Template:FAFU CHINA/head2/js/jquery.cross-slide
/*
* Copyright 2007-2008 by Tobia Conforto <tobia.conforto@gmail.com> * * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General * Public License as published by the Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along with this program; if not, write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * Versions: 0.1 2007-08-19 Initial release * 2008-08-21 Re-released under GPL v2 * 0.1.1 2008-09-18 Compatibility with prototype.js * 0.2 2008-10-15 Linkable images, contributed by Tim Rainey <tim@zmlabs.com> * 0.3 2008-10-22 Added option to repeat the animation a number of times, then stop * 0.3.1 2008-11-11 Better error messages * 0.3.2 2008-11-11 Fixed a couple of CSS bugs, contributed by Erwin Bot <info@ixgcms.nl> */
jQuery.fn.crossSlide = function(opts, plan) { var self = this, self_width = this.width(), self_height = this.height();
// generic utilities function format(str) { for (var i = 1; i < arguments.length; i++) str = str.replace(new RegExp('\\{' + (i-1) + '}', 'g'), arguments[i]); return str; }
function abort() { arguments[0] = 'crossSlide: ' + arguments[0]; throw format.apply(null, arguments); }
// first preload all the images, while getting their actual width and height (function(proceed) {
var n_loaded = 0; function loop(i, img) { // for (i = 0; i < plan.length; i++) but with independent var i, img (for the closures) img.onload = function(e) { n_loaded++; plan[i].width = img.width; plan[i].height = img.height; if (n_loaded == plan.length) proceed(); } img.src = plan[i].src; if (i + 1 < plan.length) loop(i + 1, new Image()); } loop(0, new Image());
})(function() { // then proceed
// utility to parse "from" and "to" parameters function parse_position_param(param) { var zoom = 1; var tokens = param.replace(/^\s*|\s*$/g, ).split(/\s+/); if (tokens.length > 3) throw new Error(); if (tokens[0] == 'center') if (tokens.length == 1) tokens = ['center', 'center']; else if (tokens.length == 2 && tokens[1].match(/^[\d.]+x$/i)) tokens = ['center', 'center', tokens[1]]; if (tokens.length == 3) zoom = parseFloat(tokens[2].match(/^([\d.]+)x$/i)[1]); var pos = tokens[0] + ' ' + tokens[1]; if (pos == 'left top' || pos == 'top left') return { xrel: 0, yrel: 0, zoom: zoom }; if (pos == 'left center' || pos == 'center left') return { xrel: 0, yrel: .5, zoom: zoom }; if (pos == 'left bottom' || pos == 'bottom left') return { xrel: 0, yrel: 1, zoom: zoom }; if (pos == 'center top' || pos == 'top center') return { xrel: .5, yrel: 0, zoom: zoom }; if (pos == 'center center') return { xrel: .5, yrel: .5, zoom: zoom }; if (pos == 'center bottom' || pos == 'bottom center') return { xrel: .5, yrel: 1, zoom: zoom }; if (pos == 'right top' || pos == 'top right') return { xrel: 1, yrel: 0, zoom: zoom }; if (pos == 'right center' || pos == 'center right') return { xrel: 1, yrel: .5, zoom: zoom }; if (pos == 'right bottom' || pos == 'bottom right') return { xrel: 1, yrel: 1, zoom: zoom }; return { xrel: parseInt(tokens[0].match(/^(\d+)%$/)[1]) / 100, yrel: parseInt(tokens[1].match(/^(\d+)%$/)[1]) / 100, zoom: zoom }; }
// utility to compute the css for a given phase between p.from and p.to // phase = 1: begin fade-in, 2: end fade-in, 3: begin fade-out, 4: end fade-out function position_to_css(p, phase) { switch (phase) { case 1: var pos = 0; break; case 2: var pos = fade_ms / (p.time_ms + 2 * fade_ms); break; case 3: var pos = 1 - fade_ms / (p.time_ms + 2 * fade_ms); break; case 4: var pos = 1; break; } return { left: Math.round(p.from.left + pos * (p.to.left - p.from.left )), top: Math.round(p.from.top + pos * (p.to.top - p.from.top )), width: Math.round(p.from.width + pos * (p.to.width - p.from.width )), height: Math.round(p.from.height + pos * (p.to.height - p.from.height)) }; }
// check global params if (! opts.fade) abort('missing fade parameter.'); if (opts.speed && opts.sleep) abort('you cannot set both speed and sleep at the same time.'); // conversion from sec to ms; from px/sec to px/ms var fade_ms = Math.round(opts.fade * 1000); if (opts.sleep) var sleep = Math.round(opts.sleep * 1000); if (opts.speed) var speed = opts.speed / 1000, fade_px = Math.round(fade_ms * speed);
// set container css self.empty().css({ overflow: 'hidden', padding: 0 }); if (! self.css('position').match(/absolute|relative|fixed/)) self.css({ position: 'relative' }); if (! self.width() || ! self.height()) abort('container element does not have its own width and height');
// prepare each image for (var i = 0; i < plan.length; ++i) {
var p = plan[i]; if (! p.src) abort('missing src parameter in picture {0}.', i + 1);
if (speed) { // speed/dir mode
// check parameters and translate speed/dir mode into full mode (from/to/time) switch (p.dir) { case 'up': p.from = { xrel: .5, yrel: 0, zoom: 1 }; p.to = { xrel: .5, yrel: 1, zoom: 1 }; var slide_px = p.height - self_height - 2 * fade_px; break; case 'down': p.from = { xrel: .5, yrel: 1, zoom: 1 }; p.to = { xrel: .5, yrel: 0, zoom: 1 }; var slide_px = p.height - self_height - 2 * fade_px; break; case 'left': p.from = { xrel: 0, yrel: .5, zoom: 1 }; p.to = { xrel: 1, yrel: .5, zoom: 1 }; var slide_px = p.width - self_width - 2 * fade_px; break; case 'right': p.from = { xrel: 1, yrel: .5, zoom: 1 }; p.to = { xrel: 0, yrel: .5, zoom: 1 }; var slide_px = p.width - self_width - 2 * fade_px; break; default: abort('missing or malformed "dir" parameter in picture {0}.', i + 1); } if (slide_px <= 0) abort('picture number {0} is too short for the desired fade duration.', i + 1); p.time_ms = Math.round(slide_px / speed);
} else if (! sleep) { // full mode
// check and parse parameters if (! p.from || ! p.to || ! p.time) abort('missing either speed/sleep option, or from/to/time params in picture {0}.', i + 1); try { p.from = parse_position_param(p.from) } catch (e) { abort('malformed "from" parameter in picture {0}.', i + 1); } try { p.to = parse_position_param(p.to) } catch (e) { abort('malformed "to" parameter in picture {0}.', i + 1); } if (! p.time) abort('missing "time" parameter in picture {0}.', i + 1); p.time_ms = Math.round(p.time * 1000) }
// precalculate left/top/width/height bounding values if (p.from) jQuery.each([ p.from, p.to ], function(i, from_to) { from_to.width = Math.round(p.width * from_to.zoom); from_to.height = Math.round(p.height * from_to.zoom); from_to.left = Math.round((self_width - from_to.width) * from_to.xrel); from_to.top = Math.round((self_height - from_to.height) * from_to.yrel); });
// append the image element to the container var html = p.href ? format('<a href="{0}"><img src="{1}"/></a>', p.href, p.src) : format('<img src="{0}"/>', p.src); jQuery(html).appendTo(self).css({ position: 'absolute', visibility: 'hidden', top: 0, left: 0 }).find('img').css({ border: 0 }) } speed = undefined; // speed mode has now been translated to full mode
var imgs = self.children();
// show first image imgs.eq(0).css({ visibility: 'visible' }); if (! sleep) imgs.eq(0).css(position_to_css(plan[0], 2));
// create animation chain var countdown = opts.loop; function create_chain(i, chainf) { // building the chain backwards, or inside out
if (i % 2 == 0) { if (sleep) {
// still image sleep
var i_sleep = i / 2, i_hide = (i_sleep - 1 + plan.length) % plan.length, img_sleep = imgs.eq(i_sleep), img_hide = imgs.eq(i_hide);
var newf = function() { img_hide.css('visibility', 'hidden'); setTimeout(chainf, sleep); };
} else {
// single image slide
var i_slide = i / 2, i_hide = (i_slide - 1 + plan.length) % plan.length, img_slide = imgs.eq(i_slide), img_hide = imgs.eq(i_hide), time = plan[i_slide].time_ms, slide_anim = position_to_css(plan[i_slide], 3);
var newf = function() { img_hide.css('visibility', 'hidden'); img_slide.animate(slide_anim, time, 'linear', chainf); };
} } else { if (sleep) {
// still image cross-fade
var i_from = Math.floor(i / 2), i_to = Math.ceil(i / 2) % plan.length, img_from = imgs.eq(i_from), img_to = imgs.eq(i_to), from_anim = {}, to_init = { visibility: 'visible' }, to_anim = {};
if (i_to > i_from) { to_init.opacity = 0; to_anim.opacity = 1; } else { from_anim.opacity = 0; }
var newf = function() { img_to.css(to_init); if (from_anim.opacity != undefined) img_from.animate(from_anim, fade_ms, 'linear', chainf); else img_to.animate(to_anim, fade_ms, 'linear', chainf); };
} else {
// cross-slide + cross-fade
var i_from = Math.floor(i / 2), i_to = Math.ceil(i / 2) % plan.length, img_from = imgs.eq(i_from), img_to = imgs.eq(i_to), from_anim = position_to_css(plan[i_from], 4), to_init = position_to_css(plan[i_to], 1), to_anim = position_to_css(plan[i_to], 2);
if (i_to > i_from) { to_init.opacity = 0; to_anim.opacity = 1; } else { from_anim.opacity = 0; } to_init.visibility = 'visible';
var newf = function() { img_from.animate(from_anim, fade_ms, 'linear'); img_to.css(to_init); img_to.animate(to_anim, fade_ms, 'linear', chainf); };
} }
// if the loop option was requested, push a countdown check if (opts.loop && i == plan.length * 2 - 2) { var newf_orig = newf; newf = function() { if (--countdown) newf_orig(); } }
if (i > 0) return create_chain(i - 1, newf); else return newf; } var animation = create_chain(plan.length * 2 - 1, function() { return animation(); });
// start animation animation();
});
return self; };