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[rails.git] / app / assets / javascripts / leaflet.customzoom.js
1 /*
2  * L.Control.CustomZoom is used for the default zoom buttons on the map.
3  */
4
5 L.Control.CustomZoom = L.Control.extend({
6         options: {
7                 position: 'topleft'
8         },
9
10         onAdd: function (map) {
11                 var zoomName = 'zoom',
12                     container = L.DomUtil.create('div', zoomName);
13
14                 this._map = map;
15
16                 this._zoomInButton  = this._createButton(
17                         '', 'Zoom in',  zoomName + 'in',  container, this._zoomIn,  this);
18                 this._zoomOutButton = this._createButton(
19                         '', 'Zoom out', zoomName + 'out', container, this._zoomOut, this);
20
21                 map.on('zoomend zoomlevelschange', this._updateDisabled, this);
22
23                 return container;
24         },
25
26         onRemove: function (map) {
27                 map.off('zoomend zoomlevelschange', this._updateDisabled, this);
28         },
29
30         _zoomIn: function (e) {
31                 this._map.zoomIn(e.shiftKey ? 3 : 1);
32         },
33
34         _zoomOut: function (e) {
35                 this._map.zoomOut(e.shiftKey ? 3 : 1);
36         },
37
38         _createButton: function (html, title, className, container, fn, context) {
39                 var link = L.DomUtil.create('a', 'control-button ' + className, container);
40                 link.innerHTML = html;
41                 link.href = '#';
42                 link.title = title;
43
44                 var sprite = L.DomUtil.create('span', 'icon ' + className, link);
45
46                 var stop = L.DomEvent.stopPropagation;
47
48                 L.DomEvent
49                     .on(link, 'click', stop)
50                     .on(link, 'mousedown', stop)
51                     .on(link, 'dblclick', stop)
52                     .on(link, 'click', L.DomEvent.preventDefault)
53                     .on(link, 'click', fn, context);
54
55                 return link;
56         },
57
58         _updateDisabled: function () {
59                 var map = this._map,
60                         className = 'leaflet-disabled';
61
62                 L.DomUtil.removeClass(this._zoomInButton, className);
63                 L.DomUtil.removeClass(this._zoomOutButton, className);
64
65                 if (map._zoom === map.getMinZoom()) {
66                         L.DomUtil.addClass(this._zoomOutButton, className);
67                 }
68                 if (map._zoom === map.getMaxZoom()) {
69                         L.DomUtil.addClass(this._zoomInButton, className);
70                 }
71         }
72 });
73
74 L.control.customZoom = function (options) {
75         return new L.Control.CustomZoom(options);
76 };