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);
}
};
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