Optimisation du chargement des vignettes juxtaposées à celle affichée.

[Portfolio.git] / skins / photo_film_viewer.js

diff --git a/skins/photo_film_viewer.js b/skins/photo_film_viewer.js
index 566984a..3140763 100644 (file)
--- a/skins/photo_film_viewer.js
+++ b/skins/photo_film_viewer.js
@@ -5,6 +5,7 @@ Licence Creative Commons http://creativecommons.org/licenses/by-nc/2.0/
 */
 
 var FilmSlider;
+var s;
 
 (function(){
 
@@ -16,6 +17,7 @@ var DEFAULT_IMAGE_SIZES = [500, 600, 800];
 
 FilmSlider = function(filmBar, slider, ctxInfos, image, toolbar, breadcrumbs) {
        var thisSlider = this;
+       s = this;
        this.filmBar = filmBar;
        this.filmBarWidth = getObjectWidth(this.filmBar);
        var film = filmBar.firstChild;
@@ -114,7 +116,14 @@ if (!browser.isMobile) {
 
 else {
        // pas de barre de scroll horizontal pour les tablettes
-       FilmSlider.prototype.resizeSlider = function(evt) {};
+       FilmSlider.prototype.resizeSlider = function(evt) {
+               this.filmMaxX = - (getObjectWidth(this.film) - this.filmBarWidth);
+               if (!this.initialized) {
+                       this.centerSlide(this.center);
+                       this.selectedSlide = this.filmBar.getElementsByTagName('img')[this.center].parentNode;
+                       this.initialized = true;
+               }
+       };
 }
 
 FilmSlider.prototype._checkSizeAfterLoad = function(evt) {
@@ -201,15 +210,25 @@ FilmSlider.prototype.getBestFitSize = function(ratio) {
        return DEFAULT_IMAGE_SIZES[i];
 };
 
-FilmSlider.prototype.centerSlide = function(slideIndex) {
-       if (this.sliderRatio > 1) { return; }
-       var filmBarWidth = getObjectWidth(this.filmBar);
-       var x = slideIndex * this.slideSize;
-       x = x - (filmBarWidth - this.slideSize) / 2.0;
-       x = x * this.sliderSpeedRatio;
-       var p = new Point( -x, 0 );
-       this.setSliderPosition(p);
-};
+if (!browser.isMobile) {
+       FilmSlider.prototype.centerSlide = function(slideIndex) {
+               if (this.sliderRatio > 1) { return; }
+               var filmBarWidth = getObjectWidth(this.filmBar);
+               var x = slideIndex * this.slideSize;
+               x = x - (filmBarWidth - this.slideSize) / 2.0;
+               x = x * this.sliderSpeedRatio;
+               var p = new Point( -x, 0 );
+               this.setSliderPosition(p);
+       };
+}
+else {
+       FilmSlider.prototype.centerSlide = function(slideIndex) {
+               var filmBarWidth = getObjectWidth(this.filmBar);
+               var x = slideIndex * this.slideSize;
+               x = x - (filmBarWidth - this.slideSize) / 2.0;
+               this.setFilmPosition(-x);
+       };
+}
 
 FilmSlider.prototype.setSliderPosition = function(point) {
        if(point.x < 0) { point.x = 0; }
@@ -218,9 +237,18 @@ FilmSlider.prototype.setSliderPosition = function(point) {
        this.setFilmPosition(point);
 };
 
-FilmSlider.prototype.setFilmPosition = function(point) {
-       this.film.style.left = point.x / this.sliderSpeedRatio + 'px';
-};
+if (!browser.isMobile) {
+       FilmSlider.prototype.setFilmPosition = function(point) {
+               this.film.style.left = point.x / this.sliderSpeedRatio + 'px';
+       };
+}
+else {
+       FilmSlider.prototype.setFilmPosition = function(x) {
+               x = Math.min(0, x);
+               x = Math.max(this.filmMaxX, x);
+               this.film.style.left = String(x) + 'px';
+       };
+}
 
 FilmSlider.prototype.getSliderPosition = function() {
        var x = parseInt(this.slider.style.left, 10);
@@ -263,6 +291,7 @@ FilmSlider.prototype.addEventListeners = function() {
        addListener(this.toolbar, 'click', function(evt){thisSlider.toolbarClickHandler(evt);});
        addListener(window, 'load', function(evt){thisSlider.fitToScreen(evt);});
        addListener(window, 'load', function(evt){thisSlider._checkSizeAfterLoad(evt);});
+       addListener(window, 'load', function(evt){thisSlider.startThumbnailsLoadQueue(evt);});
        
        // dd listeners
        addListener(this.slider, 'mousedown', this.ddHandlers.down);
@@ -587,16 +616,46 @@ else if (browser.isIE6up) {
 
 FilmSlider.prototype.touchStartHandler = function(evt) {
        this.filmStartX = parseInt(this.film.style.left, 10);
-       this.touchStartX = evt.pageX;
+       this.touchStartX = evt.changedTouches[0].screenX;
+       this.touchStartTime = (new Date()).getTime();
 };
 
 FilmSlider.prototype.touchMoveHandler = function(evt) {
-       var delta = this.touchStartX - evt.pageX;
-       var posX = Math.min(0, this.filmStartX - delta);
-       this.film.style.left = String(posX) + 'px';
+       disableDefault(evt);
+       var delta = this.touchStartX - evt.changedTouches[0].screenX;
+       var posX = this.filmStartX - delta;
+       this.setFilmPosition(posX);
+    this.lastMoveTime = (new Date()).getTime();
 };
 
 FilmSlider.prototype.touchEndHandler = function(evt) {
+    var x = evt.changedTouches[0].screenX;
+       var delta = x - this.touchStartX;
+       if (delta) {
+               disableDefault(evt);
+        var now = (new Date()).getTime();
+        if (now - this.lastMoveTime < 100) {
+            // au delà de 100 ms de maintient, on annule l'inertie
+               var speed = delta / (now - this.touchStartTime)
+               var x0 = parseInt(this.film.style.left, 10);
+               var t0 = (new Date()).getTime();
+               var d = 500; // milisecondes
+            var delta = 0;
+            var dt = 25
+               var self = this;
+       
+               function animate() {
+                // inertie
+                       var t = (new Date()).getTime() - t0;
+                       if (t < d) {
+                               setTimeout(animate, dt);
+                               delta = delta + (1-t/d) * speed * dt; // décelleration linéaire
+                               self.setFilmPosition(x0 + delta);
+                       }
+               }
+               animate();
+        }
+       }
        this.touchStartX = undefined;
 };
 
@@ -666,11 +725,47 @@ FilmSlider.prototype.refreshImage = function() {
 
 FilmSlider.prototype.updateBreadcrumbs = function(url, title) {
        if (this.hasBreadcrumbs) {
-               this.lastBCElement.href = element.getAttribute('lastBcUrl');
-               this.lastBCElement.innerHTML = element.getAttribute('img_id');
+               this.lastBCElement.href = url;
+               this.lastBCElement.innerHTML = title;
+       }
+};
+
+FilmSlider.prototype.startThumbnailsLoadQueue = function(evt) {
+       var thumbnails = this.film.getElementsByTagName('img');
+       this.thumbnailsLoadingOrder = [];
+       var leftSize = this.center;
+       var rightSize = thumbnails.length - this.center - 1;
+       var i;
+       for (i=1 ; i<=Math.min(leftSize, rightSize) ; i++) {
+               this.thumbnailsLoadingOrder.push(thumbnails[this.center + i]);
+               this.thumbnailsLoadingOrder.push(thumbnails[this.center - i]);
        }
+       if (leftSize > rightSize) {
+               for (i = this.center - rightSize - 1 ; i >= 0 ; i--) {
+                       console.log(i);
+                       this.thumbnailsLoadingOrder.push(thumbnails[i]);
+               }
+       }
+       else if (leftSize < rightSize) {
+               for (i = this.center + leftSize ; i < thumbnails.length ; i++) {
+                       this.thumbnailsLoadingOrder.push(thumbnails[i]);
+               }
+       }
+       var next = this.thumbnailsLoadingOrder.shift();
+       var self = this;
+       addListener(next, 'load', function(evt){self._loadNextThumb(evt);});
+       next.src = next.parentNode.href + '/getThumbnail';
 };
 
+FilmSlider.prototype._loadNextThumb = function(evt) {
+       var next = this.thumbnailsLoadingOrder.shift();
+       if (!next) {return;}
+       var self = this;
+       addListener(next, 'load', function(evt){self._loadNextThumb(evt);});
+       next.src = next.parentNode.href + '/getThumbnail';
+};
+
+
 FilmSlider.prototype.startSlideShow = function() {
        this.slideShowSlide = this.pendingSlideShowSlide = this.selectedSlide;
        return this.slideShowSlide.href;