nc-gpxedit/js/ActiveLayers.js

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2016-11-30 19:00:03 +00:00
/**
* Created: vogdb Date: 5/4/13 Time: 1:54 PM
* Version: 0.3.0
*/
L.Control.ActiveLayers = L.Control.Layers.extend({
/**
* Get currently active base layer on the map
* @return {Object} l where l.name - layer name on the control,
* l.layer is L.TileLayer, l.overlay is overlay layer.
*/
getActiveBaseLayer: function () {
return this._activeBaseLayer
},
/**
* Get currently active overlay layers on the map
* @return {{layerId: l}} where layerId is <code>L.stamp(l.layer)</code>
* and l @see #getActiveBaseLayer jsdoc.
*/
getActiveOverlayLayers: function () {
return this._activeOverlayLayers
},
onAdd: function (map) {
var container = L.Control.Layers.prototype.onAdd.call(this, map)
if (Array.isArray(this._layers)) {
this._activeBaseLayer = this._findActiveBaseLayer()
this._activeOverlayLayers = this._findActiveOverlayLayers()
} else { // 0.7.x
this._activeBaseLayer = this._findActiveBaseLayerLegacy()
this._activeOverlayLayers = this._findActiveOverlayLayersLegacy()
}
return container
},
_findActiveBaseLayer: function () {
var layers = this._layers
for (var i = 0; i < layers.length; i++) {
var layer = layers[i]
if (!layer.overlay && this._map.hasLayer(layer.layer)) {
return layer
}
}
throw new Error('Control doesn\'t have any active base layer!')
},
_findActiveOverlayLayers: function () {
var result = {}
var layers = this._layers
for (var i = 0; i < layers.length; i++) {
var layer = layers[i]
if (layer.overlay && this._map.hasLayer(layer.layer)) {
result[layer.layer._leaflet_id] = layer
}
}
return result
},
/**
* Legacy 0.7.x support methods
*/
_findActiveBaseLayerLegacy: function () {
var layers = this._layers
for (var layerId in layers) {
if (this._layers.hasOwnProperty(layerId)) {
var layer = layers[layerId]
if (!layer.overlay && this._map.hasLayer(layer.layer)) {
return layer
}
}
}
throw new Error('Control doesn\'t have any active base layer!')
},
_findActiveOverlayLayersLegacy: function () {
var result = {}
var layers = this._layers
for (var layerId in layers) {
if (this._layers.hasOwnProperty(layerId)) {
var layer = layers[layerId]
if (layer.overlay && this._map.hasLayer(layer.layer)) {
result[layerId] = layer
}
}
}
return result
},
_onLayerChange: function () {
L.Control.Layers.prototype._onLayerChange.apply(this, arguments)
this._recountLayers()
},
_onInputClick: function () {
this._handlingClick = true
this._recountLayers()
L.Control.Layers.prototype._onInputClick.call(this)
this._handlingClick = false
},
_recountLayers: function () {
var i, input, obj,
inputs = this._form.getElementsByTagName('input'),
inputsLen = inputs.length;
for (i = 0; i < inputsLen; i++) {
input = inputs[i]
if (Array.isArray(this._layers)) {
obj = this._layers[i]
} else {
obj = this._layers[input.layerId] // 0.7.x
}
if (input.checked && !this._map.hasLayer(obj.layer)) {
if (obj.overlay) {
this._activeOverlayLayers[input.layerId] = obj
} else {
this._activeBaseLayer = obj
}
} else if (!input.checked && this._map.hasLayer(obj.layer)) {
if (obj.overlay) {
delete this._activeOverlayLayers[input.layerId]
}
}
}
}
})
L.control.activeLayers = function (baseLayers, overlays, options) {
return new L.Control.ActiveLayers(baseLayers, overlays, options)
}