/* Copyright (c) 2006-2007 MetaCarta, Inc., published under the BSD license. * See http://svn.openlayers.org/trunk/openlayers/release-license.txt  * for the full text of the license. *//** * @requires OpenLayers/Control/ZoomBox.js * @requires OpenLayers/Control/DragPan.js * @requires OpenLayers/Handler/MouseWheel.js *  * Class: OpenLayers.Control.Navigation * The navigation control handles map browsing with mouse events (dragging, *     double-clicking, and scrolling the wheel).  Create a new navigation  *     control with the <OpenLayers.Control.Navigation> control.   *  *     Note that this control is added to the map by default (if no controls  *     array is sent in the options object to the <OpenLayers.Map>  *     constructor). *  * Inherits: *  - <OpenLayers.Control> */OpenLayers.Control.Navigation = OpenLayers.Class(OpenLayers.Control, {    /**      * Property: dragPan     * {<OpenLayers.Control.DragPan>}      */    dragPan: null,    /**      * Property: zoomBox     * {<OpenLayers.Control.ZoomBox>}     */    zoomBox: null,    /**      * Property: wheelHandler     * {<OpenLayers.Handler.MouseWheel>}     */    wheelHandler: null,    /**     * Constructor: OpenLayers.Control.Navigation     * Create a new navigation control     *      * Parameters:     * options - {Object} An optional object whose properties will be set on     *                    the control     */    initialize: function(options) {        OpenLayers.Control.prototype.initialize.apply(this, arguments);    },    /**     * Method: activate     */    activate: function() {        this.dragPan.activate();        this.wheelHandler.activate();        this.zoomBox.activate();        return OpenLayers.Control.prototype.activate.apply(this,arguments);    },    /**     * Method: deactivate     */    deactivate: function() {        this.zoomBox.deactivate();        this.dragPan.deactivate();        this.wheelHandler.deactivate();        return OpenLayers.Control.prototype.deactivate.apply(this,arguments);    },        /**     * Method: draw     */    draw: function() {        this.map.events.register( "dblclick", this, this.defaultDblClick );        this.dragPan = new OpenLayers.Control.DragPan({map: this.map});        this.zoomBox = new OpenLayers.Control.ZoomBox(                    {map: this.map, keyMask: OpenLayers.Handler.MOD_SHIFT});        this.dragPan.draw();        this.zoomBox.draw();        this.wheelHandler = new OpenLayers.Handler.MouseWheel(                                    this, {"up"  : this.wheelUp,                                           "down": this.wheelDown} );        this.activate();    },    /**     * Method: defaultDblClick      *      * Parameters:     * evt - {Event}      */    defaultDblClick: function (evt) {        var newCenter = this.map.getLonLatFromViewPortPx( evt.xy );         this.map.setCenter(newCenter, this.map.zoom + 1);        OpenLayers.Event.stop(evt);        return false;    },    /**     * Method: wheelChange       *     * Parameters:     * evt - {Event}     */    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 );    },    /**      * Method: wheelUp     * User spun scroll wheel up     *      * Parameters:     * evt - {Event}     */    wheelUp: function(evt) {        this.wheelChange(evt, 1);    },    /**      * Method: wheelDown     * User spun scroll wheel down     *      * Parameters:     * evt - {Event}     */    wheelDown: function(evt) {        this.wheelChange(evt, -1);    },    CLASS_NAME: "OpenLayers.Control.Navigation"});