77d7b03ddaee0e081a6c21763d18c66d6fbb3117
[Plinn.git] / skins / fileupload.js
1 // © 2013 Benoît Pin MINES ParisTech
2 var DDFileUploader;
3
4 (function(){
5
6 DDFileUploader = function(dropbox, uploadUrl) {
7 this.dropbox = dropbox;
8 this.uploadUrl = uploadUrl;
9 this.slideSize = 222;
10 this.progressBarMaxSize = 200; // pixels
11 this.thumbnailSize = 180;
12 this.previewQueue = [];
13 this._previewQueueRunning = false;
14 this.uploadQueue = [];
15 this._uploadQueueRunning = false;
16 var self = this;
17 addListener(dropbox, 'dragenter', function(evt){self.dragenter(evt);});
18 addListener(dropbox, 'dragover', function(evt){self.dragover(evt);});
19 addListener(dropbox, 'drop', function(evt){self.drop(evt);});
20 };
21
22 // Drag and drop
23 DDFileUploader.prototype.dragenter = function(evt) {
24 disableDefault(evt);
25 disablePropagation(evt);
26 };
27
28 DDFileUploader.prototype.dragover = function(evt) {
29 disableDefault(evt);
30 disablePropagation(evt);
31 evt = getEventObject(evt);
32 var dt = evt.dataTransfer;
33 dt.dropEffect = 'copy';
34 };
35
36 DDFileUploader.prototype.drop = function(evt) {
37 disableDefault(evt);
38 disablePropagation(evt);
39 getEventObject(evt);
40 var dt = evt.dataTransfer;
41 dt.dropEffect = 'copy';
42 this.handleFiles(dt.files);
43 };
44
45 // Methods about upload
46 DDFileUploader.prototype.handleFiles = function(files) {
47 var file, i, slide;
48 for (i = 0; i < files.length; i++) {
49 file = files[i];
50 slide = this.createSlide(file);
51 // this.previewQueuePush(slide);
52 // this.uploadQueuePush(slide);
53 }
54 };
55
56 DDFileUploader.prototype.upload = function(slide) {
57 var reader = new FileReader();
58 var req = new XMLHttpRequest();
59 var file = slide.file;
60 this.uploadedSlide = slide;
61 this.previewImg = slide.img;
62 this.progressBar = slide.progressBar;
63 var self = this;
64
65 addListener(req.upload, 'progress', function(evt){self.progressHandler(evt);});
66 addListener(req.upload, 'load', function(evt){self.uploadCompleteHandler(evt);});
67
68 req.open("PUT", this.uploadUrl + '/' + file.name);
69 req.setRequestHeader("Content-Type", file.type);
70 addListener(reader, 'load',
71 function(evt){
72 console.info('load');
73 try {
74 req.sendAsBinary(evt.target.result);
75 }
76 catch(e){}
77 });
78 reader.readAsBinaryString(file);
79 };
80
81 DDFileUploader.prototype.uploadCompleteHandler = function(evt) {
82 var slide = this.uploadedSlide;
83 this.uploadedSlide.removeChild(slide.label);
84 this.uploadedSlide.removeChild(slide.progressBar);
85 this.uploadQueueLoadNext();
86 };
87
88 DDFileUploader.prototype.progressHandler = function(evt) {
89 if (evt.lengthComputable) {
90 var progress = evt.loaded / evt.total;
91 this.updateProgressBar(progress);
92 var currentOpacity = this.previewImg.style.opacity;
93 this.previewImg.style.opacity = Math.max(currentOpacity, progress);
94 }
95 };
96
97 // Method about queues
98
99 DDFileUploader.prototype.previewQueuePush = function(slide) {
100 this.previewQueue.push(slide);
101 if (!this._previewQueueRunning) {
102 this.startPreviewQueue();
103 }
104 };
105
106 DDFileUploader.prototype.startPreviewQueue = function() {
107 this._previewQueueRunning = true;
108 this.previewQueueLoadNext();
109 };
110
111 DDFileUploader.prototype.previewQueueLoadNext = function() {
112 var slide = this.previewQueue.shift();
113 if (slide) {
114 this.previewUploadedImage(slide);
115 }
116 else {
117 this._previewQueueRunning = false;
118 }
119 };
120
121 DDFileUploader.prototype.uploadQueuePush = function(slide) {
122 this.uploadQueue.push(slide);
123 if (!this._uploadQueueRunning) {
124 this.startUploadQueue();
125 }
126 };
127
128 DDFileUploader.prototype.startUploadQueue = function() {
129 this._uploadQueueRunning = true;
130 this.uploadQueueLoadNext();
131 };
132
133
134 DDFileUploader.prototype.uploadQueueLoadNext = function() {
135 var slide = this.uploadQueue.shift();
136 if (slide) {
137 this.upload(slide);
138 }
139 else {
140 this._uploadQueueRunning = false;
141 }
142 };
143
144
145 // User interface
146 DDFileUploader.prototype.createSlide = function(file) {
147 var slide = document.createElement('span');
148 slide.file = file;
149
150 var a = document.createElement('a');
151 a.href = '#';
152 a.className = 'slide';
153
154 var img = document.createElement('img');
155 img.className = 'hidden';
156 var size = this.thumbnailSize;
157 var self = this;
158 img.onload = function(evt) {
159 if (img.width > img.height) { // landscape
160 img.height = Math.round(size * img.height / img.width);
161 img.width = size;
162 }
163 else {
164 img.width = Math.round(size * img.width / img.height);
165 img.height = size;
166 }
167 img.style.marginLeft = Math.round((self.slideSize - img.width) / 2) + 'px';
168 img.style.marginTop = Math.round((self.slideSize - img.height) / 2) + 'px';
169 img.style.opacity = 0.2;
170 img.className = undefined;
171 };
172 a.appendChild(img);
173 slide.img = img;
174
175 var label = document.createElement('span');
176 slide.label = label;
177 label.className = 'label';
178 label.innerHTML = file.name;
179
180 var progressBar = document.createElement('span');
181 progressBar.className = 'upload-progress';
182 slide.progressBar = progressBar;
183
184 slide.appendChild(a);
185 slide.appendChild(progressBar);
186 slide.appendChild(label);
187 this.dropbox.appendChild(slide);
188
189 return slide;
190 };
191
192 DDFileUploader.prototype.updateProgressBar = function(progress) {
193 // 0 <= progress <= 1
194 var size = this.progressBarMaxSize * progress;
195 size = Math.round(size);
196 this.progressBar.style.width = size + 'px';
197 };
198
199 DDFileUploader.prototype.previewUploadedImage = function(slide) {
200 var reader = new FileReader();
201 var size = this.thumbnailSize;
202 var self = this;
203
204 reader.onload = function(evt) {
205 slide.img.src = evt.target.result;
206 setTimeout(function(){self.previewQueueLoadNext();}, 500);
207 };
208 reader.readAsDataURL(slide.file);
209 };
210
211 }());