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[examples] add an accessible-panel example

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Éric Lemoine
2012-02-07 17:19:49 +01:00
parent e551fc672c
commit aedc96f030
2 changed files with 188 additions and 0 deletions
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<title>Custom and accessible panel</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">
.olControlPanel button {
position: relative;
display: block;
margin: 2px;
border: 1px solid;
padding: 0 5px;
border-radius: 4px;
height: 35px;
background-color: white;
float: left;
overflow: visible; /* needed to remove padding from buttons in IE */
}
.olControlPanel button span {
padding-left: 25px;
}
.olControlPanel button span:first-child {
padding-left: 0;
display: block;
position: absolute;
left: 2px;
}
.olControlPanel .olControlDrawFeatureItemActive span:first-child {
background-image: url("../theme/default/img/draw_line_on.png");
height: 22px;
width: 24px;
top: 5px;
}
.olControlPanel .olControlDrawFeatureItemInactive span:first-child {
background-image: url("../theme/default/img/draw_line_off.png");
height: 22px;
width: 24px;
top: 5px;
}
.olControlPanel .olControlZoomBoxItemInactive span:first-child {
background-image: url("../img/drag-rectangle-off.png");
height: 29px;
width: 29px;
top: 2px;
}
.olControlPanel .olControlZoomBoxItemActive span:first-child {
background-image: url("../img/drag-rectangle-on.png");
height: 29px;
width: 29px;
top: 2px;
}
.olControlPanel .olControlZoomToMaxExtentItemInactive span:first-child {
background-image: url("../img/zoom-world-mini.png");
height: 18px;
width: 18px;
top: 8px;
}
.olControlPanel .navHistory span:first-child {
background-image: url("../theme/default/img/navigation_history.png");
height: 24px;
width: 24px;
top: 4px;
}
.olControlPanel .navHistoryPreviousItemActive span:first-child {
background-position: 0 0;
}
.olControlPanel .navHistoryPreviousItemInactive span:first-child {
background-position: 0 -24px;
}
.olControlPanel .navHistoryNextItemActive span:first-child {
background-position: -24px 0;
}
.olControlPanel .navHistoryNextItemInactive span:first-child {
background-position: -24px -24px;
}
</style>
<script src="../lib/OpenLayers.js"></script>
<script src="accessible-panel.js"></script>
</head>
<body onload="init()">
<h1 id="title">Custom and accessible panel</h1>
<div id="tags">
panels, CSS, style, accessibility, button
</div>
<p id="shortdesc">
Create a custom and accessible panel, styled entirely with
CSS.
</p>
<div id="panel"></div>
<div id="map" class="smallmap"></div>
<div id="docs">
<p>Accessibility:
<ul>
<li>The buttons are actual HTML buttons. You can therefore
use the TAB key to give the focus to the panel's buttons, and the "ENTER"
key to activate or trigger the corresponding control.</li>
<li>The buttons include text and titles (displayed when a button
is hovered).</li>
<li>If you remove colors from the page (for example using FireFox's <a
href="https://addons.mozilla.org/en-US/firefox/addon/no-color/">No
Color extension</a>) the buttons are still visible, and
accessible using the keyboard.</li>
</ul>
</p>
<p>By default a panel creates buttons as divs. In this example the
<code>createControlMarkup</code> panel function is overridden to create
a more accessible markup for the buttons. See the <a
href="accessible-panel.js" target="_blank"> accessible-panel.js
source</a> to see how this is done.</p>
</div>
</body>
</html>

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var lon = 5;
var lat = 40;
var zoom = 5;
var map, layer;
function init() {
map = new OpenLayers.Map( 'map', { controls: [] } );
layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'} );
map.addLayer(layer);
vlayer = new OpenLayers.Layer.Vector( "Editable" );
map.addLayer(vlayer);
zb = new OpenLayers.Control.ZoomBox({
title: "Zoom box: zoom clicking and dragging",
text: "Zoom"
});
var panel = new OpenLayers.Control.Panel({
defaultControl: zb,
createControlMarkup: function(control) {
var button = document.createElement('button'),
iconSpan = document.createElement('span'),
textSpan = document.createElement('span');
iconSpan.innerHTML = '&nbsp;';
button.appendChild(iconSpan);
if (control.text) {
textSpan.innerHTML = control.text;
}
button.appendChild(textSpan);
return button;
}
});
panel.addControls([
zb,
new OpenLayers.Control.DrawFeature(vlayer, OpenLayers.Handler.Path,
{title:'Draw a feature', text: 'Draw'}),
new OpenLayers.Control.ZoomToMaxExtent({
title:"Zoom to the max extent",
text: "World"
})
]);
nav = new OpenLayers.Control.NavigationHistory({
previousOptions: {
title: "Go to previous map position",
text: "Prev"
},
nextOptions: {
title: "Go to next map position",
text: "Next"
},
displayClass: "navHistory"
});
// parent control must be added to the map
map.addControl(nav);
panel.addControls([nav.next, nav.previous]);
map.addControl(panel);
map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);
}