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+/**
+*
+* Google Image Layout v0.0.1
+* Description, by Anh Trinh.
+* Heavily modified for searx
+* http://trinhtrunganh.com
+*
+* @license Free to use under the MIT License.
+*
+*/
+(function(w, d) {
+ 'use strict';
+
+ function ImageLayout(container_selector, results_selector, img_selector, maxHeight) {
+ this.container_selector = container_selector;
+ this.results_selector = results_selector;
+ this.img_selector = img_selector;
+ this.margin = 10;
+ this.maxHeight = maxHeight;
+ this._alignAllDone = true;
+ }
+
+ /**
+ * Get the height that make all images fit the container
+ *
+ * width = w1 + w2 + w3 + ... = r1*h + r2*h + r3*h + ...
+ *
+ * @param {[type]} images the images to be calculated
+ * @param {[type]} width the container witdth
+ * @param {[type]} margin the margin between each image
+ *
+ * @return {[type]} the height
+ */
+ ImageLayout.prototype._getHeigth = function(images, width) {
+ var r = 0,
+ img;
+
+ width -= images.length * this.margin;
+ for (var i = 0; i < images.length; i++) {
+ img = images[i];
+ if ((img.naturalWidth > 0) && (img.naturalHeight > 0)) {
+ r += img.naturalWidth / img.naturalHeight;
+ } else {
+ // assume that not loaded images are square
+ r += 1;
+ }
+ }
+
+ return width / r; //have to round down because Firefox will automatically roundup value with number of decimals > 3
+ };
+
+ ImageLayout.prototype._setSize = function(images, height) {
+ var img, imgWidth, imagesLength = images.length;
+ for (var i = 0; i < imagesLength; i++) {
+ img = images[i];
+ if ((img.naturalWidth > 0) && (img.naturalHeight > 0)) {
+ imgWidth = height * img.naturalWidth / img.naturalHeight;
+ } else {
+ // not loaded image : make it square as _getHeigth said it
+ imgWidth = height;
+ }
+ img.style.width = imgWidth + 'px';
+ img.style.height = height + 'px';
+ img.style.marginLeft = '3px';
+ img.style.marginTop = '3px';
+ img.style.marginRight = this.margin - 7 + 'px'; // -4 is the negative margin of the inline element
+ img.style.marginBottom = this.margin - 7 + 'px';
+ }
+ };
+
+ ImageLayout.prototype._alignImgs = function(imgGroup) {
+ var slice, h,
+ containerWidth = d.querySelector(this.container_selector).clientWidth;
+
+ w: while (imgGroup.length > 0) {
+ for (var i = 1; i <= imgGroup.length; i++) {
+ slice = imgGroup.slice(0, i);
+ h = this._getHeigth(slice, containerWidth);
+ if (h < this.maxHeight) {
+ this._setSize(slice, h);
+ imgGroup = imgGroup.slice(i);
+ continue w;
+ }
+ }
+ this._setSize(slice, Math.min(this.maxHeight, h));
+ break;
+ }
+ };
+
+ ImageLayout.prototype.align = function(results_selector) {
+ var results_selectorNode = d.querySelectorAll(this.results_selector),
+ results_length = results_selectorNode.length,
+ previous = null,
+ current = null,
+ imgGroup = [];
+ for (var i = 0; i < results_length; i++) {
+ current = results_selectorNode[i];
+ if (current.previousElementSibling !== previous && imgGroup.length > 0) {
+ // the current image is not conected to previous one
+ // so the current image is the start of a new group of images.
+ // so call _alignImgs to align the current group
+ this._alignImgs(imgGroup);
+ // and start a new empty group of images
+ imgGroup = [];
+ }
+ // add the current image to the group (only the img tag)
+ imgGroup.push(current.querySelector(this.img_selector));
+ // update the previous variable
+ previous = current;
+ }
+ // align the remaining images
+ if (imgGroup.length > 0) {
+ this._alignImgs(imgGroup);
+ }
+ };
+
+ ImageLayout.prototype.watch = function() {
+ var i, img, imgGroup, imgNodeLength,
+ obj = this,
+ results_nodes = d.querySelectorAll(this.results_selector),
+ results_length = results_nodes.length;
+
+ function align(e) {
+ obj.align();
+ }
+
+ function throttleAlign(e) {
+ if (obj._alignAllDone) {
+ obj._alignAllDone = false;
+ setTimeout(function() {
+ obj.align();
+ obj._alignAllDone = true;
+ }, 100);
+ }
+ }
+
+ w.addEventListener('resize', throttleAlign);
+ w.addEventListener('pageshow', align);
+
+ for (i = 0; i < results_length; i++) {
+ img = results_nodes[i].querySelector(this.img_selector);
+ if (typeof img !== 'undefined') {
+ img.addEventListener('load', throttleAlign);
+ img.addEventListener('error', throttleAlign);
+ }
+ }
+ };
+
+ w.searx.ImageLayout = ImageLayout;
+
+})(window, document);