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<!DOCTYPE html>
<html>
<head>
<title>LightBox Style HTML Custom Context Menu</title>
<meta name="description" content="Demonstrate context menus implemented in HTML covering the whole window." />
<!-- Copyright 1998-2016 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<style type="text/css">
/* CSS for the lightbox context menu */
#LBblack {
z-index:299;
position: absolute;
display: none;
top: 0%;
left: 0%;
width: 100%;
height: 100%;
background-color: black;
-moz-opacity: 0.8;
opacity:.80;
filter: alpha(opacity=80);
}
#LBlight {
z-index:300;
position: absolute;
display: none;
text-align: center;
left: 25%;
width: 50%;
background-color: #F5F5F5;
padding: 16px;
border: 16px solid #444;
border-radius: 10px;
}
#LBlight ul { list-style: none; }
#LBlight li {
font:700 20px/1em Helvetica, Arial, sans-serif;
position: relative;
min-width: 60px;
}
#LBlight a {
color: #444;
display: inline-block;
padding: 6px;
text-decoration: none;
margin: 12px;
border: 1px solid gray;
border-radius: 10px;
}
#LBlight a:hover { background: #444; }
#LBlight li:hover a { color: #EEE; }
</style>
<script src="go.js"></script>
<link href="../assets/css/goSamples.css" rel="stylesheet" type="text/css" /> <!-- you don't need to use this -->
<script src="goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
var myDiagram = null;
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", // create a Diagram for the DIV HTML element
{ initialContentAlignment: go.Spot.Center, "undoManager.isEnabled": true });
// define a simple Node template (but use the default Link template)
myDiagram.nodeTemplate =
$(go.Node, "Auto",
// We make a dummy context menu so that the contextMenuTool will activate,
// but we don't use this adornment
{ contextMenu: $(go.Adornment) },
$(go.Shape, "RoundedRectangle",
// Shape.fill is bound to Node.data.color
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 3 }, // some room around the text
// TextBlock.text is bound to Node.data.key
new go.Binding("text", "key"))
);
// create the model data that will be represented by Nodes and Links
myDiagram.model = new go.GraphLinksModel(
[
{ key: "Alpha", color: "lightblue" },
{ key: "Beta", color: "orange" },
{ key: "Gamma", color: "lightgreen" },
{ key: "Delta", color: "pink" }
],
[
{ from: "Alpha", to: "Beta" },
{ from: "Alpha", to: "Gamma" },
{ from: "Beta", to: "Beta" },
{ from: "Gamma", to: "Delta" },
{ from: "Delta", to: "Alpha" }
]);
// This is a dummy context menu for the whole Diagram:
myDiagram.contextMenu = $(go.Adornment);
// This is the actual HTML LightBox-style context menu, composed of buttons and a background:
var LBlight = document.getElementById("LBlight");
var LBblack = document.getElementById("LBblack");
// We don't want the div acting as a context menu to have a (browser) context menu!
LBlight.addEventListener("contextmenu", function(e) { e.preventDefault(); return false; }, false);
LBlight.addEventListener("selectstart", function(e) { e.preventDefault(); return false; }, false);
LBblack.addEventListener("contextmenu", function(e) { e.preventDefault(); return false; }, false);
LBblack.addEventListener("click", function(e) { cxTool.stopTool(); e.preventDefault(); return false; }, false);
// Override the ContextMenuTool.showContextMenu and hideContextMenu methods
// in order to modify the HTML appropriately.
var cxTool = myDiagram.toolManager.contextMenuTool;
// This is the override of ContextMenuTool.showContextMenu:
// This does not not need to call the base method.
cxTool.showContextMenu = function(contextmenu, obj) {
var diagram = this.diagram;
if (diagram === null) return;
// Hide any other existing context menu.
if (contextmenu !== this.currentContextMenu) {
this.hideContextMenu();
}
// Show only the relevant buttons given the current state.
var cmd = diagram.commandHandler;
document.getElementById("LBcut").style.display = cmd.canCutSelection() ? "block" : "none";
document.getElementById("LBcopy").style.display = cmd.canCopySelection() ? "block" : "none";
document.getElementById("LBpaste").style.display = cmd.canPasteSelection() ? "block" : "none";
document.getElementById("LBdelete").style.display = cmd.canDeleteSelection() ? "block" : "none";
document.getElementById("LBcolor").style.display = obj !== null ? "block" : "none";
// Now show the whole LightBox context menu
LBlight.style.display = "block";
LBblack.style.display = "block";
// Remember that there is now a context menu showing
this.currentContextMenu = contextmenu;
}
// This is the corresponding override of ContextMenuTool.hideContextMenu:
// This does not not need to call the base method.
cxTool.hideContextMenu = function() {
if (this.currentContextMenu === null) return;
LBlight.style.display = "none";
LBblack.style.display = "none";
this.currentContextMenu = null;
}
}
// This is the general menu command handler, parameterized by the name of the command.
function cxcommand(val) {
var diagram = myDiagram;
if (!(diagram.currentTool instanceof go.ContextMenuTool)) return;
switch (val) {
case "Cut": diagram.commandHandler.cutSelection(); break;
case "Copy": diagram.commandHandler.copySelection(); break;
case "Paste": diagram.commandHandler.pasteSelection(diagram.lastInput.documentPoint); break;
case "Delete": diagram.commandHandler.deleteSelection(); break;
case "Color": changeColor(diagram); break;
}
diagram.currentTool.stopTool();
}
// A custom command, for changing the color of the selected node(s).
function changeColor(diagram) {
// Always make changes in a transaction, except when initializing the diagram.
diagram.startTransaction("change color");
diagram.selection.each(function(node) {
if (node instanceof go.Node) { // ignore any selected Links and simple Parts
// Examine and modify the data, not the Node directly.
var data = node.data;
if (data.color === "red") {
// Call setDataProperty to support undo/redo as well as
// automatically evaluating any relevant bindings.
diagram.model.setDataProperty(data, "color", go.Brush.randomColor());
} else {
diagram.model.setDataProperty(data, "color", "red");
}
}
});
diagram.commitTransaction("change color");
}
</script>
</head>
<body onload="init()">
<div id="sample">
<p>LightBox-style context menu <b>GoJS</b> Sample</p>
<div style="display: inline-block;">
<div style="position: relative">
<div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
</div>
<div id="description">
<p>This demonstrates the implementation of a custom context menu
in the LightBox style commonly used on mobile devices.</p>
<p>For a regular HTML context menu implementation, see the <a href="customContextMenu.html">Custom Context Menu</a> sample.</p>
<p>Right-click or tap-hold on a Node to bring up a context menu.
If you have a selection copied in the clipboard,
you can bring up a context menu anywhere to paste.</p>
<p>The "Color" command changes the color of the selected node(s),
alternating between "red" and a random color.
It does so by iterating over the <a>Diagram.selection</a> and calling
<a>Model.setDataProperty</a> to set the "color" property of each node's data.
This assumes that there is a data <a>Binding</a> in the node template
that depends on the "color" property on the data.</p>
</div>
</div>
<div id="LBlight">
<ul>
<li><a href="#" id="LBcut" onclick="cxcommand('Cut')">Cut</a></li>
<li><a href="#" id="LBcopy" onclick="cxcommand('Copy')">Copy</a></li>
<li><a href="#" id="LBpaste" onclick="cxcommand('Paste')">Paste</a></li>
<li><a href="#" id="LBdelete" onclick="cxcommand('Delete')">Delete</a></li>
<li><a href="#" id="LBcolor" onclick="cxcommand('Color')">Color</a></li>
</ul>
</div>
<div id="LBblack"></div>
</div>
</body>
</html>