mirror of
https://github.com/flynx/ImageGrid.git
synced 2025-11-03 04:40:10 +00:00
246 lines
6.7 KiB
JavaScript
Executable File
246 lines
6.7 KiB
JavaScript
Executable File
/**********************************************************************
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*
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*
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*
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**********************************************************************/
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((typeof define)[0]=='u'?function(f){module.exports=f(require)}:define)
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(function(require){ var module={} // make module AMD/node compatible...
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/*********************************************************************/
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var actions = require('lib/actions')
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var features = require('lib/features')
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var core = require('features/core')
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/*********************************************************************/
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var PreCacheActions = actions.Actions({
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config: {
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// How many non-adjacent images to preload...
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'preload-radius': 5,
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// Sources to preload...
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'preload-sources': ['bookmark', 'marked'],
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},
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// NOTE: this will not work from chrome when loading from a local fs...
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// XXX experimental...
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startCacheWorker: ['Interface/',
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function(){
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// a worker is started already...
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if(this.cacheWorker != null){
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return
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}
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var b = new Blob([[
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'addEventListener(\'message\', function(e) {',
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' var urls = e.data',
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' urls = urls.constructor !== Array ? [urls] : urls',
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' var l = urls.length',
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' urls.forEach(function(url){',
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' var xhr = new XMLHttpRequest()',
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' xhr.responseType = \'blob\'',
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/*
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' xhr.onload = xhr.onerror = function(){',
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' l -= 1',
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' if(l <= 0){',
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' postMessage({status: \'done.\', urls: urls})',
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' }',
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' }',
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*/
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' xhr.open(\'GET\', url, true)',
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' xhr.send()',
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' })',
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'}, false)',
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].join('\n')])
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var url = URL.createObjectURL(b)
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this.cacheWorker = new Worker(url)
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this.cacheWorker.url = url
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}],
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stopCacheWorker: ['Interface/',
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function(){
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if(this.cacheWorker){
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this.cacheWorker.terminate()
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URL.revokeObjectURL(this.cacheWorker.url)
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delete this.cacheWorker
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}
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}],
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// Pre-load images...
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//
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// Sources supported:
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// <tag> - pre-load images tagged with <tag>
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// (default: ['bookmark', 'marked'])
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// <ribbon-gid> - pre-cache from a specific ribbon
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// 'ribbon' - pre-cache from current ribbon
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// 'order' - pre-cache from images in order
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//
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// NOTE: workers when loaded from file:// in a browser context
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// will not have access to local images...
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//
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// XXX need a clear strategy to run this...
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// XXX might be a good idea to make the worker queue the lists...
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// ...this will need careful prioritization logic...
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// - avoid loading the same url too often
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// - load the most probable urls first
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// - next targets
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// - next/prev
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// .preCacheJumpTargets(target, 'ribbon', this.screenwidth)
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// - next/prev marked/bookmarked/order
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// .preCacheJumpTargets(target, 'marked')
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// .preCacheJumpTargets(target, 'bookmarked')
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// .preCacheJumpTargets(target, 'order')
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// - next/prev screen
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// .preCacheJumpTargets(target, 'ribbon',
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// this.config['preload-radius'] * this.screenwidth)
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// - next/prev ribbon
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// .preCacheJumpTargets(target, this.data.getRibbon(target, 1))
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// .preCacheJumpTargets(target, this.data.getRibbon(target, -1))
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// - next blocks
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// - what resize ribbon does...
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// XXX coordinate this with .resizeRibbon(..)
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// XXX make this support an explicit list of gids....
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// XXX should this be here???
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preCacheJumpTargets: ['- Interface/Pre-cache potential jump target images',
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function(target, sources, radius, size){
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target = target instanceof jQuery
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? this.ribbons.elemGID(target)
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// NOTE: data.getImage(..) can return null at start or end
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// of ribbon, thus we need to account for this...
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: (this.data.getImage(target)
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|| this.data.getImage(target, 'after'))
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sources = sources || this.config['preload-sources'] || ['bookmark', 'marked']
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sources = sources.constructor !== Array ? [sources] : sources
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radius = radius || this.config['preload-radius'] || 9
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var that = this
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// get preview...
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var _getPreview = function(c){
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return that.images[c]
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&& that.images.getBestPreview(c, size, true).url
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}
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// get a set of paths...
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// NOTE: we are also ordering the resulting gids by their
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// distance from target...
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var _get = function(i, lst, source, radius, oddity, step){
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var found = oddity
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var max = source.length
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for(var j = i+step; (step > 0 && j < max) || (step < 0 && j >= 0); j += step){
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var c = source[j]
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if(c == null || that.images[c] == null){
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continue
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}
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// build the URL...
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lst[found] = _getPreview(c)
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found += 2
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if(found >= radius*2){
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break
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}
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}
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}
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// run the actual preload...
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var _run = function(){
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sources.forEach(function(tag){
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// order...
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if(tag == 'order'){
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var source = that.data.order
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// current ribbon...
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}else if(tag == 'ribbon'){
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var source = that.data.ribbons[that.data.getRibbon()]
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// ribbon-gid...
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} else if(tag in that.data.ribbons){
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var source = that.data.ribbons[tag]
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// nothing tagged then nothing to do...
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} else if(that.data.tags == null
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|| that.data.tags[tag] == null
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|| that.data.tags[tag].length == 0){
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return
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// tag...
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} else {
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var source = that.data.tags[tag]
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}
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size = size || that.ribbons.getVisibleImageSize()
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var i = that.data.order.indexOf(target)
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var lst = []
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// get the list of URLs before and after current...
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_get(i ,lst, source, radius, 0, 1)
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_get(i, lst, source, radius, 1, -1)
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// get target preview in case the target is not loaded...
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var p = _getPreview(that.data.getImage(target))
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p && lst.splice(0, 0, p)
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// web worker...
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if(that.cacheWorker != null){
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that.cacheWorker.postMessage(lst)
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// async inline...
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} else {
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// do the actual preloading...
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lst.forEach(function(url){
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var img = new Image()
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img.src = url
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})
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}
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})
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}
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if(that.cacheWorker != null){
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_run()
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} else {
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setTimeout(_run, 0)
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}
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}],
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})
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var PreCache =
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module.PreCache = core.ImageGridFeatures.Feature({
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title: '',
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doc: '',
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tag: 'ui-partial-ribbons-precache',
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depends: [
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'ui',
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],
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actions: PreCacheActions,
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handlers: [
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['focusImage.post',
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function(_, target){
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this.preCacheJumpTargets(target) }],
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/*/
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['resizing.pre',
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function(unit, size){
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this.preCacheJumpTargets() }],
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//*/
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],
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})
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/**********************************************************************
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* vim:set ts=4 sw=4 : */ return module })
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