2017-07-16 23:18:19 +03:00
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<!DOCTYPE html>
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<html>
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<!--
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//---------------------------------------------------------------------
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//
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-->
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<style>
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.mark-center:after {
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position: absolute;
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display: block;
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content: "";
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width: 5px;
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height: 5px;
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left: 50%;
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top: 50%;
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border-left: solid 2px red;
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border-top: solid 2px red;
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margin-left: -1px;
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margin-top: -1px;
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opacity: 0.8;
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z-index: 1;
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}
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.mark-center:before {
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position: absolute;
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display: block;
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content: "";
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width: 5px;
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height: 5px;
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right: 50%;
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bottom: 50%;
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border-bottom: solid 2px red;
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border-right: solid 2px red;
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margin-bottom: -1px;
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margin-right: -1px;
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opacity: 0.8;
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z-index: 1;
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}
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/* XXX appears that there is no way to hide the scrollbar on FF...
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* ...one way around this is to use something like iScroll/Scrolly
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* on FF or where more control is needed...
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*/
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.viewer {
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position: relative;
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display: inline-block;
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border: solid 1px gray;
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width: 600px;
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height: 500px;
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overflow: hidden;
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}
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.scaler {
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position: relative;
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width: 100%;
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height: 100%;
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top: 50%;
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left: 50%;
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margin-top: -50%;
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margin-left: -50%;
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transform-origin: 50% 50%;
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overflow-x: hidden;
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overflow-y: scroll;
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-ms-overflow-style: none;
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}
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.scaler::-webkit-scrollbar {
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display: none;
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}
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/* This is to be used for:
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* - vrtical positioning
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* - scaling
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* (update width to fit viewer)
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*/
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.ribbon-set {
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position: relative;
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display: inline-block;
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/* This allways needs to be of viewer width, this mostly applies
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* to scaling...
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*/
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width: 100%;
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padding-top: 50%;
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padding-bottom: 50%;
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}
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.ribbon-container {
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position: relative;
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2017-07-16 23:51:28 +03:00
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display: block;
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2017-07-16 23:18:19 +03:00
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height: 120px;
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width: 100%;
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overflow-x: scroll;
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overflow-y: hidden;
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-ms-overflow-style: none;
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}
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.ribbon-container::-webkit-scrollbar {
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display: none;
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}
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.ribbon-container:before {
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position: absolute;
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content: attr(n);
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}
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.ribbon {
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position: relative;
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display: inline-block;
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height: 100px;
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width: auto;
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white-space: nowrap;
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overflow: visible;
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background: silver;
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/*box-shadow: 0px 0px 25px -10px rgba(0,0,0,0.75);*/
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box-shadow: 0px 0px 25px -10px rgba(0,0,0,1);
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/* start/end markers... */
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/*border-left: 100px solid gray;
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border-right: 100px solid gray;*/
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margin: 10px;
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margin-left: 50%;
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/* XXX for some reason this does not work as expected */
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margin-right: 50%;
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}
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.image {
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position: relative;
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display: inline-block;
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width: 100px;
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height: 100px;
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outline: solid blue 1px;
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background: silver;
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}
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.image:after {
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content: attr(n);
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opacity: 0.5;
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}
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</style>
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<script src="../ext-lib/jquery.js"></script>
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<script src="../ext-lib/jquery-ui.js"></script>
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<script src="../ext-lib/velocity.min.js"></script>
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<script src="../lib/jli.js"></script>
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<script>
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var scale = function(){
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var s = /scale\(([^\)]+)\)/.exec($('.scaler')[0].style.transform)
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return s ? parseFloat(s.pop()) : 1
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}
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// XXX when setting origin at scales different from 1, we'll need to
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// adjust offset to compensate for the shift...
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// XXX one other simplification might be adding a new element specifically
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// dedicated to scaling...
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var centerOrigin = function(){
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var H = $('.viewer').height()
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var s = $('.viewer')[0].scrollTop
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$('.ribbon-set').css({
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'transform-origin': '50% '+ (s + H/2) +'px'
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})
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}
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// XXX these accumolate errors...
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var zoomIn = function(c){
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c = c || 1.2
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centerOrigin()
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$('.scaler')
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.velocity('stop')
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.velocity({
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scale: '*='+c,
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width: '/='+c,
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height: '/='+c,
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'margin-left': '/='+c,
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'margin-top': '/='+c,
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}, {
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duration: 300,
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easing: 'linear',
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})
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}
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var zoomOut = function(c){
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c = c || 1.2
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centerOrigin()
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$('.scaler')
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.velocity('stop')
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.velocity({
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scale: '/='+c,
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width: '*='+c,
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height: '*='+c,
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'margin-left': '*='+c,
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'margin-top': '*='+c,
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}, {
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duration: 300,
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easing: 'linear',
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})
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}
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var setup = function(){
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var H = $('.viewer').height()
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var W = $('.viewer').width()
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var ribbon_set = $('.ribbon-set')[0]
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// XXX need to calculate this considering scale...
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var threshold = 300
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var ribbon_count = 10
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var image_count = 10
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var ribbon_container = document.createElement('div')
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ribbon_container.classList.add('ribbon-container')
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var ribbon = document.createElement('div')
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ribbon.classList.add('ribbon')
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var image = document.createElement('div')
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image.classList.add('image')
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var makeImage = function(n){
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var i = image.cloneNode()
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i.setAttribute('n', n)
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return i
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}
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var makeRibbon = function(n){
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var rc = ribbon_container.cloneNode()
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var r = ribbon.cloneNode()
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for(var i=0; i < image_count; i++){
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r.appendChild(makeImage(i))
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}
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rc.appendChild(r)
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rc.setAttribute('n', n)
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return rc
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}
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for(var i=0; i < ribbon_count; i++){
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ribbon_set.appendChild(makeRibbon(i))
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}
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// set margins to be parant and not content dependant...
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$('.scaler')
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.velocity({
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'margin-left': -W/2,
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'margin-top': -H/2,
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}, 0)
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2017-07-16 23:51:28 +03:00
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// XXX make this generic...
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2017-07-16 23:18:19 +03:00
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.scroll(function(){
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var sh = this.scrollHeight
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var st = this.scrollTop
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// XXX for some reason removing/adding items from/to
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// the top does not require compensating here...
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2017-07-16 23:51:28 +03:00
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// ...it appears that if scrollTop is more than
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// the removed height then element positions do
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// not change...
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// - chrome only???
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// ...does not seam to work on other browsers
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// - vertical scroll only???
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// ...can't repeat for horizontal scroll
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2017-07-16 23:18:19 +03:00
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// top limit...
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if( st < threshold ){
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var c = ribbon_set.children
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var n = c[0].getAttribute('n')
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// add ribbon...
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if(n > 0){
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2017-07-16 23:51:28 +03:00
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// XXX compesate...
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2017-07-16 23:18:19 +03:00
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ribbon_set.prepend(makeRibbon(--n))
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// remove ribbon from bottom...
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if(c.length > ribbon_count){
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c[c.length - 1].remove()
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}
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}
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// bottom limit...
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} else if( sh - (st + H) < threshold ){
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var c = ribbon_set.children
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var n = c[c.length-1].getAttribute('n')
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// add ribbon...
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ribbon_set.appendChild(makeRibbon(++n))
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// remove ribon from top...
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if(c.length > ribbon_count){
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2017-07-16 23:51:28 +03:00
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// XXX compesate...
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2017-07-16 23:18:19 +03:00
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c[0].remove()
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}
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}
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})
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}
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$(function(){
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setup()
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})
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</script>
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<body>
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<div class="viewer mark-center">
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<div class="scaler">
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<div class="ribbon-set">
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</div>
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</div>
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</div>
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</body>
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</html>
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