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With Erik's approval on #341, I'm happy with this. This restores the

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mousewheel functionality we had in earlier releases in a similar way, rewritten
for handlers. (The benefit of handlers in this case is that handlers are 
write-once, use many, so the next mousewheel thing we get will *also* be able 
to use this code.)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@2877 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
crschmidt
2007-03-24 23:11:18 +00:00
parent b22958ff2e
commit b6e783fb66
2 changed files with 30 additions and 6 deletions
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21
lib/OpenLayers/Control/Navigation.js
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@@ -59,20 +59,33 @@ OpenLayers.Control.Navigation.prototype =
return false;
},
wheelChange: function(evt, deltaZ) {
var newZoom = this.map.getZoom() + deltaZ;
if (!this.map.isValidZoomLevel(newZoom)) return;
var size = this.map.getSize();
var deltaX = size.w/2 - evt.xy.x;
var deltaY = evt.xy.y - size.h/2;
var newRes = this.map.baseLayer.resolutions[newZoom];
var zoomPoint = this.map.getLonLatFromPixel(evt.xy);
var newCenter = new OpenLayers.LonLat(
zoomPoint.lon + deltaX * newRes,
zoomPoint.lat + deltaY * newRes );
this.map.setCenter( newCenter, newZoom );
},
/** User spun scroll wheel up
*
*/
wheelUp: function(evt) {
this.map.setCenter(this.map.getLonLatFromPixel(evt.xy),
this.map.getZoom() + 1);
this.wheelChange(evt, 1);
},
/** User spun scroll wheel down
*
*/
wheelDown: function(evt) {
this.map.setCenter(this.map.getLonLatFromPixel(evt.xy),
this.map.getZoom() - 1);
this.wheelChange(evt, -1);
},
/** @final @type String */