71 lines
1.6 KiB
JavaScript
71 lines
1.6 KiB
JavaScript
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import inherits from 'inherits-browser';
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import CreateShapeHandler from './CreateShapeHandler';
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/**
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* @typedef {import('../../../core/Canvas').default} Canvas
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*/
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/**
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* A handler that attaches a label to a given target shape.
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*
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* @param {Canvas} canvas
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*/
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export default function CreateLabelHandler(canvas) {
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CreateShapeHandler.call(this, canvas);
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}
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inherits(CreateLabelHandler, CreateShapeHandler);
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CreateLabelHandler.$inject = [ 'canvas' ];
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// api //////////////////////
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var originalExecute = CreateShapeHandler.prototype.execute;
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/**
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* Appends a label to a target shape.
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*
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* @method CreateLabelHandler#execute
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*
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* @param {Object} context
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* @param {ElementDescriptor} context.target the element the label is attached to
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* @param {ElementDescriptor} context.parent the parent object
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* @param {Point} context.position position of the new element
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*/
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CreateLabelHandler.prototype.execute = function(context) {
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var label = context.shape;
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ensureValidDimensions(label);
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label.labelTarget = context.labelTarget;
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return originalExecute.call(this, context);
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};
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var originalRevert = CreateShapeHandler.prototype.revert;
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/**
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* Undo append by removing the shape
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*/
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CreateLabelHandler.prototype.revert = function(context) {
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context.shape.labelTarget = null;
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return originalRevert.call(this, context);
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};
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// helpers //////////////////////
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function ensureValidDimensions(label) {
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// make sure a label has valid { width, height } dimensions
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[ 'width', 'height' ].forEach(function(prop) {
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if (typeof label[prop] === 'undefined') {
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label[prop] = 0;
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}
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});
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}
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