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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2017-07-21 21:19:35 +03:00
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content: attr(index);
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2017-07-16 23:18:19 +03:00
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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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2017-07-21 21:19:35 +03:00
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content: attr(index);
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2017-07-16 23:18:19 +03:00
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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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2017-07-21 21:19:35 +03:00
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// items - list of items, each item must be make(..) compatible
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// ...this can also be a function and return multiple
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// items (XXX)
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// make - item DOM constructor
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//
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// Options:
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// container - element that actually contains the items (default: 'this')
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// direction - scroll direction (default: 'vertical')
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// threshold -
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//
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// XXX horizontal scroll is still buggy -- mostly in thresholds...
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var makeScrollHandler = function(items, make, options){
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2017-07-17 01:43:14 +03:00
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options = options || {}
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2017-07-21 21:19:35 +03:00
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var direction = options.direction || 'vertical'
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2017-07-22 01:54:04 +03:00
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//var threshold = options.threshold ||
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2017-07-21 21:19:35 +03:00
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var _container = options.container || 'this'
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// XXX should we do an initial load here???
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2017-07-17 01:43:14 +03:00
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return function(evt){
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2017-07-21 21:19:35 +03:00
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var container = _container == 'this' ?
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this
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: typeof(_container) == typeof('str') ?
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this.querySelector(_container)
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: _container
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if(direction == 'vertical'){
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var size = this.scrollHeight
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var offset = this.scrollTop
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var visible_size = this.offsetHeight
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var elem_scroll_attr = 'scrollTop'
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var elem_offset_attr = 'offsetTop'
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var elem_size_attr = 'offsetHeight'
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} else {
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var size = this.scrollWidth
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var offset = this.scrollLeft
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var visible_size = this.offsetWidth
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var elem_scroll_attr = 'scrollLeft'
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var elem_offset_attr = 'offsetLeft'
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var elem_size_attr = 'offsetWidth'
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}
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2017-07-17 01:43:14 +03:00
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2017-07-22 01:54:04 +03:00
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// XXX
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var threshold = visible_size
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2017-07-21 21:19:35 +03:00
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var dom_items = container.children
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// head limit -- add items to the head...
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if(offset < threshold){
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var i = parseInt(dom_items[0].getAttribute('index')) - 1
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var e = items instanceof Function ?
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items(i)
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// XXX make this support multiple items...
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: items[i]
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// make the item(s)...
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if(e){
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2017-07-22 01:54:04 +03:00
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// XXX need to account for situations where the whole thing is replaced...
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var c = dom_items[0]
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var pre = c[elem_offset_attr]
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2017-07-21 21:19:35 +03:00
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container.prepend(make(e))
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// compensate offset for added items...
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2017-07-22 01:54:04 +03:00
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var d = c[elem_offset_attr] - pre
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// XXX need to do this only if the browser is not compensating...
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if(direction == 'horizontal'){
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this[elem_scroll_attr] += d
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}
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2017-07-21 21:19:35 +03:00
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// remove hidden items from tail...
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var t = offset + visible_size + threshold
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;[].slice.call(dom_items)
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// XXX add threshold / items-to-keep-offscreen limit ...
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2017-07-22 01:54:04 +03:00
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// XXX this is wrong for horizontal scroll...
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2017-07-21 21:19:35 +03:00
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.filter(function(e){ return e[elem_offset_attr] > t })
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// XXX can we remove these in one go???
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.forEach(function(e){ e.remove() })
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}
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}
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2017-07-17 01:43:14 +03:00
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2017-07-21 21:19:35 +03:00
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// tail limit -- add items to the tail...
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if( size - (offset + visible_size) < threshold ){
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var i = parseInt(dom_items[dom_items.length-1].getAttribute('index')) + 1
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var e = items instanceof Function ?
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items(i)
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// XXX make this support multiple items...
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: items[i]
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if(e){
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container.append(make(e))
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2017-07-22 01:54:04 +03:00
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//var clone = container.cloneNode(true)
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//container.replaceWith(clone)
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// XXX need to account for situations where the whole thing is replaced...
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var c = dom_items[dom_items.length-1]
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var pre = c[elem_offset_attr]
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2017-07-21 21:19:35 +03:00
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// remove hidden items for head...
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;[].slice.call(dom_items)
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// XXX add threshold / items-to-keep-offscreen limit ...
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.filter(function(e){ return e[elem_offset_attr] + e[elem_size_attr] < offset })
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// XXX can we remove these in one go???
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.forEach(function(e){ e.remove() })
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// compensate offset for removed items...
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2017-07-22 01:54:04 +03:00
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var d = c[elem_offset_attr] - pre
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// XXX need to do this only if the browser is not compensating...
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if(direction == 'horizontal'){
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this[elem_scroll_attr] += d
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}
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//container.replaceWith(container)
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2017-07-21 21:19:35 +03:00
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}
|
2017-07-17 01:43:14 +03:00
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}
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}
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}
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2017-07-16 23:18:19 +03:00
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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()
|
2017-07-21 21:19:35 +03:00
|
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|
i.setAttribute('index', n)
|
2017-07-16 23:18:19 +03:00
|
|
|
return i
|
|
|
|
|
}
|
|
|
|
|
var makeRibbon = function(n){
|
|
|
|
|
var r = ribbon.cloneNode()
|
|
|
|
|
for(var i=0; i < image_count; i++){
|
|
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|
|
r.appendChild(makeImage(i))
|
|
|
|
|
}
|
2017-07-21 21:19:35 +03:00
|
|
|
|
|
|
|
|
var rc = ribbon_container.cloneNode()
|
2017-07-16 23:18:19 +03:00
|
|
|
rc.appendChild(r)
|
2017-07-21 21:19:35 +03:00
|
|
|
rc.setAttribute('index', n)
|
|
|
|
|
|
|
|
|
|
$(rc).scroll(makeScrollHandler(
|
|
|
|
|
function(n){ return n >= 0 ? n : undefined },
|
|
|
|
|
makeImage,
|
|
|
|
|
{
|
|
|
|
|
container: r,
|
|
|
|
|
direction: 'horizontal',
|
2017-07-22 01:54:04 +03:00
|
|
|
threshold: 300,
|
2017-07-21 21:19:35 +03:00
|
|
|
}))
|
|
|
|
|
|
2017-07-16 23:18:19 +03:00
|
|
|
return rc
|
|
|
|
|
}
|
|
|
|
|
|
2017-07-21 21:19:35 +03:00
|
|
|
|
|
|
|
|
var fragment = document.createDocumentFragment()
|
2017-07-16 23:18:19 +03:00
|
|
|
for(var i=0; i < ribbon_count; i++){
|
2017-07-21 21:19:35 +03:00
|
|
|
fragment.appendChild(makeRibbon(i))
|
2017-07-16 23:18:19 +03:00
|
|
|
}
|
2017-07-21 21:19:35 +03:00
|
|
|
ribbon_set.appendChild(fragment)
|
2017-07-16 23:18:19 +03:00
|
|
|
|
|
|
|
|
|
|
|
|
|
// set margins to be parant and not content dependant...
|
|
|
|
|
$('.scaler')
|
|
|
|
|
.velocity({
|
|
|
|
|
'margin-left': -W/2,
|
|
|
|
|
'margin-top': -H/2,
|
|
|
|
|
}, 0)
|
2017-07-21 21:19:35 +03:00
|
|
|
.scroll(makeScrollHandler(
|
|
|
|
|
function(n){ return n >= 0 ? n : undefined },
|
|
|
|
|
makeRibbon,
|
2017-07-22 01:54:04 +03:00
|
|
|
{
|
|
|
|
|
container: ribbon_set,
|
|
|
|
|
threshold: 300,
|
|
|
|
|
}))
|
2017-07-16 23:18:19 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$(function(){
|
|
|
|
|
setup()
|
|
|
|
|
})
|
|
|
|
|
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
<body>
|
|
|
|
|
|
|
|
|
|
<div class="viewer mark-center">
|
|
|
|
|
<div class="scaler">
|
|
|
|
|
<div class="ribbon-set">
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
2017-07-21 21:19:35 +03:00
|
|
|
<!-- vim:set sw=4 ts=4 : -->
|
