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No magic for loadend delay

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This change reintroduces the removeBackBufferDelay, and documents exactly
what it does and when it may be useful.
This commit is contained in:
ahocevar
2012-12-14 17:27:08 +01:00
parent 1764bbdd18
commit f51211e93f
1 changed files with 28 additions and 10 deletions
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38
lib/OpenLayers/Layer/Grid.js
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@@ -189,6 +189,17 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
*/
backBufferLonLat: null,
/**
* APIProperty: removeBackBufferDelay
* {Number} Delay in ms for removing the backbuffer when all tiles have
* finished loading. Usually a value of 0 works fine. For slow mobile
* devices, when using <singleTile> layers with big image sizes, a delay
* of 40-50ms may help to avoid flickers after panning. Default is 0.
* If set, the layer's loadend event will also be delayed when a
* backbuffer needs to be removed.
*/
removeBackBufferDelay: 0,
/**
* APIProperty: className
* {String} Name of the class added to the layer div. If not set in the
@@ -1098,17 +1109,15 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
});
//if that was the last tile, then trigger a 'loadend' on the layer
if (this.tileQueue.length === 0 && this.numLoadingTiles === 0) {
// give the last tile time to render before firing loadend and
// removing the backbuffer.
var delay = this.tileSize.w * this.tileSize.h / 32768;
var that = this;
window.setTimeout(function() {
that.loading = false;
that.events.triggerEvent("loadend");
if(that.backBuffer) {
if (this.backBuffer) {
var that = this;
window.setTimeout(function() {
that.onLoadEnd();
that.removeBackBuffer();
}
}, delay);
}, this.removeBackBufferDelay);
} else {
this.onLoadEnd();
}
}
};
@@ -1125,6 +1134,15 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
});
},
/**
* Method: onLoadEnd
* Sets the loading flag to false and triggers the loadend event.
*/
onLoadEnd: function() {
this.loading = false;
this.events.triggerEvent("loadend");
},
/**
* Method: removeTileMonitoringHooks
* This function takes a tile as input and removes the tile hooks