Южное землеустроительное предприятие — надежный поставщик нерудных материалов с собственным карьером

}, { passive: true }); elem.addEventListener('touchmove', (e) => { const dx = e.touches[0].clientX - pos.x; const newScrollLeft = pos.left - dx; if (newScrollLeft >= 0 && newScrollLeft <= (elem.scrollWidth - elem.clientWidth)) { elem.scrollLeft = newScrollLeft; } }, { passive: true }); } else { elem.style.overflowX = 'scroll'; } const smoothScrollStep = () => { const currentScrollLeft = elem.scrollLeft; const distance = targetScrollLeft - currentScrollLeft; if (Math.abs(distance) < 1) { elem.scrollLeft = targetScrollLeft; animationFrameId = null; return; } const newScrollLeft = currentScrollLeft + distance * 0.1; if (newScrollLeft >= 0 && newScrollLeft <= (elem.scrollWidth - elem.clientWidth)) { elem.scrollLeft = newScrollLeft; } animationFrameId = requestAnimationFrame(smoothScrollStep); }; const stopRunningAnimation = () => { if (animationFrameId !== null) { cancelAnimationFrame(animationFrameId); animationFrameId = null; } elem.style.setProperty('scroll-behavior', 'auto', 'important'); elem.scrollLeft = elem.scrollLeft; elem.style.scrollBehavior = ''; }; const handleWheelScroll = (event) => { if (!isElementCenteredInViewport(elem)) { return; } const visibleWidth = elem.offsetWidth; const maxScrollLeft = elem.scrollWidth - visibleWidth; if (maxScrollLeft <= 0) { return; } const delta = event.deltaY > 0 ? 1 : -1; const nextPosition = elem.scrollLeft + delta * Math.max(20, Math.round(visibleWidth / 2000)); const atLeftBoundary = elem.scrollLeft - 20 <= 0.5 && delta < 0; const atRightBoundary = elem.scrollLeft + 20 >= (maxScrollLeft - 0.5) && delta > 0; if (atLeftBoundary || atRightBoundary) return; event.preventDefault(); targetScrollLeft = Math.min(Math.max(0, nextPosition), maxScrollLeft); if (!animationFrameId) { animationFrameId = requestAnimationFrame(smoothScrollStep); } }; elem.addEventListener('wheel', handleWheelScroll, { passive: false }); }); });