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58 lines
1.5 KiB
58 lines
1.5 KiB
4 years ago
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var index = (function (element, listener) {
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var expand = document.createElement('_');
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var shrink = expand.appendChild(document.createElement('_'));
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var expandChild = expand.appendChild(document.createElement('_'));
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var shrinkChild = shrink.appendChild(document.createElement('_'));
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var lastWidth = void 0,
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lastHeight = void 0;
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shrink.style.cssText = expand.style.cssText = 'height:100%;left:0;opacity:0;overflow:hidden;pointer-events:none;position:absolute;top:0;transition:0s;width:100%;z-index:-1';
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shrinkChild.style.cssText = expandChild.style.cssText = 'display:block;height:100%;transition:0s;width:100%';
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shrinkChild.style.width = shrinkChild.style.height = '200%';
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element.appendChild(expand);
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test();
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return stop;
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function test() {
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unbind();
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var width = element.offsetWidth;
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var height = element.offsetHeight;
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if (width !== lastWidth || height !== lastHeight) {
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lastWidth = width;
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lastHeight = height;
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expandChild.style.width = width * 2 + 'px';
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expandChild.style.height = height * 2 + 'px';
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expand.scrollLeft = expand.scrollWidth;
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expand.scrollTop = expand.scrollHeight;
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shrink.scrollLeft = shrink.scrollWidth;
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shrink.scrollTop = shrink.scrollHeight;
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listener({ width: width, height: height });
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}
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shrink.addEventListener('scroll', test);
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expand.addEventListener('scroll', test);
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}
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function unbind() {
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shrink.removeEventListener('scroll', test);
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expand.removeEventListener('scroll', test);
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}
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function stop() {
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unbind();
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element.removeChild(expand);
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}
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});
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module.exports = index;
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