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add permalink functionality from USGS project #172

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add permalink functionality from USGS project #172

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51 changes: 51 additions & 0 deletions src/script/widgets/Viewer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,12 @@ gxp.Viewer = Ext.extend(Ext.util.Observable, {
* ``GeoExt.MapPanel``
*/

/** api: config[permalink]
* Should we update window.location.hash with info about the map's
* center and the zoom level? Defaults to false.
*/
permalink: false,

/** api: config[proxy]
* ``String`` An optional proxy url which can be used to bypass the same
* origin policy. This will be set as ``OpenLayers.ProxyHost``.
Expand Down Expand Up @@ -318,8 +324,31 @@ gxp.Viewer = Ext.extend(Ext.util.Observable, {
* any configuration before applyConfig is called.
*/
loadConfig: function(config) {
if (this.permalink === true) {
var urlConfig = this.getUrlConfig();
if (urlConfig.z != null) {
config.map.zoom = urlConfig.z;
}
if (urlConfig.c != null) {
config.map.center = urlConfig.c.split(",");
}
}
this.applyConfig(config);
},

/** private[method] getUrlConfig
* Gets the url config from the anchor/hash in the url.
*
* :returns: ``Object`` Object containing the values for c (center),
* z (zoom level).
*/
getUrlConfig: function(){
var hash = window.location.hash, urlConfig = {};
if (hash) {
Ext.apply(urlConfig, Ext.urlDecode(hash.substr(1)));
}
return urlConfig;
},

applyConfig: function(config) {
this.initialConfig = Ext.apply({}, config);
Expand Down Expand Up @@ -527,6 +556,22 @@ gxp.Viewer = Ext.extend(Ext.util.Observable, {
}), config.renderTo ? "panel" : "viewport");

this.fireEvent("portalready");

if (this.permalink === true) {
var map = this.mapPanel.map;
map.events.register("moveend", this, this.updateHash);
}
},

/** private: method[updateHash]
* Update the hash on moveend.
*/
updateHash: function() {
var map = this.mapPanel.map;
var urlConfig = this.getUrlConfig();
urlConfig.c = map.getCenter().toShortString().replace(" ", "");
urlConfig.z = map.getZoom();
window.location.hash = Ext.urlEncode(urlConfig);
},

activate: function() {
Expand Down Expand Up @@ -836,6 +881,12 @@ gxp.Viewer = Ext.extend(Ext.util.Observable, {
/** api: method[destroy]
*/
destroy: function() {
if (this.permalink === true) {
var map = this.mapPanel.map;
if (map && map.events) {
map.events.unregister("moveend", this, this.updateHash);
}
}
//TODO there is probably more that needs to be destroyed
this.mapPanel.destroy();
this.portal && this.portal.destroy();
Expand Down