zoomimage.js
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/**
*
* Zoomimage
* Author: Stefan Petre www.eyecon.ro
*
*/
(function($){
EYE.extend({
zoomimage: {
libs: {},
types: /\.jpg|\.jpeg|\.png|\.gif|\.bmp/g,
current: null,
moved: false,
pointer: {x:0,y:0},
diff: {x:0, y:0},
trackKey: false,
//default options (many options are controled via CSS)
defaults: {
opacity: 0.3, //caption opacity
border: 0, // border arround the image
shadow: 6, // shadow size
duration: 300, // animation duration
prevent: 14, // pixels to move the mouse before the image is dragged
controls: true, // display controls
caption: true, // display caption
hideSource: false,
centered: false,
className: false,
onLoad: function(){return false},
beforeZoomIn: function(){return false},
onZoomIn: function(){return false},
beforeZoomOut: function(){return false},
onZoomOut: function(){return false},
onFocus: function(){return false},
controlsTrigger: 'focus',
easing: 'linear',
preload: 'click'
},
// the template for the image's box
template: [
'<div class="zoomimage">',
'<div class="zoomimage_s">',
'<div class="zoomimage_st">',
'<div class="zoomimage_stl"></div>',
'<div class="zoomimage_stc"></div>',
'<div class="zoomimage_str"></div>',
'</div>',
'<div class="zoomimage_sc">',
'<div class="zoomimage_scl"></div>',
'<div class="zoomimage_scc"></div>',
'<div class="zoomimage_scr"></div>',
'</div>',
'<div class="zoomimage_sb">',
'<div class="zoomimage_sbl"></div>',
'<div class="zoomimage_sbc"></div>',
'<div class="zoomimage_sbr"></div>',
'</div>',
'</div>',
'<img src="" />',
'<div class="zoomimage_controls">',
'<a href="#" class="zoomimage_prev"></a>',
'<a href="#" class="zoomimage_next"></a>',
'</div>',
'<div class="zoomimage_caption"></div>',
'<div class="zoomimage_loading"></div>',
'</div>'
],
// handle click on the trigger
click: function(e) {
var el = this;
el.blur();
// if the image was not preloaded yet then wait
if (el.zoomimageCfg.loading === true) {
return false;
}
//zoom it in if not zoomed already
if (el.zoomimageCfg.zoomed == false) {
EYE.zoomimage.zoomIn(el);
//else zoom it out
} else {
EYE.zoomimage.zoomOut(el, false);
}
return false;
},
// zoom in the image
zoomIn: function(el) {
//if the image was not loaded yet then wait
if (el.zoomimageCfg.loaded === false) {
//if the image is not preloading then start preloading
if (el.zoomimageCfg.loading != true) {
el.zoomimageCfg.loading = true;
EYE.zoomimage.preload(el);
}
return;
}
//if the image is zoomed in then just focus it
if (el.zoomimageCfg.zoomed == true) {
EYE.zoomimage.focus(el);
return;
}
el.zoomimageCfg.beforeZoomIn.apply(el,[el.zoomimageCfg.box]);
var elPos = EYE.getPosition(el, true);
var elHeight = el.offsetHeight;
var elWidth = el.offsetWidth;
var pos = EYE.getScroll();
var borderAndShadow = el.zoomimageCfg.border + el.zoomimageCfg.shadow;
var width = el.zoomimageCfg.width + borderAndShadow * 2;
var height = el.zoomimageCfg.height + borderAndShadow * 2;
var screenRatio = pos.iw/pos.ih;
var imageRatio = el.zoomimageCfg.width/el.zoomimageCfg.height;
// if the image is bigger then the viewport then resize the image to fit
if (screenRatio > imageRatio) {
if (height > pos.ih) {
height = pos.ih;
width = parseInt(height * imageRatio,10);
}
} else if (width > pos.iw) {
width = pos.iw;
height = parseInt(width / imageRatio, 10);
}
//if the image should be centered then do that, else center to trigger's position but do not leave the viewport
var top = el.zoomimageCfg.centered ?
pos.t + parseInt((pos.ih - height)/2, 10)
:
Math.min(
Math.max(
pos.t,
elPos.y + (elHeight - height)/2 - borderAndShadow
),
pos.t + pos.ih - height
);
var left = el.zoomimageCfg.centered ?
pos.l + parseInt((pos.iw - width)/2, 10)
:
Math.min(
Math.max(
pos.l,
elPos.x + (elWidth - width)/2 - borderAndShadow
),
pos.l + pos.iw - width
);
var imgWidth = width - borderAndShadow * 2;
var imgHeight = height - borderAndShadow * 2;
if(el.zoomimageCfg.hideSource === true) {
el.style.visibility = 'hidden';
}
//move the image's box and animated it
$('#' + el.zoomimageCfg.box)
.css({
top: elPos.y + 'px',
left: elPos.x + 'px',
width: elWidth + 'px',
height: elHeight + 'px'
})
.find('>div')
.hide()
.end()
.find('img')
.attr('src', el.zoomimageCfg.src)
.css({
top: 0,
left: 0,
width: '100%',
height: '100%',
display: 'block',
borderWidth: '0px'
})
.end()
.animate({
width: imgWidth,
height: imgHeight,
top: top + borderAndShadow,
left: left + borderAndShadow
},
el.zoomimageCfg.duration,
el.zoomimageCfg.easing,
function(){
$(this)
.css({
top: top + 'px',
left: left + 'px',
width: width + 'px',
height: height + 'px'
})
.find('img')
.css({
top: el.zoomimageCfg.shadow + 'px',
left: el.zoomimageCfg.shadow + 'px',
width: imgWidth + 'px',
height: imgHeight + 'px',
borderWidth: el.zoomimageCfg.border + 'px'
})
.end()
.find('>div:first')
.find('div.zoomimage_sc')
.css('height', height - el.zoomimageCfg.shadow*2 + 'px')
.end()
.show();
el.zoomimageCfg.zoomed = true;
EYE.zoomimage.focus(el);
el.zoomimageCfg.onZoomIn.apply(el,[el.zoomimageCfg.box]);
});
},
//focus image and show gallery controls if it is part of a gallery
showControls: function(el) {
if(el == undefined)
return;
if (el.zoomimageCfg == undefined) {
el = $('#' + $(el).attr('zoomimage')).get(0);
}
var height,
imgWidth,
borderAndShadow = el.zoomimageCfg.border + el.zoomimageCfg.shadow;
$('#' + el.zoomimageCfg.box)
.find('img')
.each(function(){
imgWidth = parseInt($.curCSS(this, 'width'),10);
})
.end()
.get(0).zoomimageControls = true;
// if it has caption then display it
if(el.zoomimageCfg.caption) {
$('#' + el.zoomimageCfg.box)
.find('>div:eq(2)')
.stop()
.css({
bottom: borderAndShadow + 'px',
left: borderAndShadow + 'px',
width: imgWidth + 'px'
})
.show()
.each(function() {
this.style.height = 'auto';
height = this.offsetHeight;
this.style.height = '0';
})
.animate({height: height}, el.zoomimageCfg.duration);
}
//if it has controls then show them
if(el.zoomimageCfg.controls) {
// show controls only if it is part of a gallery
if (EYE.zoomimage.libs[el.zoomimageCfg.lib] > 1) {
$('#' + el.zoomimageCfg.box)
.find('>div:eq(1)')
.show()
.each(function(){
if (!el.zoomimageCfg.controlsHeight) {
el.zoomimageCfg.controlsHeight = this.offsetHeight;
}
this.style.height = '0';
})
.css({
top: borderAndShadow + 'px',
left: borderAndShadow + 'px',
width: imgWidth + 'px'
})
.animate({height: el.zoomimageCfg.controlsHeight}, el.zoomimageCfg.duration);
}
}
},
//zoom out the image and go to the next/previous if any
zoomOut: function(el, goToNext) {
var boxEl, elPos, borderAndShadow, elSize;
// if the action was started by the trigger
if (el.zoomimageCfg) {
if (el.zoomimageCfg.zoomed === false) {
return;
}
el.zoomimageCfg.beforeZoomOut.apply(el,[el.zoomimageCfg.box]);
boxEl = document.getElementById(el.zoomimageCfg.box);
// else try to find a link that has the same href as the image src
} else {
boxEl = el;
el = $('a[href=' + $('img',boxEl).attr('src') + ']').get(0);
}
// the trigger was found so scale to image to trigger's size
if (el) {
elPos = EYE.getPosition(el, true);
el.zoomimageCfg.zoomed = false;
borderAndShadow = el.zoomimageCfg.border + el.zoomimageCfg.shadow;
elSize = {
width: el.offsetWidth,
height: el.offsetHeight
};
// the trigger was not found so scale the image to its center
} else {
borderAndShadow = EYE.zoomimage.defaults.border + EYE.zoomimage.defaults.shadow;
elSize = {
width: 0,
height: 0
};
elPos = EYE.getPosition(boxEl, true);
elPos.y += parseInt(boxEl.offsetHeight/2, 10);
elPos.x += parseInt(boxEl.offsetWidth/2, 10);
}
$(boxEl)
.css({
top: boxEl.offsetTop + borderAndShadow + 'px',
left: boxEl.offsetLeft + borderAndShadow + 'px',
width: boxEl.offsetWidth - borderAndShadow*2 + 'px',
height: boxEl.offsetHeight - borderAndShadow*2 + 'px'
})
.find('>div')
.stop()
.hide()
.end()
.find('img')
.css({
top: 0,
left: 0,
width: '100%',
height: '100%',
borderWidth: '0px'
})
.end()
.animate(
{
top: elPos.y + 'px',
left: elPos.x + 'px',
width: elSize.width + 'px',
height: elSize.height + 'px'
},
// if the trigger was not found the use the default duration
el ? el.zoomimageCfg.duration : EYE.zoomimage.defaults.duration,
el.zoomimageCfg.easing,
function() {
//hide image and remove focus
EYE.zoomimage.blur();
$(this).hide();
// if the trigger was found then aply callback and try to focus the next one zoomed
if (el) {
if(el.zoomimageCfg.hideSource === true) {
el.style.visibility = 'visible';
}
el.zoomimageCfg.onZoomOut.apply(el,[el.zoomimageCfg.box]);
if (!goToNext) {
EYE.zoomimage.focus($('div.zoomimage:visible:last').not(':animated').get(0));
}
//the trigger was not found so remove the image since no trigger is present in the page
} else {
$(boxEl).stop().remove();
}
}
);
},
mouseOver: function(e) {
var triggerEl = document.getElementById($(this).attr('zoomimage'));
if (triggerEl.zoomimageCfg.zoomed === true && this.zoomimageControls == false) {
EYE.zoomimage.showControls(triggerEl);
}
return false;
},
mouseOut: function(e) {
if ( !EYE.isChildOf(this, e.relatedTarget, this) ) {
$(this)
.find('>div:not(:first)')
.stop()
.hide();
this.zoomimageControls = false;
}
return false;
},
// prepare for possible drag
mouseDown: function(e) {
// find the trigger
var triggerEl = document.getElementById($(this).attr('zoomimage'));
//if the trigger was found then prepare informations for drag
if (triggerEl) {
$.extend(EYE.zoomimage,{
current: this,
prevent: triggerEl.zoomimageCfg.prevent,
moved: false,
diff: {
x: e.pageX - this.offsetLeft,
y: e.pageY - this.offsetTop
},
pointer: {
x: e.pageX ,
y: e.pageY
}
});
$(document)
.bind('mousemove', EYE.zoomimage.mouseMove)
.bind('mouseup', EYE.zoomimage.mouseUp);
// if the trigger was not found then it is an orphan and zoom it out
} else {
$(this).zoomimageClear();
}
return false;
},
//do the drag if prevent distance was overtake
mouseMove: function(e) {
var diffX = Math.abs(EYE.zoomimage.pointer.x - e.pageX);
var diffY = Math.abs(EYE.zoomimage.pointer.y - e.pageY);
//the prevent distance was not reached yet so we check if it is reached already
if (EYE.zoomimage.moved === false) {
if ( diffX > EYE.zoomimage.prevent|| diffY > EYE.zoomimage.prevent) {
EYE.zoomimage.moved = true;
$(EYE.zoomimage.current).addClass('zoomimage_move');
if (!$(EYE.zoomimage.current).is('.zoomimage_focused')) {
EYE.zoomimage.focus(EYE.zoomimage.current);
}
}
// the prevent distance was overtake so the element can be moved
} else {
EYE.zoomimage.current.style.top = e.pageY - EYE.zoomimage.diff.y + 'px';
EYE.zoomimage.current.style.left = e.pageX - EYE.zoomimage.diff.x + 'px';
}
return false;
},
//the drag stops
mouseUp: function (e) {
$(EYE.zoomimage.current).removeClass('zoomimage_move');
EYE.zoomimage.current = null;
$(document)
.unbind('mousemove', EYE.zoomimage.mouseMove)
.unbind('mouseup', EYE.zoomimage.mouseUp);
return false;
},
// click on image
imageClick: function(e) {
$(document)
.unbind('mousemove', EYE.zoomimage.mouseMove)
.unbind('mouseup', EYE.zoomimage.mouseUp);
var el = document.getElementById($(this).attr('zoomimage'));
// if the trigger was found
if (el) {
//if the image was not moved but was focused
if (EYE.zoomimage.moved === false && $(this).is('.zoomimage_focused')) {
// if the event target is a link then it was a click on one of the controls and go to the next image
if ($(e.target).is('a')) {
EYE.zoomimage.zoomNext(el, e.target.className == 'zoomimage_next' ? 1 : -1);
var goToNext = true;
// else just zoom it out
} else {
EYE.zoomimage.zoomOut(el, goToNext||false);
}
// just focus the image
} else if(!$(this).is('.zoomimage_focused')) {
EYE.zoomimage.focus(this);
}
//the trigger was not found so the image is orphan and zoom it out
} else {
$(this).zoomimageClear();
}
return false;
},
//zoom out any opened image and clear orphan images
clear: function() {
var subject = this;
if (subject.size() == 0) {
subject = $('div.zoomimage');
}
return subject.each(function(){
var triggerEl = document.getElementById($(this).attr('zoomimage'));
if (triggerEl) {
EYE.zoomimage.zoomOut(triggerEl, false);
} else {
EYE.zoomimage.zoomOut(this, false);
}
});
},
// zoom the next image in gallery
zoomNext: function(el, dir) {
if(el.zoomimageCfg.zoomed === false) {
return;
}
EYE.zoomimage.zoomOut(el, true);
var nextImg = el.zoomimageCfg.iteration + dir;
var lib = $(el).attr('zoomimage');
var maxImg = EYE.zoomimage.libs[lib];
if (nextImg < 0) {
nextImg = maxImg - 1;
} else if (nextImg >= maxImg) {
nextImg = 0;
}
EYE.zoomimage.zoomIn($('a[zoomimage="' + lib + '"]').get(nextImg));
},
//hande any key pressed
keyPressed: function(e) {
var el = $('div.zoomimage_focused');
if (el.size() == 1) {
var pressedKey = e.charCode || e.keyCode || -1;
el = $('#' + $(el).attr('zoomimage')).get(0);
var lib = $(el).attr('zoomimage');
switch (pressedKey)
{
//end
case 35:
// go to the last image in the gallery
if (EYE.zoomimage.libs[lib] > 1 && EYE.zoomimage.libs[lib] - 1 != el.zoomimageCfg.iteration) {
EYE.zoomimage.zoomNext(el, EYE.zoomimage.libs[lib] - el.zoomimageCfg.iteration - 1);
return false;
}
break;
//home
case 36:
// go to the first image in the gallery
if (EYE.zoomimage.libs[lib] > 1 && el.zoomimageCfg.iteration != 0) {
EYE.zoomimage.zoomNext(el, - el.zoomimageCfg.iteration);
return false;
}
break;
//down;
case 40:
//left
case 37:
//backspace
case 8:
//page up
case 33:
//p
case 80:
case 112:
// go to the previous image in the gallery
if (EYE.zoomimage.libs[lib] > 1) {
EYE.zoomimage.zoomNext(el, -1);
return false;
}
break;
//up
case 38:
//right
case 39:
//page down
case 34:
//space
case 32:
//n
case 110:
case 78:
// go to the next image in the gallery
if (EYE.zoomimage.libs[lib] > 1) {
EYE.zoomimage.zoomNext(el, 1);
return false;
}
break;
//escape
case 27:
// well zoome out the curent image
EYE.zoomimage.zoomOut(el, false);
return false;
break;
}
}
},
// focus on image
focus: function(el) {
if(el == undefined)
return;
if (el.zoomimageCfg == undefined) {
el = $('#' + $(el).attr('zoomimage')).get(0);
} else {
var showControls = true;
}
// if another image is focused then remove focus
EYE.zoomimage.blur(el);
$('#' + el.zoomimageCfg.box)
.not('.zoomimage_focused')
.addClass('zoomimage_focused');
el.zoomimageCfg.onFocus.apply(el,[el.zoomimageCfg.box]);
if (el.zoomimageCfg.controlsTrigger == 'focus' || showControls) {
EYE.zoomimage.showControls(el);
}
},
//blur image
blur: function(el) {
$('div.zoomimage_focused')
.not('#' + (el == undefined ? 'fakezoomimage' : el.zoomimageCfg.box))
.removeClass('zoomimage_focused')
.each(function(){
this.zoomimageControls = false;
})
.find('>div:not(:first)')
.stop()
.hide();
},
preload: function(el) {
// place the loading aimation on top
var boxEl = $('#' + el.zoomimageCfg.box).show();
boxEl.find('>div, img').hide();
var elPos = EYE.getPosition(el, true);
boxEl
.find('>div:last')
.show()
.end()
.css({
top: elPos.y + 'px',
left: elPos.x + 'px',
width: el.offsetWidth + 'px',
height: el.offsetHeight + 'px'
});
// preload the image
var preld= new Image();
preld.src = el.href;
//if the image was laoded already
if (preld.complete) {
EYE.zoomimage.markPreloaded(preld, el);
// else place a callback
} else {
preld.onload = function() {
EYE.zoomimage.markPreloaded(preld, el);
};
}
},
markPreloaded: function(preld, el) {
//mark image as loaded and remember the size and source
$.extend(el.zoomimageCfg,{
loaded: true,
width: preld.width,
height: preld.height,
src: preld.src
});
// hide loading animation
$('#' + el.zoomimageCfg.box)
.find('div.zoomimage_loading')
.hide();
//if the image waits to be enlarged then zoom in
if (el.zoomimageCfg.loading) {
el.zoomimageCfg.loading = false;
EYE.zoomimage.zoomIn(el);
}
el.zoomimageCfg.onLoad.apply(el,[el.zoomimageCfg.box]);
},
//constructor
init: function(opt) {
//generate a library key
var libKey = parseInt(Math.random()*2000,10);
//store the number of images in the library
EYE.zoomimage.libs[libKey] = 0;
opt = $.extend({lib:libKey}, EYE.zoomimage.defaults, opt||{});
return this.each(function(){
var jQEl = $(this);
var el = this;
//consider only the links pointing to an image
if (el.href && el.href.toLowerCase().match(EYE.zoomimage.types) != null) {
//store library options
el.zoomimageCfg = $.extend({}, opt, {
zoomed: false,
loading: false,
loaded: false,
animated: false,
src: el.href,
iteration: EYE.zoomimage.libs[libKey],
box: 'zoomimage_' + parseInt(Math.random() * 2000, 10) + ''
});
//increment the number of images in the library
EYE.zoomimage.libs[libKey]++;
jQEl
.bind('click', EYE.zoomimage.click)
.attr('zoomimage', libKey)
.attr('zoomimageBox', el.zoomimageCfg.box);
var currId = jQEl.attr('id');
if (!currId) {
currId = el.zoomimageCfg.box + '_trigger';
jQEl.attr('id', currId);
}
var titleAttr = $(el).attr('title');
if (titleAttr == '' || titleAttr == false) {
el.zoomimageCfg.caption = false;
}
// generate the HTML for the image's box
$(EYE.zoomimage.template.join(''))
.attr('id', el.zoomimageCfg.box)
.attr('zoomimage', currId)
.addClass(el.zoomimageCfg.className)
.appendTo(document.body)
.bind('mousedown', EYE.zoomimage.mouseDown)
.bind('click', EYE.zoomimage.imageClick)
.each(function(){
this.zoomimageControls = false;
if (el.zoomimageCfg.controlsTrigger != 'focus') {
$(this)
.bind('mouseover', EYE.zoomimage.mouseOver)
.bind('mouseout', EYE.zoomimage.mouseOut);
}
})
.find('>div')
.not(':first')
.css('opacity', el.zoomimageCfg.opacity)
.end()
.filter('div:eq(2)')
.html('<p>' + titleAttr + '</p>');
if (el.zoomimageCfg.preload == 'load') {
EYE.zoomimage.preload(el);
}
if (EYE.zoomimage.trackKey === false) {
EYE.zoomimage.trackKey = true;
$(document).bind('keydown', EYE.zoomimage.keyPressed);
}
}
});
}
}
});
$.fn.extend({
/**
* Open all images found in 'href' attribute from each element specified in the selection. The images are grouped in galleries. The images are preloaded before any user interation.
* @name zoomimage
* @description Open all images found in 'href' attribute from each element specified in the selection. The images are grouped in galleries
* @param Hash options A hash of parameters. All parameters are optional.
* @option float opacity The opacity for the caption and controls. Default: 0.3
* @option int border Image's border. Default: 0
* @option int duration Animation duration. Default 300
* @option int prevent Pixes to move the mouse before the images is dragged (prevents accidental dragging). Default: 14
* @option boolean controls Whatever if the controls are displayed (if the image is not part of an libriry then the controls are not displayed)
* @option boolean caption Whatever if the caption is displayed (the caption text is the text from 'title' atribute. Default: true
* @option boolean centered Whatever if the image should be centered in the viewport or to the trigger. Default: false
* @option string easing Animation easing. Default: linear
* @option boolean hideSource Whatever to hide source when the image is opened. Default: false
* @option string className CSS class to add to image's box. Default: false
* @option string controlsTrigger 'focus' to show caption and controls when the box is focused or 'mouseover' to show controls and caption on mouse over. Default: 'focus'
* @option string preload 'click' to preload the image when the trigger is clicked or 'load' to preload the image on document load. Default: 'click'
* @option function onLoad Callback function triggered when the image was loaded
* @option function beforeZoomIn Callback function triggered before the image is zoomed in
* @option function onZoomIn Callback function triggered when the image is zooms in
* @option function beforeZoomOut Callback function triggered before the image is zoomed out
* @option function onZoomOut Callback function triggered when the image is zooms out
* @option function onFocus Callback function triggered when the image is focused
*/
zoomimage: EYE.zoomimage.init,
/**
* Zooms out all opened images and removes orphans (when the trigger was not found)
* To clear specific images use for slector 'div.zooimage[whatever]', else all the images are processed
*/
zoomimageClear: EYE.zoomimage.clear
});
})(jQuery);