optimisation empreinte mémoire.

[Portfolio.git] / skins / fileupload.js

diff --git a/skins/fileupload.js b/skins/fileupload.js
index 97b5443..c202bfe 100644 (file)
--- a/skins/fileupload.js
+++ b/skins/fileupload.js
@@ -2,15 +2,27 @@
 var DDFileUploader;
 
 (function(){
 var DDFileUploader;
 
 (function(){

+// nombre maximun d'image chargées en local
+var MAX_PREVIEW = 2;

 
 

-DDFileUploader = function(dropbox) {
+DDFileUploader = function(dropbox, uploadUrl) {

        this.dropbox = dropbox;
        this.dropbox = dropbox;

-       var thisDDFU = this;
-       addListener(dropbox, 'dragenter', function(evt){thisDDFU.dragenter(evt);});
-       addListener(dropbox, 'dragover', function(evt){thisDDFU.dragover(evt);});
-       addListener(dropbox, 'drop', function(evt){thisDDFU.drop(evt);});
+       this.uploadUrl = uploadUrl;
+       this.slideSize = 222;
+       this.progressBarMaxSize = 200; // pixels
+       this.thumbnailSize = 180;
+       this.previewQueue = [];
+       this._previewQueueRunning = false;
+       this.previewsLoaded = 0;
+       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

 DDFileUploader.prototype.dragenter = function(evt) {
        disableDefault(evt);
        disablePropagation(evt);
 DDFileUploader.prototype.dragenter = function(evt) {
        disableDefault(evt);
        disablePropagation(evt);


@@ -24,7 +36,6 @@ DDFileUploader.prototype.dragover = function(evt) {
        dt.dropEffect = 'copy';
 };
 
        dt.dropEffect = 'copy';
 };
 

-

 DDFileUploader.prototype.drop = function(evt) {
        disableDefault(evt);
        disablePropagation(evt);
 DDFileUploader.prototype.drop = function(evt) {
        disableDefault(evt);
        disablePropagation(evt);


@@ -34,12 +45,187 @@ DDFileUploader.prototype.drop = function(evt) {
        this.handleFiles(dt.files);
 };
 
        this.handleFiles(dt.files);
 };
 

+// Methods about upload

 DDFileUploader.prototype.handleFiles = function(files) {
 DDFileUploader.prototype.handleFiles = function(files) {

-       var file, i;
+       var file, i, slide;

        for (i = 0; i < files.length; i++) {
                file = files[i];
        for (i = 0; i < files.length; i++) {
                file = files[i];

-               console.log(file.type);
+               slide = this.createSlide(file);
+        this.previewQueuePush(slide);
+        this.uploadQueuePush(slide);
+       }
+};
+
+DDFileUploader.prototype.upload = function(slide) {
+       var reader = new FileReader();
+       var req = new XMLHttpRequest();
+       var file = slide.file;
+       this.uploadedSlide = slide;
+       this.previewImg = slide.img;
+       this.progressBar = slide.progressBar;
+       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);
+};
+
+DDFileUploader.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];
+       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();
+};
+
+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);
+       }
+};
+
+// Method about queues
+
+DDFileUploader.prototype.previewQueuePush = function(slide) {
+       this.previewQueue.push(slide);
+       if (!this._previewQueueRunning) {
+               this.startPreviewQueue();
+       }
+};
+
+DDFileUploader.prototype.startPreviewQueue = function() {
+       this._previewQueueRunning = true;
+       this.previewQueueLoadNext();
+};
+
+DDFileUploader.prototype.previewQueueLoadNext = function() {
+       if (this.previewQueue.length && this.previewsLoaded < MAX_PREVIEW) {
+               var slide = this.previewQueue.shift();
+               this.previewUploadedImage(slide);
+               this.previewsLoaded++;
+       }
+       else {
+               this._previewQueueRunning = false;
+       }
+};
+
+DDFileUploader.prototype.uploadQueuePush = function(slide) {
+       this.uploadQueue.push(slide);
+       if (!this._uploadQueueRunning) {
+               this.startUploadQueue();
+       }
+};
+
+DDFileUploader.prototype.startUploadQueue = function() {
+       this._uploadQueueRunning = true;
+       this.uploadQueueLoadNext();
+};
+
+
+DDFileUploader.prototype.uploadQueueLoadNext = function() {
+       var slide = this.uploadQueue.shift();
+       if (slide) {
+               this.upload(slide);

        }
        }

+       else {
+               this._uploadQueueRunning = false;
+       }
+};
+
+
+// User interface
+DDFileUploader.prototype.createSlide = function(file) {
+       var slide = document.createElement('span');
+       slide.file = file;
+
+       var a = document.createElement('a');
+       a.href = '#';
+       a.className = 'slide';
+
+       var img = document.createElement('img');
+       img.className = 'hidden';
+       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.floor((self.slideSize - img.width) / 2) + 'px';
+               img.style.marginTop = Math.floor((self.slideSize - img.height) / 2) + 'px';
+               img.style.opacity = 0.2;
+               img.className = undefined;
+       };
+       a.appendChild(img);
+       slide.img = img;
+       
+       var label = document.createElement('span');
+       slide.label = label;
+       label.className = 'label';
+       label.innerHTML = file.name;
+
+       var progressBar = document.createElement('span');
+       progressBar.className = 'upload-progress';
+       slide.progressBar = progressBar;
+
+       slide.appendChild(a);
+       slide.appendChild(progressBar);
+       slide.appendChild(label);
+       this.dropbox.appendChild(slide);
+       
+       return slide;
+};
+
+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(slide) {
+       var reader = new FileReader();
+       var size = this.thumbnailSize;
+       var self = this;
+       
+       reader.onload = function(evt) {
+               slide.img.src = evt.target.result;
+               setTimeout(function(){self.previewQueueLoadNext();}, 500);
+       };
+       reader.readAsDataURL(slide.file);

 };
 
 }());
 };
 
 }());