pixel-editor/js/Util.js

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