[76] | 1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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| 2 | * full list of contributors). Published under the Clear BSD license. |
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| 3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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| 4 | * full text of the license. */ |
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| 5 | |
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| 6 | |
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| 7 | /** |
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| 8 | * @requires OpenLayers/Control/PanZoom.js |
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| 9 | */ |
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| 10 | |
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| 11 | /** |
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| 12 | * Class: OpenLayers.Control.PanZoomBar |
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| 13 | * The PanZoomBar is a visible control composed of a |
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| 14 | * <OpenLayers.Control.PanPanel> and a <OpenLayers.Control.ZoomBar>. |
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| 15 | * By default it is displayed in the upper left corner of the map as 4 |
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| 16 | * directional arrows above a vertical slider. |
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| 17 | * |
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| 18 | * Inherits from: |
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| 19 | * - <OpenLayers.Control.PanZoom> |
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| 20 | */ |
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| 21 | OpenLayers.Control.PanZoomBar = OpenLayers.Class(OpenLayers.Control.PanZoom, { |
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| 22 | |
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| 23 | /** |
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| 24 | * APIProperty: zoomStopWidth |
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| 25 | */ |
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| 26 | zoomStopWidth: 18, |
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| 27 | |
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| 28 | /** |
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| 29 | * APIProperty: zoomStopHeight |
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| 30 | */ |
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| 31 | zoomStopHeight: 11, |
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| 32 | |
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| 33 | /** |
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| 34 | * Property: slider |
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| 35 | */ |
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| 36 | slider: null, |
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| 37 | |
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| 38 | /** |
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| 39 | * Property: sliderEvents |
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| 40 | * {<OpenLayers.Events>} |
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| 41 | */ |
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| 42 | sliderEvents: null, |
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| 43 | |
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| 44 | /** |
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| 45 | * Property: zoombarDiv |
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| 46 | * {DOMElement} |
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| 47 | */ |
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| 48 | zoombarDiv: null, |
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| 49 | |
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| 50 | /** |
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| 51 | * Property: divEvents |
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| 52 | * {<OpenLayers.Events>} |
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| 53 | */ |
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| 54 | divEvents: null, |
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| 55 | |
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| 56 | /** |
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| 57 | * APIProperty: zoomWorldIcon |
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| 58 | * {Boolean} |
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| 59 | */ |
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| 60 | zoomWorldIcon: false, |
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| 61 | |
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| 62 | /** |
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| 63 | * APIProperty: forceFixedZoomLevel |
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| 64 | * {Boolean} Force a fixed zoom level even though the map has |
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| 65 | * fractionalZoom |
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| 66 | */ |
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| 67 | forceFixedZoomLevel: false, |
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| 68 | |
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| 69 | /** |
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| 70 | * Property: mouseDragStart |
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| 71 | * {<OpenLayers.Pixel>} |
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| 72 | */ |
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| 73 | mouseDragStart: null, |
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| 74 | |
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| 75 | /** |
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| 76 | * Property: zoomStart |
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| 77 | * {<OpenLayers.Pixel>} |
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| 78 | */ |
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| 79 | zoomStart: null, |
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| 80 | |
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| 81 | /** |
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| 82 | * Constructor: OpenLayers.Control.PanZoomBar |
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| 83 | */ |
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| 84 | initialize: function() { |
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| 85 | OpenLayers.Control.PanZoom.prototype.initialize.apply(this, arguments); |
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| 86 | }, |
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| 87 | |
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| 88 | /** |
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| 89 | * APIMethod: destroy |
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| 90 | */ |
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| 91 | destroy: function() { |
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| 92 | |
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| 93 | this._removeZoomBar(); |
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| 94 | |
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| 95 | this.map.events.un({ |
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| 96 | "changebaselayer": this.redraw, |
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| 97 | scope: this |
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| 98 | }); |
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| 99 | |
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| 100 | OpenLayers.Control.PanZoom.prototype.destroy.apply(this, arguments); |
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| 101 | |
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| 102 | delete this.mouseDragStart; |
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| 103 | delete this.zoomStart; |
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| 104 | }, |
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| 105 | |
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| 106 | /** |
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| 107 | * Method: setMap |
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| 108 | * |
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| 109 | * Parameters: |
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| 110 | * map - {<OpenLayers.Map>} |
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| 111 | */ |
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| 112 | setMap: function(map) { |
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| 113 | OpenLayers.Control.PanZoom.prototype.setMap.apply(this, arguments); |
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| 114 | this.map.events.register("changebaselayer", this, this.redraw); |
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| 115 | }, |
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| 116 | |
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| 117 | /** |
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| 118 | * Method: redraw |
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| 119 | * clear the div and start over. |
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| 120 | */ |
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| 121 | redraw: function() { |
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| 122 | if (this.div != null) { |
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| 123 | this.removeButtons(); |
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| 124 | this._removeZoomBar(); |
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| 125 | } |
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| 126 | this.draw(); |
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| 127 | }, |
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| 128 | |
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| 129 | /** |
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| 130 | * Method: draw |
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| 131 | * |
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| 132 | * Parameters: |
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| 133 | * px - {<OpenLayers.Pixel>} |
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| 134 | */ |
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| 135 | draw: function(px) { |
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| 136 | // initialize our internal div |
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| 137 | OpenLayers.Control.prototype.draw.apply(this, arguments); |
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| 138 | px = this.position.clone(); |
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| 139 | |
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| 140 | // place the controls |
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| 141 | this.buttons = []; |
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| 142 | |
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| 143 | var sz = new OpenLayers.Size(18,18); |
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| 144 | var centered = new OpenLayers.Pixel(px.x+sz.w/2, px.y); |
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| 145 | var wposition = sz.w; |
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| 146 | |
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| 147 | if (this.zoomWorldIcon) { |
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| 148 | centered = new OpenLayers.Pixel(px.x+sz.w, px.y); |
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| 149 | } |
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| 150 | |
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| 151 | this._addButton("panup", "north-mini.png", centered, sz); |
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| 152 | px.y = centered.y+sz.h; |
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| 153 | this._addButton("panleft", "west-mini.png", px, sz); |
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| 154 | if (this.zoomWorldIcon) { |
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| 155 | this._addButton("zoomworld", "zoom-world-mini.png", px.add(sz.w, 0), sz); |
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| 156 | |
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| 157 | wposition *= 2; |
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| 158 | } |
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| 159 | this._addButton("panright", "east-mini.png", px.add(wposition, 0), sz); |
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| 160 | this._addButton("pandown", "south-mini.png", centered.add(0, sz.h*2), sz); |
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| 161 | this._addButton("zoomin", "zoom-plus-mini.png", centered.add(0, sz.h*3+5), sz); |
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| 162 | centered = this._addZoomBar(centered.add(0, sz.h*4 + 5)); |
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| 163 | this._addButton("zoomout", "zoom-minus-mini.png", centered, sz); |
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| 164 | return this.div; |
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| 165 | }, |
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| 166 | |
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| 167 | /** |
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| 168 | * Method: _addZoomBar |
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| 169 | * |
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| 170 | * Parameters: |
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| 171 | * location - {<OpenLayers.Pixel>} where zoombar drawing is to start. |
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| 172 | */ |
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| 173 | _addZoomBar:function(centered) { |
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| 174 | var imgLocation = OpenLayers.Util.getImagesLocation(); |
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| 175 | |
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| 176 | var id = this.id + "_" + this.map.id; |
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| 177 | var zoomsToEnd = this.map.getNumZoomLevels() - 1 - this.map.getZoom(); |
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| 178 | var slider = OpenLayers.Util.createAlphaImageDiv(id, |
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| 179 | centered.add(-1, zoomsToEnd * this.zoomStopHeight), |
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| 180 | new OpenLayers.Size(20,9), |
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| 181 | imgLocation+"slider.png", |
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| 182 | "absolute"); |
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| 183 | this.slider = slider; |
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| 184 | |
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| 185 | this.sliderEvents = new OpenLayers.Events(this, slider, null, true, |
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| 186 | {includeXY: true}); |
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| 187 | this.sliderEvents.on({ |
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| 188 | "mousedown": this.zoomBarDown, |
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| 189 | "mousemove": this.zoomBarDrag, |
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| 190 | "mouseup": this.zoomBarUp, |
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| 191 | "dblclick": this.doubleClick, |
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| 192 | "click": this.doubleClick |
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| 193 | }); |
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| 194 | |
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| 195 | var sz = new OpenLayers.Size(); |
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| 196 | sz.h = this.zoomStopHeight * this.map.getNumZoomLevels(); |
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| 197 | sz.w = this.zoomStopWidth; |
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| 198 | var div = null; |
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| 199 | |
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| 200 | if (OpenLayers.Util.alphaHack()) { |
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| 201 | var id = this.id + "_" + this.map.id; |
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| 202 | div = OpenLayers.Util.createAlphaImageDiv(id, centered, |
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| 203 | new OpenLayers.Size(sz.w, |
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| 204 | this.zoomStopHeight), |
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| 205 | imgLocation + "zoombar.png", |
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| 206 | "absolute", null, "crop"); |
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| 207 | div.style.height = sz.h + "px"; |
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| 208 | } else { |
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| 209 | div = OpenLayers.Util.createDiv( |
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| 210 | 'OpenLayers_Control_PanZoomBar_Zoombar' + this.map.id, |
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| 211 | centered, |
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| 212 | sz, |
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| 213 | imgLocation+"zoombar.png"); |
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| 214 | } |
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| 215 | |
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| 216 | this.zoombarDiv = div; |
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| 217 | |
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| 218 | this.divEvents = new OpenLayers.Events(this, div, null, true, |
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| 219 | {includeXY: true}); |
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| 220 | this.divEvents.on({ |
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| 221 | "mousedown": this.divClick, |
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| 222 | "mousemove": this.passEventToSlider, |
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| 223 | "dblclick": this.doubleClick, |
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| 224 | "click": this.doubleClick |
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| 225 | }); |
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| 226 | |
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| 227 | this.div.appendChild(div); |
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| 228 | |
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| 229 | this.startTop = parseInt(div.style.top); |
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| 230 | this.div.appendChild(slider); |
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| 231 | |
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| 232 | this.map.events.register("zoomend", this, this.moveZoomBar); |
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| 233 | |
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| 234 | centered = centered.add(0, |
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| 235 | this.zoomStopHeight * this.map.getNumZoomLevels()); |
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| 236 | return centered; |
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| 237 | }, |
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| 238 | |
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| 239 | /** |
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| 240 | * Method: _removeZoomBar |
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| 241 | */ |
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| 242 | _removeZoomBar: function() { |
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| 243 | this.sliderEvents.un({ |
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| 244 | "mousedown": this.zoomBarDown, |
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| 245 | "mousemove": this.zoomBarDrag, |
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| 246 | "mouseup": this.zoomBarUp, |
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| 247 | "dblclick": this.doubleClick, |
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| 248 | "click": this.doubleClick |
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| 249 | }); |
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| 250 | this.sliderEvents.destroy(); |
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| 251 | |
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| 252 | this.divEvents.un({ |
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| 253 | "mousedown": this.divClick, |
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| 254 | "mousemove": this.passEventToSlider, |
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| 255 | "dblclick": this.doubleClick, |
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| 256 | "click": this.doubleClick |
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| 257 | }); |
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| 258 | this.divEvents.destroy(); |
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| 259 | |
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| 260 | this.div.removeChild(this.zoombarDiv); |
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| 261 | this.zoombarDiv = null; |
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| 262 | this.div.removeChild(this.slider); |
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| 263 | this.slider = null; |
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| 264 | |
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| 265 | this.map.events.unregister("zoomend", this, this.moveZoomBar); |
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| 266 | }, |
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| 267 | |
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| 268 | /** |
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| 269 | * Method: passEventToSlider |
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| 270 | * This function is used to pass events that happen on the div, or the map, |
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| 271 | * through to the slider, which then does its moving thing. |
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| 272 | * |
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| 273 | * Parameters: |
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| 274 | * evt - {<OpenLayers.Event>} |
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| 275 | */ |
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| 276 | passEventToSlider:function(evt) { |
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| 277 | this.sliderEvents.handleBrowserEvent(evt); |
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| 278 | }, |
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| 279 | |
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| 280 | /** |
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| 281 | * Method: divClick |
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| 282 | * Picks up on clicks directly on the zoombar div |
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| 283 | * and sets the zoom level appropriately. |
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| 284 | */ |
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| 285 | divClick: function (evt) { |
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| 286 | if (!OpenLayers.Event.isLeftClick(evt)) { |
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| 287 | return; |
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| 288 | } |
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| 289 | var y = evt.xy.y; |
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| 290 | var top = OpenLayers.Util.pagePosition(evt.object)[1]; |
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| 291 | var levels = (y - top)/this.zoomStopHeight; |
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| 292 | if(this.forceFixedZoomLevel || !this.map.fractionalZoom) { |
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| 293 | levels = Math.floor(levels); |
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| 294 | } |
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| 295 | var zoom = (this.map.getNumZoomLevels() - 1) - levels; |
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| 296 | zoom = Math.min(Math.max(zoom, 0), this.map.getNumZoomLevels() - 1); |
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| 297 | this.map.zoomTo(zoom); |
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| 298 | OpenLayers.Event.stop(evt); |
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| 299 | }, |
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| 300 | |
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| 301 | /* |
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| 302 | * Method: zoomBarDown |
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| 303 | * event listener for clicks on the slider |
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| 304 | * |
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| 305 | * Parameters: |
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| 306 | * evt - {<OpenLayers.Event>} |
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| 307 | */ |
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| 308 | zoomBarDown:function(evt) { |
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| 309 | if (!OpenLayers.Event.isLeftClick(evt)) { |
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| 310 | return; |
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| 311 | } |
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| 312 | this.map.events.on({ |
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| 313 | "mousemove": this.passEventToSlider, |
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| 314 | "mouseup": this.passEventToSlider, |
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| 315 | scope: this |
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| 316 | }); |
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| 317 | this.mouseDragStart = evt.xy.clone(); |
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| 318 | this.zoomStart = evt.xy.clone(); |
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| 319 | this.div.style.cursor = "move"; |
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| 320 | // reset the div offsets just in case the div moved |
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| 321 | this.zoombarDiv.offsets = null; |
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| 322 | OpenLayers.Event.stop(evt); |
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| 323 | }, |
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| 324 | |
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| 325 | /* |
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| 326 | * Method: zoomBarDrag |
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| 327 | * This is what happens when a click has occurred, and the client is |
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| 328 | * dragging. Here we must ensure that the slider doesn't go beyond the |
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| 329 | * bottom/top of the zoombar div, as well as moving the slider to its new |
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| 330 | * visual location |
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| 331 | * |
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| 332 | * Parameters: |
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| 333 | * evt - {<OpenLayers.Event>} |
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| 334 | */ |
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| 335 | zoomBarDrag:function(evt) { |
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| 336 | if (this.mouseDragStart != null) { |
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| 337 | var deltaY = this.mouseDragStart.y - evt.xy.y; |
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| 338 | var offsets = OpenLayers.Util.pagePosition(this.zoombarDiv); |
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| 339 | if ((evt.clientY - offsets[1]) > 0 && |
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| 340 | (evt.clientY - offsets[1]) < parseInt(this.zoombarDiv.style.height) - 2) { |
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| 341 | var newTop = parseInt(this.slider.style.top) - deltaY; |
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| 342 | this.slider.style.top = newTop+"px"; |
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| 343 | this.mouseDragStart = evt.xy.clone(); |
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| 344 | } |
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| 345 | OpenLayers.Event.stop(evt); |
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| 346 | } |
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| 347 | }, |
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| 348 | |
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| 349 | /* |
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| 350 | * Method: zoomBarUp |
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| 351 | * Perform cleanup when a mouseup event is received -- discover new zoom |
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| 352 | * level and switch to it. |
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| 353 | * |
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| 354 | * Parameters: |
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| 355 | * evt - {<OpenLayers.Event>} |
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| 356 | */ |
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| 357 | zoomBarUp:function(evt) { |
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| 358 | if (!OpenLayers.Event.isLeftClick(evt)) { |
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| 359 | return; |
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| 360 | } |
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| 361 | if (this.mouseDragStart) { |
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| 362 | this.div.style.cursor=""; |
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| 363 | this.map.events.un({ |
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| 364 | "mouseup": this.passEventToSlider, |
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| 365 | "mousemove": this.passEventToSlider, |
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| 366 | scope: this |
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| 367 | }); |
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| 368 | var deltaY = this.zoomStart.y - evt.xy.y; |
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| 369 | var zoomLevel = this.map.zoom; |
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| 370 | if (!this.forceFixedZoomLevel && this.map.fractionalZoom) { |
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| 371 | zoomLevel += deltaY/this.zoomStopHeight; |
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| 372 | zoomLevel = Math.min(Math.max(zoomLevel, 0), |
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| 373 | this.map.getNumZoomLevels() - 1); |
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| 374 | } else { |
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| 375 | zoomLevel += Math.round(deltaY/this.zoomStopHeight); |
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| 376 | } |
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| 377 | this.map.zoomTo(zoomLevel); |
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| 378 | this.mouseDragStart = null; |
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| 379 | this.zoomStart = null; |
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| 380 | OpenLayers.Event.stop(evt); |
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| 381 | } |
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| 382 | }, |
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| 383 | |
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| 384 | /* |
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| 385 | * Method: moveZoomBar |
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| 386 | * Change the location of the slider to match the current zoom level. |
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| 387 | */ |
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| 388 | moveZoomBar:function() { |
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| 389 | var newTop = |
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| 390 | ((this.map.getNumZoomLevels()-1) - this.map.getZoom()) * |
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| 391 | this.zoomStopHeight + this.startTop + 1; |
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| 392 | this.slider.style.top = newTop + "px"; |
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| 393 | }, |
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| 394 | |
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| 395 | CLASS_NAME: "OpenLayers.Control.PanZoomBar" |
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| 396 | }); |
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