67 lines
2.3 KiB
JavaScript
67 lines
2.3 KiB
JavaScript
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window.onload = function() {
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checkImageSizes();
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var adminBarButton = document.getElementById('wp-admin-bar-resize-detection');
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if (adminBarButton) {
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adminBarButton.onclick = function() {
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adminBarButton.classList.toggle('ewww-fade');
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clearScaledImages();
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checkImageSizes();
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setTimeout(function() {
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adminBarButton.classList.toggle('ewww-fade');
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}, 500);
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};
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}
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}
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function checkImageSizes() {
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// Find images which have width or height greater than their natural
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// width or height, and give them a stark and ugly marker, as well
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// as a useful title.
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var imgs = document.getElementsByTagName("img");
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for (i = 0; i < imgs.length; i++) {
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imgs[i].classList.remove('scaled-image');
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checkImageScale(imgs[i]);
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}
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return false;
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}
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function checkImageScale(img) {
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if (!img.src) {
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return;
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}
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if ('string' == typeof img.src && img.src.search(/\.svg/) > -1) {
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return;
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}
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if ('string' == typeof img.src && img.src.search(/data:image/) > -1) {
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return;
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}
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console.log('checking size of: ' + img.src);
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if (img.naturalWidth) {
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if (img.naturalWidth > 25 && img.naturalHeight > 25 && img.clientWidth > 25 && img.clientHeight > 25) {
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// For each image with a natural width which isn't
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// a 1x1 image, check its size.
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var dPR = (window.devicePixelRatio || 1);
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var wrongWidth = (img.clientWidth * 1.5 * dPR < img.naturalWidth);
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var wrongHeight = (img.clientHeight * 1.5 * dPR < img.naturalHeight);
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if (wrongWidth || wrongHeight) {
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img.classList.add('scaled-image');
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img.title = "Forced to wrong size: " +
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img.clientWidth + "x" + img.clientHeight + ", natural is " +
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img.naturalWidth + "x" + img.naturalHeight + "!";
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}
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}
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}
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}
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function clearScaledImages() {
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var scaledImages = document.querySelectorAll('img.scaled-image');
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for (var i = 0, len = scaledImages.length; i < len; i++){
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scaledImages[i].classList.remove('scaled-image');
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}
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}
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document.addEventListener('lazyloaded', function(e){
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e.target.classList.remove('scaled-image');
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var current_title = e.target.title;
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if (0 === current_title.search('Forced to wrong size')) {
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e.target.title = '';
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}
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checkImageScale(e.target);
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});
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