source: trunk/www.guidonia.net/wp/wp-includes/js/swfupload/plugins/swfupload.queue.js@ 44

/*
        Queue Plug-in
        
        Features:
                *Adds a cancelQueue() method for cancelling the entire queue.
                *All queued files are uploaded when startUpload() is called.
                *If false is returned from uploadComplete then the queue upload is stopped.
                 If false is not returned (strict comparison) then the queue upload is continued.
                *Adds a QueueComplete event that is fired when all the queued files have finished uploading.
                 Set the event handler with the queue_complete_handler setting.
                
        */

var SWFUpload;
if (typeof(SWFUpload) === "function") {
        SWFUpload.queue = {};
        
        SWFUpload.prototype.initSettings = (function (oldInitSettings) {
                return function () {
                        if (typeof(oldInitSettings) === "function") {
                                oldInitSettings.call(this);
                        }
                        
                        this.queueSettings = {};
                        
                        this.queueSettings.queue_cancelled_flag = false;
                        this.queueSettings.queue_upload_count = 0;
                        
                        this.queueSettings.user_upload_complete_handler = this.settings.upload_complete_handler;
                        this.queueSettings.user_upload_start_handler = this.settings.upload_start_handler;
                        this.settings.upload_complete_handler = SWFUpload.queue.uploadCompleteHandler;
                        this.settings.upload_start_handler = SWFUpload.queue.uploadStartHandler;
                        
                        this.settings.queue_complete_handler = this.settings.queue_complete_handler || null;
                };
        })(SWFUpload.prototype.initSettings);

        SWFUpload.prototype.startUpload = function (fileID) {
                this.queueSettings.queue_cancelled_flag = false;
                this.callFlash("StartUpload", [fileID]);
        };

        SWFUpload.prototype.cancelQueue = function () {
                this.queueSettings.queue_cancelled_flag = true;
                this.stopUpload();
                
                var stats = this.getStats();
                while (stats.files_queued > 0) {
                        this.cancelUpload();
                        stats = this.getStats();
                }
        };
        
        SWFUpload.queue.uploadStartHandler = function (file) {
                var returnValue;
                if (typeof(this.queueSettings.user_upload_start_handler) === "function") {
                        returnValue = this.queueSettings.user_upload_start_handler.call(this, file);
                }
                
                // To prevent upload a real "FALSE" value must be returned, otherwise default to a real "TRUE" value.
                returnValue = (returnValue === false) ? false : true;
                
                this.queueSettings.queue_cancelled_flag = !returnValue;

                return returnValue;
        };
        
        SWFUpload.queue.uploadCompleteHandler = function (file) {
                var user_upload_complete_handler = this.queueSettings.user_upload_complete_handler;
                var continueUpload;
                
                if (file.filestatus === SWFUpload.FILE_STATUS.COMPLETE) {
                        this.queueSettings.queue_upload_count++;
                }

                if (typeof(user_upload_complete_handler) === "function") {
                        continueUpload = (user_upload_complete_handler.call(this, file) === false) ? false : true;
                } else if (file.filestatus === SWFUpload.FILE_STATUS.QUEUED) {
                        // If the file was stopped and re-queued don't restart the upload
                        continueUpload = false;
                } else {
                        continueUpload = true;
                }
                
                if (continueUpload) {
                        var stats = this.getStats();
                        if (stats.files_queued > 0 && this.queueSettings.queue_cancelled_flag === false) {
                                this.startUpload();
                        } else if (this.queueSettings.queue_cancelled_flag === false) {
                                this.queueEvent("queue_complete_handler", [this.queueSettings.queue_upload_count]);
                                this.queueSettings.queue_upload_count = 0;
                        } else {
                                this.queueSettings.queue_cancelled_flag = false;
                                this.queueSettings.queue_upload_count = 0;
                        }
                }
        };
}