jslint
[Portfolio.git] / skins / portfolio_upload.js
1 // © 2013 Benoît Pin MINES ParisTech
2
3 var DDImageUploader;
4
5 (function(){
6 // nombre maximun d'image chargées en local
7 var MAX_PREVIEW = 2;
8 var isThumbnail = /.*\/getThumbnail$/;
9
10 DDImageUploader = function(dropbox, uploadUrl, options) {
11 DDFileUploaderBase.apply(this, [dropbox, uploadUrl]);
12
13 this.existingSlides = this.indexExistingSlides();
14 this.slideSize = options.slideSize || 222; // pixels
15 this.progressBarMaxSize = this.slideSize - 22 || 200;
16 this.thumbnailSize = options.thumbnailSize || 180;
17 this.previewQueue = [];
18 this._previewQueueRunning = false;
19 this.previewsLoaded = 0;
20 };
21
22 copyPrototype(DDImageUploader, DDFileUploaderBase);
23
24 DDImageUploader.prototype.indexExistingSlides = function() {
25 var images = this.dropbox.getElementsByTagName('img');
26 var i;
27 var index = [];
28 for (i=0 ; i < images.length ; i++) {
29 if (isThumbnail.test(images[i].src)) {
30 index[images[i].src] = images[i]; }
31 }
32 return index;
33 };
34
35 // Methods about upload.
36 DDImageUploader.prototype.handleFiles = function(files) {
37 var file, i, slide;
38 for (i = 0; i < files.length; i++) {
39 file = files[i];
40 slide = this.createSlide(file);
41 this.previewQueuePush(slide);
42 this.uploadQueuePush(slide);
43 }
44 };
45
46 DDImageUploader.prototype.beforeUpload = function(slide) {
47 this.uploadedSlide = slide;
48 this.previewImg = slide.img;
49 this.progressBar = slide.progressBar;
50 };
51
52 DDImageUploader.prototype.uploadCompleteHandlerCB = function(req) {
53 var slide = this.uploadedSlide;
54 this.uploadedSlide.removeChild(slide.label);
55 this.uploadedSlide.removeChild(slide.progressBar);
56 var fragment = getCopyOfNode(req.responseXML.documentElement.firstChild);
57 var img = fragment.getElementsByTagName('img')[0];
58 if (req.status === 200) {
59 // update
60 var existing = this.existingSlides[img.src];
61 if (existing) {
62 existing.src = existing.src + '?' + Math.random().toString();
63 }
64 slide.img.src = '';
65 slide.img.parentNode.removeChild(slide.img);
66 slide.img = undefined;
67 slide.parentNode.removeChild(slide);
68 }
69 else if(req.status === 201) {
70 // creation
71 img.onload = function(evt) {
72 // accelerate GC before replacing
73 slide.img.src = '';
74 slide.img.parentNode.removeChild(slide.img);
75 slide.img = undefined;
76 slide.parentNode.replaceChild(fragment, slide);
77 };
78 }
79 this.previewsLoaded--;
80 this.previewQueueLoadNext();
81 };
82
83 DDImageUploader.prototype.progressHandlerCB = function(progress) {
84 this.updateProgressBar(progress);
85 var currentOpacity = this.previewImg.style.opacity;
86 this.previewImg.style.opacity = Math.max(currentOpacity, progress);
87 };
88
89 // Methods about preview queue.
90 DDImageUploader.prototype.previewQueuePush = function(slide) {
91 this.previewQueue.push(slide);
92 if (!this._previewQueueRunning) {
93 this.startPreviewQueue();
94 }
95 };
96
97 DDImageUploader.prototype.startPreviewQueue = function() {
98 this._previewQueueRunning = true;
99 this.previewQueueLoadNext();
100 };
101
102 DDImageUploader.prototype.previewQueueLoadNext = function() {
103 if (this.previewQueue.length && this.previewsLoaded < MAX_PREVIEW) {
104 var slide = this.previewQueue.shift();
105 this.previewUploadedImage(slide);
106 this.previewsLoaded++;
107 }
108 else {
109 this._previewQueueRunning = false;
110 }
111 };
112
113 // User interface
114 DDImageUploader.prototype.createSlide = function(file) {
115 var slide = document.createElement('span');
116 slide.file = file;
117
118 var a = document.createElement('a');
119 a.href = '#';
120 a.className = 'slide';
121
122 var img = document.createElement('img');
123 img.className = 'hidden';
124 var size = this.thumbnailSize;
125 var self = this;
126 img.onload = function(evt) {
127 if (img.width > img.height) { // landscape
128 img.height = Math.round(size * img.height / img.width);
129 img.width = size;
130 }
131 else {
132 img.width = Math.round(size * img.width / img.height);
133 img.height = size;
134 }
135 img.style.marginLeft = Math.floor((self.slideSize - img.width) / 2) + 'px';
136 img.style.marginTop = Math.floor((self.slideSize - img.height) / 2) + 'px';
137 img.style.opacity = 0.2;
138 img.className = undefined;
139 };
140 a.appendChild(img);
141 slide.img = img;
142
143 var label = document.createElement('span');
144 slide.label = label;
145 label.className = 'label';
146 label.innerHTML = file.name;
147
148 var progressBar = document.createElement('span');
149 progressBar.className = 'upload-progress';
150 slide.progressBar = progressBar;
151
152 slide.appendChild(a);
153 slide.appendChild(progressBar);
154 slide.appendChild(label);
155 this.dropbox.appendChild(slide);
156
157 return slide;
158 };
159
160 DDImageUploader.prototype.updateProgressBar = function(progress) {
161 // 0 <= progress <= 1
162 var size = this.progressBarMaxSize * progress;
163 size = Math.round(size);
164 this.progressBar.style.width = size + 'px';
165 };
166
167 DDImageUploader.prototype.previewUploadedImage = function(slide) {
168 var reader = new FileReader();
169 var size = this.thumbnailSize;
170 var self = this;
171
172 reader.onload = function(evt) {
173 slide.img.src = evt.target.result;
174 setTimeout(function(){self.previewQueueLoadNext();}, 500);
175 };
176 reader.readAsDataURL(slide.file);
177 };
178
179
180 }());