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39 lines
1.9 KiB
HTML
Executable File
39 lines
1.9 KiB
HTML
Executable File
<!DOCTYPE html>
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<html>
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<head>
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<title>Draggable Link Labels That Stay On Path</title>
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<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
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<meta name="description" content="TypeScript: This variation on the LinkLabelDraggingTool extension restricts link labels to stay on the link's route while the user is dragging it." />
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<script src="../samples/assets/require.js"></script>
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<script src="../assets/js/goSamples.js"></script>
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<!-- 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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require(["LinkLabelOnPathDraggingScript"], function(app) {
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app.init();
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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="background-color: whitesmoke; border: solid 1px black; width: 100%; height: 600px"></div>
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<p>
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This sample demonstrates a custom Tool, LinkLabelOnPathDraggingTool, that allows the user to drag the label of a Link, but
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that keeps the label exactly on the path of the link. The tool is defined at <a href="LinkLabelOnPathDraggingTool.ts">LinkLabelOnPathDraggingTool.ts</a>.
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</p>
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<p>
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The label on the link can be any arbitrarily complex object.
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It is positioned by the <a>GraphObject.segmentIndex</a> and <a>GraphObject.segmentFraction</a> properties.
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The segmentIndex is set to NaN such that the whole link path acts as the segment, and the segmentFraction is set by the LinkLabelOnPathDraggingTool.
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A two-way data binding on segmentFraction automatically remembers any modified value on the link data object in the model.
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</p>
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<p>
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The tool is derived from a similar tool, <a href="LinkLabelDraggingTool.ts">LinkLabelDraggingTool.ts</a>, that allows
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the user to drag the label in any direction from the mid-point of the Link path.
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</p>
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</div>
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</body>
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</html> |