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rewrite of Untiled.js to only create the div's once, and from then on just modify the attributes. this should be faster.

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@930 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
euzuro
2006-07-11 12:17:59 +00:00
parent 1fa74c7c68
commit d747bc1d83
1 changed files with 97 additions and 27 deletions
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124
lib/OpenLayers/Layer/WMS/Untiled.js
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@@ -89,6 +89,15 @@ OpenLayers.Layer.WMS.Untiled.prototype =
},
/** Once HTTPRequest has set the map, we can load the image div
*
* @param {OpenLayers.Map} map
*/
setMap: function(map) {
OpenLayers.Layer.HTTPRequest.prototype.setMap.apply(this, arguments);
this.loadImageDiv();
},
/** When it is not a minor move (ie when panning or when done dragging)
* reload and recenter the div.
*
@@ -98,61 +107,122 @@ OpenLayers.Layer.WMS.Untiled.prototype =
*/
moveTo:function(bounds, zoomChanged, minor) {
if (!minor) {
if (bounds == null) {
bounds = this.map.getExtent();
}
var size = this.map.getSize().copyOf();
//get the url
// get the url
var url = this.getFullRequestString( {BBOX: bounds.toBBOX(),
WIDTH: size.w,
HEIGHT: size.h} );
//clear previous wms image
this.div.innerHTML = "";
//always position at upper left corner of current viewspace
// always position at upper left corner of current viewspace
var tl = new OpenLayers.Pixel(0,0);
var pos = this.map.getLayerPxFromViewPortPx(tl);
//create div
if (this.transparent) {
this.imgDiv = OpenLayers.Util.createAlphaImageDiv(null,
pos,
size,
url,
"absolute");
} else {
this.imgDiv = OpenLayers.Util.createImage(null,
pos,
size,
url,
"absolute");
}
this.div.appendChild(this.imgDiv);
// first hide before all modifications
Element.hide(this.imgDiv);
// update div
var img = this.imgDiv;
if (this.transparent) {
OpenLayers.Util.modifyAlphaImageDiv(this.imgDiv,
null,
pos,
size,
url);
img = this.imgDiv.childNodes[0];
} else {
OpenLayers.Util.modifyDOMElement(this.imgDiv,
null,
pos,
size);
this.imgDiv.src = url;
}
// wait until image is done loading to show again
Event.observe(img,
"load",
this.showDiv.bindAsEventListener(this));
}
},
/**
/** Helper function that allows us to first hide the imgDiv, then make all
* the changes (position, size, url). Then when the url is done loading,
* we call this function to show the imgDiv.
*
* @private
*/
showDiv: function() {
Element.show(this.imgDiv);
},
/** Once HTTPRequest has updated the url, reload the image div
* @param {String} newUrl
*/
setUrl: function(newUrl) {
OpenLayers.Layer.HTTPRequest.prototype.setUrl.apply(this, arguments);
this.moveTo(this.map.getExtent());
this.moveTo();
},
/**
/** Once HTTPRequest has updated new params, reload the image div
* @param {Object} newParams
*/
mergeNewParams:function(newParams) {
OpenLayers.Layer.HTTPRequest.prototype.mergeNewParams.apply(this,
arguments);
this.moveTo(this.map.getExtent());
this.moveTo();
},
/** This function first removes the previous image div, then adds a new
* one according to the transparency property.
*
* @private
*/
loadImageDiv: function() {
var size = this.map.getSize().copyOf();
var bounds = this.map.getExtent();
var url = "";
if (bounds != null) {
url = this.getFullRequestString( {BBOX: bounds.toBBOX(),
WIDTH: size.w,
HEIGHT: size.h} );
}
//clear previous wms image (removes imgDiv)
this.div.innerHTML = "";
//always position at upper left corner of current viewspace
var tl = new OpenLayers.Pixel(0,0);
var pos = this.map.getLayerPxFromViewPortPx(tl);
//create div
if (this.transparent) {
this.imgDiv = OpenLayers.Util.createAlphaImageDiv(null,
pos,
size,
url,
"absolute");
} else {
this.imgDiv = OpenLayers.Util.createImage(null,
pos,
size,
url,
"absolute");
}
this.div.appendChild(this.imgDiv);
},
/** @final @type String */
CLASS_NAME: "OpenLayers.Layer.WMS.Untiled"
});