Refactoring, commentaires.

[Plinn.git] / skins / fileupload.js

diff --git a/skins/fileupload.js b/skins/fileupload.js
index d862ad6..e467281 100644 (file)
--- a/skins/fileupload.js
+++ b/skins/fileupload.js
@@ -1,54 +1,136 @@
-function dragenter(evt) {
+// © 2013 Benoît Pin MINES ParisTech
+var DDFileUploader;
+
+(function(){
+
+DDFileUploader = function(dropbox, uploadUrl) {
+       this.dropbox = dropbox;
+       this.uploadUrl = uploadUrl;
+       this.slideSize = 222;
+       this.progressBarMaxSize = 200; // pixels
+       this.thumbnailSize = 180;
+       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
+DDFileUploader.prototype.dragenter = function(evt) {
        disableDefault(evt);
        disablePropagation(evt);
-}
+};
 
-function dragover(evt) {
+DDFileUploader.prototype.dragover = function(evt) {
        disableDefault(evt);
        disablePropagation(evt);
        evt = getEventObject(evt);
        var dt = evt.dataTransfer;
        dt.dropEffect = 'copy';
-}
-
+};
 
-function drop(evt) {
+DDFileUploader.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
+DDFileUploader.prototype.handleFiles = function(files) {
+       var file, i;
+       for (i = 0; i < files.length; i++) {
+               file = files[i];
+               this.createSlide();
+               this.previewUploadedImage(file);
+               this.upload(file);
        }
-}
+};
+
+DDFileUploader.prototype.upload = function(file) {
+       var reader = new FileReader();
+       var req = new XMLHttpRequest();
+       var self = this;
+       
+       addListener(req.upload, 'progress', function(evt){self.progressHandler(evt);});
+       addListener(req.upload, 'load', function(evt){self.uploadCompleteHandler(evt);});
+
+       req.open("PUT", this.uploadUrl + '/' + file.name);
+       req.setRequestHeader("Content-Type", file.type);
+       addListener(reader, 'load', function(evt){req.sendAsBinary(evt.target.result);});
+       reader.readAsBinaryString(file);
+};
+
+DDFileUploader.prototype.uploadCompleteHandler = function(evt) {
+       this.progressBar.parentNode.removeChild(this.progressBar);
+};
+
+DDFileUploader.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);
+       }
+};
+
+// User interface
+DDFileUploader.prototype.createSlide = function() {
+       var slide = document.createElement('span');
+
+       var a = document.createElement('a');
+       a.href = '#';
+       a.className = 'slide';
+
+       var img = document.createElement('img');
+       this.previewImg = img;
+       var size = this.thumbnailSize;
+       var self = this;
+       img.onload = function(evt) {
+               if (img.width > img.height) { // landscape
+                       img.height = Math.round(size * img.height / img.width);
+                       img.width = size;
+               }
+               else {
+                       img.width = Math.round(size * img.width / img.height);
+                       img.height = size;
+               }
+               img.style.marginLeft = Math.round((self.slideSize - img.width) / 2) + 'px';
+               img.style.marginTop = Math.round((self.slideSize - img.height) / 2) + 'px';
+               img.style.opacity = 0.2;
+               img.className = undefined;
+       };
+       a.appendChild(img);
+
+       var progressBar = document.createElement('span');
+       progressBar.className = 'upload-progress';
+
+       slide.appendChild(a);
+       slide.appendChild(progressBar);
+       this.progressBar = progressBar;
+       this.dropbox.appendChild(slide);
+};
 
-function init() {
-       var dropbox = document.getElementById('dropbox');
-       addListener(dropbox, 'dragenter', dragenter);
-       addListener(dropbox, 'dragover', dragover);
-       addListener(dropbox, 'drop', drop);
-}
+DDFileUploader.prototype.updateProgressBar = function(progress) {
+       // 0 <= progress <= 1
+       var size = this.progressBarMaxSize * progress;
+       size = Math.round(size);
+       this.progressBar.style.width = size + 'px';
+};
 
+DDFileUploader.prototype.previewUploadedImage = function(file) {
+       var reader = new FileReader();
+       var img = this.previewImg;
+       var size = this.thumbnailSize;
+       
+       img.className = 'hidden';
+       
+       reader.onload = function(evt) {
+               img.src = evt.target.result;
+       };
+       reader.readAsDataURL(file);
+};
 
-addListener(window, 'load', init);
\ No newline at end of file
+}());