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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/BaseTypes/Class.js
* @requires OpenLayers/Style.js
* @requires OpenLayers/Feature/Vector.js
*/
/**
* Class: OpenLayers.StyleMap
*/
OpenLayers.StyleMap = OpenLayers.Class({
/**
* Property: styles
* {Object} Hash of {<OpenLayers.Style>}, keyed by names of well known
* rendering intents (e.g. "default", "temporary", "select", "delete").
*/
styles: null,
/**
* Property: extendDefault
* {Boolean} if true, every render intent will extend the symbolizers
* specified for the "default" intent at rendering time. Otherwise, every
* rendering intent will be treated as a completely independent style.
*/
extendDefault: true,
/**
* Constructor: OpenLayers.StyleMap
*
* Parameters:
* style - {Object} Optional. Either a style hash, or a style object, or
* a hash of style objects (style hashes) keyed by rendering
* intent. If just one style hash or style object is passed,
* this will be used for all known render intents (default,
* select, temporary)
* options - {Object} optional hash of additional options for this
* instance
*/
initialize: function (style, options) {
this.styles = {
"default": new OpenLayers.Style(
OpenLayers.Feature.Vector.style["default"]),
"select": new OpenLayers.Style(
OpenLayers.Feature.Vector.style["select"]),
"temporary": new OpenLayers.Style(
OpenLayers.Feature.Vector.style["temporary"]),
"delete": new OpenLayers.Style(
OpenLayers.Feature.Vector.style["delete"])
};
// take whatever the user passed as style parameter and convert it
// into parts of stylemap.
if(style instanceof OpenLayers.Style) {
// user passed a style object
this.styles["default"] = style;
this.styles["select"] = style;
this.styles["temporary"] = style;
this.styles["delete"] = style;
} else if(typeof style == "object") {
for(var key in style) {
if(style[key] instanceof OpenLayers.Style) {
// user passed a hash of style objects
this.styles[key] = style[key];
} else if(typeof style[key] == "object") {
// user passsed a hash of style hashes
this.styles[key] = new OpenLayers.Style(style[key]);
} else {
// user passed a style hash (i.e. symbolizer)
this.styles["default"] = new OpenLayers.Style(style);
this.styles["select"] = new OpenLayers.Style(style);
this.styles["temporary"] = new OpenLayers.Style(style);
this.styles["delete"] = new OpenLayers.Style(style);
break;
}
}
}
OpenLayers.Util.extend(this, options);
},
/**
* Method: destroy
*/
destroy: function() {
for(var key in this.styles) {
this.styles[key].destroy();
}
this.styles = null;
},
/**
* Method: createSymbolizer
* Creates the symbolizer for a feature for a render intent.
*
* Parameters:
* feature - {<OpenLayers.Feature>} The feature to evaluate the rules
* of the intended style against.
* intent - {String} The intent determines the symbolizer that will be
* used to draw the feature. Well known intents are "default"
* (for just drawing the features), "select" (for selected
* features) and "temporary" (for drawing features).
*
* Returns:
* {Object} symbolizer hash
*/
createSymbolizer: function(feature, intent) {
if(!feature) {
feature = new OpenLayers.Feature.Vector();
}
if(!this.styles[intent]) {
intent = "default";
}
feature.renderIntent = intent;
var defaultSymbolizer = {};
if(this.extendDefault && intent != "default") {
defaultSymbolizer = this.styles["default"].createSymbolizer(feature);
}
return OpenLayers.Util.extend(defaultSymbolizer,
this.styles[intent].createSymbolizer(feature));
},
/**
* Method: addUniqueValueRules
* Convenience method to create comparison rules for unique values of a
* property. The rules will be added to the style object for a specified
* rendering intent. This method is a shortcut for creating something like
* the "unique value legends" familiar from well known desktop GIS systems
*
* Parameters:
* renderIntent - {String} rendering intent to add the rules to
* property - {String} values of feature attributes to create the
* rules for
* symbolizers - {Object} Hash of symbolizers, keyed by the desired
* property values
* context - {Object} An optional object with properties that
* symbolizers' property values should be evaluated
* against. If no context is specified, feature.attributes
* will be used
*/
addUniqueValueRules: function(renderIntent, property, symbolizers, context) {
var rules = [];
for (var value in symbolizers) {
rules.push(new OpenLayers.Rule({
symbolizer: symbolizers[value],
context: context,
filter: new OpenLayers.Filter.Comparison({
type: OpenLayers.Filter.Comparison.EQUAL_TO,
property: property,
value: value
})
}));
}
this.styles[renderIntent].addRules(rules);
},
CLASS_NAME: "OpenLayers.StyleMap"
});