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photoswipe

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/** * show-hide-transition.js: * * Manages initial opening or closing transition. * * If you're not planning to use transition for gallery at all, * you may set options hideAnimationDuration and showAnimationDuration to 0, * and just delete startAnimation function. * */ var _showOrHideTimeout, _showOrHide = function(item, img, out, completeFn) { if(_showOrHideTimeout) { clearTimeout(_showOrHideTimeout); } _initialZoomRunning = true; _initialContentSet = true; // dimensions of small thumbnail {x:,y:,w:}. // Height is optional, as calculated based on large image. var thumbBounds; if(item.initialLayout) { thumbBounds = item.initialLayout; item.initialLayout = null; } else { thumbBounds = _options.getThumbBoundsFn && _options.getThumbBoundsFn(_currentItemIndex); } var duration = out ? _options.hideAnimationDuration : _options.showAnimationDuration; var onComplete = function() { _stopAnimation('initialZoom'); if(!out) { _applyBgOpacity(1); if(img) { img.style.display = 'block'; } framework.addClass(template, 'pswp--animated-in'); _shout('initialZoom' + (out ? 'OutEnd' : 'InEnd')); } else { self.template.removeAttribute('style'); self.bg.removeAttribute('style'); } if(completeFn) { completeFn(); } _initialZoomRunning = false; }; // if bounds aren't provided, just open gallery without animation if(!duration || !thumbBounds || thumbBounds.x === undefined) { var finishWithoutAnimation = function() { _shout('initialZoom' + (out ? 'Out' : 'In') ); _currZoomLevel = item.initialZoomLevel; _equalizePoints(_panOffset, item.initialPosition ); _applyCurrentZoomPan(); // no transition template.style.opacity = out ? 0 : 1; _applyBgOpacity(1); onComplete(); }; finishWithoutAnimation(); return; } var startAnimation = function() { var closeWithRaf = _closedByScroll, fadeEverything = !self.currItem.src || self.currItem.loadError || _options.showHideOpacity; // apply hw-acceleration to image if(item.miniImg) { item.miniImg.style.webkitBackfaceVisibility = 'hidden'; } if(!out) { _currZoomLevel = thumbBounds.w / item.w; _panOffset.x = thumbBounds.x; _panOffset.y = thumbBounds.y - _initalWindowScrollY; self[fadeEverything ? 'template' : 'bg'].style.opacity = 0.001; _applyCurrentZoomPan(); } _registerStartAnimation('initialZoom'); if(out && !closeWithRaf) { framework.removeClass(template, 'pswp--animated-in'); } if(fadeEverything) { if(out) { framework[ (closeWithRaf ? 'remove' : 'add') + 'Class' ](template, 'pswp--animate_opacity'); } else { setTimeout(function() { framework.addClass(template, 'pswp--animate_opacity'); }, 30); } } _showOrHideTimeout = setTimeout(function() { _shout('initialZoom' + (out ? 'Out' : 'In') ); if(!out) { // "in" animation always uses CSS transitions (instead of rAF). // CSS transition work faster here, // as developer may also want to animate other things, // like ui on top of sliding area, which can be animated just via CSS _currZoomLevel = item.initialZoomLevel; _equalizePoints(_panOffset, item.initialPosition ); _applyCurrentZoomPan(); _applyBgOpacity(1); if(fadeEverything) { template.style.opacity = 1; } else { _applyBgOpacity(1); } _showOrHideTimeout = setTimeout(onComplete, duration + 20); } else { // "out" animation uses rAF only when PhotoSwipe is closed by browser scroll, to recalculate position var destZoomLevel = thumbBounds.w / item.w, initialPanOffset = { x: _panOffset.x, y: _panOffset.y }, initialZoomLevel = _currZoomLevel, initalBgOpacity = _bgOpacity, onUpdate = function(now) { if(now === 1) { _currZoomLevel = destZoomLevel; _panOffset.x = thumbBounds.x; _panOffset.y = thumbBounds.y - _currentWindowScrollY; } else { _currZoomLevel = (destZoomLevel - initialZoomLevel) * now + initialZoomLevel; _panOffset.x = (thumbBounds.x - initialPanOffset.x) * now + initialPanOffset.x; _panOffset.y = (thumbBounds.y - _currentWindowScrollY - initialPanOffset.y) * now + initialPanOffset.y; } _applyCurrentZoomPan(); if(fadeEverything) { template.style.opacity = 1 - now; } else { _applyBgOpacity( initalBgOpacity - now * initalBgOpacity ); } }; if(closeWithRaf) { _animateProp('initialZoom', 0, 1, duration, framework.easing.cubic.out, onUpdate, onComplete); } else { onUpdate(1); _showOrHideTimeout = setTimeout(onComplete, duration + 20); } } }, out ? 25 : 90); // Main purpose of this delay is to give browser time to paint and // create composite layers of PhotoSwipe UI parts (background, controls, caption, arrows). // Which avoids lag at the beginning of scale transition. }; startAnimation(); };