoutTree function below, rather than automatic layout using a
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// TreeLayout which would require the Nodes and Links to exist first for an accurate layout.
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//layout: $(go.TreeLayout,
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// { nodeSpacing: 4, compaction: go.TreeLayout.CompactionNone }),
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// Assume there's no Layout -- all data.bounds are calculated in layoutTree
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layout: $(go.Layout, { isInitial: false, isOngoing: false }), // never invalidates
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// Define the template for Nodes, used by virtualization.
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nodeTemplate:
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$(go.Node, "Auto",
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{ isLayoutPositioned: false }, // optimization
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new go.Binding("position", "bounds", function(b) { return b.position; })
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.makeTwoWay(function(p, d) { d.bounds.position = p; return d.bounds; }),
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{ width: 70, height: 20 }, // in cooperation with the load function, below
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$(go.Shape, "Rectangle",
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new go.Binding("fill", "color")),
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$(go.TextBlock,
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{ margin: 2 },
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new go.Binding("text", "color")),
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{
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toolTip:
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$(go.Adornment, "Auto",
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$(go.Shape, { fill: "lightyellow" }),
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$(go.TextBlock, { margin: 3 },
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new go.Binding("text", "",
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function(d) { return "key: " + d.key + "\nbounds: " + d.bounds.toString(); }))
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)
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}
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),
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// Define the template for Links
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linkTemplate:
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$(go.Link,
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{
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isLayoutPositioned: false, // optimization
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fromSpot: (HORIZONTAL ? go.Spot.Right : go.Spot.Bottom),
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toSpot: (HORIZONTAL ? go.Spot.Left : go.Spot.Top)
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},
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$(go.Shape)
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),
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"animationManager.isEnabled": false
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});
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// This model includes all of the data
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myWholeModel =
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$(go.TreeModel); // must match the TreeModel used by the Diagram, below
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// Do not set myDiagram.model = myWholeModel -- that would create a zillion Nodes and Links!
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// In the future Diagram may have built-in support for virtualization.
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// For now, we have to implement virtualization ourselves by having the Diagram's model
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// be different than the "real" model.
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myDiagram.model = // this only holds nodes that should be in the viewport
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$(go.TreeModel); // must match the model, above
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// for now, we have to implement virtualization ourselves
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myDiagram.isVirtualized = true;
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myDiagram.addDiagramListener("ViewportBoundsChanged", onViewportChanged);
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// This is a status message
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myLoading =
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$(go.Part, // this has to set the location or position explicitly
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{ location: new go.Point(0, 0) },
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$(go.TextBlock, "loading...",
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{ stroke: "red", font: "20pt sans-serif" }));
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// temporarily add the status indicator
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myDiagram.add(myLoading);
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// Allow the myLoading indicator to be shown now,
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// but allow objects added in load to also be considered part of the initial Diagram.
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// If you are not going to add temporary initial Parts, don't call delayInitialization.
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myDiagram.delayInitialization(load);
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}
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function load() {
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// create a lot of data for the myWholeModel
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var total = 123456;
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var treedata = [];
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for (var i = 0; i < total; i++) {
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var d = {
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key: i, // this node data's key
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color: go.Brush.randomColor(), // the node's color
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parent: (i > 0 ? Math.floor(Math.random() * i / 2) : undefined) // the random parent's key
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};
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//!!!???@@@ this needs to be customized to account for your chosen Node template
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d.bounds = new go.Rect(0, 0, 70, 20);
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treedata.push(d);
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}
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myWholeModel.nodeDataArray = treedata;
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// make it faster to get from a model parent data object to all of the children data
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improveNavigation(myWholeModel);
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// this sets the data.bounds on each node data
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// and Diagram.fixedBounds on the diagram, so the diagram knows how far it can scroll
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layoutTree(myWholeModel);
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// remove the status indicator
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myDiagram.remove(myLoading);
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}
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// this adds ._parent and ._children properties on each node data
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function improveNavigation(model) { // this must be a TreeModel
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var ndata = model.nodeDataArray;
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// create an Array of child data references for each parent data
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for (var i = 0; i < ndata.length; i++) {
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var child = ndata[i];
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var parentkey = model.getParentKeyForNodeData(child);
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var parent = model.findNodeDataForKey(parentkey);
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if (parent) {
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child._parent = parent;
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var childarr = parent._children;
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if (childarr) {
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childarr.push(child);
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} else {
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parent._children = [child];
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}
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}
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}
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}
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// The following functions implement virtualization of the Diagram
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// Assume data.bounds is a Rect of the area occupied by the Node in document coordinates.
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// The normal mechanism for determining the size of the document depends on all of the
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// Nodes and Links existing, so we need to use a function that depends only on the model data.
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function computeDocumentBounds(model) {
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var b = new go.Rect();
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var ndata = model.nodeDataArray;
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for (var i = 0; i < ndata.length; i++) {
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var d = ndata[i];
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if (!d.bounds) continue;
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if (i === 0) {
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b.set(d.bounds);
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} else {
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b.unionRect(d.bounds);
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}
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}
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return b;
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}
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// As the user scrolls or zooms, make sure the Parts (Nodes and Links) exist in the viewport.
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function onViewportChanged(e) {
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var diagram = e.diagram;
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// make sure there are Nodes for each node data that is in the viewport
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// or that is connected to such a Node
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var viewb = diagram.viewportBounds; // the new viewportBounds
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var model = diagram.model;
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var oldskips = diagram.skipsUndoManager;
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diagram.skipsUndoManager = true;
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var b = new go.Rect();
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var ndata = myWholeModel.nodeDataArray;
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for (var i = 0; i < ndata.length; i++) {
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var n = ndata[i];
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if (!n.bounds) continue;
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if (n.bounds.intersectsRect(viewb)) {
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model.addNodeData(n);
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}
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// make sure links to all parent nodes appear
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var parentkey = myWholeModel.getParentKeyForNodeData(n);
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var parent = myWholeModel.findNodeDataForKey(parentkey);
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if (parent !== null) {
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if (n.bounds.intersectsRect(viewb)) { // N is inside viewport
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model.addNodeData(parent); // so that link to parent appears
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} else { // N is outside of viewport
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// see if there's a parent that is in the viewport,
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// or if the link might cross over the viewport
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b.set(n.bounds);
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b.unionRect(parent.bounds);
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if (b.intersectsRect(viewb)) {
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model.addNodeData(n); // add N so that link to parent appears
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}
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}
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}
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}
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diagram.skipsUndoManager = oldskips;
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if (myRemoveTimer === null) {
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// only remove offscreen nodes after a delay
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myRemoveTimer = setTimeout(function() { removeOffscreen(diagram); }, 3000);
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}
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updateCounts(); // only for this sample
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}
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// occasionally remove Parts that are offscreen from the Diagram
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var myRemoveTimer = null;
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function removeOffscreen(diagram) {
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myRemoveTimer = null;
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var viewb = diagram.viewportBounds;
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var model = diagram.model;
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var remove = []; // collect for later removal
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var it = diagram.nodes;
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while (it.next()) {
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var n = it.value;
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var d = n.data;
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if (d === null) continue;
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if (!n.actualBounds.intersectsRect(viewb) && !n.isSelected) {
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// even if the node is out of the viewport, keep it if it is selected or
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// if any link connecting with the node is still in the viewport
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if (!n.linksConnected.any(function(l) { return l.actualBounds.intersectsRect(viewb); })) {
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remove.push(d);
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}
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}
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}
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if (remove.length > 0) {
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var oldskips = diagram.skipsUndoManager;
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diagram.skipsUndoManager = true;
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model.removeNodeDataCollection(remove);
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diagram.skipsUndoManager = oldskips;
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}
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updateCounts(); // only for this sample
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}
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// end of virtualized Diagram
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// A very simple tree layout.
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// Basic tree layout parameters
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var nodeSpacing = 4;
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var layerSpacing = 50;
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// Layout the whole tree just using the model, not any Nodes or Links.
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function layoutTree(model) {
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var ndata = model.nodeDataArray;
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// layout each tree root
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if (HORIZONTAL) {
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var y = 0;
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for (var i = 0; i < ndata.length; i++) {
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var d = ndata[i];
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// is this a root node?
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if (!d._parent) {
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y = walkTreeH(d, 0, y) + d.bounds.height + nodeSpacing;
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}
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}
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} else { // !HORIZONTAL
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var x = 0;
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for (var i = 0; i < ndata.length; i++) {
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var d = ndata[i];
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// is this a root node?
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if (!d._parent) {
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x = walkTreeV(d, x, 0) + d.bounds.width + nodeSpacing;
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}
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}
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}
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// can't depend on regular bounds computation that depends on all Nodes existing
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myDiagram.fixedBounds = computeDocumentBounds(model);
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}
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// Walk subtrees from each root node, positioning as we go.
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function walkTreeH(parent, oldx, oldy) { // HORIZONTAL
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var origy = oldy;
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var newy = oldy;
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var childarr = parent._children;
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if (childarr) {
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for (var i = 0; i < childarr.length; i++) {
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var child = childarr[i];
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newy = walkTreeH(child, oldx + child.bounds.width + layerSpacing, oldy);
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oldy = newy + child.bounds.height + nodeSpacing;
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}
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}
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parent.bounds.x = oldx;
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parent.bounds.y = (origy + newy) / 2;
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return newy;
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}
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function walkTreeV(parent, oldx, oldy) { // !HORIZONTAL
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var origx = oldx;
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var newx = oldx;
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var childarr = parent._children;
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if (childarr) {
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for (var i = 0; i < childarr.length; i++) {
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var child = childarr[i];
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newx = walkTreeV(child, oldx, oldy + child.bounds.height + layerSpacing);
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oldx = newx + child.bounds.width + nodeSpacing;
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}
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}
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parent.bounds.x = (origx + newx) / 2;
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parent.bounds.y = oldy;
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return newx;
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}
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// end of layoutTree functionality
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// This function is only used in this sample to demonstrate the effects of the virtualization.
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// In a real application you would delete this function and all calls to it.
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function updateCounts() {
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document.getElementById("myMessage1").textContent = myWholeModel.nodeDataArray.length;
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document.getElementById("myMessage2").textContent = myDiagram.nodes.count;
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document.getElementById("myMessage4").textContent = myDiagram.links.count;
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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="background-color: white; border: solid 1px black; width: 100%; height: 600px"></div>
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<div id="description">
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<p>This uses a <a>TreeModel</a> but not <a>TreeLayout</a>.</p>
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Node data in Model: <span id="myMessage1"></span>.
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Actual Nodes in Diagram: <span id="myMessage2"></span>.
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Actual Links in Diagram: <span id="myMessage4"></span>.
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</div>
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</div>
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</body>
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</html>
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