Gestion affichage lors de l'écrasement.
[Plinn.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 = 2;
7 var isThumbnail = /.*\/getThumbnail$/;
8
9 DDFileUploader = function(dropbox, uploadUrl) {
10 this.dropbox = dropbox;
11 this.existingSlides = this.indexExistingSlides();
12 this.uploadUrl = uploadUrl;
13 this.slideSize = 222;
14 this.progressBarMaxSize = 200; // pixels
15 this.thumbnailSize = 180;
16 this.previewQueue = [];
17 this._previewQueueRunning = false;
18 this.previewsLoaded = 0;
19 this.uploadQueue = [];
20 this._uploadQueueRunning = false;
21 var self = this;
22 addListener(dropbox, 'dragenter', function(evt){self.dragenter(evt);});
23 addListener(dropbox, 'dragover', function(evt){self.dragover(evt);});
24 addListener(dropbox, 'drop', function(evt){self.drop(evt);});
25 };
26
27 DDFileUploader.prototype.indexExistingSlides = function() {
28 var images = this.dropbox.getElementsByTagName('img');
29 var i;
30 var index = [];
31 for (i=0 ; i < images.length ; i++) {
32 if (isThumbnail.test(images[i].src)) {
33 index[images[i].src] = images[i];
34 }
35 }
36 return index;
37 };
38
39 // Drag and drop
40 DDFileUploader.prototype.dragenter = function(evt) {
41 disableDefault(evt);
42 disablePropagation(evt);
43 };
44
45 DDFileUploader.prototype.dragover = function(evt) {
46 disableDefault(evt);
47 disablePropagation(evt);
48 evt = getEventObject(evt);
49 var dt = evt.dataTransfer;
50 dt.dropEffect = 'copy';
51 };
52
53 DDFileUploader.prototype.drop = function(evt) {
54 disableDefault(evt);
55 disablePropagation(evt);
56 getEventObject(evt);
57 var dt = evt.dataTransfer;
58 dt.dropEffect = 'copy';
59 this.handleFiles(dt.files);
60 };
61
62 // Methods about upload
63 DDFileUploader.prototype.handleFiles = function(files) {
64 var file, i, slide;
65 for (i = 0; i < files.length; i++) {
66 file = files[i];
67 slide = this.createSlide(file);
68 this.previewQueuePush(slide);
69 this.uploadQueuePush(slide);
70 }
71 };
72
73 DDFileUploader.prototype.upload = function(slide) {
74 var reader = new FileReader();
75 var req = new XMLHttpRequest();
76 var file = slide.file;
77 this.uploadedSlide = slide;
78 this.previewImg = slide.img;
79 this.progressBar = slide.progressBar;
80 var self = this;
81
82 addListener(req.upload, 'progress', function(evt){self.progressHandler(evt);});
83 addListener(req, 'readystatechange',
84 function(evt) {
85 if (req.readyState === 4) {
86 self.uploadCompleteHandler(req);
87 }
88 });
89
90 req.open("PUT", this.uploadUrl);
91 req.setRequestHeader("Content-Type", file.type);
92 req.setRequestHeader("X-File-Name", file.name);
93 addListener(reader, 'load',
94 function(evt){
95 try {
96 req.sendAsBinary(evt.target.result);
97 }
98 catch(e){}
99 });
100 reader.readAsBinaryString(file);
101 };
102
103 DDFileUploader.prototype.uploadCompleteHandler = function(req) {
104 var slide = this.uploadedSlide;
105 this.uploadedSlide.removeChild(slide.label);
106 this.uploadedSlide.removeChild(slide.progressBar);
107 var fragment = getCopyOfNode(req.responseXML.documentElement.firstChild);
108 var img = fragment.getElementsByTagName('img')[0];
109 if (req.status === 200) {
110 // update
111 var existing = this.existingSlides[img.src];
112 if (existing) {
113 existing.src = existing.src + '?' + Math.random().toString();
114 }
115 slide.img.src = '';
116 slide.img.parentNode.removeChild(slide.img);
117 slide.img = undefined;
118 slide.parentNode.removeChild(slide);
119 }
120 else if(req.status === 201) {
121 // creation
122 img.onload = function(evt) {
123 // accelerate GC before replacing
124 slide.img.src = '';
125 slide.img.parentNode.removeChild(slide.img);
126 slide.img = undefined;
127 slide.parentNode.replaceChild(fragment, slide);
128 };
129 }
130 this.previewsLoaded--;
131 this.previewQueueLoadNext();
132 this.uploadQueueLoadNext();
133 };
134
135 DDFileUploader.prototype.progressHandler = function(evt) {
136 if (evt.lengthComputable) {
137 var progress = evt.loaded / evt.total;
138 this.updateProgressBar(progress);
139 var currentOpacity = this.previewImg.style.opacity;
140 this.previewImg.style.opacity = Math.max(currentOpacity, progress);
141 }
142 };
143
144 // Method about queues
145
146 DDFileUploader.prototype.previewQueuePush = function(slide) {
147 this.previewQueue.push(slide);
148 if (!this._previewQueueRunning) {
149 this.startPreviewQueue();
150 }
151 };
152
153 DDFileUploader.prototype.startPreviewQueue = function() {
154 this._previewQueueRunning = true;
155 this.previewQueueLoadNext();
156 };
157
158 DDFileUploader.prototype.previewQueueLoadNext = function() {
159 if (this.previewQueue.length && this.previewsLoaded < MAX_PREVIEW) {
160 var slide = this.previewQueue.shift();
161 this.previewUploadedImage(slide);
162 this.previewsLoaded++;
163 }
164 else {
165 this._previewQueueRunning = false;
166 }
167 };
168
169 DDFileUploader.prototype.uploadQueuePush = function(slide) {
170 this.uploadQueue.push(slide);
171 if (!this._uploadQueueRunning) {
172 this.startUploadQueue();
173 }
174 };
175
176 DDFileUploader.prototype.startUploadQueue = function() {
177 this._uploadQueueRunning = true;
178 this.uploadQueueLoadNext();
179 };
180
181
182 DDFileUploader.prototype.uploadQueueLoadNext = function() {
183 var slide = this.uploadQueue.shift();
184 if (slide) {
185 this.upload(slide);
186 }
187 else {
188 this._uploadQueueRunning = false;
189 }
190 };
191
192
193 // User interface
194 DDFileUploader.prototype.createSlide = function(file) {
195 var slide = document.createElement('span');
196 slide.file = file;
197
198 var a = document.createElement('a');
199 a.href = '#';
200 a.className = 'slide';
201
202 var img = document.createElement('img');
203 img.className = 'hidden';
204 var size = this.thumbnailSize;
205 var self = this;
206 img.onload = function(evt) {
207 if (img.width > img.height) { // landscape
208 img.height = Math.round(size * img.height / img.width);
209 img.width = size;
210 }
211 else {
212 img.width = Math.round(size * img.width / img.height);
213 img.height = size;
214 }
215 img.style.marginLeft = Math.floor((self.slideSize - img.width) / 2) + 'px';
216 img.style.marginTop = Math.floor((self.slideSize - img.height) / 2) + 'px';
217 img.style.opacity = 0.2;
218 img.className = undefined;
219 };
220 a.appendChild(img);
221 slide.img = img;
222
223 var label = document.createElement('span');
224 slide.label = label;
225 label.className = 'label';
226 label.innerHTML = file.name;
227
228 var progressBar = document.createElement('span');
229 progressBar.className = 'upload-progress';
230 slide.progressBar = progressBar;
231
232 slide.appendChild(a);
233 slide.appendChild(progressBar);
234 slide.appendChild(label);
235 this.dropbox.appendChild(slide);
236
237 return slide;
238 };
239
240 DDFileUploader.prototype.updateProgressBar = function(progress) {
241 // 0 <= progress <= 1
242 var size = this.progressBarMaxSize * progress;
243 size = Math.round(size);
244 this.progressBar.style.width = size + 'px';
245 };
246
247 DDFileUploader.prototype.previewUploadedImage = function(slide) {
248 var reader = new FileReader();
249 var size = this.thumbnailSize;
250 var self = this;
251
252 reader.onload = function(evt) {
253 slide.img.src = evt.target.result;
254 setTimeout(function(){self.previewQueueLoadNext();}, 500);
255 };
256 reader.readAsDataURL(slide.file);
257 };
258
259 }());