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from monotone. problematic https vs v2 API
author Matt Johnston <matt@ucc.asn.au>
date Sun, 21 Oct 2012 23:03:51 +0800
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1 /*
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2 * LabeledMarker Class
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3 *
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4 * Copyright 2007 Mike Purvis (http://uwmike.com)
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5 *
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6 * Licensed under the Apache License, Version 2.0 (the "License");
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7 * you may not use this file except in compliance with the License.
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8 * You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 *
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18 * This class extends the Maps API's standard GMarker class with the ability
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19 * to support markers with textual labels. Please see articles here:
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20 *
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21 * http://googlemapsbook.com/2007/01/22/extending-gmarker/
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22 * http://googlemapsbook.com/2007/03/06/clickable-labeledmarker/
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23 */
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24
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25 /* Constructor */
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26 function LabeledMarker(latlng, options){
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27 this.latlng = latlng;
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28 this.labelText = options.labelText || "";
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29 this.labelClass = options.labelClass || "markerLabel";
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30 this.labelOffset = options.labelOffset || new GSize(0, 0);
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31
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32 this.clickable = options.clickable || true;
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33
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34 if (options.draggable) {
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35 // This version of LabeledMarker doesn't support dragging.
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36 options.draggable = false;
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37 }
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38
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39 GMarker.apply(this, arguments);
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40 }
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41
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42
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43 /* It's a limitation of JavaScript inheritance that we can't conveniently
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44 extend GMarker without having to run its constructor. In order for the
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45 constructor to run, it requires some dummy GLatLng. */
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46 LabeledMarker.prototype = new GMarker(new GLatLng(0, 0));
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47
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48
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49 // Creates the text div that goes over the marker.
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50 LabeledMarker.prototype.initialize = function(map) {
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51 // Do the GMarker constructor first.
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52 GMarker.prototype.initialize.apply(this, arguments);
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53
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54 var div = document.createElement("div");
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55 div.className = this.labelClass;
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56 div.innerHTML = this.labelText;
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57 div.style.position = "absolute";
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58 map.getPane(G_MAP_MARKER_PANE).appendChild(div);
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59
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60 if (this.clickable) {
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61 // Pass through events fired on the text div to the marker.
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62 var eventPassthrus = ['click', 'dblclick', 'mousedown', 'mouseup', 'mouseover', 'mouseout'];
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63 for(var i = 0; i < eventPassthrus.length; i++) {
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64 var name = eventPassthrus[i];
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65 GEvent.addDomListener(div, name, newEventPassthru(this, name));
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66 }
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67
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68 // Mouseover behaviour for the cursor.
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69 div.style.cursor = "pointer";
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70 }
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71
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72 this.map = map;
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73 this.div = div;
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74 }
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75
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76 function newEventPassthru(obj, event) {
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77 return function() {
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78 GEvent.trigger(obj, event);
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79 };
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80 }
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81
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82 // Redraw the rectangle based on the current projection and zoom level
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83 LabeledMarker.prototype.redraw = function(force) {
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84 GMarker.prototype.redraw.apply(this, arguments);
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85
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86 // We only need to do anything if the coordinate system has changed
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87 if (!force) return;
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88
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89 // Calculate the DIV coordinates of two opposite corners of our bounds to
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90 // get the size and position of our rectangle
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91 var p = this.map.fromLatLngToDivPixel(this.latlng);
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92 var z = GOverlay.getZIndex(this.latlng.lat());
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93
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94 // Now position our DIV based on the DIV coordinates of our bounds
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95 this.div.style.left = (p.x + this.labelOffset.width) + "px";
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96 this.div.style.top = (p.y + this.labelOffset.height) + "px";
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97 this.div.style.zIndex = z + 1; // in front of the marker
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98 }
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99
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100 // Remove the main DIV from the map pane, destroy event handlers
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101 LabeledMarker.prototype.remove = function() {
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102 GEvent.clearInstanceListeners(this.div);
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103 this.div.parentNode.removeChild(this.div);
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104 this.div = null;
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105 GMarker.prototype.remove.apply(this, arguments);
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106 }