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(function () { |
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'use strict'; |
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|
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function clamp(n, min, max) { |
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n = parseFloat(n); |
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if (isNaN(n)) n = min; |
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return Math.max(min, Math.min(max, n)); |
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} |
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|
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function getPosFromEvent(e, wrap, orientation) { |
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var rect = wrap.getBoundingClientRect(); |
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var point = e.touches && e.touches[0] ? e.touches[0] : e; |
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var x = point.clientX - rect.left; |
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var y = point.clientY - rect.top; |
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if (orientation === 'vertical') { |
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return clamp((y / rect.height) * 100, 0, 100); |
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} |
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return clamp((x / rect.width) * 100, 0, 100); |
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} |
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|
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function setCssPos(root, pos) { |
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root.style.setProperty('--bkbg-ba-pos', pos + '%'); |
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} |
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|
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function initOne(root) { |
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var inner = root.querySelector('.bkbg-ba-inner'); |
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if (!inner) return; |
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|
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var range = root.querySelector('.bkbg-ba-range'); |
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var orientation = root.getAttribute('data-orientation') || 'horizontal'; |
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var start = clamp(root.getAttribute('data-pos') || 50, 0, 100); |
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|
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setCssPos(root, start); |
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if (range) range.value = String(start); |
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|
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var dragging = false; |
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|
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function onDown(e) { |
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dragging = true; |
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try { e.preventDefault(); } catch (_) {} |
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var pos = getPosFromEvent(e, inner, orientation); |
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setCssPos(root, pos); |
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if (range) range.value = String(Math.round(pos)); |
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} |
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|
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function onMove(e) { |
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if (!dragging) return; |
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try { e.preventDefault(); } catch (_) {} |
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var pos = getPosFromEvent(e, inner, orientation); |
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setCssPos(root, pos); |
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if (range) range.value = String(Math.round(pos)); |
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} |
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|
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function onUp() { |
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dragging = false; |
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} |
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|
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// Prefer pointer events when available |
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if (window.PointerEvent) { |
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inner.addEventListener('pointerdown', onDown, { passive: false }); |
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window.addEventListener('pointermove', onMove, { passive: false }); |
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window.addEventListener('pointerup', onUp); |
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window.addEventListener('pointercancel', onUp); |
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} else { |
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inner.addEventListener('mousedown', onDown); |
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window.addEventListener('mousemove', onMove); |
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window.addEventListener('mouseup', onUp); |
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|
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inner.addEventListener('touchstart', onDown, { passive: false }); |
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window.addEventListener('touchmove', onMove, { passive: false }); |
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window.addEventListener('touchend', onUp); |
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window.addEventListener('touchcancel', onUp); |
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} |
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|
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if (range) { |
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range.addEventListener('input', function () { |
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var pos = clamp(range.value, 0, 100); |
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setCssPos(root, pos); |
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}); |
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} |
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} |
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|
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function initAll() { |
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var nodes = document.querySelectorAll('.bkbg-ba-wrap'); |
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for (var i = 0; i < nodes.length; i++) initOne(nodes[i]); |
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} |
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|
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if (document.readyState === 'loading') { |
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document.addEventListener('DOMContentLoaded', initAll); |
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} else { |
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initAll(); |
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} |
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})(); |
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