221967cc3f
With this patch you should no longer see tiles loading if your layer is out of range or not visible. Hopefully! r=crschmidt (closes #937) git-svn-id: http://svn.openlayers.org/trunk/openlayers@5913 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
518 lines
17 KiB
JavaScript
518 lines
17 KiB
JavaScript
/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
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* license. See http://svn.openlayers.org/trunk/openlayers/license.txt for the
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* full text of the license. */
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/**
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* @requires OpenLayers/Layer/Vector.js
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* @requires OpenLayers/Layer/Markers.js
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*/
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/**
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* Class: OpenLayers.Layer.WFS
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*
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* Inherits from:
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* - <OpenLayers.Layer.Vector>
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* - <OpenLayers.Layer.Markers>
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*/
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OpenLayers.Layer.WFS = OpenLayers.Class(
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OpenLayers.Layer.Vector, OpenLayers.Layer.Markers, {
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/**
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* APIProperty: isBaseLayer
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* {Boolean} WFS layer is not a base layer by default.
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*/
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isBaseLayer: false,
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/**
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* Property: tile
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* {<OpenLayers.Tile.WFS>}
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*/
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tile: null,
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/**
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* APIProperty: ratio
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* {Float} the ratio of image/tile size to map size (this is the untiled
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* buffer)
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*/
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ratio: 2,
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/**
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* Property: DEFAULT_PARAMS
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* {Object} Hashtable of default key/value parameters
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*/
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DEFAULT_PARAMS: { service: "WFS",
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version: "1.0.0",
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request: "GetFeature"
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},
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/**
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* APIProperty: featureClass
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* {<OpenLayers.Feature>} If featureClass is defined, an old-style markers
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* based WFS layer is created instead of a new-style vector layer. If
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* sent, this should be a subclass of OpenLayers.Feature
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*/
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featureClass: null,
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/**
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* APIProperty: format
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* {<OpenLayers.Format>} The format you want the data to be parsed with.
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* Must be passed in the constructor. Should be a class, not an instance.
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*/
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format: null,
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/**
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* Property: formatObject
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* {<OpenLayers.Format>} Internally created/managed format object, used by
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* the Tile to parse data.
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*/
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formatObject: null,
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/**
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* APIProperty: formatOptions
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* {Object} Hash of options which should be passed to the format when it is
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* created. Must be passed in the constructor.
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*/
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formatOptions: null,
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/**
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* Property: vectorMode
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* {Boolean} Should be calculated automatically.
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*/
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vectorMode: true,
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/**
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* APIProperty: encodeBBOX
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* {Boolean} Should the BBOX commas be encoded? The WMS spec says 'no',
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* but some services want it that way. Default false.
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*/
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encodeBBOX: false,
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/**
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* APIProperty: extractAttributes
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* {Boolean} Should the WFS layer parse attributes from the retrieved
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* GML? Defaults to false. If enabled, parsing is slower, but
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* attributes are available in the attributes property of
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* layer features.
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*/
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extractAttributes: false,
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/**
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* Constructor: OpenLayers.Layer.WFS
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*
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* Parameters:
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* name - {String}
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* url - {String}
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* params - {Object}
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* options - {Object} Hashtable of extra options to tag onto the layer
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*/
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initialize: function(name, url, params, options) {
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if (options == undefined) { options = {}; }
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if (options.featureClass ||
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!OpenLayers.Layer.Vector ||
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!OpenLayers.Feature.Vector) {
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this.vectorMode = false;
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}
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// Turn off error reporting, browsers like Safari may work
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// depending on the setup, and we don't want an unneccesary alert.
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OpenLayers.Util.extend(options, {'reportError': false});
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var newArguments = [];
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newArguments.push(name, options);
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OpenLayers.Layer.Vector.prototype.initialize.apply(this, newArguments);
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if (!this.renderer || !this.vectorMode) {
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this.vectorMode = false;
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if (!options.featureClass) {
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options.featureClass = OpenLayers.Feature.WFS;
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}
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OpenLayers.Layer.Markers.prototype.initialize.apply(this,
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newArguments);
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}
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if (this.params && this.params.typename && !this.options.typename) {
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this.options.typename = this.params.typename;
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}
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if (!this.options.geometry_column) {
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this.options.geometry_column = "the_geom";
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}
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this.params = params;
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OpenLayers.Util.applyDefaults(
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this.params,
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OpenLayers.Util.upperCaseObject(this.DEFAULT_PARAMS)
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);
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this.url = url;
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},
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/**
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* APIMethod: destroy
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*/
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destroy: function() {
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if (this.vectorMode) {
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OpenLayers.Layer.Vector.prototype.destroy.apply(this, arguments);
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} else {
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OpenLayers.Layer.Markers.prototype.destroy.apply(this, arguments);
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}
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},
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/**
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* Method: setMap
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*
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* Parameters:
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* map - {<OpenLayers.Map>}
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*/
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setMap: function(map) {
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if (this.vectorMode) {
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OpenLayers.Layer.Vector.prototype.setMap.apply(this, arguments);
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var options = {
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'extractAttributes': this.extractAttributes
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};
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OpenLayers.Util.extend(options, this.formatOptions);
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if (this.map && !this.projection.equals(this.map.getProjectionObject())) {
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options.externalProjection = this.projection;
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options.internalProjection = this.map.getProjectionObject();
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}
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this.formatObject = this.format ? new this.format(options) : new OpenLayers.Format.GML(options);
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} else {
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OpenLayers.Layer.Markers.prototype.setMap.apply(this, arguments);
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}
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},
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/**
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* Method: moveTo
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*
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* Parameters:
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* bounds - {<OpenLayers.Bounds>}
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* zoomChanged - {Boolean}
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* dragging - {Boolean}
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*/
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moveTo:function(bounds, zoomChanged, dragging) {
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if (this.vectorMode) {
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OpenLayers.Layer.Vector.prototype.moveTo.apply(this, arguments);
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} else {
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OpenLayers.Layer.Markers.prototype.moveTo.apply(this, arguments);
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}
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// don't load wfs features while dragging, wait for drag end
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if (dragging) {
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// TBD try to hide the vector layer while dragging
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// this.setVisibility(false);
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// this will probably help for panning performances
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return false;
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}
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if ( zoomChanged ) {
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if (this.vectorMode) {
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this.renderer.clear();
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}
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}
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//DEPRECATED - REMOVE IN 3.0
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// don't load data if current zoom level doesn't match
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if (this.options.minZoomLevel) {
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var err = "The minZoomLevel property is only intended for use " +
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"with the FixedZoomLevels-descendent layers. That this " +
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"wfs layer checks for minZoomLevel is a relic of the" +
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"past. We cannot, however, remove it without possibly " +
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"breaking OL based applications that may depend on it." +
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" Therefore we are deprecating it -- the minZoomLevel " +
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"check below will be removed at 3.0. Please instead " +
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"use min/max resolution setting as described here: " +
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"http://trac.openlayers.org/wiki/SettingZoomLevels";
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OpenLayers.Console.warn(err);
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if (this.map.getZoom() < this.options.minZoomLevel) {
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return null;
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}
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}
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if (bounds == null) {
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bounds = this.map.getExtent();
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}
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var firstRendering = (this.tile == null);
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//does the new bounds to which we need to move fall outside of the
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// current tile's bounds?
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var outOfBounds = (!firstRendering &&
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!this.tile.bounds.containsBounds(bounds));
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if (zoomChanged || firstRendering || (!dragging && outOfBounds)) {
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//determine new tile bounds
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var center = bounds.getCenterLonLat();
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var tileWidth = bounds.getWidth() * this.ratio;
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var tileHeight = bounds.getHeight() * this.ratio;
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var tileBounds =
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new OpenLayers.Bounds(center.lon - (tileWidth / 2),
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center.lat - (tileHeight / 2),
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center.lon + (tileWidth / 2),
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center.lat + (tileHeight / 2));
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//determine new tile size
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var tileSize = this.map.getSize();
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tileSize.w = tileSize.w * this.ratio;
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tileSize.h = tileSize.h * this.ratio;
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//determine new position (upper left corner of new bounds)
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var ul = new OpenLayers.LonLat(tileBounds.left, tileBounds.top);
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var pos = this.map.getLayerPxFromLonLat(ul);
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//formulate request url string
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var url = this.getFullRequestString();
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var params = {BBOX: this.encodeBBOX ? tileBounds.toBBOX()
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: tileBounds.toArray()};
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url += "&" + OpenLayers.Util.getParameterString(params);
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if (!this.tile) {
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this.tile = new OpenLayers.Tile.WFS(this, pos, tileBounds,
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url, tileSize);
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this.addTileMonitoringHooks(this.tile);
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this.tile.draw();
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} else {
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if (this.vectorMode) {
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this.destroyFeatures();
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this.renderer.clear();
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} else {
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this.clearMarkers();
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}
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this.removeTileMonitoringHooks(this.tile);
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this.tile.destroy();
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this.tile = null;
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this.tile = new OpenLayers.Tile.WFS(this, pos, tileBounds,
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url, tileSize);
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this.addTileMonitoringHooks(this.tile);
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this.tile.draw();
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}
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}
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},
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/**
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* Method: addTileMonitoringHooks
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* This function takes a tile as input and adds the appropriate hooks to
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* the tile so that the layer can keep track of the loading tile
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* (making sure to check that the tile is always the layer's current
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* tile before taking any action).
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*
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* Parameters:
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* tile - {<OpenLayers.Tile>}
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*/
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addTileMonitoringHooks: function(tile) {
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tile.onLoadStart = function() {
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//if this is the the layer's current tile, then trigger
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// a 'loadstart'
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if (this == this.layer.tile) {
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this.layer.events.triggerEvent("loadstart");
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}
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};
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tile.events.register("loadstart", tile, tile.onLoadStart);
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tile.onLoadEnd = function() {
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//if this is the the layer's current tile, then trigger
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// a 'tileloaded' and 'loadend'
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if (this == this.layer.tile) {
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this.layer.events.triggerEvent("tileloaded");
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this.layer.events.triggerEvent("loadend");
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}
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};
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tile.events.register("loadend", tile, tile.onLoadEnd);
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},
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/**
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* Method: removeTileMonitoringHooks
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* This function takes a tile as input and removes the tile hooks
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* that were added in addTileMonitoringHooks()
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*
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* Parameters:
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* tile - {<OpenLayers.Tile>}
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*/
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removeTileMonitoringHooks: function(tile) {
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tile.events.unregister("loadstart", tile, tile.onLoadStart);
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tile.events.unregister("loadend", tile, tile.onLoadEnd);
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},
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/**
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* Method: onMapResize
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* Call the onMapResize method of the appropriate parent class.
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*/
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onMapResize: function() {
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if(this.vectorMode) {
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OpenLayers.Layer.Vector.prototype.onMapResize.apply(this,
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arguments);
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} else {
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OpenLayers.Layer.Markers.prototype.onMapResize.apply(this,
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arguments);
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}
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},
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/**
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* APIMethod: mergeNewParams
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* Modify parameters for the layer and redraw.
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*
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* Parameters:
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* newParams - {Object}
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*/
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mergeNewParams:function(newParams) {
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var upperParams = OpenLayers.Util.upperCaseObject(newParams);
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var newArguments = [upperParams];
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OpenLayers.Layer.HTTPRequest.prototype.mergeNewParams.apply(this,
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newArguments);
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},
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/**
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* APIMethod: clone
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*
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* Parameters:
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* obj - {Object}
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*
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* Returns:
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* {<OpenLayers.Layer.WFS>} An exact clone of this OpenLayers.Layer.WFS
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*/
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clone: function (obj) {
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if (obj == null) {
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obj = new OpenLayers.Layer.WFS(this.name,
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this.url,
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this.params,
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this.options);
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}
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//get all additions from superclasses
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if (this.vectorMode) {
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obj = OpenLayers.Layer.Vector.prototype.clone.apply(this, [obj]);
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} else {
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obj = OpenLayers.Layer.Markers.prototype.clone.apply(this, [obj]);
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}
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// copy/set any non-init, non-simple values here
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return obj;
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},
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/**
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* APIMethod: getFullRequestString
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* combine the layer's url with its params and these newParams.
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*
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* Add the SRS parameter from 'projection' -- this is probably
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* more eloquently done via a setProjection() method, but this
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* works for now and always.
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*
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* Parameters:
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* newParams - {Object}
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* altUrl - {String} Use this as the url instead of the layer's url
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*/
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getFullRequestString:function(newParams, altUrl) {
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var projectionCode = this.map.getProjection();
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this.params.SRS = (projectionCode == "none") ? null : projectionCode;
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return OpenLayers.Layer.Grid.prototype.getFullRequestString.apply(
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this, arguments);
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},
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/**
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* APIMethod: commit
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* Write out the data to a WFS server.
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*/
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commit: function() {
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if (!this.writer) {
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this.writer = new OpenLayers.Format.WFS({},this);
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}
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var data = this.writer.write(this.features);
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var url = this.url;
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if (OpenLayers.ProxyHost &&
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OpenLayers.String.startsWith(this.url, "http")) {
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url = OpenLayers.ProxyHost + escape(this.url);
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}
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var success = OpenLayers.Function.bind(this.commitSuccess, this);
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var failure = OpenLayers.Function.bind(this.commitFailure, this);
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data = OpenLayers.Ajax.serializeXMLToString(data);
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// from prototype.js
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new OpenLayers.Ajax.Request(url,
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{ method: 'post',
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postBody: data,
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onComplete: success,
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onFailure: failure
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}
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);
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},
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/**
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* Method: commitSuccess
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* Called when the Ajax request returns a response
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*
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* Parameters:
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* response - {XmlNode} from server
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*/
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commitSuccess: function(request) {
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var response = request.responseText;
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if (response.indexOf('SUCCESS') != -1) {
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this.commitReport('WFS Transaction: SUCCESS', response);
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for(var i = 0; i < this.features.length; i++) {
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this.features[i].state = null;
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}
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// TBD redraw the layer or reset the state of features
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// foreach features: set state to null
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} else if (response.indexOf('FAILED') != -1 ||
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response.indexOf('Exception') != -1) {
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this.commitReport('WFS Transaction: FAILED', response);
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}
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},
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/**
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* Method: commitFailure
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* Called when the Ajax request fails
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*
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* Parameters:
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* response - {XmlNode} from server
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*/
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commitFailure: function(request) {},
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/**
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* APIMethod: commitReport
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* Called with a 'success' message if the commit succeeded, otherwise
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* a failure message, and the full request text as a second parameter.
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* Override this function to provide custom transaction reporting.
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*
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* string - {String} reporting string
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* response - {String} full XML response
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*/
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commitReport: function(string, response) {
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alert(string);
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},
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/**
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* APIMethod: refresh
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* Refreshes all the features of the layer
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*/
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refresh: function() {
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if (this.tile) {
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if (this.vectorMode) {
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this.renderer.clear();
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this.features.length = 0;
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} else {
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this.clearMarkers();
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this.markers.length = 0;
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}
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this.tile.draw();
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}
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},
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CLASS_NAME: "OpenLayers.Layer.WFS"
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});
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