mirror of
https://github.com/flynx/ImageGrid.git
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86 lines
2.3 KiB
JavaScript
Executable File
86 lines
2.3 KiB
JavaScript
Executable File
/**********************************************************************
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*
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*
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*
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**********************************************************************/
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//var DEBUG = DEBUG != null ? DEBUG : true
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//
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var IMAGE_CACHE = []
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/*********************************************************************/
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// TODO add global cache...
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// - manage cache by number and preview size...
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// - keep in biggish...
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// NOTE: this will always overwrite the previous cache set for a ribbon...
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// NOTE: it appears that sorting images by priority before loading them
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// to cache has little or no effect on the order they are
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// loaded/rendered...
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// NOTE: this is not meant to be a real cache, rather a que for the OS and
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// backend/webkit on what's next...
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//
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// XXX this appears to actually make things slow and laggy...
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function preCacheRibbonImages(ribbon){
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var deferred = $.Deferred()
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setTimeout(function(){
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var i = getRibbonIndex(ribbon)
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var size = getVisibleImageSize('max')
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var screen_size = getScreenWidthInImages(getVisibleImageSize())
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// XXX needs tuning...
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var cache_frame_size = (screen_size * CONFIG.load_screens)
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var images = ribbon.find('.image')
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var first = getImageGID(images.first())
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var last = getImageGID(images.last())
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var gids = getGIDsAfter(-cache_frame_size, first, i)
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.concat(getGIDsAfter(cache_frame_size, last, i))
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var cache = []
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IMAGE_CACHE[i] = cache
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$.each(gids, function(i, e){
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var img = new Image()
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img.src = getBestPreview(e, size).url
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cache.push(img)
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})
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deferred.resolve(cache)
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}, 0)
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return deferred
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}
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function preCacheAllRibbons(){
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$('.ribbon').each(function(){
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preCacheRibbonImages($(this))
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})
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return IMAGE_CACHE
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}
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/*********************************************************************/
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function setupImageCache(viewer){
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console.log('Image cache: setup...')
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return viewer
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.on('reloadedRibbon updatedRibbon', function(evt, ribbon){
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window.DEBUG
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&& console.log('>>> (ribbon:', getRibbonIndex(ribbon), ') Updating cache...')
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preCacheRibbonImages(ribbon)
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})
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}
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SETUP_BINDINGS.push(setupImageCache)
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/**********************************************************************
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* vim:set ts=4 sw=4 : */
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