8d6bddf0ac
The zoom control allows for zoom in/out links that can be styled with CSS.
Note: This change was originally captured in #269. It involves nice additions thanks @ahocevar. The changes were unintentionally merged and then reverted with fb3caf1561, so the history of commits is not immediately apparent (though still likely there somewhere due to the magic of git).
140 lines
4.1 KiB
JavaScript
140 lines
4.1 KiB
JavaScript
/* Copyright (c) 2006-2012 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the Clear BSD license.
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* 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/Control.js
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* @requires OpenLayers/Events/buttonclick.js
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*/
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/**
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* Class: OpenLayers.Control.Zoom
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* The Zoom control is a pair of +/- links for zooming in and out.
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*
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* Inherits from:
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* - <OpenLayers.Control>
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*/
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OpenLayers.Control.Zoom = OpenLayers.Class(OpenLayers.Control, {
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/**
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* APIProperty: zoomInText
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* {String}
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* Text for zoom-in link. Default is "+".
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*/
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zoomInText: "+",
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/**
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* APIProperty: zoomInId
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* {String}
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* Instead of having the control create a zoom in link, you can provide
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* the identifier for an anchor element already added to the document.
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* By default, an element with id "olZoomInLink" will be searched for
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* and used if it exists.
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*/
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zoomInId: "olZoomInLink",
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/**
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* APIProperty: zoomOutText
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* {String}
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* Text for zoom-out link. Default is "-".
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*/
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zoomOutText: "-",
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/**
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* APIProperty: zoomOutId
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* {String}
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* Instead of having the control create a zoom out link, you can provide
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* the identifier for an anchor element already added to the document.
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* By default, an element with id "olZoomOutLink" will be searched for
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* and used if it exists.
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*/
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zoomOutId: "olZoomOutLink",
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/**
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* Method: draw
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*
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* Returns:
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* {DOMElement} A reference to the DOMElement containing the zoom links.
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*/
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draw: function() {
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var div = OpenLayers.Control.prototype.draw.apply(this),
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links = this.getOrCreateLinks(div),
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zoomIn = links.zoomIn,
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zoomOut = links.zoomOut,
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bind = OpenLayers.Function.bind,
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eventsInstance = this.map.events;
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if (zoomOut.parentNode !== div) {
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eventsInstance = this.events;
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eventsInstance.attachToElement(zoomOut.parentNode);
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}
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eventsInstance.register("buttonclick", this, this.onZoomClick);
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this.zoomInLink = zoomIn;
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this.zoomOutLink = zoomOut;
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return div;
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},
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/**
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* Method: getOrCreateLinks
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*
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* Parameters:
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* el - {DOMElement}
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*
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* Return:
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* {Object} Object with zoomIn and zoomOut properties referencing links.
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*/
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getOrCreateLinks: function(el) {
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var zoomIn = document.getElementById(this.zoomInId),
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zoomOut = document.getElementById(this.zoomOutId);
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if (!zoomIn) {
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zoomIn = document.createElement("a");
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zoomIn.href = "#zoomIn";
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zoomIn.appendChild(document.createTextNode(this.zoomInText));
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zoomIn.className = "olControlZoomIn";
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el.appendChild(zoomIn);
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}
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OpenLayers.Element.addClass(zoomIn, "olButton");
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if (!zoomOut) {
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zoomOut = document.createElement("a");
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zoomOut.href = "#zoomOut";
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zoomOut.appendChild(document.createTextNode(this.zoomOutText));
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zoomOut.className = "olControlZoomOut";
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el.appendChild(zoomOut);
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}
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OpenLayers.Element.addClass(zoomOut, "olButton");
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return {
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zoomIn: zoomIn, zoomOut: zoomOut
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};
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},
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/**
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* Method: onZoomClick
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* Called when zoomin/out link is clicked.
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*/
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onZoomClick: function(evt) {
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var button = evt.buttonElement;
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if (button === this.zoomInLink) {
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this.map.zoomIn();
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} else if (button === this.zoomOutLink) {
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this.map.zoomOut();
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}
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},
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/**
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* Method: destroy
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* Clean up.
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*/
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destroy: function() {
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if (this.map) {
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this.map.events.unregister("buttonclick", this, this.onZoomClick);
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}
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delete this.zoomInLink;
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delete this.zoomOutLink;
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OpenLayers.Control.prototype.destroy.apply(this);
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},
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CLASS_NAME: "OpenLayers.Control.Zoom"
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});
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