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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/Control.js
* @requires OpenLayers/Events/buttonclick.js
*/
/**
* Class: OpenLayers.Control.Zoom
* The Zoom control is a pair of +/- links for zooming in and out.
*
* Inherits from:
* - <OpenLayers.Control>
*/
OpenLayers.Control.Zoom = OpenLayers.Class(OpenLayers.Control, {
/**
* APIProperty: zoomInText
* {String}
* Text for zoom-in link. Default is "+".
*/
zoomInText: "+",
/**
* APIProperty: zoomInId
* {String}
* Instead of having the control create a zoom in link, you can provide
* the identifier for an anchor element already added to the document.
* By default, an element with id "olZoomInLink" will be searched for
* and used if it exists.
*/
zoomInId: "olZoomInLink",
/**
* APIProperty: zoomOutText
* {String}
* Text for zoom-out link. Default is "\u2212".
*/
zoomOutText: "\u2212",
/**
* APIProperty: zoomOutId
* {String}
* Instead of having the control create a zoom out link, you can provide
* the identifier for an anchor element already added to the document.
* By default, an element with id "olZoomOutLink" will be searched for
* and used if it exists.
*/
zoomOutId: "olZoomOutLink",
/**
* Method: draw
*
* Returns:
* {DOMElement} A reference to the DOMElement containing the zoom links.
*/
draw: function() {
var div = OpenLayers.Control.prototype.draw.apply(this),
links = this.getOrCreateLinks(div),
zoomIn = links.zoomIn,
zoomOut = links.zoomOut,
eventsInstance = this.map.events;
if (zoomOut.parentNode !== div) {
eventsInstance = this.events;
eventsInstance.attachToElement(zoomOut.parentNode);
}
eventsInstance.register("buttonclick", this, this.onZoomClick);
this.zoomInLink = zoomIn;
this.zoomOutLink = zoomOut;
return div;
},
/**
* Method: getOrCreateLinks
*
* Parameters:
* el - {DOMElement}
*
* Return:
* {Object} Object with zoomIn and zoomOut properties referencing links.
*/
getOrCreateLinks: function(el) {
var zoomIn = document.getElementById(this.zoomInId),
zoomOut = document.getElementById(this.zoomOutId);
if (!zoomIn) {
zoomIn = document.createElement("a");
zoomIn.href = "#zoomIn";
zoomIn.appendChild(document.createTextNode(this.zoomInText));
zoomIn.className = "olControlZoomIn";
el.appendChild(zoomIn);
}
OpenLayers.Element.addClass(zoomIn, "olButton");
if (!zoomOut) {
zoomOut = document.createElement("a");
zoomOut.href = "#zoomOut";
zoomOut.appendChild(document.createTextNode(this.zoomOutText));
zoomOut.className = "olControlZoomOut";
el.appendChild(zoomOut);
}
OpenLayers.Element.addClass(zoomOut, "olButton");
return {
zoomIn: zoomIn, zoomOut: zoomOut
};
},
/**
* Method: onZoomClick
* Called when zoomin/out link is clicked.
*/
onZoomClick: function(evt) {
var button = evt.buttonElement;
if (button === this.zoomInLink) {
this.map.zoomIn();
} else if (button === this.zoomOutLink) {
this.map.zoomOut();
}
},
/**
* Method: destroy
* Clean up.
*/
destroy: function() {
if (this.map) {
this.map.events.unregister("buttonclick", this, this.onZoomClick);
}
delete this.zoomInLink;
delete this.zoomOutLink;
OpenLayers.Control.prototype.destroy.apply(this);
},
CLASS_NAME: "OpenLayers.Control.Zoom"
});
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