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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>PanelLayout GoJS Sample</title>
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<meta name="description" content="Example custom PanelLayout." />
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<!-- Copyright 1998-2019 by Northwoods Software Corporation. -->
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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; // for conciseness in defining templates
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myDiagram = $(go.Diagram, "myDiagramDiv", // create a Diagram for the DIV HTML element
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{
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"undoManager.isEnabled": true // enable undo & redo
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});
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function PanelLayoutCascading() {
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go.PanelLayout.call(this);
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}
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go.Diagram.inherit(PanelLayoutCascading, go.PanelLayout);
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/**
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* Given the available size, measure the Panel and
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* determine its expected drawing size. Sets the measuredBounds of the object.
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*
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* This must call {@link #measureElement} with each Panel element.
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*
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* This must also construct the union.width and union.height of the passed in union Rect argument.
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*
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* @this {PanelLayout}
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* @param {Panel} panel Panel which called this layout
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* @param {number} width expected width of the panel
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* @param {number} height expected width of the panel
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* @param {Array.<GraphObject>} elements Array of Panel elements
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* @param {Rect} union rectangle to contain the expected union bounds of every element in the Panel. Useful for arrange.
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* @param {number} minw minimum width of the panel
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* @param {number} minh minimum height of the panel
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*/
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PanelLayoutCascading.prototype.measure = function(panel, width, height, elements, union, minw, minh) {
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var l = elements.length;
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for (var i = 0; i < l; i++) {
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var elem = elements[i];
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this.measureElement(elem, width, height, minw, minh);
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var mb = elem.measuredBounds;
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union.width += mb.width;
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union.height += mb.height;
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}
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}
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/**
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* Given the panel and its list of elements, arrange each element.
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*
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* This must call {@link #arrangeElement} with each Panel element, which will set that element's {@link GraphObject#actualBounds}.
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*
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* For arranging some elements, it is useful to know the total unioned area of every element.
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* This Rect can be used to right-align or center-align, etc, elements within an area.
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*
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* @this {PanelLayout}
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* @param {Panel} panel Panel which called this layout
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* @param {Rect} ar arranged bounds of the panel
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* @param {Array.<GraphObject>} elements Array of Panel elements
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* @param {Rect} union rectangle, if properly constructed in {@link #measure}, that contains the expected union bounds of every element in the Panel.
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*/
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PanelLayoutCascading.prototype.arrange = function(panel, elements, union) {
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var l = elements.length;
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var x = 0;
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var y = 0;
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for (var i = 0; i < l; i++) {
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var elem = elements[i];
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var mb = elem.measuredBounds;
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this.arrangeElement(elem, x, y, mb.width, mb.height);
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/*
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* By incrementing the arranged x and y by the width and height, we arrange each object in a diagonal fashion:
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* A
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* B
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* C
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* D
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*/
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x += mb.width;
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y += mb.height;
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}
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}
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// Name and register the PanelLayout, so we can reference it in go.GraphObject.make:
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go.Panel.definePanelLayout('Cascading', new PanelLayoutCascading())
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// define a simple Node template
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myDiagram.nodeTemplate =
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$(go.Node, "Auto",
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$(go.Shape, { fill: "transparent" }, new go.Binding("stroke", "color")),
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$(go.Panel, "Cascading",
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$(go.Shape, "RoundedRectangle", { width: 20, height: 20, fill: go.Brush.randomColor(), strokeWidth: 0 }),
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$(go.Shape, "Diamond", { width: 25, height: 25, fill: go.Brush.randomColor(), strokeWidth: 0 }),
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$(go.Shape, "Circle", { width: 25, height: 25, fill: go.Brush.randomColor(), strokeWidth: 0 }),
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$(go.Shape, "TriangleDown", { width: 20, height: 20, fill: go.Brush.randomColor(), strokeWidth: 0 })
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)
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);
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myDiagram.model = new go.GraphLinksModel(
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[
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{ key: "Alpha", color: "lightblue" },
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{ key: "Beta", color: "orange" },
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{ key: "Gamma", color: "lightgreen" },
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{ key: "Delta", color: "pink" }
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],
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[
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// no links
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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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<!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
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This also adds a border to help see the edges of the viewport. -->
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<div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
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<p>
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This sample demonstrates creating a simple custom <a>PanelLayout</a>. It merely cascades the elements diagonally,
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as if combining a Horizontal and Vertical panel.
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</p>
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<p>
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Creating your own Panel layouts is very uncommon, and you should not need to create your own to use GoJS effectively.
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However there may be custom applications that require creating a custom Panel layout.
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</p>
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</div>
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</body>
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</html>
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