gojs
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Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, viewport-fit=cover"/>
<meta name="description" content="Example custom PanelLayout."/>
<link rel="stylesheet" href="../assets/css/style.css"/>
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<title>PanelLayout GoJS Sample</title>
</head>
<body>
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<h1 class="my-0 p-1 ">GoJS</h1>
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<!-- * * * * * * * * * * * * * -->
<!-- Start of GoJS sample code -->
<script src="../release/go.js"></script>
<div id="allSampleContent" class="p-4 w-full">
<script id="code">
class PanelLayoutCascading extends go.PanelLayout {
constructor() {
super();
this.name = "Cascading";
}
/**
* Given the available size, measure the Panel and
* determine its expected drawing size. Sets the measuredBounds of the object.
*
* This must call {@link #measureElement} with each Panel element.
*
* This must also construct the union.width and union.height of the passed in union Rect argument.
*
* @this {PanelLayout}
* @param {Panel} panel Panel which called this layout
* @param {number} width expected width of the panel
* @param {number} height expected width of the panel
* @param {Array.<GraphObject>} elements Array of Panel elements
* @param {Rect} union rectangle to contain the expected union bounds of every element in the Panel. Useful for arrange.
* @param {number} minw minimum width of the panel
* @param {number} minh minimum height of the panel
*/
measure(panel, width, height, elements, union, minw, minh) {
const l = elements.length;
for (let i = 0; i < l; i++) {
const elem = elements[i];
this.measureElement(elem, width, height, minw, minh);
const mb = elem.measuredBounds;
union.width += mb.width;
union.height += mb.height;
}
}
/**
* Given the panel and its list of elements, arrange each element.
*
* This must call {@link #arrangeElement} with each Panel element, which will set that element's {@link GraphObject#actualBounds}.
*
* For arranging some elements, it is useful to know the total unioned area of every element.
* This Rect can be used to right-align or center-align, etc, elements within an area.
*
* @this {PanelLayout}
* @param {Panel} panel Panel which called this layout
* @param {Rect} ar arranged bounds of the panel
* @param {Array.<GraphObject>} elements Array of Panel elements
* @param {Rect} union rectangle, if properly constructed in {@link #measure}, that contains the expected union bounds of every element in the Panel.
*/
arrange(panel, elements, union) {
const l = elements.length;
let x = 0;
let y = 0;
for (let i = 0; i < l; i++) {
const elem = elements[i];
const mb = elem.measuredBounds;
this.arrangeElement(elem, x, y, mb.width, mb.height);
/*
* By incrementing the arranged x and y by the width and height, we arrange each object in a diagonal fashion:
* A
* B
* C
* D
*/
x += mb.width;
y += mb.height;
}
}
}
// end of PanelLayoutCascading
// Register the PanelLayout so that go.GraphObject.make can use it by name:
go.Panel.definePanelLayout('Cascading', new PanelLayoutCascading())
function init() {
// Since 2.2 you can also author concise templates with method chaining instead of GraphObject.make
// For details, see https://gojs.net/latest/intro/buildingObjects.html
const $ = go.GraphObject.make;
myDiagram =
new go.Diagram("myDiagramDiv",
{ "undoManager.isEnabled": true });
// Define a simple Node template that includes a Cascading Panel holding
// some number of item Panels holding Shapes, based on data.items being an Array
// of item descriptor objects.
myDiagram.nodeTemplate =
$(go.Node, "Auto",
{ width: 100, height: 100 },
$(go.Shape,
{ fill: "transparent", strokeWidth: 2 },
new go.Binding("stroke", "color")),
$(go.Panel, "Cascading",
new go.Binding("itemArray", "items"),
{
itemTemplate:
$(go.Panel,
$(go.Shape,
{ width: 20, height: 20, strokeWidth: 0 },
new go.Binding("figure", "fig"),
new go.Binding("fill", "color"))
)
})
);
myDiagram.model = new go.GraphLinksModel(
[
{
key: 1,
color: "lightgreen",
items: [
{ fig: "RoundedRectangle", color: "lightblue" },
{ fig: "Triangle", color: "pink" }
]
},
{
key: 2,
color: "lightblue",
items: [
{ fig: "RoundedRectangle", color: "lightgray" },
{ fig: "Square", color: "yellow" },
{ fig: "Circle", color: "orange" }
]
},
{
key: 3,
color: "purple",
items: [
{ fig: "Diamond", color: "red" }
]
},
{
key: 4,
color: "orange",
items: [
{ fig: "Circle", color: "green" },
{ fig: "Square", color: "blue" },
{ fig: "Triangle", color: "red" },
{ fig: "TriangleRight", color: "green" }
]
}
]);
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
This also adds a border to help see the edges of the viewport. -->
<div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
<p>
This sample demonstrates creating a simple custom <a>PanelLayout</a>. It merely cascades the elements diagonally,
as if combining a Horizontal and Vertical panel.
</p>
<p>
Creating your own Panel layouts is very uncommon, and you should not need to create your own to use GoJS effectively.
However there may be apps that require creating a custom Panel layout because the standard panel layouts
do not offer the precise behavior that you want.
</p>
</div>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
</div>
</body>
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