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/**
* Scrolling Tweets
*
* @param {type} el The element to be converted to a scroller
*/
TwitterFeed.ScrollingTweets = function( el )
{
this.el = el;
this.slides = $(el).find('.atf-tweet-wrapper');
this.slide_count = this.slides.length;
this.slide_duration = parseInt($(el).attr('data-scroll-time')) * 1000;
// Hide slides
$(this.slides).each(function(i,e){
$(this).hide();
});
// Show the first slide
this.showSlide(0);
this.scrollText(0, 1000);
// Play the slide show from slide 1
this.play(1);
};
/**
* Show Slide
*
* Show the slide from the slides array with
* the given index 'slide_num' and hide the previous
* slide.
*
* @param {int} slide_num The number of the
* slide to show
*/
TwitterFeed.ScrollingTweets.prototype.showSlide = function(slide_num)
{
// Hide the previous slide and show the requested one
$(this.slides[this.current_slide]).hide();
$(this.slides[slide_num]).fadeIn(200);
// Update current slide number
this.current_slide = slide_num;
};
/**
* Scroll Text
*
* If the width of the textnode is greater than the
* width of its wrapper, this will scroll the text
* from right to left.
*
* @param {int} slide_num The number of the
* slide to show
* @param {int} scroll_delay The delay to
* start scrolling
* in milliseconds
*/
TwitterFeed.ScrollingTweets.prototype.scrollText = function(slide_num, scroll_delay)
{
// Variables
var child = $(this.slides[slide_num]).find('p');
var child_width = $(child).width();
var wrapper = $(this.slides[slide_num]).find('.atf-tweet-text');
var wrapper_width = $(wrapper).width();
var diff = child_width - wrapper_width;
// Zero the absolute position of the text
$(child).css('left',0);
// The text size exceeds the wrapper size
if(diff > 0) {
$(child).delay(scroll_delay).animate({
left: "-=" + diff,
},
// Use the difference to set the time, so that
// the scrolling time is the same regardless
// of the width of the text node
diff*10 );
}
};
/**
* Play
*
* Play the slideshow and scroll the text
* of each slide.
*
* @param {int} slide_num The number of the
* slide to start playing
* from.
*/
TwitterFeed.ScrollingTweets.prototype.play = function(slide_num)
{
var scroller = this;
var i = slide_num;
// Make sure the slide is within the array boundaries
if(i >= this.slide_count)
i = 0;
interval = setInterval(function(){
scroller.showSlide(i);
scroller.scrollText(i++, 1000);
if(i === scroller.slide_count)
i = 0;
}, this.slide_duration);
};
$('.atf-scrolling-tweets').each(function(){
new TwitterFeed.ScrollingTweets( this );
});