openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
122 lines (101 loc) • 3.51 kB
JavaScript
goog.provide('ol.control.Zoom');
goog.require('ol');
goog.require('ol.events');
goog.require('ol.events.EventType');
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 !== undefined ? options.className : 'ol-zoom';
var delta = options.delta !== undefined ? options.delta : 1;
var zoomInLabel = options.zoomInLabel !== undefined ? options.zoomInLabel : '+';
var zoomOutLabel = options.zoomOutLabel !== undefined ? options.zoomOutLabel : '\u2212';
var zoomInTipLabel = options.zoomInTipLabel !== undefined ?
options.zoomInTipLabel : 'Zoom in';
var zoomOutTipLabel = options.zoomOutTipLabel !== undefined ?
options.zoomOutTipLabel : 'Zoom out';
var inElement = document.createElement('button');
inElement.className = className + '-in';
inElement.setAttribute('type', 'button');
inElement.title = zoomInTipLabel;
inElement.appendChild(
typeof zoomInLabel === 'string' ? document.createTextNode(zoomInLabel) : zoomInLabel
);
ol.events.listen(inElement, ol.events.EventType.CLICK,
ol.control.Zoom.prototype.handleClick_.bind(this, delta));
var outElement = document.createElement('button');
outElement.className = className + '-out';
outElement.setAttribute('type', 'button');
outElement.title = zoomOutTipLabel;
outElement.appendChild(
typeof zoomOutLabel === 'string' ? document.createTextNode(zoomOutLabel) : zoomOutLabel
);
ol.events.listen(outElement, ol.events.EventType.CLICK,
ol.control.Zoom.prototype.handleClick_.bind(this, -delta));
var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
ol.css.CLASS_CONTROL;
var element = document.createElement('div');
element.className = cssClasses;
element.appendChild(inElement);
element.appendChild(outElement);
ol.control.Control.call(this, {
element: element,
target: options.target
});
/**
* @type {number}
* @private
*/
this.duration_ = options.duration !== undefined ? options.duration : 250;
};
ol.inherits(ol.control.Zoom, ol.control.Control);
/**
* @param {number} delta Zoom delta.
* @param {Event} 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) {
var newResolution = view.constrainResolution(currentResolution, delta);
if (this.duration_ > 0) {
if (view.getAnimating()) {
view.cancelAnimations();
}
view.animate({
resolution: newResolution,
duration: this.duration_,
easing: ol.easing.easeOut
});
} else {
view.setResolution(newResolution);
}
}
};