81 lines
1.7 KiB
JavaScript
81 lines
1.7 KiB
JavaScript
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import { assign } from 'min-dash';
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/**
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* @typedef {import('../../../model').Base} Base
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*
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* @typedef {import('../../../util/Types').Point} Point
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*
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* @typedef {import('../../../core/Canvas').default} Canvas
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*/
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var round = Math.round;
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/**
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* A handler that implements reversible addition of shapes.
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*
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* @param {canvas} Canvas
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*/
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export default function CreateShapeHandler(canvas) {
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this._canvas = canvas;
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}
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CreateShapeHandler.$inject = [ 'canvas' ];
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// api //////////////////////
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/**
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* Appends a shape to a target shape
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*
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* @param {Object} context
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* @param {Base} context.parent The parent.
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* @param {Point} context.position The position at which to create the new shape.
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* @param {number} [context.parentIndex] The optional index at which to add the
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* shape to the parent's children.
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*/
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CreateShapeHandler.prototype.execute = function(context) {
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var shape = context.shape,
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positionOrBounds = context.position,
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parent = context.parent,
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parentIndex = context.parentIndex;
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if (!parent) {
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throw new Error('parent required');
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}
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if (!positionOrBounds) {
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throw new Error('position required');
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}
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// (1) add at event center position _or_ at given bounds
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if (positionOrBounds.width !== undefined) {
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assign(shape, positionOrBounds);
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} else {
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assign(shape, {
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x: positionOrBounds.x - round(shape.width / 2),
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y: positionOrBounds.y - round(shape.height / 2)
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});
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}
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// (2) add to canvas
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this._canvas.addShape(shape, parent, parentIndex);
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return shape;
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};
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/**
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* Undo append by removing the shape
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*/
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CreateShapeHandler.prototype.revert = function(context) {
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var shape = context.shape;
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// (3) remove form canvas
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this._canvas.removeShape(shape);
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return shape;
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};
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