# all files / ol/layer/ layer.js

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86.96% Branches 20/23
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     goog.provide('ol.layer.Layer');

    goog.require('goog.events');
    goog.require('goog.events.EventType');
    goog.require('goog.object');
    goog.require('ol');
    goog.require('ol.Object');
    goog.require('ol.layer.Base');
    goog.require('ol.layer.LayerProperty');
    goog.require('ol.render.EventType');
    goog.require('ol.source.State');

    /**
     * @classdesc
     * Abstract base class; normally only used for creating subclasses and not
     * instantiated in apps.
     * A visual representation of raster or vector map data.
     * Layers group together those properties that pertain to how the data is to be
     * displayed, irrespective of the source of that data.
     *
     * Layers are usually added to a map with {@link ol.Map#addLayer}. Components
     * like {@link ol.interaction.Select} use unmanaged layers internally. These
     * unmanaged layers are associated with the map using
     * {@link ol.layer.Layer#setMap} instead.
     *
     * A generic `change` event is fired when the state of the source changes.
     *
     * @constructor
     * @extends {ol.layer.Base}
     * @fires ol.render.Event
     * @param {olx.layer.LayerOptions} options Layer options.
     * @api stable
     */
    ol.layer.Layer = function(options) {

      var baseOptions = goog.object.clone(options);
      delete baseOptions.source;

      goog.base(this, /** @type {olx.layer.LayerOptions} */ (baseOptions));

      /**
       * @private
       * @type {goog.events.Key}
       */
      this.mapPrecomposeKey_ = null;

      /**
       * @private
       * @type {goog.events.Key}
       */
      this.mapRenderKey_ = null;

      /**
       * @private
       * @type {goog.events.Key}
       */
      this.sourceChangeKey_ = null;

      if (options.map) {
        this.setMap(options.map);
      }

      goog.events.listen(this,
          ol.Object.getChangeEventType(ol.layer.LayerProperty.SOURCE),
          this.handleSourcePropertyChange_, false, this);

      var source = options.source ? options.source : null;
      this.setSource(source);
    };
    goog.inherits(ol.layer.Layer, ol.layer.Base);

    /**
     * Return `true` if the layer is visible, and if the passed resolution is
     * between the layer's minResolution and maxResolution. The comparison is
     * inclusive for `minResolution` and exclusive for `maxResolution`.
     * @param {ol.layer.LayerState} layerState Layer state.
     * @param {number} resolution Resolution.
     * @return {boolean} The layer is visible at the given resolution.
     */
    ol.layer.Layer.visibleAtResolution = function(layerState, resolution) {
      return layerState.visible && resolution >= layerState.minResolution &&
          resolution < layerState.maxResolution;
    };

    /**
     * @inheritDoc
     */
    ol.layer.Layer.prototype.getLayersArray = function(opt_array) {
      var array = opt_array ? opt_array : [];
      array.push(this);
      return array;
    };

    /**
     * @inheritDoc
     */
    ol.layer.Layer.prototype.getLayerStatesArray = function(opt_states) {
      var states = opt_states ? opt_states : [];
      states.push(this.getLayerState());
      return states;
    };

    /**
     * Get the layer source.
     * @return {ol.source.Source} The layer source (or `null` if not yet set).
     * @observable
     * @api stable
     */
    ol.layer.Layer.prototype.getSource = function() {
      var source = this.get(ol.layer.LayerProperty.SOURCE);
      return /** @type {ol.source.Source} */ (source) || null;
    };

    /**
      * @inheritDoc
      */
    ol.layer.Layer.prototype.getSourceState = function() {
      var source = this.getSource();
      return !source ? ol.source.State.UNDEFINED : source.getState();
    };

    /**
     * @private
     */
    ol.layer.Layer.prototype.handleSourceChange_ = function() {
      this.changed();
    };

    /**
     * @private
     */
    ol.layer.Layer.prototype.handleSourcePropertyChange_ = function() {
      if (this.sourceChangeKey_) {
        goog.events.unlistenByKey(this.sourceChangeKey_);
        this.sourceChangeKey_ = null;
      }
      var source = this.getSource();
      if (source) {
        this.sourceChangeKey_ = goog.events.listen(source,
            goog.events.EventType.CHANGE, this.handleSourceChange_, false, this);
      }
      this.changed();
    };

    /**
     * Sets the layer to be rendered on top of other layers on a map. The map will
     * not manage this layer in its layers collection, and the callback in
     * {@link ol.Map#forEachLayerAtPixel} will receive `null` as layer. This
     * is useful for temporary layers. To remove an unmanaged layer from the map,
     * use `#setMap(null)`.
     *
     * To add the layer to a map and have it managed by the map, use
     * {@link ol.Map#addLayer} instead.
     * @param {ol.Map} map Map.
     * @api
     */
    ol.layer.Layer.prototype.setMap = function(map) {
      goog.events.unlistenByKey(this.mapPrecomposeKey_);
      this.mapPrecomposeKey_ = null;
      if (!map) {
        this.changed();
      }
      goog.events.unlistenByKey(this.mapRenderKey_);
      this.mapRenderKey_ = null;
      if (map) {
        this.mapPrecomposeKey_ = goog.events.listen(
            map, ol.render.EventType.PRECOMPOSE, function(evt) {
              var layerState = this.getLayerState();
              layerState.managed = false;
              layerState.zIndex = Infinity;
              evt.frameState.layerStatesArray.push(layerState);
              evt.frameState.layerStates[goog.getUid(this)] = layerState;
            }, false, this);
        this.mapRenderKey_ = goog.events.listen(
            this, goog.events.EventType.CHANGE, map.render, false, map);
        this.changed();
      }
    };

    /**
     * Set the layer source.
     * @param {ol.source.Source} source The layer source.
     * @observable
     * @api stable
     */
    ol.layer.Layer.prototype.setSource = function(source) {
      this.set(ol.layer.LayerProperty.SOURCE, source);
    };