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8
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1 define([ "./declare-style", "dojo/_base/declare", "ol", "implab/safe" ],
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2
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3 function(declare, dojoDeclare, ol, safe) {
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4 return declare([], {
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5 _cache : null,
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6 _getKey : null,
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7 _getZoom : null,
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8
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9 defaultStyle : null,
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10
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11 style : null,
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12
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13 styleFunction : null,
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14
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15 filter : null,
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16
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17 constructor : function(opts) {
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18 if (opts)
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19 dojoDeclare.safeMixin(this, opts);
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20
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21 this._cache = {};
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22
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23 if (this.zoom) {
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24 if (this.zoom instanceof Function) {
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25 this._getZoom = this.zoom;
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26 } else {
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27 var levels = [], max = "max";
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28 for ( var p in this.zoom) {
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29 if (safe.isNumber(this.zoom[p]))
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30 levels.push({
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31 name : p,
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32 zoom : Number(this.zoom[p])
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33 });
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34 else if (this.zoom[p] == "max")
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35 max = p;
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36 }
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37
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38 levels.sort(function(x, y) {
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39 return x.zoom - y.zoom;
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40 });
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41
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42 this.zoomMax = max;
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43 this.zoomLevels = levels;
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44
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45 this._getZoom = function(z) {
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46 for (var i = 0; i < levels.length; i++) {
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47 if (z <= levels[i].zoom)
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48 return levels[i].name;
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49 }
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50 return max;
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51 };
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52 }
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53 } else {
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54 this._getZoom = function(z) {
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55 return "max";
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56 };
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57 }
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58
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59 if (this.key) {
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60 if (this.key instanceof Function) {
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61 this._getKey = this.key;
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62 } else if (typeof this.key === "string") {
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63 this._getKey = function(ft) {
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64 return ft.get(this.key);
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65 };
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66 } else {
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67 this._getKey = function(ft, z) {
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68 var k = this.key[z];
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69 if (k instanceof Function)
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70 return k.call(this, ft, z);
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71 else if (typeof k == "string")
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72 return ft.get(k);
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73 else
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74 return this.defaultStyle;
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75 };
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76 }
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77 } else {
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78 this._getKey = function() {
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79 return this.defaultStyle;
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80 };
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81 }
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82
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83 if (this.style) {
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84 if (this.style instanceof Function) {
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85 this._style = this.style;
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86 } else {
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87 this._style = function(ft, res, key, zoom) {
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88 var s = this.style[zoom];
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89 return s && (s instanceof Function) ? s.apply(
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90 this,
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91 arguments) : s;
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92 };
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93 }
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94 }
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95 },
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96
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97 getFeatureStyle : function(ft, res) {
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98 safe.argumentNotNull(ft, "ft");
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99
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100 if (this.filter && this.filter(ft) === false)
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101 return null;
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102
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103 var z = this._getZoom(res);
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104 var k = this._getKey(ft, z);
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105
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106 var cid = [ k, z ].join('-');
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107
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108 var style = this._cache[cid];
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109 if (!style) {
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110 style = this._style ? this._style(ft, res, k, z) : null;
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111 this._cache[cid] = style;
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112 }
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113
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114
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115 return safe.isNull(style) || style instanceof Array ? style : [ style ];
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116 }
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117
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118 });
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119 }); |
