More PHP 5.4 fixes
[busui.git] / labs / openlayers / lib / OpenLayers / Icon.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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/* 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. */
 
/**
 * Class: OpenLayers.Icon
 * 
 * The icon represents a graphical icon on the screen.  Typically used in
 * conjunction with a <OpenLayers.Marker> to represent markers on a screen.
 *
 * An icon has a url, size and position.  It also contains an offset which 
 * allows the center point to be represented correctly.  This can be
 * provided either as a fixed offset or a function provided to calculate
 * the desired offset. 
 * 
 */
OpenLayers.Icon = OpenLayers.Class({
    
    /** 
     * Property: url 
     * {String}  image url
     */
    url: null,
    
    /** 
     * Property: size 
     * {<OpenLayers.Size>} 
     */
    size: null,
 
    /** 
     * Property: offset 
     * {<OpenLayers.Pixel>} distance in pixels to offset the image when being rendered
     */
    offset: null,    
    
    /** 
     * Property: calculateOffset 
     * {<OpenLayers.Pixel>} Function to calculate the offset (based on the size) 
     */
    calculateOffset: null,    
    
    /** 
     * Property: imageDiv 
     * {DOMElement} 
     */
    imageDiv: null,
 
    /** 
     * Property: px 
     * {<OpenLayers.Pixel>} 
     */
    px: null,
    
    /** 
     * Constructor: OpenLayers.Icon
     * Creates an icon, which is an image tag in a div.  
     *
     * url - {String} 
     * size - {<OpenLayers.Size>} 
     * offset - {<OpenLayers.Pixel>}
     * calculateOffset - {Function} 
     */
    initialize: function(url, size, offset, calculateOffset) {
        this.url = url;
        this.size = (size) ? size : new OpenLayers.Size(20,20);
        this.offset = offset ? offset : new OpenLayers.Pixel(-(this.size.w/2), -(this.size.h/2));
        this.calculateOffset = calculateOffset;
 
        var id = OpenLayers.Util.createUniqueID("OL_Icon_");
        this.imageDiv = OpenLayers.Util.createAlphaImageDiv(id);
    },
    
    /** 
     * Method: destroy
     * Nullify references and remove event listeners to prevent circular 
     * references and memory leaks
     */
    destroy: function() {
        // erase any drawn elements
        this.erase();
 
        OpenLayers.Event.stopObservingElement(this.imageDiv.firstChild); 
        this.imageDiv.innerHTML = "";
        this.imageDiv = null;
    },
 
    /** 
     * Method: clone
     * 
     * Returns:
     * {<OpenLayers.Icon>} A fresh copy of the icon.
     */
    clone: function() {
        return new OpenLayers.Icon(this.url, 
                                   this.size, 
                                   this.offset, 
                                   this.calculateOffset);
    },
    
    /**
     * Method: setSize
     * 
     * Parameters:
     * size - {<OpenLayers.Size>} 
     */
    setSize: function(size) {
        if (size != null) {
            this.size = size;
        }
        this.draw();
    },
    
    /**
     * Method: setUrl
     * 
     * Parameters:
     * url - {String} 
     */
    setUrl: function(url) {
        if (url != null) {
            this.url = url;
        }
        this.draw();
    },
 
    /** 
     * Method: draw
     * Move the div to the given pixel.
     * 
     * Parameters:
     * px - {<OpenLayers.Pixel>} 
     * 
     * Returns:
     * {DOMElement} A new DOM Image of this icon set at the location passed-in
     */
    draw: function(px) {
        OpenLayers.Util.modifyAlphaImageDiv(this.imageDiv, 
                                            null, 
                                            null, 
                                            this.size, 
                                            this.url, 
                                            "absolute");
        this.moveTo(px);
        return this.imageDiv;
    }, 
 
    /** 
     * Method: erase
     * Erase the underlying image element.
     *
     */
    erase: function() {
        if (this.imageDiv != null && this.imageDiv.parentNode != null) {
            OpenLayers.Element.remove(this.imageDiv);
        }
    }, 
    
    /** 
     * Method: setOpacity
     * Change the icon's opacity
     *
     * Parameters:
     * opacity - {float} 
     */
    setOpacity: function(opacity) {
        OpenLayers.Util.modifyAlphaImageDiv(this.imageDiv, null, null, null, 
                                            null, null, null, null, opacity);
 
    },
    
    /**
     * Method: moveTo
     * move icon to passed in px.
     *
     * Parameters:
     * px - {<OpenLayers.Pixel>} 
     */
    moveTo: function (px) {
        //if no px passed in, use stored location
        if (px != null) {
            this.px = px;
        }
 
        if (this.imageDiv != null) {
            if (this.px == null) {
                this.display(false);
            } else {
                if (this.calculateOffset) {
                    this.offset = this.calculateOffset(this.size);  
                }
                var offsetPx = this.px.offset(this.offset);
                OpenLayers.Util.modifyAlphaImageDiv(this.imageDiv, null, offsetPx);
            }
        }
    },
    
    /** 
     * Method: display
     * Hide or show the icon
     *
     * Parameters:
     * display - {Boolean} 
     */
    display: function(display) {
        this.imageDiv.style.display = (display) ? "" : "none"; 
    },
    
 
    /**
     * APIMethod: isDrawn
     * 
     * Returns:
     * {Boolean} Whether or not the icon is drawn.
     */
    isDrawn: function() {
        // nodeType 11 for ie, whose nodes *always* have a parentNode
        // (of type document fragment)
        var isDrawn = (this.imageDiv && this.imageDiv.parentNode && 
                       (this.imageDiv.parentNode.nodeType != 11));    
 
        return isDrawn;   
    },
 
    CLASS_NAME: "OpenLayers.Icon"
});