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Add hover handler. With this handler user-defined actions can be triggered as the mouse moves over the map and pauses. An example of use is send WMS/GetFeatureInfo requests. r=crschmidt,tschaub (closes #1255)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@5746 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
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Éric Lemoine
2008-01-15 12:54:47 +00:00
parent c1185e8f8b
commit f053a4e0c8
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>OpenLayers Hover Handler Example</title>
<style type="text/css">
#map {
width: 340px;
height: 170px;
border: 1px solid gray;
}
#west {
width: 350px;
}
#east {
position: absolute;
left: 370px;
top: 3em;
}
table td {
text-align: center;
margin: 0;
border: 1px solid gray;
}
textarea.output {
text-align: left;
font-size: 0.9em;
width: 250px;
height: 65px;
overflow: auto;
}
</style>
<script src="../lib/Firebug/firebug.js"></script>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
OpenLayers.Control.Hover = OpenLayers.Class(OpenLayers.Control, {
defaultHandlerOptions: {
'delay': 500,
'pixelTolerance': null,
'stopMove': false
},
initialize: function(options) {
this.handlerOptions = OpenLayers.Util.extend(
{}, this.defaultHandlerOptions
);
OpenLayers.Control.prototype.initialize.apply(
this, arguments
);
this.handler = new OpenLayers.Handler.Hover(
this,
{'pause': this.onPause, 'move': this.onMove},
this.handlerOptions
);
},
onPause: function(evt) {
var output = document.getElementById(this.key + 'Output');
var msg = 'pause ' + evt.xy;
output.value = output.value + msg + "\r\n";
},
onMove: function(evt) {
// if this control sent an Ajax request (e.g. GetFeatureInfo) when
// the mouse pauses the onMove callback could be used to abort that
// request.
}
});
var map, controls;
function init(){
map = new OpenLayers.Map('map');
var layer = new OpenLayers.Layer.WMS(
'OpenLayers WMS',
'http://labs.metacarta.com/wms/vmap0',
{layers: 'basic'}
);
map.addLayers([layer]);
controls = {
'long': new OpenLayers.Control.Hover({
handlerOptions: {
'delay': 2000
}
}),
'short': new OpenLayers.Control.Hover({
handlerOptions: {
'delay': 100
}
}),
'tolerant': new OpenLayers.Control.Hover({
handlerOptions: {
'delay': 1000,
'pixelTolerance': 6
}
}),
'untolerant': new OpenLayers.Control.Hover({
handlerOptions: {
'delay': 1000,
'pixelTolerance': 1
}
}),
'stoppropag': new OpenLayers.Control.Hover({
handlerOptions: {
'stopMove': true
}
})
};
var props = document.getElementById("props");
var control;
for(var key in controls) {
control = controls[key];
// only to route output here
control.key = key;
map.addControl(control);
}
map.zoomToMaxExtent();
}
function toggle(key) {
var control = controls[key];
if(control.active) {
control.deactivate();
} else {
control.activate();
}
var status = document.getElementById(key + "Status");
status.innerHTML = control.active ? "on" : "off";
var output = document.getElementById(key + "Output");
output.value = "";
}
</script>
</head>
<body onload="init()">
<h1 id="title">Hover Handler Example</h1>
<div id="west">
<div id="tags">
</div>
<p id="shortdesc">
This example shows the use of the hover handler.
</p>
<div id="map"></div>
<p>
The hover handler is to be used to emulate mouseovers on
objects on the map that aren't DOM elements. For example
one can use the hover hander to send WMS/GetFeatureInfo
requests as the user moves the mouse over the map.
</p>
<p>
The "delay" option specifies the number of milliseconds
before the event is considered a hover. Default is 500
milliseconds.
</p>
<p>
The "pixelTolerance" option specifies the maximum number
of pixels between mousemoves for an event to be
considered a hover. Default is null, which means no
pixel tolerance.
</p>
<p>
The "stopMove" option specifies whether other mousemove
listeners registered before the hover handler listener must
be notified on mousemoves or not. Default is false (meaning
that the other mousemove listeners will be notified on
mousemove).
</p>
</div>
<div id="east">
<table>
<caption>Controls with hover handlers (toggle on/off to clear output)</caption>
<tbody>
<tr>
<td>long delay (2 sec)</td>
<td><button id="longStatus" onclick="toggle('long')">off</button></td>
<td><textarea class="output" id="longOutput"></textarea></td>
</tr>
<tr>
<td>short delay (100 msec)</td>
<td><button id="shortStatus" onclick="toggle('short')">off</button></td>
<td><textarea class="output" id="shortOutput"></textarea></td>
</tr>
<tr>
<td>tolerant (6 pixels)</td>
<td><button id="tolerantStatus" onclick="toggle('tolerant')">off</button></td>
<td><textarea class="output" id="tolerantOutput"></textarea></td>
</tr>
<tr>
<td>untolerant (1 pixel)</td>
<td><button id="untolerantStatus" onclick="toggle('untolerant')">off</button></td>
<td><textarea class="output" id="untolerantOutput"></textarea></td>
</tr>
<tr>
<td>stop propagation</td>
<td><button id="stoppropagStatus" onclick="toggle('stoppropag')">off</button></td>
<td><textarea class="output" id="stoppropagOutput"></textarea></td>
</tr>
</tbody>
</table>
</div>
</body>
</html>