65a2984551cd1cc6cc76731ae589b1c98093752a
[Portfolio.git] / skins / fileupload.js
1 // © 2013 Benoît Pin MINES ParisTech
2 var DDFileUploader;
3
4 (function(){
5 // nombre maximun d'image chargées en local
6 var MAX_PREVIEW = 5;
7
8 DDFileUploader = function(dropbox, uploadUrl) {
9 this.dropbox = dropbox;
10 this.uploadUrl = uploadUrl;
11 this.slideSize = 222;
12 this.progressBarMaxSize = 200; // pixels
13 this.thumbnailSize = 180;
14 this.previewQueue = [];
15 this._previewQueueRunning = false;
16 this.previewsLoaded = 0;
17 this.uploadQueue = [];
18 this._uploadQueueRunning = false;
19 var self = this;
20 addListener(dropbox, 'dragenter', function(evt){self.dragenter(evt);});
21 addListener(dropbox, 'dragover', function(evt){self.dragover(evt);});
22 addListener(dropbox, 'drop', function(evt){self.drop(evt);});
23 };
24
25 // Drag and drop
26 DDFileUploader.prototype.dragenter = function(evt) {
27 disableDefault(evt);
28 disablePropagation(evt);
29 };
30
31 DDFileUploader.prototype.dragover = function(evt) {
32 disableDefault(evt);
33 disablePropagation(evt);
34 evt = getEventObject(evt);
35 var dt = evt.dataTransfer;
36 dt.dropEffect = 'copy';
37 };
38
39 DDFileUploader.prototype.drop = function(evt) {
40 disableDefault(evt);
41 disablePropagation(evt);
42 getEventObject(evt);
43 var dt = evt.dataTransfer;
44 dt.dropEffect = 'copy';
45 this.handleFiles(dt.files);
46 };
47
48 // Methods about upload
49 DDFileUploader.prototype.handleFiles = function(files) {
50 var file, i, slide;
51 for (i = 0; i < files.length; i++) {
52 file = files[i];
53 slide = this.createSlide(file);
54 this.previewQueuePush(slide);
55 this.uploadQueuePush(slide);
56 }
57 };
58
59 DDFileUploader.prototype.upload = function(slide) {
60 var reader = new FileReader();
61 var req = new XMLHttpRequest();
62 var file = slide.file;
63 this.uploadedSlide = slide;
64 this.previewImg = slide.img;
65 this.progressBar = slide.progressBar;
66 var self = this;
67
68 addListener(req.upload, 'progress', function(evt){self.progressHandler(evt);});
69 addListener(req, 'readystatechange',
70 function(evt) {
71 if (req.readyState === 4) {
72 self.uploadCompleteHandler(req);
73 }
74 });
75
76 req.open("PUT", this.uploadUrl);
77 req.setRequestHeader("Content-Type", file.type);
78 req.setRequestHeader("X-File-Name", file.name);
79 addListener(reader, 'load',
80 function(evt){
81 try {
82 req.sendAsBinary(evt.target.result);
83 }
84 catch(e){}
85 });
86 reader.readAsBinaryString(file);
87 };
88
89 DDFileUploader.prototype.uploadCompleteHandler = function(req) {
90 var slide = this.uploadedSlide;
91 this.uploadedSlide.removeChild(slide.label);
92 this.uploadedSlide.removeChild(slide.progressBar);
93 slide.innerHTML = req.responseXML.documentElement.firstChild.data;
94 this.previewsLoaded--;
95 this.previewQueueLoadNext();
96 this.uploadQueueLoadNext();
97 };
98
99 DDFileUploader.prototype.progressHandler = function(evt) {
100 if (evt.lengthComputable) {
101 var progress = evt.loaded / evt.total;
102 this.updateProgressBar(progress);
103 var currentOpacity = this.previewImg.style.opacity;
104 this.previewImg.style.opacity = Math.max(currentOpacity, progress);
105 }
106 };
107
108 // Method about queues
109
110 DDFileUploader.prototype.previewQueuePush = function(slide) {
111 this.previewQueue.push(slide);
112 if (!this._previewQueueRunning) {
113 this.startPreviewQueue();
114 }
115 };
116
117 DDFileUploader.prototype.startPreviewQueue = function() {
118 this._previewQueueRunning = true;
119 this.previewQueueLoadNext();
120 };
121
122 DDFileUploader.prototype.previewQueueLoadNext = function() {
123 if (this.previewQueue.length && this.previewsLoaded < MAX_PREVIEW) {
124 var slide = this.previewQueue.shift();
125 console.info('previewQueueLoadNext', this.previewsLoaded, slide.file.name);
126 this.previewUploadedImage(slide);
127 this.previewsLoaded++;
128 }
129 else {
130 console.warn('previewQueueLoadNext skipped', this.previewsLoaded);
131 this._previewQueueRunning = false;
132 }
133 };
134
135 DDFileUploader.prototype.uploadQueuePush = function(slide) {
136 this.uploadQueue.push(slide);
137 if (!this._uploadQueueRunning) {
138 this.startUploadQueue();
139 }
140 };
141
142 DDFileUploader.prototype.startUploadQueue = function() {
143 this._uploadQueueRunning = true;
144 this.uploadQueueLoadNext();
145 };
146
147
148 DDFileUploader.prototype.uploadQueueLoadNext = function() {
149 var slide = this.uploadQueue.shift();
150 if (slide) {
151 this.upload(slide);
152 }
153 else {
154 this._uploadQueueRunning = false;
155 }
156 };
157
158
159 // User interface
160 DDFileUploader.prototype.createSlide = function(file) {
161 var slide = document.createElement('span');
162 slide.file = file;
163
164 var a = document.createElement('a');
165 a.href = '#';
166 a.className = 'slide';
167
168 var img = document.createElement('img');
169 img.className = 'hidden';
170 var size = this.thumbnailSize;
171 var self = this;
172 img.onload = function(evt) {
173 if (img.width > img.height) { // landscape
174 img.height = Math.round(size * img.height / img.width);
175 img.width = size;
176 }
177 else {
178 img.width = Math.round(size * img.width / img.height);
179 img.height = size;
180 }
181 img.style.marginLeft = Math.round((self.slideSize - img.width) / 2) + 'px';
182 img.style.marginTop = Math.round((self.slideSize - img.height) / 2) + 'px';
183 img.style.opacity = 0.2;
184 img.className = undefined;
185 };
186 a.appendChild(img);
187 slide.img = img;
188
189 var label = document.createElement('span');
190 slide.label = label;
191 label.className = 'label';
192 label.innerHTML = file.name;
193
194 var progressBar = document.createElement('span');
195 progressBar.className = 'upload-progress';
196 slide.progressBar = progressBar;
197
198 slide.appendChild(a);
199 slide.appendChild(progressBar);
200 slide.appendChild(label);
201 this.dropbox.appendChild(slide);
202
203 return slide;
204 };
205
206 DDFileUploader.prototype.updateProgressBar = function(progress) {
207 // 0 <= progress <= 1
208 var size = this.progressBarMaxSize * progress;
209 size = Math.round(size);
210 this.progressBar.style.width = size + 'px';
211 };
212
213 DDFileUploader.prototype.previewUploadedImage = function(slide) {
214 var reader = new FileReader();
215 var size = this.thumbnailSize;
216 var self = this;
217
218 reader.onload = function(evt) {
219 slide.img.src = evt.target.result;
220 setTimeout(function(){self.previewQueueLoadNext();}, 500);
221 };
222 reader.readAsDataURL(slide.file);
223 };
224
225 }());