Add overview myway timeliness table
[busui.git] / labs / openlayers / lib / OpenLayers / Control / ArgParser.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for 
 * full list of contributors). Published under the Clear BSD license.  
 * See http://svn.openlayers.org/trunk/openlayers/license.txt for the
 * full text of the license. */
 
 
/**
 * @requires OpenLayers/Control.js
 */
 
/**
 * Class: OpenLayers.Control.ArgParser
 * The ArgParser control adds location bar querystring parsing functionality 
 * to an OpenLayers Map.
 * When added to a Map control, on a page load/refresh, the Map will 
 * automatically take the href string and parse it for lon, lat, zoom, and 
 * layers information. 
 *
 * Inherits from:
 *  - <OpenLayers.Control>
 */
OpenLayers.Control.ArgParser = OpenLayers.Class(OpenLayers.Control, {
 
    /**
     * Parameter: center
     * {<OpenLayers.LonLat>}
     */
    center: null,
    
    /**
     * Parameter: zoom
     * {int}
     */
    zoom: null,
 
    /**
     * Parameter: layers 
     * {Array(<OpenLayers.Layer>)}
     */
    layers: null,
    
    /** 
     * APIProperty: displayProjection
     * {<OpenLayers.Projection>} Requires proj4js support. 
     *     Projection used when reading the coordinates from the URL. This will
     *
     *     reproject the map coordinates from the URL into the map's
     *     projection.
     *
     *     If you are using this functionality, be aware that any permalink
     *     which is added to the map will determine the coordinate type which
     *     is read from the URL, which means you should not add permalinks with
     *     different displayProjections to the same map. 
     */
    displayProjection: null, 
 
    /**
     * Constructor: OpenLayers.Control.ArgParser
     *
     * Parameters:
     * options - {Object}
     */
    initialize: function(options) {
        OpenLayers.Control.prototype.initialize.apply(this, arguments);
    },
 
    /**
     * Method: setMap
     * Set the map property for the control. 
     * 
     * Parameters:
     * map - {<OpenLayers.Map>} 
     */
    setMap: function(map) {
        OpenLayers.Control.prototype.setMap.apply(this, arguments);
 
        //make sure we dont already have an arg parser attached
        for(var i=0, len=this.map.controls.length; i<len; i++) {
            var control = this.map.controls[i];
            if ( (control != this) &&
                 (control.CLASS_NAME == "OpenLayers.Control.ArgParser") ) {
                
                // If a second argparser is added to the map, then we 
                // override the displayProjection to be the one added to the
                // map. 
                if (control.displayProjection != this.displayProjection) {
                    this.displayProjection = control.displayProjection;
                }    
                
                break;
            }
        }
        if (i == this.map.controls.length) {
 
            var args = OpenLayers.Util.getParameters();
            // Be careful to set layer first, to not trigger unnecessary layer loads
            if (args.layers) {
                this.layers = args.layers;
    
                // when we add a new layer, set its visibility 
                this.map.events.register('addlayer', this, 
                                         this.configureLayers);
                this.configureLayers();
            }
            if (args.lat && args.lon) {
                this.center = new OpenLayers.LonLat(parseFloat(args.lon),
                                                    parseFloat(args.lat));
                if (args.zoom) {
                    this.zoom = parseInt(args.zoom);
                }
    
                // when we add a new baselayer to see when we can set the center
                this.map.events.register('changebaselayer', this, 
                                         this.setCenter);
                this.setCenter();
            }
        }
    },
   
    /** 
     * Method: setCenter
     * As soon as a baseLayer has been loaded, we center and zoom
     *   ...and remove the handler.
     */
    setCenter: function() {
        
        if (this.map.baseLayer) {
            //dont need to listen for this one anymore
            this.map.events.unregister('changebaselayer', this, 
                                       this.setCenter);
            
            if (this.displayProjection) {
                this.center.transform(this.displayProjection, 
                                      this.map.getProjectionObject()); 
            }      
 
            this.map.setCenter(this.center, this.zoom);
        }
    },
 
    /** 
     * Method: configureLayers
     * As soon as all the layers are loaded, cycle through them and 
     *   hide or show them. 
     */
    configureLayers: function() {
 
        if (this.layers.length == this.map.layers.length) { 
            this.map.events.unregister('addlayer', this, this.configureLayers);
 
            for(var i=0, len=this.layers.length; i<len; i++) {
                
                var layer = this.map.layers[i];
                var c = this.layers.charAt(i);
                
                if (c == "B") {
                    this.map.setBaseLayer(layer);
                } else if ( (c == "T") || (c == "F") ) {
                    layer.setVisibility(c == "T");
                }
            }
        }
    },     
 
    CLASS_NAME: "OpenLayers.Control.ArgParser"
});