all files / ol/control/ zoomcontrol.js

69.23% Statements 27/39
36.36% Branches 8/22
33.33% Functions 1/3
69.23% Lines 27/39
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goog.provide('ol.control.Zoom');
 
goog.require('goog.dom');
goog.require('goog.events');
goog.require('goog.events.EventType');
goog.require('ol.animation');
goog.require('ol.control.Control');
goog.require('ol.css');
goog.require('ol.easing');
 
 
 
/**
 * @classdesc
 * A control with 2 buttons, one for zoom in and one for zoom out.
 * This control is one of the default controls of a map. To style this control
 * use css selectors `.ol-zoom-in` and `.ol-zoom-out`.
 *
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.ZoomOptions=} opt_options Zoom options.
 * @api stable
 */
ol.control.Zoom = function(opt_options) {
 
  var options = opt_options ? opt_options : {};
 
  var className = options.className ? options.className : 'ol-zoom';
 
  var delta = options.delta ? options.delta : 1;
 
  var zoomInLabel = options.zoomInLabel ? options.zoomInLabel : '+';
  var zoomOutLabel = options.zoomOutLabel ? options.zoomOutLabel : '\u2212';
 
  var zoomInTipLabel = options.zoomInTipLabel ?
      options.zoomInTipLabel : 'Zoom in';
  var zoomOutTipLabel = options.zoomOutTipLabel ?
      options.zoomOutTipLabel : 'Zoom out';
 
  var inElement = goog.dom.createDom('BUTTON', {
    'class': className + '-in',
    'type' : 'button',
    'title': zoomInTipLabel
  }, zoomInLabel);
 
  goog.events.listen(inElement,
      goog.events.EventType.CLICK, goog.partial(
          ol.control.Zoom.prototype.handleClick_, delta), false, this);
 
  var outElement = goog.dom.createDom('BUTTON', {
    'class': className + '-out',
    'type' : 'button',
    'title': zoomOutTipLabel
  }, zoomOutLabel);
 
  goog.events.listen(outElement,
      goog.events.EventType.CLICK, goog.partial(
          ol.control.Zoom.prototype.handleClick_, -delta), false, this);
 
  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
      ol.css.CLASS_CONTROL;
  var element = goog.dom.createDom('DIV', cssClasses, inElement,
      outElement);
 
  goog.base(this, {
    element: element,
    target: options.target
  });
 
  /**
   * @type {number}
   * @private
   */
  this.duration_ = options.duration !== undefined ? options.duration : 250;
 
};
goog.inherits(ol.control.Zoom, ol.control.Control);
 
 
/**
 * @param {number} delta Zoom delta.
 * @param {goog.events.BrowserEvent} event The event to handle
 * @private
 */
ol.control.Zoom.prototype.handleClick_ = function(delta, event) {
  event.preventDefault();
  this.zoomByDelta_(delta);
};
 
 
/**
 * @param {number} delta Zoom delta.
 * @private
 */
ol.control.Zoom.prototype.zoomByDelta_ = function(delta) {
  var map = this.getMap();
  var view = map.getView();
  if (!view) {
    // the map does not have a view, so we can't act
    // upon it
    return;
  }
  var currentResolution = view.getResolution();
  if (currentResolution) {
    if (this.duration_ > 0) {
      map.beforeRender(ol.animation.zoom({
        resolution: currentResolution,
        duration: this.duration_,
        easing: ol.easing.easeOut
      }));
    }
    var newResolution = view.constrainResolution(currentResolution, delta);
    view.setResolution(newResolution);
  }
};