Introduction d'un callback « beforeUpload ».

[Plinn.git] / skins / fileupload.js

diff --git a/skins/fileupload.js b/skins/fileupload.js
index d862ad6..0aebb3e 100644 (file)
--- a/skins/fileupload.js
+++ b/skins/fileupload.js
@@ -1,54 +1,146 @@
-function dragenter(evt) {
+// © 2013 Benoît Pin MINES ParisTech
+var DDFileUploaderBase;
+
+(function(){
+
+DDFileUploaderBase = function(dropbox, uploadUrl) {
+       this.dropbox = dropbox;
+       this.uploadUrl = uploadUrl;
+       this.uploadQueue = [];
+       this._uploadQueueRunning = false;
+       var self = this;
+       addListener(dropbox, 'dragenter', function(evt){self.dragenter(evt);});
+       addListener(dropbox, 'dragover', function(evt){self.dragover(evt);});
+       addListener(dropbox, 'drop', function(evt){self.drop(evt);});
+};
+
+// Drag and drop
+DDFileUploaderBase.prototype.dragenter = function(evt) {
        disableDefault(evt);
        disablePropagation(evt);
-}
+};
 
-function dragover(evt) {
+DDFileUploaderBase.prototype.dragover = function(evt) {
        disableDefault(evt);
        disablePropagation(evt);
        evt = getEventObject(evt);
        var dt = evt.dataTransfer;
        dt.dropEffect = 'copy';
-}
+};
 
-
-function drop(evt) {
+DDFileUploaderBase.prototype.drop = function(evt) {
        disableDefault(evt);
        disablePropagation(evt);
        getEventObject(evt);
        var dt = evt.dataTransfer;
        dt.dropEffect = 'copy';
-       handleFiles(dt.files);
-}
-
-function handleFiles(files) {
-       for (var i = 0; i < files.length; i++) {
-               var file = files[i];
-               console.log(file.type);
-               // console.log(file);
-               // var imageType = /image.*/;
-               //      
-               // if (!file.type.match(imageType)) {
-               //   continue;
-               // }
-               //      
-               // var img = document.createElement("img");
-               // img.classList.add("obj");
-               // img.file = file;
-               // preview.appendChild(img);
-               //      
-               // var reader = new FileReader();
-               // reader.onload = (function(aImg) { return function(e) { aImg.src = e.target.result; }; })(img);
-               // reader.readAsDataURL(file);
+       this.handleFiles(dt.files);
+};
+
+// Methods about upload
+DDFileUploaderBase.prototype.handleFiles = function(files) {
+       // To be implemented by descendant.
+};
+
+
+
+DDFileUploaderBase.prototype.beforeUpload = function(item) {
+       // To be implemented by decendant.
+};
+
+
+DDFileUploaderBase.prototype.upload = function(item) {
+       // item.file must be the file to be uploaded
+       this.beforeUpload(item);
+       var reader = new FileReader();
+       var req = new XMLHttpRequest();
+       var file = item.file;
+       
+       var self = this;
+       
+       addListener(req.upload, 'progress', function(evt){self.progressHandler(evt);});
+       addListener(req, 'readystatechange',
+               function(evt) {
+                       if (req.readyState === 4) {
+                               self.uploadCompleteHandler(req);
+                       }
+               });
+
+       req.open("PUT", this.uploadUrl);
+       req.setRequestHeader("Content-Type", file.type);
+       req.setRequestHeader("X-File-Name", file.name);
+       addListener(reader, 'load',
+               function(evt){
+                       try {
+                               req.sendAsBinary(evt.target.result);
+                       }
+                       catch(e){}
+               });
+       reader.readAsBinaryString(file);
+};
+
+DDFileUploaderBase.prototype.uploadCompleteHandler = function(req) {
+       var slide = this.uploadedSlide;
+       this.uploadedSlide.removeChild(slide.label);
+    this.uploadedSlide.removeChild(slide.progressBar);
+       var fragment = getCopyOfNode(req.responseXML.documentElement.firstChild);
+       var img = fragment.getElementsByTagName('img')[0];
+       if (req.status === 200) {
+               // update
+               var existing = this.existingSlides[img.src];
+               if (existing) {
+                       existing.src = existing.src + '?' + Math.random().toString();
+               }
+               slide.img.src = '';
+               slide.img.parentNode.removeChild(slide.img);
+               slide.img = undefined;
+               slide.parentNode.removeChild(slide);
+       }
+       else if(req.status === 201) {
+               // creation
+               img.onload = function(evt) {
+                       // accelerate GC before replacing
+                       slide.img.src = '';
+                       slide.img.parentNode.removeChild(slide.img);
+                       slide.img = undefined;
+                       slide.parentNode.replaceChild(fragment, slide);
+               };
        }
-}
+       this.previewsLoaded--;
+       this.previewQueueLoadNext();
+       this.uploadQueueLoadNext();
+};
 
-function init() {
-       var dropbox = document.getElementById('dropbox');
-       addListener(dropbox, 'dragenter', dragenter);
-       addListener(dropbox, 'dragover', dragover);
-       addListener(dropbox, 'drop', drop);
-}
+DDFileUploaderBase.prototype.progressHandler = function(evt) {
+       if (evt.lengthComputable) {
+               var progress = evt.loaded / evt.total;
+               this.updateProgressBar(progress);
+               var currentOpacity = this.previewImg.style.opacity;
+               this.previewImg.style.opacity = Math.max(currentOpacity, progress);
+       }
+};
 
+// Methods about queue
+DDFileUploaderBase.prototype.uploadQueuePush = function(item) {
+       this.uploadQueue.push(item);
+       if (!this._uploadQueueRunning) {
+               this.startUploadQueue();
+       }
+};
+
+DDFileUploaderBase.prototype.startUploadQueue = function() {
+       this._uploadQueueRunning = true;
+       this.uploadQueueLoadNext();
+};
+
+DDFileUploaderBase.prototype.uploadQueueLoadNext = function() {
+       var item = this.uploadQueue.shift();
+       if (item) {
+               this.upload(item);
+       }
+       else {
+               this._uploadQueueRunning = false;
+       }
+};
 
-addListener(window, 'load', init);
\ No newline at end of file
+}());