97 lines
2.2 KiB
JavaScript
97 lines
2.2 KiB
JavaScript
goog.provide('ol.layer.Layer');
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goog.require('goog.asserts');
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goog.require('goog.events');
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goog.require('goog.events.EventType');
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goog.require('goog.object');
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goog.require('ol.layer.Base');
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goog.require('ol.source.Source');
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/**
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* @constructor
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* @extends {ol.layer.Base}
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* @fires ol.render.Event
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* @fires change Triggered when the state of the source changes.
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* @param {olx.layer.LayerOptions} options Layer options.
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* @todo api
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*/
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ol.layer.Layer = function(options) {
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var baseOptions = goog.object.clone(options);
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delete baseOptions.source;
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goog.base(this, /** @type {olx.layer.LayerOptions} */ (baseOptions));
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/**
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* @private
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* @type {ol.source.Source}
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*/
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this.source_ = options.source;
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goog.events.listen(this.source_, goog.events.EventType.CHANGE,
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this.handleSourceChange_, false, this);
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};
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goog.inherits(ol.layer.Layer, ol.layer.Base);
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/**
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* Return `true` if the layer is visible, and if the passed resolution is
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* between the layer's minResolution and maxResolution. The comparison is
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* inclusive for `minResolution` and exclusive for `maxResolution`.
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* @param {ol.layer.LayerState} layerState Layer state.
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* @param {number} resolution Resolution.
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* @return {boolean} The layer is visible at the given resolution.
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*/
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ol.layer.Layer.visibleAtResolution = function(layerState, resolution) {
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return layerState.visible && resolution >= layerState.minResolution &&
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resolution < layerState.maxResolution;
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};
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/**
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* @inheritDoc
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*/
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ol.layer.Layer.prototype.getLayersArray = function(opt_array) {
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var array = (goog.isDef(opt_array)) ? opt_array : [];
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array.push(this);
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return array;
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};
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/**
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* @inheritDoc
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*/
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ol.layer.Layer.prototype.getLayerStatesArray = function(opt_states) {
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var states = (goog.isDef(opt_states)) ? opt_states : [];
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states.push(this.getLayerState());
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return states;
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};
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/**
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* @return {ol.source.Source} Source.
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* @todo api
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*/
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ol.layer.Layer.prototype.getSource = function() {
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return this.source_;
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};
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/**
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* @inheritDoc
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*/
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ol.layer.Layer.prototype.getSourceState = function() {
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return this.getSource().getState();
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};
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/**
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* @private
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*/
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ol.layer.Layer.prototype.handleSourceChange_ = function() {
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this.dispatchChangeEvent();
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};
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