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/* Image Magnifier — frontend */ |
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(function () { |
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function init() { |
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document.querySelectorAll('.bkmag-container[data-zoom]').forEach(function (container) { |
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if (container._bkmagInit) return; |
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container._bkmagInit = true; |
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|
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var img = container.querySelector('.bkmag-img'); |
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if (!img) return; |
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|
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var zoom = parseInt(container.getAttribute('data-zoom'), 10) || 250; |
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var lensSize = parseInt(container.getAttribute('data-lens-size'), 10) || 150; |
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var lensShape = container.getAttribute('data-lens-shape') || 'circle'; |
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var lensBorder = container.getAttribute('data-lens-border') || '#6c3fb5'; |
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var lensBorderW = parseInt(container.getAttribute('data-lens-border-w'), 10) || 2; |
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var lensShadow = container.getAttribute('data-lens-shadow') !== '0'; |
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var effect = container.getAttribute('data-effect') || 'lens'; |
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var previewW = parseInt(container.getAttribute('data-preview-w'), 10) || 300; |
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var previewH = parseInt(container.getAttribute('data-preview-h'), 10) || 300; |
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var previewBorder = container.getAttribute('data-preview-border') || '#e5e7eb'; |
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var previewRadius = parseInt(container.getAttribute('data-preview-radius'), 10) || 8; |
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|
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var helpers; |
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|
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if (effect === 'lens') { |
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var lens = document.createElement('div'); |
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lens.className = 'bkmag-lens'; |
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Object.assign(lens.style, { |
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width: lensSize + 'px', |
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height: lensSize + 'px', |
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borderRadius: lensShape === 'circle' ? '50%' : previewRadius + 'px', |
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border: lensBorderW + 'px solid ' + lensBorder, |
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boxShadow: lensShadow ? '0 4px 20px rgba(0,0,0,0.3)' : 'none', |
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backgroundImage: 'url(' + img.src + ')', |
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}); |
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container.appendChild(lens); |
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|
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container.addEventListener('mousemove', function (e) { |
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var rect = img.getBoundingClientRect(); |
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var containerRect = container.getBoundingClientRect(); |
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var imgW = img.offsetWidth; |
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var imgH = img.offsetHeight; |
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var cx = e.clientX - rect.left; |
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var cy = e.clientY - rect.top; |
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|
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var ratio = zoom / 100; |
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var bgW = imgW * ratio; |
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var bgH = imgH * ratio; |
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var bgX = -(cx * ratio - lensSize / 2); |
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var bgY = -(cy * ratio - lensSize / 2); |
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|
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lens.style.backgroundSize = bgW + 'px ' + bgH + 'px'; |
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lens.style.backgroundPosition = bgX + 'px ' + bgY + 'px'; |
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|
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var lensX = cx - lensSize / 2; |
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var lensY = cy - lensSize / 2; |
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lens.style.left = lensX + 'px'; |
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lens.style.top = lensY + 'px'; |
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lens.style.display = 'block'; |
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}); |
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|
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container.addEventListener('mouseleave', function () { |
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lens.style.display = 'none'; |
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}); |
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|
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} else { |
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/* side preview box */ |
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var preview = document.createElement('div'); |
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preview.className = 'bkmag-preview'; |
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Object.assign(preview.style, { |
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width: previewW + 'px', |
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height: previewH + 'px', |
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border: '1px solid ' + previewBorder, |
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borderRadius: previewRadius + 'px', |
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backgroundImage: 'url(' + img.src + ')', |
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boxShadow: '0 4px 24px rgba(0,0,0,0.12)', |
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}); |
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container.appendChild(preview); |
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|
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container.addEventListener('mousemove', function (e) { |
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var rect = img.getBoundingClientRect(); |
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var imgW = img.offsetWidth; |
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var imgH = img.offsetHeight; |
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var cx = e.clientX - rect.left; |
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var cy = e.clientY - rect.top; |
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|
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var ratio = zoom / 100; |
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var bgW = imgW * ratio; |
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var bgH = imgH * ratio; |
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var bgX = -(cx * ratio - previewW / 2); |
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var bgY = -(cy * ratio - previewH / 2); |
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|
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preview.style.backgroundSize = bgW + 'px ' + bgH + 'px'; |
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preview.style.backgroundPosition = bgX + 'px ' + bgY + 'px'; |
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preview.style.display = 'block'; |
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preview.style.top = Math.min(imgH - previewH, Math.max(0, cy - previewH / 2)) + 'px'; |
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}); |
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|
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container.addEventListener('mouseleave', function () { |
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preview.style.display = 'none'; |
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}); |
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} |
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}); |
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} |
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|
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if (document.readyState === 'loading') { |
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document.addEventListener('DOMContentLoaded', init); |
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} else { |
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init(); |
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} |
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}()); |
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|
