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-rw-r--r--themes/default/js/image.loader.js84
1 files changed, 84 insertions, 0 deletions
diff --git a/themes/default/js/image.loader.js b/themes/default/js/image.loader.js
new file mode 100644
index 000000000..cd8b9cc52
--- /dev/null
+++ b/themes/default/js/image.loader.js
@@ -0,0 +1,84 @@
+
+function ImageLoader(opts) {
+ this.opts = jQuery.extend( {
+ maxRequests: 6,
+ onChanged: jQuery.noop
+ }, opts||{} );
+}
+
+ImageLoader.prototype = {
+ loaded: 0,
+ errors: 0,
+ errorEma: 0,
+
+ pause: false,
+
+ current: [],
+ queue: [],
+ pool: [],
+
+ remaining: function() {
+ return this.current.length + this.queue.length;
+ },
+
+ add: function(urls) {
+ this.queue = this.queue.concat( urls );
+ this._fireChanged("add");
+ this._checkQueue();
+ },
+
+ clear: function() {
+ this.queue.length = 0;
+ while (this.current.length)
+ jQuery( this.current.pop() ).unbind();
+ this.loaded = this.errors = this.errorEma = 0;
+ },
+
+ pause: function(val) {
+ if (val !== undefined)
+ {
+ this.paused = val;
+ this._checkQueue();
+ }
+ return this.paused;
+ },
+
+ _checkQueue: function() {
+ while (!this.paused
+ && this.queue.length
+ && this.current.length < this.opts.maxRequests)
+ {
+ this._processOne( this.queue.shift() );
+ }
+ },
+
+ _processOne: function(url) {
+ var img = this.pool.shift() || new Image;
+ this.current.push(img);
+ var that = this;
+ jQuery(img).bind( "load error abort", function(e) {
+ //img.onload = function(e) {
+ jQuery(img).unbind();
+ img.onload=null;
+ that.current.splice(jQuery.inArray(img, that.current), 1);
+ if (e.type==="load") {
+ that.loaded++;
+ that.errorEma *= 0.9;
+ }
+ else {
+ that.errors++;
+ that.errorEma++;
+ if (that.errorEma>=20 && that.errorEma<21)
+ that.paused = true;
+ }
+ that._fireChanged(e.type, img);
+ that._checkQueue();
+ that.pool.push(img);
+ } );
+ img.src = url;
+ },
+
+ _fireChanged: function(type, img) {
+ this.opts.onChanged(type, img);
+ }
+} \ No newline at end of file