497e30ac2a618be595e0d7d21a7aa257a411f10e
[Plinn.git] / skins / fileupload.js
1 // © 2013 Benoît Pin MINES ParisTech
2 var DDFileUploaderBase;
3
4 (function(){
5 // nombre maximun d'image chargées en local
6 var MAX_PREVIEW = 2;
7
8 DDFileUploaderBase = function(dropbox, uploadUrl) {
9 this.dropbox = dropbox;
10 this.uploadUrl = uploadUrl;
11 this.uploadQueue = [];
12 this._uploadQueueRunning = false;
13 var self = this;
14 addListener(dropbox, 'dragenter', function(evt){self.dragenter(evt);});
15 addListener(dropbox, 'dragover', function(evt){self.dragover(evt);});
16 addListener(dropbox, 'drop', function(evt){self.drop(evt);});
17 };
18
19 // Drag and drop
20 DDFileUploaderBase.prototype.dragenter = function(evt) {
21 disableDefault(evt);
22 disablePropagation(evt);
23 };
24
25 DDFileUploaderBase.prototype.dragover = function(evt) {
26 disableDefault(evt);
27 disablePropagation(evt);
28 evt = getEventObject(evt);
29 var dt = evt.dataTransfer;
30 dt.dropEffect = 'copy';
31 };
32
33 DDFileUploaderBase.prototype.drop = function(evt) {
34 disableDefault(evt);
35 disablePropagation(evt);
36 getEventObject(evt);
37 var dt = evt.dataTransfer;
38 dt.dropEffect = 'copy';
39 this.handleFiles(dt.files);
40 };
41
42 // Methods about upload
43 DDFileUploaderBase.prototype.handleFiles = function(files) {
44 var file, i, slide;
45 for (i = 0; i < files.length; i++) {
46 file = files[i];
47 slide = this.createSlide(file);
48 this.previewQueuePush(slide);
49 this.uploadQueuePush(slide);
50 }
51 };
52
53 DDFileUploaderBase.prototype.upload = function(slide) {
54 var reader = new FileReader();
55 var req = new XMLHttpRequest();
56 var file = slide.file;
57 this.uploadedSlide = slide;
58 this.previewImg = slide.img;
59 this.progressBar = slide.progressBar;
60 var self = this;
61
62 addListener(req.upload, 'progress', function(evt){self.progressHandler(evt);});
63 addListener(req, 'readystatechange',
64 function(evt) {
65 if (req.readyState === 4) {
66 self.uploadCompleteHandler(req);
67 }
68 });
69
70 req.open("PUT", this.uploadUrl);
71 req.setRequestHeader("Content-Type", file.type);
72 req.setRequestHeader("X-File-Name", file.name);
73 addListener(reader, 'load',
74 function(evt){
75 try {
76 req.sendAsBinary(evt.target.result);
77 }
78 catch(e){}
79 });
80 reader.readAsBinaryString(file);
81 };
82
83 DDFileUploaderBase.prototype.uploadCompleteHandler = function(req) {
84 var slide = this.uploadedSlide;
85 this.uploadedSlide.removeChild(slide.label);
86 this.uploadedSlide.removeChild(slide.progressBar);
87 var fragment = getCopyOfNode(req.responseXML.documentElement.firstChild);
88 var img = fragment.getElementsByTagName('img')[0];
89 if (req.status === 200) {
90 // update
91 var existing = this.existingSlides[img.src];
92 if (existing) {
93 existing.src = existing.src + '?' + Math.random().toString();
94 }
95 slide.img.src = '';
96 slide.img.parentNode.removeChild(slide.img);
97 slide.img = undefined;
98 slide.parentNode.removeChild(slide);
99 }
100 else if(req.status === 201) {
101 // creation
102 img.onload = function(evt) {
103 // accelerate GC before replacing
104 slide.img.src = '';
105 slide.img.parentNode.removeChild(slide.img);
106 slide.img = undefined;
107 slide.parentNode.replaceChild(fragment, slide);
108 };
109 }
110 this.previewsLoaded--;
111 this.previewQueueLoadNext();
112 this.uploadQueueLoadNext();
113 };
114
115 DDFileUploaderBase.prototype.progressHandler = function(evt) {
116 if (evt.lengthComputable) {
117 var progress = evt.loaded / evt.total;
118 this.updateProgressBar(progress);
119 var currentOpacity = this.previewImg.style.opacity;
120 this.previewImg.style.opacity = Math.max(currentOpacity, progress);
121 }
122 };
123
124 // Method about queues
125
126 DDFileUploaderBase.prototype.previewQueuePush = function(slide) {
127 this.previewQueue.push(slide);
128 if (!this._previewQueueRunning) {
129 this.startPreviewQueue();
130 }
131 };
132
133 DDFileUploaderBase.prototype.startPreviewQueue = function() {
134 this._previewQueueRunning = true;
135 this.previewQueueLoadNext();
136 };
137
138 DDFileUploaderBase.prototype.previewQueueLoadNext = function() {
139 if (this.previewQueue.length && this.previewsLoaded < MAX_PREVIEW) {
140 var slide = this.previewQueue.shift();
141 this.previewUploadedImage(slide);
142 this.previewsLoaded++;
143 }
144 else {
145 this._previewQueueRunning = false;
146 }
147 };
148
149 DDFileUploaderBase.prototype.uploadQueuePush = function(slide) {
150 this.uploadQueue.push(slide);
151 if (!this._uploadQueueRunning) {
152 this.startUploadQueue();
153 }
154 };
155
156 DDFileUploaderBase.prototype.startUploadQueue = function() {
157 this._uploadQueueRunning = true;
158 this.uploadQueueLoadNext();
159 };
160
161
162 DDFileUploaderBase.prototype.uploadQueueLoadNext = function() {
163 var slide = this.uploadQueue.shift();
164 if (slide) {
165 this.upload(slide);
166 }
167 else {
168 this._uploadQueueRunning = false;
169 }
170 };
171
172
173 // User interface
174 DDFileUploaderBase.prototype.createSlide = function(file) {
175 var slide = document.createElement('span');
176 slide.file = file;
177
178 var a = document.createElement('a');
179 a.href = '#';
180 a.className = 'slide';
181
182 var img = document.createElement('img');
183 img.className = 'hidden';
184 var size = this.thumbnailSize;
185 var self = this;
186 img.onload = function(evt) {
187 if (img.width > img.height) { // landscape
188 img.height = Math.round(size * img.height / img.width);
189 img.width = size;
190 }
191 else {
192 img.width = Math.round(size * img.width / img.height);
193 img.height = size;
194 }
195 img.style.marginLeft = Math.floor((self.slideSize - img.width) / 2) + 'px';
196 img.style.marginTop = Math.floor((self.slideSize - img.height) / 2) + 'px';
197 img.style.opacity = 0.2;
198 img.className = undefined;
199 };
200 a.appendChild(img);
201 slide.img = img;
202
203 var label = document.createElement('span');
204 slide.label = label;
205 label.className = 'label';
206 label.innerHTML = file.name;
207
208 var progressBar = document.createElement('span');
209 progressBar.className = 'upload-progress';
210 slide.progressBar = progressBar;
211
212 slide.appendChild(a);
213 slide.appendChild(progressBar);
214 slide.appendChild(label);
215 this.dropbox.appendChild(slide);
216
217 return slide;
218 };
219
220 DDFileUploaderBase.prototype.updateProgressBar = function(progress) {
221 // 0 <= progress <= 1
222 var size = this.progressBarMaxSize * progress;
223 size = Math.round(size);
224 this.progressBar.style.width = size + 'px';
225 };
226
227 DDFileUploaderBase.prototype.previewUploadedImage = function(slide) {
228 var reader = new FileReader();
229 var size = this.thumbnailSize;
230 var self = this;
231
232 reader.onload = function(evt) {
233 slide.img.src = evt.target.result;
234 setTimeout(function(){self.previewQueueLoadNext();}, 500);
235 };
236 reader.readAsDataURL(slide.file);
237 };
238
239 }());