Gutting the OverviewMap control to give it an update. Now uses a click handler and a drag handler instead of its own event handling code. In addition, the control now has a minRecSize property. When the extent rectangle is smaller than the specified size, its style is switched. By default, we provide a rectangle replacement graphic. This can be customized with CSS. Finally, I'm tucking in one non-API property. The dragging arg sent to map.setCenter is now stored at map.dragging. This gives easy reference to dragging state where a reference to the navigation control and its drag handler is not convenient. r=pspencer (closes #1244)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5674 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

theme/default/style.css

@@ -64,9 +64,19 @@ div.olControlMousePosition {
 }
 
 .olControlOverviewMapExtentRectangle {
-   cursor: move;
+    overflow: hidden;
+    background-image: url("img/blank.gif");
+    cursor: move;
     border: 2px dotted red;
 }
+.olControlOverviewMapRectReplacement {
+    overflow: hidden;
+    cursor: move;
+    background-image: url("img/overview_replacement.gif");
+    background-repeat: no-repeat;
+    background-position: center;
+}
+
 .olLayerGeoRSSDescription {
     float:left;
     width:100%;