[examples] add an accessible-panel example

kochizufan · Feb 28, 2012 · aedc96f · aedc96f
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diff --git a/examples/accessible-panel.html b/examples/accessible-panel.html
@@ -0,0 +1,124 @@
+<!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>
diff --git a/examples/accessible-panel.js b/examples/accessible-panel.js
@@ -0,0 +1,64 @@
+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);
+}