Minimalistic Slideshow Gallery con jQuery

La variedad de galerías o slideshow de imágenes desarrolladas bajo jQuery, es casi abrumadora. Muchas de estas, aunque son muy sencillas de incluir en cualquier desarrollo web, exceden en funcionalidad las necesidades el proyecto. Minimalistic Slideshow Gallery es otra galería de imágenes desarrollada con jQuery pero que se destaca por ser muy simple, muy sencilla de implementar y minimalista sin sacrificar nada.

Minimalistic Slideshow Gallery es un simple slideshow que muestra una serie de imágenes, incorpora una barra con controles de desplazamiento que permiten ir hacia adelante o hacia atrás, además de una opción de mostrar un mosaico de las imágenes para seleccionar una directamente.

Implementar Minimalistic Slideshow Gallery

Esta galería es sin dudas una de las más simples de implementar. Si descargamos el demo y lo examinamos, pareciera que el código es extenso, esto es porque el Javascript está en la página y no en un archivo externo o contenido dentro de un plugin. Por eso es siguiente código, sería interesante enlazarlo desde un archivo externo:
<!-- The JavaScript -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
/**
* interval : time between the display of images
* playtime : the timeout for the setInterval function
* current : number to control the current image
* current_thumb : the index of the current thumbs wrapper
* nmb_thumb_wrappers : total numberof thumbs wrappers
* nmb_images_wrapper : the number of images inside of each wrapper
*/
var interval= 4000;
var playtime;
var current = 0;
var current_thumb = 0;
var nmb_thumb_wrappers= $('#msg_thumbs .msg_thumb_wrapper').length;
var nmb_images_wrapper = 6;
/**
* start the slideshow
*/
play();
/**
* show the controls when
* mouseover the main container
*/
slideshowMouseEvent();
function slideshowMouseEvent(){
$('#msg_slideshow').unbind('mouseenter')
.bind('mouseenter',showControls)
.andSelf()
.unbind('mouseleave')
.bind('mouseleave',hideControls);
}
/**
* clicking the grid icon,
* shows the thumbs view, pauses the slideshow, and hides the controls
*/
$('#msg_grid').bind('click',function(e){
hideControls();
$('#msg_slideshow').unbind('mouseenter').unbind('mouseleave');
pause();
$('#msg_thumbs').stop().animate({'top':'0px'},500);
e.preventDefault();
});
/**
* closing the thumbs view,
* shows the controls
*/
$('#msg_thumb_close').bind('click',function(e){
showControls();
slideshowMouseEvent();
$('#msg_thumbs').stop().animate({'top':'-230px'},500);
e.preventDefault();
});
/**
* pause or play icons
*/
$('#msg_pause_play').bind('click',function(e){
var $this = $(this);
if($this.hasClass('msg_play'))
play();
else
pause();
e.preventDefault();
});
/**
* click controls next or prev,
* pauses the slideshow,
* and displays the next or prevoius image
*/
$('#msg_next').bind('click',function(e){
pause();
next();
e.preventDefault();
});
$('#msg_prev').bind('click',function(e){
pause();
prev();
e.preventDefault();
});
/**
* show and hide controls functions
*/
function showControls(){
$('#msg_controls').stop().animate({'right':'15px'},500);
}
function hideControls(){
$('#msg_controls').stop().animate({'right':'-110px'},500);
}
/**
* start the slideshow
*/
function play(){
next();
$('#msg_pause_play').addClass('msg_pause').removeClass('msg_play');
playtime = setInterval(next,interval)
}
/**
* stops the slideshow
*/
function pause(){
$('#msg_pause_play').addClass('msg_play').removeClass('msg_pause');
clearTimeout(playtime);
}
/**
* show the next image
*/
function next(){
++current;
showImage('r');
}
/**
* shows the previous image
*/
function prev(){
--current;
showImage('l');
}
/**
* shows an image
* dir : right or left
*/
function showImage(dir){
/**
* the thumbs wrapper being shown, is always
* the one containing the current image
*/
alternateThumbs();
/**
* the thumb that will be displayed in full mode
*/
var $thumb = $('#msg_thumbs .msg_thumb_wrapper:nth-child('+current_thumb+')')
.find('a:nth-child('+ parseInt(current - nmb_images_wrapper*(current_thumb -1)) +')')
.find('img');
if($thumb.length){
var source = $thumb.attr('alt');
var $currentImage = $('#msg_wrapper').find('img');
if($currentImage.length){
$currentImage.fadeOut(function(){
$(this).remove();
$('<img />').load(function(){
var $image = $(this);
resize($image);
$image.hide();
$('#msg_wrapper').empty().append($image.fadeIn());
}).attr('src',source);
});
}
else{
$('<img />').load(function(){
var $image = $(this);
resize($image);
$image.hide();
$('#msg_wrapper').empty().append($image.fadeIn());
}).attr('src',source);
}
}
else{ //this is actually not necessary since we have a circular slideshow
if(dir == 'r')
--current;
else if(dir == 'l')
++current;
alternateThumbs();
return;
}
}
/**
* the thumbs wrapper being shown, is always
* the one containing the current image
*/
function alternateThumbs(){
$('#msg_thumbs').find('.msg_thumb_wrapper:nth-child('+current_thumb+')')
.hide();
current_thumb = Math.ceil(current/nmb_images_wrapper);
/**
* if we reach the end, start from the beggining
*/
if(current_thumb > nmb_thumb_wrappers){
current_thumb = 1;
current = 1;
}
/**
* if we are at the beggining, go to the end
*/
else if(current_thumb == 0){
current_thumb = nmb_thumb_wrappers;
current = current_thumb*nmb_images_wrapper;
}
$('#msg_thumbs').find('.msg_thumb_wrapper:nth-child('+current_thumb+')')
.show();
}
/**
* click next or previous on the thumbs wrapper
*/
$('#msg_thumb_next').bind('click',function(e){
next_thumb();
e.preventDefault();
});
$('#msg_thumb_prev').bind('click',function(e){
prev_thumb();
e.preventDefault();
});
function next_thumb(){
var $next_wrapper = $('#msg_thumbs').find('.msg_thumb_wrapper:nth-child('+parseInt(current_thumb+1)+')');
if($next_wrapper.length){
$('#msg_thumbs').find('.msg_thumb_wrapper:nth-child('+current_thumb+')')
.fadeOut(function(){
++current_thumb;
$next_wrapper.fadeIn();
});
}
}
function prev_thumb(){
var $prev_wrapper = $('#msg_thumbs').find('.msg_thumb_wrapper:nth-child('+parseInt(current_thumb-1)+')');
if($prev_wrapper.length){
$('#msg_thumbs').find('.msg_thumb_wrapper:nth-child('+current_thumb+')')
.fadeOut(function(){
--current_thumb;
$prev_wrapper.fadeIn();
});
}
}
/**
* clicking on a thumb, displays the image (alt attribute of the thumb)
*/
$('#msg_thumbs .msg_thumb_wrapper > a').bind('click',function(e){
var $this = $(this);
$('#msg_thumb_close').trigger('click');
var idx= $this.index();
var p_idx= $this.parent().index();
current= parseInt(p_idx*nmb_images_wrapper + idx + 1);
showImage();
e.preventDefault();
}).bind('mouseenter',function(){
var $this = $(this);
$this.stop().animate({'opacity':1});
}).bind('mouseleave',function(){
var $this = $(this);
$this.stop().animate({'opacity':0.5});
});
/**
* resize the image to fit in the container (400 x 400)
*/
function resize($image){
var theImage = new Image();
theImage.src = $image.attr("src");
var imgwidth = theImage.width;
var imgheight = theImage.height;
var containerwidth = 400;
var containerheight = 400;
if(imgwidth> containerwidth){
var newwidth = containerwidth;
var ratio = imgwidth / containerwidth;
var newheight = imgheight / ratio;
if(newheight > containerheight){
var newnewheight = containerheight;
var newratio = newheight/containerheight;
var newnewwidth =newwidth/newratio;
theImage.width = newnewwidth;
theImage.height= newnewheight;
}
else{
theImage.width = newwidth;
theImage.height= newheight;
}
}
else if(imgheight > containerheight){
var newheight = containerheight;
var ratio = imgheight / containerheight;
var newwidth = imgwidth / ratio;
if(newwidth > containerwidth){
var newnewwidth = containerwidth;
var newratio = newwidth/containerwidth;
var newnewheight =newheight/newratio;
theImage.height = newnewheight;
theImage.width= newnewwidth;
}
else{
theImage.width = newwidth;
theImage.height= newheight;
}
}
$image.css({
'width':theImage.width,
'height':theImage.height
});
}
});
</script>

Al examinar el código de arriba, vemos los parámetros que permite personalizar su funcionamiento y que son los mismo que se encuentran en cualquier recurso similar.

Minimalistic Slideshow Gallery

Sitio: tympanus.net/codrops/2010/07/05/minimalistic-slideshow-gallery/