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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
*/
/**
* Class: OpenLayers.Strategy
* Abstract vector layer strategy class. Not to be instantiated directly. Use
* one of the strategy subclasses instead.
*/
OpenLayers.Strategy = OpenLayers.Class({
/**
* Property: layer
* {<OpenLayers.Layer.Vector>} The layer this strategy belongs to.
*/
layer: null,
/**
* Property: options
* {Object} Any options sent to the constructor.
*/
options: null,
/**
* Property: active
* {Boolean} The control is active.
*/
active: null,
/**
* Property: autoActivate
* {Boolean} The creator of the strategy can set autoActivate to false
* to fully control when the protocol is activated and deactivated.
* Defaults to true.
*/
autoActivate: true,
/**
* Property: autoDestroy
* {Boolean} The creator of the strategy can set autoDestroy to false
* to fully control when the strategy is destroyed. Defaults to
* true.
*/
autoDestroy: true,
/**
* Constructor: OpenLayers.Strategy
* Abstract class for vector strategies. Create instances of a subclass.
*
* Parameters:
* options - {Object} Optional object whose properties will be set on the
* instance.
*/
initialize: function(options) {
OpenLayers.Util.extend(this, options);
this.options = options;
// set the active property here, so that user cannot override it
this.active = false;
},
/**
* APIMethod: destroy
* Clean up the strategy.
*/
destroy: function() {
this.deactivate();
this.layer = null;
this.options = null;
},
/**
* Method: setLayer
* Called to set the <layer> property.
*
* Parameters:
* layer - {<OpenLayers.Layer.Vector>}
*/
setLayer: function(layer) {
this.layer = layer;
},
/**
* Method: activate
* Activate the strategy. Register any listeners, do appropriate setup.
*
* Returns:
* {Boolean} True if the strategy was successfully activated or false if
* the strategy was already active.
*/
activate: function() {
if (!this.active) {
this.active = true;
return true;
}
return false;
},
/**
* Method: deactivate
* Deactivate the strategy. Unregister any listeners, do appropriate
* tear-down.
*
* Returns:
* {Boolean} True if the strategy was successfully deactivated or false if
* the strategy was already inactive.
*/
deactivate: function() {
if (this.active) {
this.active = false;
return true;
}
return false;
},
CLASS_NAME: "OpenLayers.Strategy"
});