89 lines
2.9 KiB
JavaScript
89 lines
2.9 KiB
JavaScript
// Acts as a public static class
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class Util {
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/** Tells if a pixel is empty (has alpha = 0)
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*
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* @param {*} pixel
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*/
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static isPixelEmpty(pixel) {
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if (pixel == null || pixel === undefined) {
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return false;
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}
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// If the alpha channel is 0, the current pixel is empty
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if (pixel[3] == 0) {
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return true;
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}
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return false;
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}
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/** Tells if element is a child of an element with class className
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*
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* @param {*} element
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* @param {*} className
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*/
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static isChildOfByClass(element, className) {
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// Getting the element with class className
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while (element != null && element.classList != null && !element.classList.contains(className)) {
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element = element.parentElement;
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}
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// If that element exists and its class is the correct one
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if (element != null && element.classList != null && element.classList.contains(className)) {
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// Then element is a chld of an element with class className
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return true;
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}
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return false;
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}
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/** Returns elementOrElementId if the argument is already an element, otherwise it finds
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* the element by its ID (given by the argument) and returns it
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*
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* @param {*} elementOrElementId The element to return, or the ID of the element to return
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* @returns The desired element
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*/
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static getElement(elementOrElementId) {
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if (typeof(elementOrElementId) == "object") {
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return elementOrElementId;
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}
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else if (typeof(elementOrElementId) == "string") {
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return document.getElementById(elementOrElementId);
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}
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else {
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console.log("Type not supported: " + typeof(elementOrElementId));
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}
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}
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// Returns the text content of the element with ID elementId
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static getText(elementId) {
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return Util.getElement(elementId).textContent;
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}
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// Sets the text content of the element with ID elementId
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static setText(elementId, text) {
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Util.getElement(elementId).textContent = text;
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}
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// Gets the value of the element with ID elementId
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static getValue(elementId) {
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return Util.getElement(elementId).value;
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}
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// Sets the value of the element with ID elementId
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static setValue(elementId, value) {
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Util.getElement(elementId).value = value;
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}
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//add class .selected to specified element
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static select(elementId) {
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Util.getElement(elementId).classList.add('selected');
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}
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//remove .selected class from specified element
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static deselect(elementId) {
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Util.getElement(elementId).classList.remove('selected');
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}
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//toggle the status of the .selected class on the specified element
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static toggle(elementId) {
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Util.getElement(elementId).classList.toggle('selected');
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}
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} |