Created
October 27, 2017 21:08
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Save dimsemenov/81278bc32ecab8fb1f799d97fa4c16c1 to your computer and use it in GitHub Desktop.
Before/After image viewer, will probably create a separate repo for it some day... (c)
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| img { | |
| margin: 0; | |
| padding: 0; | |
| display: block; | |
| } | |
| .ba-viewer { | |
| overflow: hidden; | |
| position: relative; | |
| width: 100%; | |
| max-width: 400px; | |
| height: auto; | |
| margin: 0 auto; | |
| touch-action: pan-y pinch-zoom; | |
| cursor: ew-resize; | |
| } | |
| .ba-viewer__before-img { | |
| width: 100%; | |
| position: absolute; | |
| } | |
| .ba-viewer__after-img { | |
| width: 100%; | |
| } | |
| .ba-viewer__after-container { | |
| position: absolute; | |
| position: relative; | |
| width: 100%; | |
| overflow: hidden; | |
| } | |
| .ba-viewer__divider { | |
| color: #FFF; | |
| position: absolute; | |
| left: 0; | |
| top: 0; | |
| width: 2px; | |
| margin-left: -1px; | |
| height: 100%; | |
| background: currentColor; | |
| will-change: transform; | |
| } | |
| .ba-viewer__divider:before, | |
| .ba-viewer__divider:after { | |
| content: ''; | |
| position: absolute; | |
| left: 0; | |
| top: 50%; | |
| border: 10px solid transparent; | |
| border-top-width: 6px; | |
| border-bottom-width: 6px; | |
| } | |
| .ba-viewer__divider:before { | |
| border-right-color: currentColor; | |
| left: -25px | |
| } | |
| .ba-viewer__divider:after { | |
| border-left-color: currentColor; | |
| left: 7px | |
| } |
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| <div class="ba-viewer"> | |
| <img draggable="false" class="ba-viewer__before-img" src="https://dummyimage.com/400x300/000/fff.png&text=image+1" /> | |
| <div class="ba-viewer__after-container"> | |
| <img draggable="false" class="ba-viewer__after-img" src="https://dummyimage.com/400x300/000/fff.png&text=image+2" /> | |
| </div> | |
| <div class="ba-viewer__divider"></div> | |
| </div> |
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| (function(window) { | |
| 'use strict'; | |
| var toggleEvent = function(el, name, fn, unbind) { | |
| var methodName = (unbind ? 'remove' : 'add') + 'EventListener'; | |
| el[methodName](name, fn, false); | |
| }; | |
| var setTransformX = function(el, x) { | |
| el.style.transform = 'translateX(' + (x )+ 'px)'; | |
| }; | |
| window.BeforeAfterViewer = function () { | |
| var self = this; | |
| var viewer; | |
| var rect; | |
| var container; | |
| var afterImage; | |
| var divider; | |
| var isPointerDown; | |
| var isMouse; | |
| self.init = function (viewerEl, pos = 0.5) { | |
| viewer = viewerEl; | |
| container = viewer.querySelector('.ba-viewer__after-container'); | |
| afterImage = viewer.querySelector('.ba-viewer__after-img'); | |
| divider = viewer.querySelector('.ba-viewer__divider'); | |
| self.position = pos; | |
| toggleEvents(); | |
| self.resize(); | |
| }; | |
| self.setPosition = function (pos /* 0 - 1 */) { | |
| if(pos < 0) { | |
| pos = 0; | |
| } else if(pos > 1) { | |
| pos = 1; | |
| } | |
| var x = rect.width * pos; | |
| setTransformX(afterImage, -x); | |
| setTransformX(container, x); | |
| setTransformX(divider, x); | |
| }; | |
| self.resize = function() { | |
| rect = viewer.getBoundingClientRect(); | |
| self.setPosition(self.position); | |
| }; | |
| function onPointerUpdate(pointerPageX) { | |
| self.setPosition( (pointerPageX - rect.left) / rect.width); | |
| } | |
| function toggleEvents(remove) { | |
| toggleEvent(window, 'resize', self.resize, remove); | |
| toggleEvent(viewer, 'mousedown', pointerDown, remove); | |
| toggleEvent(viewer, 'touchstart', pointerDown, remove); | |
| if(remove) { | |
| toggleMoveUpCancelEvents(isMouse, true); | |
| } | |
| } | |
| function toggleMoveUpCancelEvents(isMouse, remove) { | |
| if(isMouse) { | |
| toggleEvent(window, 'mousemove', pointerMove, remove); | |
| toggleEvent(window, 'mouseup', pointerUp, remove); | |
| } else { | |
| toggleEvent(window, 'touchmove', pointerMove, remove); | |
| toggleEvent(window, 'touchend', pointerUp, remove); | |
| toggleEvent(window, 'touchcancel', pointerUp, remove); | |
| } | |
| } | |
| function pointerDown(e) { | |
| if(isPointerDown) { | |
| return; | |
| } | |
| isPointerDown = true; | |
| isMouse = e.type.indexOf('mouse') > -1; | |
| if(isMouse && e.button > 0) { | |
| // drag only via left mouse button | |
| return; | |
| } | |
| onPointerUpdate(isMouse ? e.pageX : e.touches[0].pageX); | |
| toggleMoveUpCancelEvents(isMouse); | |
| } | |
| function pointerMove(e) { | |
| onPointerUpdate(isMouse ? e.pageX : e.touches[0].pageX); | |
| } | |
| function pointerUp(e) { | |
| isPointerDown = false; | |
| toggleMoveUpCancelEvents(isMouse, true); | |
| } | |
| }; | |
| })(window); |
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