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Progress bar for tile loading

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This commit is contained in:
Tim Schaub
2015-02-16 23:00:12 -07:00
parent 5cbae8c8f5
commit 77d8d48b57
2 changed files with 94 additions and 14 deletions
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17
examples/tile-load-events.html
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@@ -9,6 +9,20 @@
<link rel="stylesheet" href="../resources/layout.css" type="text/css">
<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap-responsive.min.css" type="text/css">
<title>Tile load events example</title>
<style>
.wrapper {
position: relative;
}
#progress {
position: absolute;
bottom: 0;
left: 0;
height: 2px;
background: rgba(0, 60, 136, 0.4);
width: 0;
transition: width 250ms;
}
</style>
</head>
<body>
@@ -23,8 +37,9 @@
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div class="span12 wrapper">
<div id="map" class="map"></div>
<div id="progress"></div>
</div>
</div>

91
examples/tile-load-events.js
View File

@@ -1,31 +1,96 @@
goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.control');
goog.require('ol.layer.Tile');
goog.require('ol.source.OSM');
/**
* Renders a progress bar.
* @param {Element} el The target element.
* @constructor
*/
function Progress(el) {
this.el = el;
this.loading = 0;
this.loaded = 0;
}
/**
* Increment the count of loading tiles.
*/
Progress.prototype.addLoading = function() {
if (this.loading === 0) {
this.show();
}
++this.loading;
this.update();
};
/**
* Increment the count of loaded tiles.
*/
Progress.prototype.addLoaded = function() {
setTimeout(function() {
++this.loaded;
this.update();
}.bind(this), 100);
};
/**
* Update the progress bar.
*/
Progress.prototype.update = function() {
var width = (this.loaded / this.loading * 100).toFixed(1) + '%';
this.el.style.width = width;
if (this.loading === this.loaded) {
this.loading = 0;
this.loaded = 0;
setTimeout(this.hide.bind(this), 500);
}
};
/**
* Show the progress bar.
*/
Progress.prototype.show = function() {
this.el.style.visibility = 'visible';
};
/**
* Hide the progress bar.
*/
Progress.prototype.hide = function() {
if (this.loading === this.loaded) {
this.el.style.visibility = 'hidden';
this.el.style.width = 0;
}
};
var progress = new Progress(document.getElementById('progress'));
var source = new ol.source.OSM();
source.on('tileloadstart', function(event) {
console.log('start', event.tile.getImage().src);
});
source.on('tileloadend', function(event) {
console.log('end', event.tile.getImage().src);
});
source.on('tileloaderror', function(event) {
console.log('error', event.tile.getImage().src);
progress.addLoading();
});
source.on('tileloadend', function(event) {
progress.addLoaded();
});
source.on('tileloaderror', function(event) {
progress.addLoaded();
});
var map = new ol.Map({
layers: [
new ol.layer.Tile({source: source})
],
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
renderer: exampleNS.getRendererFromQueryString(),
target: 'map',
view: new ol.View({