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 | /* * LabeledMarker Class * * Copyright 2007 Mike Purvis (http://uwmike.com) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * This class extends the Maps API's standard GMarker class with the ability * to support markers with textual labels. Please see articles here: * * http://googlemapsbook.com/2007/01/22/extending-gmarker/ * http://googlemapsbook.com/2007/03/06/clickable-labeledmarker/ */ /** * Constructor for LabeledMarker, which picks up on strings from the GMarker * options array, and then calls the GMarker constructor. * * @param {GLatLng} latlng * @param {GMarkerOptions} Named optional arguments: * opt_opts.labelText {String} text to place in the overlay div. * opt_opts.labelClass {String} class to use for the overlay div. * (default "markerLabel") * opt_opts.labelOffset {GSize} label offset, the x- and y-distance between * the marker's latlng and the upper-left corner of the text div. */ function LabeledMarker(latlng, opt_opts){ this.latlng_ = latlng; this.opts_ = opt_opts; this.initText_ = opt_opts.labelText || ""; this.labelClass_ = opt_opts.labelClass || "markerLabel"; this.labelOffset_ = opt_opts.labelOffset || new GSize(0, 0); this.clickable_ = opt_opts.clickable || true; if (opt_opts.draggable) { // This version of LabeledMarker doesn't support dragging. opt_opts.draggable = false; } GMarker.apply(this, arguments); } // It's a limitation of JavaScript inheritance that we can't conveniently // inherit from GMarker without having to run its constructor. In order for // the constructor to run, it requires some dummy GLatLng. LabeledMarker.prototype = new GMarker(new GLatLng(0, 0)); /** * Is called by GMap2's addOverlay method. Creates the text div and adds it * to the relevant parent div. * * @param {GMap2} map the map that has had this labeledmarker added to it. */ LabeledMarker.prototype.initialize = function(map) { // Do the GMarker constructor first. GMarker.prototype.initialize.apply(this, arguments); this.map_ = map; this.setText(this.initText_); } /** * Create a new div for this label. */ LabeledMarker.prototype.makeDiv_ = function(map) { if (this.div_) { return; } this.div_ = document.createElement("div"); this.div_.className = this.labelClass_; this.div_.style.position = "absolute"; this.div_.style.cursor = "pointer"; this.map_.getPane(G_MAP_MARKER_PANE).appendChild(this.div_); if (this.clickable_) { /** * Creates a closure for passing events through to the source marker * This is located in here to avoid cluttering the global namespace. * The downside is that the local variables from initialize() continue * to occupy space on the stack. * * @param {Object} object to receive event trigger. * @param {GEventListener} event to be triggered. */ function newEventPassthru(obj, event) { return function() { GEvent.trigger(obj, event); }; } // Pass through events fired on the text div to the marker. var eventPassthrus = ['click', 'dblclick', 'mousedown', 'mouseup', 'mouseover', 'mouseout']; for(var i = 0; i < eventPassthrus.length; i++) { var name = eventPassthrus[i]; GEvent.addDomListener(this.div_, name, newEventPassthru(this, name)); } } } /** * Return the html in the div of this label, or "" if none is set */ LabeledMarker.prototype.getText = function(text) { if (this.div_) { return this.div_.innerHTML; } else { return ""; } } /** * Set the html in the div of this label to text. If text is "" or null remove * the div. */ LabeledMarker.prototype.setText = function(text) { if (this.div_) { if (text) { this.div_.innerHTML = text; } else { // remove div GEvent.clearInstanceListeners(this.div_); this.div_.parentNode.removeChild(this.div_); this.div_ = null; } } else { if (text) { this.makeDiv_(); this.div_.innerHTML = text; this.redraw(); } } } /** * Move the text div based on current projection and zoom level, call the redraw() * handler in GMarker. * * @param {Boolean} force will be true when pixel coordinates need to be recomputed. */ LabeledMarker.prototype.redraw = function(force) { GMarker.prototype.redraw.apply(this, arguments); if (this.div_) { // Calculate the DIV coordinates of two opposite corners of our bounds to // get the size and position of our rectangle var p = this.map_.fromLatLngToDivPixel(this.latlng_); var z = GOverlay.getZIndex(this.latlng_.lat()); // Now position our div based on the div coordinates of our bounds this.div_.style.left = (p.x + this.labelOffset_.width) + "px"; this.div_.style.top = (p.y + this.labelOffset_.height) + "px"; this.div_.style.zIndex = z; // in front of the marker } } /** * Remove the text div from the map pane, destroy event passthrus, and calls the * default remove() handler in GMarker. */ LabeledMarker.prototype.remove = function() { this.setText(null); GMarker.prototype.remove.apply(this, arguments); } /** * Return a copy of this overlay, for the parent Map to duplicate itself in full. This * is part of the Overlay interface and is used, for example, to copy everything in the * main view into the mini-map. */ LabeledMarker.prototype.copy = function() { return new LabeledMarker(this.latlng_, this.opt_opts_); } |