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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/Button.js
*/
/**
* Class: OpenLayers.Control.Pan
* The Pan control is a single button to pan the map in one direction. For
* a more complete control see <OpenLayers.Control.PanPanel>.
*
* Inherits from:
* - <OpenLayers.Control>
*/
OpenLayers.Control.Pan = OpenLayers.Class(OpenLayers.Control.Button, {
/**
* APIProperty: slideFactor
* {Integer} Number of pixels by which we'll pan the map in any direction
* on clicking the arrow buttons, defaults to 50. If you want to pan
* by some ratio of the map dimensions, use <slideRatio> instead.
*/
slideFactor: 50,
/**
* APIProperty: slideRatio
* {Number} The fraction of map width/height by which we'll pan the map
* on clicking the arrow buttons. Default is null. If set, will
* override <slideFactor>. E.g. if slideRatio is .5, then Pan Up will
* pan up half the map height.
*/
slideRatio: null,
/**
* Property: direction
* {String} in {'North', 'South', 'East', 'West'}
*/
direction: null,
/**
* Constructor: OpenLayers.Control.Pan
* Control which handles the panning (in any of the cardinal directions)
* of the map by a set px distance.
*
* Parameters:
* direction - {String} The direction this button should pan.
* options - {Object} An optional object whose properties will be used
* to extend the control.
*/
initialize: function(direction, options) {
this.direction = direction;
this.CLASS_NAME += this.direction;
OpenLayers.Control.prototype.initialize.apply(this, [options]);
},
/**
* Method: trigger
*/
trigger: function(){
if (this.map) {
var getSlideFactor = OpenLayers.Function.bind(function (dim) {
return this.slideRatio ?
this.map.getSize()[dim] * this.slideRatio :
this.slideFactor;
}, this);
switch (this.direction) {
case OpenLayers.Control.Pan.NORTH:
this.map.pan(0, -getSlideFactor("h"));
break;
case OpenLayers.Control.Pan.SOUTH:
this.map.pan(0, getSlideFactor("h"));
break;
case OpenLayers.Control.Pan.WEST:
this.map.pan(-getSlideFactor("w"), 0);
break;
case OpenLayers.Control.Pan.EAST:
this.map.pan(getSlideFactor("w"), 0);
break;
}
}
},
CLASS_NAME: "OpenLayers.Control.Pan"
});
OpenLayers.Control.Pan.NORTH = "North";
OpenLayers.Control.Pan.SOUTH = "South";
OpenLayers.Control.Pan.EAST = "East";
OpenLayers.Control.Pan.WEST = "West";
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