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Code Issues Projects Releases Packages Wiki Activity Actions 2

theme: improve keyboard navigation for scrolling #268

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Sören Weber 2022-06-06 23:58:00 +02:00
parent ccce323f76
commit ae3ad846cc
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3 changed files with 68 additions and 15 deletions
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2
layouts/404.html
View file

@ -26,7 +26,7 @@
<body class="mobile-support" data-url="/">
<div id="body" class="default-animation" style="margin-left:0px;">
<div id="sidebar-overlay"></div>
<main id="body-inner" class="chapter">
<main id="body-inner" class="chapter" tabindex="-1">
<div class="flex-block-wrapper">
<h1>{{ T "title-404" }}</h1>
<p></p>

2
layouts/partials/header.html
View file

@ -104,7 +104,7 @@
{{- end }}
</div>
</nav>
<main id="body-inner" class="highlightable{{if .Params.chapter}} chapter{{end}}">
<main id="body-inner" class="highlightable{{if .Params.chapter}} chapter{{end}}" tabindex="-1">
<div class="flex-block-wrapper">
<div id="head-tags">
{{- partial "tags.html" . }}

79
static/js/theme.js
View file

@ -13,6 +13,11 @@ var touchsupport = ('ontouchstart' in window) || (navigator.maxTouchPoints > 0)
var formelements = 'button, datalist, fieldset, input, label, legend, meter, optgroup, option, output, progress, select, textarea';
// PerfectScrollbar
var psc;
var psm;
var pst;
function switchTab(tabGroup, tabId) {
allTabItems = jQuery("[data-tab-group='"+tabGroup+"']");
targetTabItems = jQuery("[data-tab-group='"+tabGroup+"'][data-tab-item='"+tabId+"']");
@ -301,7 +306,6 @@ function initMenuScrollbar(){
return;
}
var content = '#body-inner';
var autofocus = false;
document.addEventListener('keydown', function(event){
// for initial keyboard scrolling support, no element
@ -311,30 +315,37 @@ function initMenuScrollbar(){
// it and give focus to the scrollbar - only
// to just remove the focus right after scrolling
// happend
var p = document.querySelector(content).matches(':hover');
var c = document.querySelector('#body-inner').matches(':hover');
var m = document.querySelector('#content-wrapper').matches(':hover');
var t = document.querySelector('#TableOfContents').matches(':hover');
var f = event.target.matches( formelements );
if( !p && !m && !f ){
if( !c && !m && !t && !f ){
// only do this hack if none of our scrollbars
// is hovered
autofocus = true;
// if we are showing the sidebar as a flyout we
// want to scroll the content-wrapper, otherwise we want
// to scroll the body
var n = document.querySelector('body').matches('.sidebar-flyout');
if( n ){
var nt = document.querySelector('body').matches('.toc-flyout');
var nm = document.querySelector('body').matches('.sidebar-flyout');
if( nt ){
pst && pst.scrollbarY.focus();
}
else if( nm ){
psm && psm.scrollbarY.focus();
}
else{
document.querySelector('#body-inner').focus();
psc && psc.scrollbarY.focus();
}
}
});
// scrollbars will install their own keyboard handlers
// that need to be executed inbetween our own handlers
var psm = new PerfectScrollbar('#content-wrapper');
// PSC removed for #242 #243 #244
var psc; // = new PerfectScrollbar(content);
// psc = new PerfectScrollbar('#body-inner');
psm = new PerfectScrollbar('#content-wrapper');
pst = new PerfectScrollbar('#TableOfContents');
document.addEventListener('keydown', function(){
// if we facked initial scrolling, we want to
// remove the focus to not leave visual markers on
@ -342,12 +353,14 @@ function initMenuScrollbar(){
if( autofocus ){
psc && psc.scrollbarY.blur();
psm && psm.scrollbarY.blur();
pst && pst.scrollbarY.blur();
autofocus = false;
}
});
// on resize, we have to redraw the scrollbars to let new height
// affect their size
window.addEventListener('resize', function(){
pst && pst.update();
psm && psm.update();
psc && psc.update();
});
@ -415,19 +428,53 @@ function initImageStyles(){
});
}
function sidebarEscapeHandler( event ){
if( event.key == "Escape" ){
var b = document.querySelector( 'body' );
b.classList.remove( 'sidebar-flyout' );
document.removeEventListener( 'keydown', sidebarEscapeHandler );
document.querySelector( '#body-inner' ).focus();
psc && psc.scrollbarY.focus();
}
}
function tocEscapeHandler( event ){
if( event.key == "Escape" ){
var b = document.querySelector( 'body' );
b.classList.remove( 'toc-flyout' );
document.removeEventListener( 'keydown', tocEscapeHandler );
document.querySelector( '#body-inner' ).focus();
psc && psc.scrollbarY.focus();
}
}
function initToc(){
function showNav(){
var b = document.querySelector( 'body' );
b.classList.toggle( 'sidebar-flyout' );
var n = b.matches('.sidebar-flyout');
if( n ){
if( b.classList.contains( 'sidebar-flyout' ) ){
b.classList.remove( 'toc-flyout' );
document.removeEventListener( 'keydown', tocEscapeHandler );
document.addEventListener( 'keydown', sidebarEscapeHandler );
}
else{
document.removeEventListener( 'keydown', sidebarEscapeHandler );
document.querySelector( '#body-inner' ).focus();
psc && psc.scrollbarY.focus();
}
}
function showToc(){
var b = document.querySelector( 'body' );
b.classList.toggle( 'toc-flyout' );
pst && pst.update();
if( b.classList.contains( 'toc-flyout' ) ){
pst && pst.update();
document.addEventListener( 'keydown', tocEscapeHandler );
}
else{
document.removeEventListener( 'keydown', tocEscapeHandler );
document.querySelector( '#body-inner' ).focus();
psc && psc.scrollbarY.focus();
}
}
document.querySelector( '#sidebar-overlay' ).addEventListener( 'click', showNav );
@ -435,12 +482,10 @@ function initToc(){
document.querySelector( '#toc-overlay' ).addEventListener( 'click', showToc );
var t = document.querySelector( '#toc-menu' );
var p = document.querySelector( '.progress' );
var pst;
if( t && p ){
// we may not have a toc
t.addEventListener( 'click', showToc );
p.addEventListener( 'click', showToc );
pst = new PerfectScrollbar('#TableOfContents');
}
}
@ -468,7 +513,11 @@ function initSwipeHandler(){
else if( diffx > 30 ){
startx = null;
starty = null;
document.querySelector( 'body' ).classList.toggle( 'sidebar-flyout' );
var b = document.querySelector( 'body' );
b.classList.remove( 'sidebar-flyout' );
document.removeEventListener( 'keydown', sidebarEscapeHandler );
document.querySelector( '#body-inner' ).focus();
psc && psc.scrollbarY.focus();
}
}
return false;
@ -654,6 +703,10 @@ jQuery(function() {
jQuery('[data-nav-id="' + url + '"]').addClass('visited');
}
}
// finally give initial focus to allow keyboard scrolling in FF
document.querySelector( '#body-inner' ).focus();
psc && psc.scrollbarY.focus();
});
jQuery.extend({