If there is no link template specified to a tree view of 5000 items, the tree view works very smooth.
But when a link template is applied, the rendering,selection & scrolling becomes very slow. Can it be solved without virtualization ?
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>GoJS Tree View</title>
<meta name="description" content="A traditional tree view using TreeLayout and orthogonal links." />
<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="D:\Projects\IControler9\IControler\UI\Scripts\Go\go.js"></script>
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram =
$(go.Diagram, "myDiagramDiv",
{
allowMove: true,
allowCopy: true,
allowDelete: false,
allowDragOut: true,
allowDrop: true,
allowZoom: false,
"animationManager.isEnabled": false,
allowHorizontalScroll: false,
layout:
$(go.TreeLayout,
{
alignment: go.TreeLayout.AlignmentStart,
angle: 0,
compaction: go.TreeLayout.CompactionNone,
layerSpacing: 16,
layerSpacingParentOverlap: 1,
nodeIndent: 2,
nodeIndentPastParent: 0.88,
nodeSpacing: 0,
setsPortSpot: false,
setsChildPortSpot: false
})
});
myDiagram.nodeTemplate =
$(go.Node,
{ // no Adornment: instead change panel background color by binding to Node.isSelected
selectionAdorned: false,
// a custom function to allow expanding/collapsing on double-click
// this uses similar logic to a TreeExpanderButton
doubleClick: function(e, node) {
var cmd = myDiagram.commandHandler;
if (node.isTreeExpanded) {
if (!cmd.canCollapseTree(node)) return;
} else {
if (!cmd.canExpandTree(node)) return;
}
e.handled = true;
if (node.isTreeExpanded) {
cmd.collapseTree(node);
} else {
cmd.expandTree(node);
}
}
},
$("TreeExpanderButton",
{
width: 14,
"ButtonBorder.fill": "whitesmoke",
"ButtonBorder.stroke": null,
"_buttonFillOver": "rgba(0,128,255,0.25)",
"_buttonStrokeOver": null
}),
$(go.Panel, "Horizontal",
{ position: new go.Point(16, 0) },
new go.Binding("background", "isSelected", function (s) { return (s ? "lightblue" : "white"); }).ofObject(),
$(go.Picture,
{
width: 18, height: 18,
margin: new go.Margin(0, 4, 0, 0),
imageStretch: go.GraphObject.Uniform
},
// bind the picture source on two properties of the Node
// to display open folder, closed folder, or document
new go.Binding("source", "isTreeExpanded", imageConverter).ofObject(),
new go.Binding("source", "isTreeLeaf", imageConverter).ofObject()),
$(go.TextBlock,
{ font: '9pt Verdana, sans-serif' },
new go.Binding("text", "key", function(s) { return "item " + s; }))
) // end Horizontal Panel
); // end Node
// without lines
//myDiagram.linkTemplate = $(go.Link);
// // with lines
myDiagram.linkTemplate =
$(go.Link,
{ selectable: false,
routing: go.Link.Orthogonal,
fromEndSegmentLength: 4,
toEndSegmentLength: 4,
fromSpot: new go.Spot(0.001, 1, 7, 0),
toSpot: go.Spot.Left },
$(go.Shape,
{ stroke: 'gray', strokeDashArray: [1,2] }));
// create a random tree
var nodeDataArray = [{ key: 0 }];
var max = 5000;
var count = 0;
while (count < max) {
count = makeTree(3, count, max, nodeDataArray, nodeDataArray[0]);
}
myDiagram.model = new go.TreeModel(nodeDataArray);
}
function makeTree(level, count, max, nodeDataArray, parentdata) {
var numchildren = Math.floor(Math.random() * 10);
for (var i = 0; i < numchildren; i++) {
if (count >= max) return count;
count++;
var childdata = { key: count, parent: parentdata.key };
nodeDataArray.push(childdata);
if (level > 0 && Math.random() > 0.5) {
count = makeTree(level - 1, count, max, nodeDataArray, childdata);
}
}
return count;
}
// takes a property change on either isTreeLeaf or isTreeExpanded and selects the correct image to use
function imageConverter(prop, picture) {
var node = picture.part;
if (node.isTreeLeaf) {
return "images/document.png";
} else {
if (node.isTreeExpanded) {
return "images/openFolder.png";
} else {
return "images/closedFolder.png";
}
}
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="border: 1px solid black; width: 500px; height: 650px"></div>
</div>
</body>
</html>