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L.Control.Permalink = L.Control.extend({
includes: L.Mixin.Events,
options: {
position: 'bottomleft',
useAnchor: true,
useLocation: false,
text: 'Permalink'
},
initialize: function(options) {
L.Util.setOptions(this, options);
this._params = {};
this._set_urlvars();
this.on('update', this._set_center, this);
for (var i in this) {
if (typeof(i) === 'string' && i.indexOf('initialize_') === 0)
this[i]();
}
},
onAdd: function(map) {
this._container = L.DomUtil.create('div', 'leaflet-control-attribution leaflet-control-permalink');
L.DomEvent.disableClickPropagation(this._container);
this._map = map;
this._href = L.DomUtil.create('a', null, this._container);
this._href.innerHTML = this.options.text;
map.on('moveend', this._update_center, this);
this.fire('update', {params: this._params});
this._update_center();
if (this.options.useAnchor && 'onhashchange' in window) {
var _this = this, fn = window.onhashchange;
window.onhashchange = function() {
_this._set_urlvars();
if (fn) return fn();
};
}
this.fire('add', {map: map});
return this._container;
},
_update_center: function() {
if (!this._map) return;
var center = this._round_point(this._map.getCenter());
this._update({zoom: this._map.getZoom(), lat: center.lat, lon: center.lng});
},
_update_href: function() {
var params = L.Util.getParamString(this._params);
var sep = '?';
if (this.options.useAnchor) sep = '#';
var url = this._url_base + sep + params.slice(1);
if (this._href) this._href.setAttribute('href', url);
if (this.options.useLocation)
location.replace('#' + params.slice(1));
return url;
},
_round_point : function(point) {
var bounds = this._map.getBounds(), size = this._map.getSize();
var ne = bounds.getNorthEast(), sw = bounds.getSouthWest();
var round = function (x, p) {
if (p === 0) return x;
var shift = 1;
while (p < 1 && p > -1) {
x *= 10;
p *= 10;
shift *= 10;
}
return Math.floor(x)/shift;
};
point.lat = round(point.lat, (ne.lat - sw.lat) / size.y);
point.lng = round(point.lng, (ne.lng - sw.lng) / size.x);
return point;
},
_update: function(obj, source) {
for(var i in obj) {
if (!obj.hasOwnProperty(i)) continue;
if (obj[i] !== null && obj[i] !== undefined)
this._params[i] = obj[i];
else
delete this._params[i];
}
this._update_href();
},
_set_urlvars: function()
{
this._url_base = window.location.href.split('#')[0].split('?')[0];
var p;
if (this.options.useAnchor)
p = L.UrlUtil.queryParse(L.UrlUtil.hash());
else
p = L.UrlUtil.queryParse(L.UrlUtil.query());
function eq(x, y) {
for(var i in x)
if (x.hasOwnProperty(i) && x[i] !== y[i])
return false;
return true;
}
if (eq(p, this._params) && eq(this._params, p))
return;
this._params = p;
this._update_href();
this.fire('update', {params: this._params});
},
_set_center: function(e)
{
var params = e.params;
if (params.zoom === undefined ||
params.lat === undefined ||
params.lon === undefined) return;
this._map.setView(new L.LatLng(params.lat, params.lon), params.zoom);
}
});
L.UrlUtil = {
queryParse: function(s) {
var p = {};
var sep = '&';
if (s.search('&') !== -1)
sep = '&';
var params = s.split(sep);
for(var i = 0; i < params.length; i++) {
var tmp = params[i].split('=');
if (tmp.length !== 2) continue;
p[tmp[0]] = decodeURI(tmp[1]);
}
return p;
},
query: function() {
var href = window.location.href.split('#')[0], idx = href.indexOf('?');
if (idx < 0)
return '';
return href.slice(idx+1);
},
hash: function() { return window.location.hash.slice(1); },
updateParamString: function (q, obj) {
var p = L.UrlUtil.queryParse(q);
for (var i in obj) {
if (obj.hasOwnProperty(i))
p[i] = obj[i];
}
return L.Util.getParamString(p).slice(1);
}
};
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