0ba7961df4
improvements in the form of reduced memory use and lower element creating costs, hopefully making the OpenLayers code more usable in internet explorer as well as less of a memory hog in Firefox and other browsers. Additionally, a buffer is available around the main map grid which allows tiles to be loaded outside of the viewing area for faster dragging. git-svn-id: http://svn.openlayers.org/trunk/openlayers@1137 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
410 lines
13 KiB
JavaScript
410 lines
13 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
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* text of the license. */
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// @require: OpenLayers/Control.js
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/**
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* @class
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*/
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OpenLayers.Control.LayerSwitcher = Class.create();
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OpenLayers.Control.LayerSwitcher.prototype =
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Object.extend( new OpenLayers.Control(), {
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/** @type String */
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activeColor: "darkblue",
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// DOM Elements
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/** @type DOMElement */
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layersDiv: null,
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/** @type DOMElement */
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baseLayersDiv: null,
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/** @type Array */
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baseLayerInputs: null,
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/** @type DOMElement */
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dataLbl: null,
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/** @type DOMElement */
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dataLayersDiv: null,
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/** @type Array */
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dataLayerInputs: null,
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/** @type DOMElement */
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minimizeDiv: null,
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/** @type DOMElement */
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maximizeDiv: null,
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/**
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* @constructor
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*/
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initialize: function(options) {
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OpenLayers.Control.prototype.initialize.apply(this, arguments);
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},
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/**
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* @param {OpenLayers.Map} map
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*/
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setMap: function(map) {
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OpenLayers.Control.prototype.setMap.apply(this, arguments);
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this.map.events.register("addlayer", this, this.redraw);
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this.map.events.register("changelayer", this, this.redraw);
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this.map.events.register("removelayer", this, this.redraw);
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this.map.events.register("changebaselayer", this, this.redraw);
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},
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/**
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* @returns A reference to the DIV DOMElement containing the switcher tabs
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* @type DOMElement
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*/
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draw: function() {
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OpenLayers.Control.prototype.draw.apply(this);
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// create layout divs
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this.loadContents();
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// set mode to minimize
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this.minimizeControl();
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// populate div with current info
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this.redraw();
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return this.div;
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},
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/** Goes through and takes the current state of the Map and rebuilds the
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* control to display that state. Groups base layers into a radio-button
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* group and lists each data layer with a checkbox.
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*
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* @returns A reference to the DIV DOMElement containing the control
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* @type DOMElement
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*/
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redraw: function() {
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//clear out previous layers
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this.baseLayersDiv.innerHTML = "";
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this.baseLayerInputs = new Array();
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this.dataLayersDiv.innerHTML = "";
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this.dataLayerInputs = new Array();
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var containsOverlays = false;
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for( var i = 0; i < this.map.layers.length; i++) {
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var layer = this.map.layers[i];
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var baseLayer = layer.isBaseLayer;
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if (!baseLayer) {
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containsOverlays = true;
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}
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// only check a baselayer if it is *the* baselayer, check data
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// layers if they are visible
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var checked = (baseLayer) ? (layer == this.map.baseLayer)
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: layer.getVisibility();
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// create input element
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var inputElem = document.createElement("input");
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inputElem.id = "input_" + layer.name;
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inputElem.name = (baseLayer) ? "baseLayers" : layer.name;
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inputElem.type = (baseLayer) ? "radio" : "checkbox";
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inputElem.value = layer.name;
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inputElem.checked = checked;
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inputElem.layer = layer;
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// create span
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var labelSpan = document.createElement("span");
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labelSpan.innerHTML = layer.name;
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labelSpan.style.verticalAlign = (baseLayer) ? "bottom" : "auto";
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if (!(baseLayer && checked)) {
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Event.observe(labelSpan,
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"click",
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this.onLabelClick.bindAsEventListener(inputElem));
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}
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// create line break
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var br = document.createElement("br");
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var groupArray = (baseLayer) ? this.baseLayerInputs
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: this.dataLayerInputs;
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groupArray.push(inputElem);
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var groupDiv = (baseLayer) ? this.baseLayersDiv
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: this.dataLayersDiv;
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groupDiv.appendChild(inputElem);
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groupDiv.appendChild(labelSpan);
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groupDiv.appendChild(br);
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}
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// if no overlays, dont display the overlay label
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this.dataLbl.style.display = (containsOverlays) ? "" : "none";
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return this.div;
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},
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/** A label has been clicked, check or uncheck its corresponding input
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*
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* @private
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*
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* @param {Event} e
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*/
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onLabelClick: function(e) {
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this.checked = !this.checked;
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},
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/** Need to update the map accordingly whenever user clicks in either of
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* the layers.
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*
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* @private
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*
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* @param {Event} e
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*/
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onLayerClick: function(e) {
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this.updateMap();
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},
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/** Cycles through the loaded data and base layer input arrays and makes
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* the necessary calls to the Map object such that that the map's
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* visual state corresponds to what the user has selected in the control
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*
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* @private
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*/
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updateMap: function() {
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// set the newly selected base layer
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for(var i=0; i < this.baseLayerInputs.length; i++) {
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var input = this.baseLayerInputs[i];
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if (input.checked) {
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this.map.setBaseLayer(input.layer, true);
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}
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}
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// set the correct visibilities for the overlays
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for(var i=0; i < this.dataLayerInputs.length; i++) {
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var input = this.dataLayerInputs[i];
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input.layer.setVisibility(input.checked, true);
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}
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},
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/** Set up the labels and divs for the control
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*
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* @param {Event} e
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*/
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maximizeControl: function(e) {
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//HACK HACK HACK - find a way to auto-size this layerswitcher
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this.div.style.width = "20em";
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this.div.style.height = "";
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this.showControls(false);
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if (e != null) {
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Event.stop(e);
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}
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},
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/** Hide all the contents of the control, shrink the size,
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* add the maximize icon
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*
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* @param {Event} e
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*/
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minimizeControl: function(e) {
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this.div.style.width = "0px";
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this.div.style.height = "0px";
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this.showControls(true);
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if (e != null) {
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Event.stop(e);
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}
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},
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/** Hide/Show all LayerSwitcher controls depending on whether we are
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* minimized or not
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*
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* @private
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*
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* @param {Boolean} minimize
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*/
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showControls: function(minimize) {
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this.maximizeDiv.style.display = minimize ? "" : "none";
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this.minimizeDiv.style.display = minimize ? "none" : "";
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this.layersDiv.style.display = minimize ? "none" : "";
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},
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/** Set up the labels and divs for the control
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*
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*/
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loadContents: function() {
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//configure main div
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this.div.style.position = "absolute";
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this.div.style.top = "10px";
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this.div.style.right = "0px";
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this.div.style.left = "";
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this.div.style.fontFamily = "sans-serif";
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this.div.style.fontWeight = "bold";
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this.div.style.marginTop = "3px";
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this.div.style.marginLeft = "3px";
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this.div.style.marginBottom = "3px";
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this.div.style.fontSize = "smaller";
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this.div.style.color = "white";
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this.div.style.backgroundColor = "transparent";
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Event.observe(this.div, "mouseup",
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this.mouseUp.bindAsEventListener(this));
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Event.observe(this.div, "mousedown",
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this.mouseDown.bindAsEventListener(this));
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Event.observe(this.div, "dblclick", this.ignoreEvent);
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// layers list div
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this.layersDiv = document.createElement("div");
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this.layersDiv.id = "layersDiv";
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this.layersDiv.style.paddingTop = "5px";
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this.layersDiv.style.paddingLeft = "10px";
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this.layersDiv.style.paddingBottom = "5px";
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this.layersDiv.style.paddingRight = "75px";
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this.layersDiv.style.backgroundColor = this.activeColor;
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// had to set width/height to get transparency in IE to work.
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// thanks -- http://jszen.blogspot.com/2005/04/ie6-opacity-filter-caveat.html
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//
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this.layersDiv.style.width = "100%";
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this.layersDiv.style.height = "100%";
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var baseLbl = document.createElement("div");
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baseLbl.innerHTML = "<u>Base Layer</u>";
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baseLbl.style.marginTop = "3px";
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baseLbl.style.marginLeft = "3px";
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baseLbl.style.marginBottom = "3px";
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this.layersDiv.appendChild(baseLbl);
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this.baseLayersDiv = document.createElement("div");
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this.baseLayersDiv.style.paddingLeft = "10px";
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Event.observe(this.baseLayersDiv, "click",
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this.onLayerClick.bindAsEventListener(this));
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this.layersDiv.appendChild(this.baseLayersDiv);
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this.dataLbl = document.createElement("div");
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this.dataLbl.innerHTML = "<u>Overlays</u>";
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this.dataLbl.style.marginTop = "3px";
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this.dataLbl.style.marginLeft = "3px";
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this.dataLbl.style.marginBottom = "3px";
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this.layersDiv.appendChild(this.dataLbl);
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this.dataLayersDiv = document.createElement("div");
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this.dataLayersDiv.style.paddingLeft = "10px";
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Event.observe(this.dataLayersDiv, "click",
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this.onLayerClick.bindAsEventListener(this));
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this.layersDiv.appendChild(this.dataLayersDiv);
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this.div.appendChild(this.layersDiv);
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Rico.Corner.round(this.div, {corners: "tl bl",
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bgColor: "transparent",
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color: this.activeColor,
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blend: false});
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Rico.Corner.changeOpacity(this.layersDiv, 0.75);
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var imgLocation = OpenLayers.Util.getImagesLocation();
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var sz = new OpenLayers.Size(18,18);
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// maximize button div
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var img = imgLocation + 'layer-switcher-maximize.png';
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this.maximizeDiv = OpenLayers.Util.createAlphaImageDiv(
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"OpenLayers_Control_MaximizeDiv",
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null,
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sz,
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img,
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"absolute");
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this.maximizeDiv.style.top = "5px";
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this.maximizeDiv.style.right = "0px";
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this.maximizeDiv.style.left = "";
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this.maximizeDiv.style.display = "none";
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Event.observe(this.maximizeDiv,
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"click",
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this.maximizeControl.bindAsEventListener(this));
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this.div.appendChild(this.maximizeDiv);
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// minimize button div
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var img = imgLocation + 'layer-switcher-minimize.png';
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var sz = new OpenLayers.Size(18,18);
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this.minimizeDiv = OpenLayers.Util.createAlphaImageDiv(
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"OpenLayers_Control_MinimizeDiv",
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null,
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sz,
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img,
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"absolute");
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this.minimizeDiv.style.top = "5px";
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this.minimizeDiv.style.right = "0px";
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this.minimizeDiv.style.left = "";
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this.minimizeDiv.style.display = "none";
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Event.observe(this.minimizeDiv,
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"click",
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this.minimizeControl.bindAsEventListener(this));
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this.div.appendChild(this.minimizeDiv);
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},
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/**
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* @private
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*
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* @param {Event} evt
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*/
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ignoreEvent: function(evt) {
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Event.stop(evt);
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},
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/** Register a local 'mouseDown' flag so that we'll know whether or not
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* to ignore a mouseUp event
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*
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* @private
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*
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* @param {Event} evt
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*/
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mouseDown: function(evt) {
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this.mouseDown = true;
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this.ignoreEvent(evt);
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},
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/** If the 'mouseDown' flag has been set, that means that the drag was
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* started from within the LayerSwitcher control, and thus we can
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* ignore the mouseup. Otherwise, let the Event continue.
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*
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* @private
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*
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* @param {Event} evt
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*/
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mouseUp: function(evt) {
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if (this.mouseDown) {
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this.mouseDown = false;
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this.ignoreEvent(evt);
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}
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Control.LayerSwitcher"
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});
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