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/* global HTMLImageElement */ |
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/* global HTMLCanvasElement */ |
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/* global SVGElement */ |
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import getOptionsFromElement from "./getOptionsFromElement.js"; |
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import renderers from "../renderers"; |
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import {InvalidElementException} from "../exceptions/exceptions.js"; |
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// Takes an element and returns an object with information about how |
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// it should be rendered |
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// This could also return an array with these objects |
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// { |
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// element: The element that the renderer should draw on |
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// renderer: The name of the renderer |
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// afterRender (optional): If something has to done after the renderer |
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// completed, calls afterRender (function) |
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// options (optional): Options that can be defined in the element |
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// } |
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function getRenderProperties(element){ |
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// If the element is a string, query select call again |
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if(typeof element === "string"){ |
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return querySelectedRenderProperties(element); |
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} |
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// If element is array. Recursivly call with every object in the array |
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else if(Array.isArray(element)){ |
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var returnArray = []; |
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for(let i = 0; i < element.length; i++){ |
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returnArray.push(getRenderProperties(element[i])); |
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} |
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return returnArray; |
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} |
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// If element, render on canvas and set the uri as src |
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else if(typeof HTMLCanvasElement !== 'undefined' && element instanceof HTMLImageElement){ |
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return newCanvasRenderProperties(element); |
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} |
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// If SVG |
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else if( |
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(element && element.nodeName === 'svg') || |
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(typeof SVGElement !== 'undefined' && element instanceof SVGElement) |
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){ |
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return { |
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element: element, |
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options: getOptionsFromElement(element), |
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renderer: renderers.SVGRenderer |
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}; |
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} |
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// If canvas (in browser) |
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else if(typeof HTMLCanvasElement !== 'undefined' && element instanceof HTMLCanvasElement){ |
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return { |
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element: element, |
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options: getOptionsFromElement(element), |
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renderer: renderers.CanvasRenderer |
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}; |
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} |
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// If canvas (in node) |
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else if(element && element.getContext){ |
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return { |
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element: element, |
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renderer: renderers.CanvasRenderer |
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}; |
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} |
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else if(element && typeof element === 'object' && !element.nodeName) { |
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return { |
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element: element, |
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renderer: renderers.ObjectRenderer |
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}; |
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} |
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else{ |
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throw new InvalidElementException(); |
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} |
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} |
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function querySelectedRenderProperties(string){ |
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var selector = document.querySelectorAll(string); |
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if(selector.length === 0){ |
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return undefined; |
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} |
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else{ |
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let returnArray = []; |
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for(let i = 0; i < selector.length; i++){ |
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returnArray.push(getRenderProperties(selector[i])); |
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} |
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return returnArray; |
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} |
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} |
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89
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90
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function newCanvasRenderProperties(imgElement){ |
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var canvas = document.createElement('canvas'); |
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return { |
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element: canvas, |
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options: getOptionsFromElement(imgElement), |
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renderer: renderers.CanvasRenderer, |
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afterRender: function(){ |
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imgElement.setAttribute("src", canvas.toDataURL()); |
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} |
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}; |
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} |
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102
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export default getRenderProperties; |
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lindell /
JsBarcode
