/* 
 * Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
 * license.  See http://svn.openlayers.org/trunk/openlayers/license.txt for the
 * full text of the license.
 * @version ifn 0.1
 * based on http://dev.openlayers.org/sandbox/jvanulden/openlayers/examples/extended-layerswitcher.html and OpenLayers.Control.layerswitcher
  */

/** 
 * @requires OpenLayers/Control.js
 */

/**
 * Class: OpenLayers.Control.IfnLayerSwitcher
 *
 * Inherits from:
 *  - <OpenLayers.Control>
 */
OpenLayers.Control.IfnLayerSwitcher = 
  OpenLayers.Class(OpenLayers.Control, {

    /**  
     * Property: activeColor
     * {String}
     */
    activeColor: "#3c6823",
    
    /**  
     * Property: layerStates 
     * {Array(Object)} Basically a copy of the "state" of the map's layers 
     *     the last time the control was drawn. We have this in order to avoid
     *     unnecessarily redrawing the control.
     */
    layerStates: null,
    

  // DOM Elements
  
    /**
     * Property: layersDiv
     * {DOMElement} 
     */
    layersDiv: null,
    
    /** 
     * Property: baseLayersDiv
     * {DOMElement}
     */
    baseLayersDiv: null,

    /** 
     * Property: baseLayers
     * {Array(<OpenLayers.Layer>)}
     */
    baseLayers: null,
    
    
    /** 
     * Property: dataLbl
     * {DOMElement} 
     */
    dataLbl: null,
    
    /** 
     * Property: dataLayersDiv
     * {DOMElement} 
     */
    dataLayersDiv: null,

    /** 
     * Property: dataLayers
     * {Array(<OpenLayers.Layer>)} 
     */
    dataLayers: null,

    /** 
     * Property: activeLayer
     */
    activeLayer: null,    
    
    /** 
     * Property: useLegendGraphics
     */
    useLegendGraphics: false,
    
    /** 
     * Property: minimizeDiv
     * {DOMElement} 
     */
    minimizeDiv: null,

    /** 
     * Property: maximizeDiv
     * {DOMElement} 
     */
    maximizeDiv: null,
    
    /**
     * APIProperty: ascending
     * {Boolean} 
     */
    ascending: true,
 
    /**
     * Constructor: OpenLayers.Control.IfnLayerSwitcher
     * 
     * Parameters:
     * options - {Object}
     */
    initialize: function(options) {
        OpenLayers.Control.prototype.initialize.apply(this, arguments);
        this.layerStates = [];
    },

    /**
     * APIMethod: destroy 
     */    
    destroy: function() {
        
        OpenLayers.Event.stopObservingElement(this.div);

        OpenLayers.Event.stopObservingElement(this.minimizeDiv);
        OpenLayers.Event.stopObservingElement(this.maximizeDiv);

        //clear out layers info and unregister their events 
        this.clearLayersArray("base");
        this.clearLayersArray("data");
        
        this.map.events.un({
            "addlayer": this.redraw,
            "changelayer": this.redraw,
            "removelayer": this.redraw,
            "changebaselayer": this.redraw,
            scope: this
        });

        OpenLayers.Control.prototype.destroy.apply(this, arguments);
    },

    /** 
     * Method: setMap
     *
     * Properties:
     * map - {<OpenLayers.Map>} 
     */
    setMap: function(map) {
        OpenLayers.Control.prototype.setMap.apply(this, arguments);
        
        this.map.events.on({
            "addlayer": this.redraw,
            "changelayer": this.redraw,
            "removelayer": this.redraw,
            "changebaselayer": this.redraw,
            scope: this
        });
    },

    /**
     * Method: draw
     *
     * Returns:
     * {DOMElement} A reference to the DIV DOMElement containing the 
     *     switcher tabs.
     */  
    draw: function() {
        OpenLayers.Control.prototype.draw.apply(this);

        // create layout divs
        this.loadContents();

        // set mode to minimize
        if(!this.outsideViewport) {
            this.minimizeControl();
        }

        // populate div with current info
        this.redraw();    

        return this.div;
    },

    /** 
     * Method: clearLayersArray
     * User specifies either "base" or "data". we then clear all the
     *     corresponding listeners, the div, and reinitialize a new array.
     * 
     * Parameters:
     * layersType - {String}  
     */
    clearLayersArray: function(layersType) {
        var layers = this[layersType + "Layers"];
        if (layers) {
            for(var i=0, len=layers.length; i<len ; i++) {
                var layer = layers[i];
                OpenLayers.Event.stopObservingElement(layer.inputElem);
                OpenLayers.Event.stopObservingElement(layer.labelSpan);
            }
        }
        this[layersType + "LayersDiv"].innerHTML = "";
        this[layersType + "Layers"] = [];
    },


    /**
     * Method: checkRedraw
     * Checks if the layer state has changed since the last redraw() call.
     * 
     * Returns:
     * {Boolean} The layer state changed since the last redraw() call. 
     */
    checkRedraw: function() {
        var redraw = false;
        if ( !this.layerStates.length ||
             (this.map.layers.length != this.layerStates.length) ) {
            redraw = true;
        } else {
            for (var i=0, len=this.layerStates.length; i<len; i++) {
                var layerState = this.layerStates[i];
                var layer = this.map.layers[i];
                if ( (layerState.name != layer.name) || 
                     (layerState.inRange != layer.inRange) || 
                     (layerState.id != layer.id) || 
                     (layerState.visibility != layer.visibility) ) {
                    redraw = true;
                    break;
                }    
            }
        }    
        return redraw;
    },
    
    /** 
     * Method: redraw
     * Goes through and takes the current state of the Map and rebuilds the
     *     control to display that state. Groups base layers into a 
     *     radio-button group and lists each data layer with a checkbox.
     *
     * Returns: 
     * {DOMElement} A reference to the DIV DOMElement containing the control
     */  
    redraw: function() {
        //if the state hasn't changed since last redraw, no need 
        // to do anything. Just return the existing div.
        if (!this.checkRedraw()) { 
            return this.div; 
        } 

        //clear out previous layers 
        this.clearLayersArray("base");
        this.clearLayersArray("data");
        
        var containsOverlays = false;
        var containsBaseLayers = false;
        
        // Save state -- for checking layer if the map state changed.
        // We save this before redrawing, because in the process of redrawing
        // we will trigger more visibility changes, and we want to not redraw
        // and enter an infinite loop.
        var len = this.map.layers.length;
        this.layerStates = new Array(len);
        for (var i=0; i <len; i++) {
            var layer = this.map.layers[i];
            this.layerStates[i] = {
                'name': layer.name, 
                'visibility': layer.visibility,
                'inRange': layer.inRange,
                'id': layer.id
            };
        }    

        var layers = this.map.layers.slice();
        if (!this.ascending) { layers.reverse(); }
        for(var i=0, len=layers.length; i<len; i++) {
            var layer = layers[i];
            var baseLayer = layer.isBaseLayer;

            if (layer.displayInLayerSwitcher ) {

                if (baseLayer) {
                    containsBaseLayers = true;
                } else {
                    containsOverlays = true;
                }
                
                // only check a baselayer if it is *the* baselayer, check data
                // layers if they are visible
                var checked = (baseLayer) ? (layer == this.map.baseLayer)
                                          : layer.getVisibility();
                
                var layerWrapper = document.createElement("div");
                layerWrapper.id = "layer_" + layer.id;
                
                // create input element
                var inputElem = document.createElement("input");
                inputElem.id = this.id + "_input_" + layer.name;
                inputElem.name = (baseLayer) ? "baseLayers" : layer.name;
                inputElem.type = (baseLayer) ? "radio" : "checkbox";
                inputElem.value = layer.name;
                inputElem.checked = checked;
                inputElem.defaultChecked = checked;
                inputElem.style.display='none';

                if (!baseLayer && !layer.inRange) {
                    inputElem.disabled = true;
                }

                // create the label span
                var labelSpan = document.createElement("span");
                if (!baseLayer && !layer.inRange) {
                    labelSpan.style.color = "gray";
                }
                
                labelSpan.style.cursor = "pointer";
                labelSpan.innerHTML = (layer.options)?layer.options.label ||layer.name:layer.name;
                labelSpan.style.display = "inline";
                //labelSpan.style.width = "210px";
                labelSpan.style.padding = "0px 6px 2px 4px";
                labelSpan.style.verticalAlign = (baseLayer) ? "bottom" : "baseline";
               
                // create the title div
                var titleDiv = document.createElement("div");
                titleDiv.id = "title_" + layer.id;
                titleDiv.style.backgroundColor = "#e1e1e1";
                titleDiv.style.width = "220px";
                titleDiv.style.padding = "2px";
                titleDiv.style.border = "solid 1px #e1e1e1";
                titleDiv.style.position = "relative";
                
                // create the layer operation panel
                var buttonSpan = document.createElement("span")
                buttonSpan.style.padding = "3px 3px 3px 0";
                
                // remove control
                /*
                var removeButton = document.createElement("img");
                removeButton.src = OpenLayers.Util.getImagesLocation() + "del.png";
                removeButton.style.cursor = "pointer";
                removeButton.alt = OpenLayers.i18n("remove_layer");
                removeButton.title = OpenLayers.i18n("remove_layer");
                */
                //var removeButton = document.createElement("span");
                //imgSrc = OpenLayers.Util.getImagesLocation() + "del.png";
                //removeButton.style.backgroundImage = "url('" + imgSrc + "')";
                //removeButton.style.display = "inline-block";
                //removeButton.style.width = "12px";
                //removeButton.style.height = "12px";
                
                // layer order controls
                var upButton = document.createElement("img");
                upButton.src = OpenLayers.Util.getImagesLocation() + "up.png";
                upButton.style.cursor = "pointer";  
                upButton.alt = OpenLayers.i18n("move_layer_up");
                upButton.title = OpenLayers.i18n("move_layer_up");
                
                var downButton = document.createElement("img");
                downButton.src = OpenLayers.Util.getImagesLocation() + "down.png";
                downButton.style.cursor = "pointer";
                downButton.alt = OpenLayers.i18n("move_layer_down");
                downButton.title = OpenLayers.i18n("move_layer_down");
                
                // opacity controls
                var opacityMinusButton = document.createElement("img");
                opacityMinusButton.src = OpenLayers.Util.getImagesLocation() + "minus.png";
                opacityMinusButton.style.cursor = "pointer";
                opacityMinusButton.alt = OpenLayers.i18n("decrease_opacity");
                opacityMinusButton.title = OpenLayers.i18n("decrease_opacity");
                
                var opacitySpan = document.createElement("span");                
                opacitySpan.setAttribute("id", "opacityValue_" + layer.id); 
                opacitySpan.style.width = "23px";
                opacitySpan.style.display = "inline-block";                
                
                var opacityImg = document.createElement("img");
                opacityImg.setAttribute("id", "opacityImg_" + layer.id); 
                opacityImg.src = OpenLayers.Util.getImagesLocation() + "opacity.png";
                opacityImg.width = "23";
                opacityImg.height = "12";
                opacityImg.alt = OpenLayers.i18n("opacity");
                opacityImg.title = OpenLayers.i18n("opacity");
                
                var opacityTextInput = document.createElement("input");                
                opacityTextInput.setAttribute("id", "opacity_" + layer.id); 
                opacityTextInput.setAttribute("type", "hidden");
                opacityTextInput.setAttribute("value", "1.0");
                
                var opacityPlusButton = document.createElement("img");
                opacityPlusButton.src = OpenLayers.Util.getImagesLocation() + "plus.png";
                opacityPlusButton.style.cursor = "pointer";
                opacityPlusButton.alt = OpenLayers.i18n("increase_opacity");
                opacityPlusButton.title = OpenLayers.i18n("increase_opacity");
                
                // set the default opacity
                layer.setOpacity("1.0");    
                
                var context = {
                    'layer': layer,
                    'inputElem': inputElem,
                    'titleDiv': titleDiv,
                    'layerSwitcher': this
                };                   
                                              
                // bind events to the layer operation buttons
                OpenLayers.Event.observe(inputElem, "mouseup", 
                    OpenLayers.Function.bindAsEventListener(this.onInputClick, context)
                );
                
                OpenLayers.Event.observe(labelSpan, "click", 
                    OpenLayers.Function.bindAsEventListener(this.onTitleClick, context)
                );
                
                OpenLayers.Event.observe(upButton, "click", 
                    OpenLayers.Function.bindAsEventListener(this.onUpClick, context)
                );
                
                OpenLayers.Event.observe(downButton, "click", 
                    OpenLayers.Function.bindAsEventListener(this.onDownClick, context)
                );
                /*
                OpenLayers.Event.observe(removeButton, "click", 
                    OpenLayers.Function.bindAsEventListener(this.onRemoveClick, context)
                );
                */
                var opacityMinusContext = {
                    'layer': layer,
                    'byOpacity': '-0.1',
                    'layerSwitcher': this
                };
                OpenLayers.Event.observe(opacityMinusButton, "click", 
                    OpenLayers.Function.bindAsEventListener(this.changeLayerOpacity, opacityMinusContext)
                );
                
                var opacityPlusContext = {
                    'layer': layer,
                    'byOpacity': '0.1',
                    'layerSwitcher': this
                };
                OpenLayers.Event.observe(opacityPlusButton, "click", 
                    OpenLayers.Function.bindAsEventListener(this.changeLayerOpacity, opacityPlusContext)
                );
                
                // create line break
                var br = document.createElement("br");
                
                var groupArray = (baseLayer) ? this.baseLayers
                                             : this.dataLayers;
                groupArray.push({
                    'layer': layer,
                    'inputElem': inputElem,
                    'titleDiv': titleDiv,
                    'labelSpan': labelSpan
                });
                                                     
                var groupDiv = (baseLayer) ? this.baseLayersDiv
                                           : this.dataLayersDiv;
                                           
                groupDiv.appendChild(layerWrapper);
                layerWrapper.appendChild(titleDiv);                           
                titleDiv.appendChild(inputElem);
                titleDiv.appendChild(buttonSpan);            
                buttonSpan.appendChild(upButton);
                buttonSpan.appendChild(downButton);
               // buttonSpan.appendChild(removeButton);
                buttonSpan.appendChild(opacityMinusButton);
                opacitySpan.appendChild(opacityImg);
                buttonSpan.appendChild(opacitySpan);
                buttonSpan.appendChild(opacityTextInput);
                buttonSpan.appendChild(opacityPlusButton);
                titleDiv.appendChild(labelSpan); 
                groupDiv.appendChild(br);            
              
            }  

        }

        // if no overlays, dont display the overlay label
        this.dataLbl.style.display = (containsOverlays) ? "" 
                                                        : "none";
        
        // if no baselayers, dont display the baselayer label
        this.baseLbl.style.display = (containsBaseLayers) ? "" 
                                                          : "none";  
        
        if(this.useLegendGraphics){ this.getLegendGraphics(this.useLegendGraphics) };
        
        return this.div;        
    },
    
    /** 
     * Method:
     * Load legend images using OGC GetLegendGraphic request
     *
     * NOTE: this will only work for layers that are hosted
     * on an OGC WMS service.
     * 
     * Parameters:
     * enableRedraw - If true legend graphics are redrawn with
     *                layerSwitcher, if false legend graphics
     *                are only drawn on request.
     */
    getLegendGraphics: function(enableRedraw)
    {
        this.useLegendGraphics = (enableRedraw) ? true : false;
        
        var len = this.map.layers.length;
        for (var i=0; i <len; i++) 
        {
            var layer = this.map.layers[i];
            var layerWrapper = OpenLayers.Util.getElement("layer_" + layer.id);
            var legendImg = document.createElement("img");    
            
            var context = {
                    'legendImg': legendImg,
                    'layerSwitcher': this
                };
                
            // if the service doesn't return an image, insert a transparent gif
            OpenLayers.Event.observe(legendImg, "error",
                OpenLayers.Function.bind(this.onLegendImgError, context)
            );        
            
            if(layer.isBaseLayer == false)
            {
                // build getLegendGraphic request
                var legendGraphicURL = layer.getFullRequestString({
                          REQUEST: "GetLegendGraphic",
                          LAYER: layer.params.LAYERS,
                          FORMAT: "image/png",
                          WIDTH: "150"});
                          
                legendImg.src = legendGraphicURL;                
                layerWrapper.appendChild(legendImg);
            }
        }    
    },
    
    /**
     * Method: onLegendImgError
     * Load blank image if getLegendGraphic request fails
     * 
     * Parameters: 
     * e - {Event} 
     */
    onLegendImgError: function(e)
    {
        this.legendImg.src = OpenLayers.Util.getImagesLocation() + 'blank.gif';
        
        OpenLayers.Event.stop(e); 
    },
    
    /** 
     * Method:
     * A label has been clicked, check or uncheck its corresponding input
     * 
     * Parameters:
     * e - {Event} 
     *
     * Context:  
     *  - {DOMElement} inputElem
     *  - {<OpenLayers.Control.IfnLayerSwitcher>} layerSwitcher
     *  - {<OpenLayers.Layer>} layer
     */

    onInputClick: function(e) {
        if (!this.inputElem.disabled) {
            if (this.inputElem.type == "radio") {
                this.inputElem.checked = true;
                this.layer.map.setBaseLayer(this.layer);
            } else {
                this.inputElem.checked = !this.inputElem.checked;
                this.layerSwitcher.updateMap();
            }
        }
        
        OpenLayers.Event.stop(e);
    },    

    /**
     * Method: onRemoveClick
     * Remove the layer from the map
     * 
     * Parameters: 
     * e - {Event} 
     */
    onRemoveClick: function(e)
    {
        this.layerSwitcher.map.removeLayer(this.layer);
        
        OpenLayers.Event.stop(e); 
    },
    
    /**
     * Method: onDownClick
     * Set the layer position down one level
     * 
     * Parameters: 
     * e - {Event} 
     */
    onDownClick: function(e)
    {
        this.layerSwitcher.map.raiseLayer(this.layer, this.layerSwitcher.ascending?1:-1);  
        
        OpenLayers.Event.stop(e);
    },
    
    /**
     * Method: onUpClick
     * Set the layer position up one level
     * 
     * Parameters: 
     * e - {Event} 
     */
    onUpClick: function(e)
    {
        
        this.layerSwitcher.map.raiseLayer(this.layer, this.layerSwitcher.ascending?-1:1);
        
        OpenLayers.Event.stop(e);
    },
    
     /**
     * Method: onTitleClick
     * Set the active layer
     * 
     * Parameters: 
     * e - {Event} 
     */
    onTitleClick: function(e) {
		var map =this.layer.map;
        var id = this.layer.id;
       
        layerSwitcher.activeLayer = id;
        
        for (var i=0; i<map.layers.length;i++) 
        { 
          var layer = map.layers[i]; 
          
          if(id == layer.id)
          {
            this.titleDiv.style.border = "solid 1px #333";
          }
          else
          {           
            var div = OpenLayers.Util.getElement("title_" + layer.id); 
            
            if(div)
            { 
                div.style.border = "solid 1px #e1e1e1";
            }
          }           
        }        
        
        OpenLayers.Event.stop(e);
    },
    
    /**
     * Method: onLayerClick
     * Need to update the map accordingly whenever user clicks in either of
     *     the layers.
     * 
     * Parameters: 
     * e - {Event} 
     */
    onLayerClick: function(e) {
        this.updateMap();
    },

    /**
     * Method: changeLayerOpacity
     * Changes opacity of a given layer for a given delta
     * 
     * Parameters: 
     * e - {Event} 
     *
     * Context:  
     *  - {string} amount to increase or decrease opacity value
     *  - {<OpenLayers.Layer>} layer
     *  - {<OpenLayers.Control.IfnLayerSwitcher>} layerSwitcher
     */
    changeLayerOpacity: function(e) {
        var maxOpacity = 1.0;
        var minOpacity = 0.1;
        var i = parseFloat(this.byOpacity);
        var opacityElement = "opacity_" + this.layer.id;  
        var opacityImg = "opacityImg_" + this.layer.id;
        var newOpacity = (parseFloat(OpenLayers.Util.getElement(opacityElement).value) + i).toFixed(1);
        
        newOpacity = Math.min(maxOpacity, Math.max(minOpacity, newOpacity));
        
        OpenLayers.Util.getElement(opacityElement).value = newOpacity;
        OpenLayers.Util.getElement(opacityImg).width = (newOpacity * 23).toFixed(0);
        
        this.layer.setOpacity(newOpacity);
    },

    /** 
     * Method: updateMap
     * Cycles through the loaded data and base layer input arrays and makes
     *     the necessary calls to the Map object such that that the map's 
     *     visual state corresponds to what the user has selected in 
     *     the control.
     */
    updateMap: function() {

        // set the newly selected base layer        
        for(var i=0, len=this.baseLayers.length; i<len; i++) {
            var layerEntry = this.baseLayers[i];
            if (layerEntry.inputElem.checked) {
                this.map.setBaseLayer(layerEntry.layer, false);
            }
        }

        // set the correct visibilities for the overlays
        for(var i=0, len=this.dataLayers.length; i<len; i++) {
            var layerEntry = this.dataLayers[i];   
            layerEntry.layer.setVisibility(layerEntry.inputElem.checked);
        }
    },

    /** 
     * Method: maximizeControl
     * Set up the labels and divs for the control
     * 
     * Parameters:
     * e - {Event} 
     */
    maximizeControl: function(e) {

        //HACK HACK HACK - find a way to auto-size this layerswitcher
        this.div.style.width = "20em";
        this.div.style.height = "";

        this.showControls(false);

        if (e != null) {
            OpenLayers.Event.stop(e);
        }
    },
    
    /** 
     * Method: minimizeControl
     * Hide all the contents of the control, shrink the size, 
     *     add the maximize icon
     *
     * Parameters:
     * e - {Event} 
     */
    minimizeControl: function(e) {

        this.div.style.width = "0px";
        this.div.style.height = "0px";

        this.showControls(true);

        if (e != null) {
            OpenLayers.Event.stop(e);
        }
    },

    /**
     * Method: showControls
     * Hide/Show all LayerSwitcher controls depending on whether we are
     *     minimized or not
     * 
     * Parameters:
     * minimize - {Boolean}
     */
    showControls: function(minimize) {

        this.maximizeDiv.style.display = minimize ? "" : "none";
        this.minimizeDiv.style.display = minimize ? "none" : "";

        this.layersDiv.style.display = minimize ? "none" : "";
    },
    
    /** 
     * Method: loadContents
     * Set up the labels and divs for the control
     */
    loadContents: function() {

        //configure main div
        this.div.style.position = "absolute";
        this.div.style.top = "25px";
        this.div.style.right = "0px";
        this.div.style.left = "";
        this.div.style.fontFamily = "sans-serif";
        this.div.style.fontWeight = "bold";
        this.div.style.marginTop = "3px";
        this.div.style.marginLeft = "3px";
        this.div.style.marginBottom = "3px";
        this.div.style.fontSize = "13px";   
        this.div.style.color = "#333";   
        this.div.style.backgroundColor = "transparent";
    
        OpenLayers.Event.observe(this.div, "mouseup", 
            OpenLayers.Function.bindAsEventListener(this.mouseUp, this));
        OpenLayers.Event.observe(this.div, "click",
                      this.ignoreEvent);
        OpenLayers.Event.observe(this.div, "mousedown",
            OpenLayers.Function.bindAsEventListener(this.mouseDown, this));
        OpenLayers.Event.observe(this.div, "dblclick", this.ignoreEvent);

        // layers list div        
        this.layersDiv = document.createElement("div");
        this.layersDiv.id = this.id + "_layersDiv";
        this.layersDiv.style.paddingTop = "5px";
        this.layersDiv.style.paddingLeft = "5px";
        this.layersDiv.style.paddingBottom = "10px";
        this.layersDiv.style.paddingRight = "75px";
        this.layersDiv.style.backgroundColor = this.activeColor; 
        /*this.layersDiv.style.overflowX = "hidden"; 
        this.layersDiv.style.overflowY = "scroll";
        this.layersDiv.style.position = "relative";*/
        
        // ignore any mousewheel events
        OpenLayers.Event.observe(this.layersDiv, "mousewheel", this.ignoreEvent);

        // had to set width/height to get transparency in IE to work.
        // thanks -- http://jszen.blogspot.com/2005/04/ie6-opacity-filter-caveat.html
        
        this.layersDiv.style.height = "100%";
        this.baseLbl = document.createElement("div");
        this.baseLayersDiv = document.createElement("div");
        this.baseLayersDiv.style.display = "none";
        this.dataLbl = document.createElement("div");
        this.baseLbl.style.marginTop = "3px";
        this.baseLbl.style.marginLeft = "3px";
        this.baseLbl.style.marginBottom = "3px";
        this.dataLayersDiv = document.createElement("div");
        this.dataLayersDiv.style.paddingLeft = "10px";
       
        if (this.ascending) {
            this.layersDiv.appendChild(this.baseLbl);
            this.layersDiv.appendChild(this.baseLayersDiv);
            this.layersDiv.appendChild(this.dataLbl);
            this.layersDiv.appendChild(this.dataLayersDiv);
        } else {
            this.layersDiv.appendChild(this.dataLbl);
            this.layersDiv.appendChild(this.dataLayersDiv);
            this.layersDiv.appendChild(this.baseLbl);
            this.layersDiv.appendChild(this.baseLayersDiv);
        }    

        this.div.appendChild(this.layersDiv);

        OpenLayers.Rico.Corner.round(this.div, {corners: "tl bl",
                                        bgColor: "transparent",
                                        color: this.activeColor,
                                        blend: false});

        OpenLayers.Rico.Corner.changeOpacity(this.layersDiv, 0.75);

        var imgLocation = OpenLayers.Util.getImagesLocation();
        var sz = new OpenLayers.Size(18,18);

        // maximize button div
        var img = imgLocation + 'layer-switcher-maximize.png';
        this.maximizeDiv = OpenLayers.Util.createAlphaImageDiv(
                                    "OpenLayers_Control_MaximizeDiv", 
                                    null, 
                                    sz, 
                                    img, 
                                    "absolute");
        this.maximizeDiv.style.top = "5px";
        this.maximizeDiv.style.right = "0px";
        this.maximizeDiv.style.left = "";
        this.maximizeDiv.style.display = "none";
        OpenLayers.Event.observe(this.maximizeDiv, "click", 
            OpenLayers.Function.bindAsEventListener(this.maximizeControl, this)
        );
        
        this.div.appendChild(this.maximizeDiv);

        // minimize button div
        var img = imgLocation + 'layer-switcher-minimize.png';
        var sz = new OpenLayers.Size(18,18);
        this.minimizeDiv = OpenLayers.Util.createAlphaImageDiv(
                                    "OpenLayers_Control_MinimizeDiv", 
                                    null, 
                                    sz, 
                                    img, 
                                    "absolute");
        this.minimizeDiv.style.top = "5px";
        this.minimizeDiv.style.right = "0px";
        this.minimizeDiv.style.left = "";
        this.minimizeDiv.style.display = "none";
        OpenLayers.Event.observe(this.minimizeDiv, "click", 
            OpenLayers.Function.bindAsEventListener(this.minimizeControl, this)
        );

        this.div.appendChild(this.minimizeDiv);
    },
    
    /** 
     * Method: ignoreEvent
     * 
     * Parameters:
     * evt - {Event} 
     */
    ignoreEvent: function(evt) {
        OpenLayers.Event.stop(evt);
    },

    /** 
     * Method: mouseDown
     * Register a local 'mouseDown' flag so that we'll know whether or not
     *     to ignore a mouseUp event
     * 
     * Parameters:
     * evt - {Event}
     */
    mouseDown: function(evt) {
        this.isMouseDown = true;
        this.ignoreEvent(evt);
    },

    /** 
     * Method: mouseUp
     * If the 'isMouseDown' flag has been set, that means that the drag was 
     *     started from within the LayerSwitcher control, and thus we can 
     *     ignore the mouseup. Otherwise, let the Event continue.
     *  
     * Parameters:
     * evt - {Event} 
     */
    mouseUp: function(evt) {
        if (this.isMouseDown) {
            this.isMouseDown = false;
            this.ignoreEvent(evt);
        }
    },

    CLASS_NAME: "OpenLayers.Control.IfnLayerSwitcher"
});