113 lines
4.4 KiB
HTML
113 lines
4.4 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>Buttons that show on Hover</title>
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<meta name="description" content="When the mouse hovers over a node, show a set of Buttons that could perform various actions." />
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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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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 = $(go.Diagram, "myDiagramDiv", // create a Diagram for the DIV HTML element
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{
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initialContentAlignment: go.Spot.Center, // center the content
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hoverDelay: 200, // controls how long to wait motionless (msec) before showing Adornment
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"undoManager.isEnabled": true // enable undo & redo
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});
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// this is shown by the mouseHover event handler
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var nodeHoverAdornment =
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$(go.Adornment, "Spot",
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{
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background: "transparent",
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// hide the Adornment when the mouse leaves it
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mouseLeave: function(e, obj) {
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var ad = obj.part;
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ad.adornedPart.removeAdornment("mouseHover");
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}
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},
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$(go.Placeholder,
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{
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background: "transparent", // to allow this Placeholder to be "seen" by mouse events
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isActionable: true, // needed because this is in a temporary Layer
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click: function(e, obj) {
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var node = obj.part.adornedPart;
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node.diagram.select(node);
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}
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}),
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$("Button",
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{ alignment: go.Spot.Left, alignmentFocus: go.Spot.Right },
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{ click: function(e, obj) { alert("Hi!"); } },
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$(go.TextBlock, "Hi!")),
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$("Button",
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{ alignment: go.Spot.Right, alignmentFocus: go.Spot.Left },
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{ click: function(e, obj) { alert("Bye"); } },
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$(go.TextBlock, "Bye"))
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);
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// define a simple Node template
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myDiagram.nodeTemplate =
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$(go.Node, "Auto", // the Shape will go around the TextBlock
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$(go.Shape, "RoundedRectangle", { strokeWidth: 0},
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// Shape.fill is bound to Node.data.color
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new go.Binding("fill", "color")),
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$(go.TextBlock,
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{ margin: 8 }, // some room around the text
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// TextBlock.text is bound to Node.data.key
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new go.Binding("text", "key")),
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{ // show the Adornment when a mouseHover event occurs
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mouseHover: function(e, obj) {
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var node = obj.part;
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nodeHoverAdornment.adornedObject = node;
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node.addAdornment("mouseHover", nodeHoverAdornment);
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}
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}
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);
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// but use the default Link template, by not setting Diagram.linkTemplate
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// create the model data that will be represented by Nodes and Links
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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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{ from: "Alpha", to: "Beta" },
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{ from: "Alpha", to: "Gamma" },
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{ from: "Beta", to: "Beta" },
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{ from: "Gamma", to: "Delta" },
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{ from: "Delta", to: "Alpha" }
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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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<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 buttons that appear when the user hovers over a node with the mouse.
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The advantage of using an <a>Adornment</a> is that it keeps the Node template simpler.
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That means there are less resources used to create nodes -- only that one adornment can be shown.
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</p>
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<p>
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However, using a template as the <a>Part.selectionAdornmentTemplate</a> would allow for more
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than one set of buttons to be shown simultaneously, one set for each selected node.
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</p>
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<p>
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This technique does not work on touch devices.
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</p>
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<p>
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If you want to show such an Adornment on mouseEnter and mouseLeave, rather than on mouseHover,
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the code is given in the documentation for the <a>GraphObject.mouseEnter</a> property.
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</p>
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</div>
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</body>
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</html> |