optimize mousemove listener. fixes select2#1328

ivaynberg · ivaynberg · commit 70f1b2988251 · 2013-05-17T08:14:09.000-07:00
diff --git a/select2.js b/select2.js
@@ -47,7 +47,7 @@ the specific language governing permissions and limitations under the Apache Lic
     }
 
     var KEY, AbstractSelect2, SingleSelect2, MultiSelect2, nextUid, sizer,
-        lastMousePosition, $document, scrollBarDimensions,
+        lastMousePosition={x:0,y:0}, $document, scrollBarDimensions,
 
     KEY = {
         TAB: 9,
@@ -172,7 +172,8 @@ the specific language governing permissions and limitations under the Apache Lic
     }
 
     $document.on("mousemove", function (e) {
-        lastMousePosition = {x: e.pageX, y: e.pageY};
+        lastMousePosition.x = e.pageX;
+        lastMousePosition.y = e.pageY;
     });
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -47,7 +47,7 @@ the specific language governing permissions and limitations under the Apache Lic`
`47`	`47`	`}`
`48`	`48`
`49`	`49`	`var KEY, AbstractSelect2, SingleSelect2, MultiSelect2, nextUid, sizer,`
`50`		`- lastMousePosition, $document, scrollBarDimensions,`
	`50`	`+ lastMousePosition={x:0,y:0}, $document, scrollBarDimensions,`
`51`	`51`
`52`	`52`	`KEY = {`
`53`	`53`	`TAB: 9,`
`@@ -172,7 +172,8 @@ the specific language governing permissions and limitations under the Apache Lic`
`172`	`172`	`}`
`173`	`173`
`174`	`174`	`$document.on("mousemove", function (e) {`
`175`		`- lastMousePosition = {x: e.pageX, y: e.pageY};`
	`175`	`+ lastMousePosition.x = e.pageX;`
	`176`	`+ lastMousePosition.y = e.pageY;`
`176`	`177`	`});`
`177`	`178`
`178`	`179`	`/**`