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/*
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Author: Steven Ottens AT geodan.nl
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id: History.js 2956 2007-07-09 12:17:52Z steven $
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*/
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// Ensure this object's dependancies are loaded.
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mapbuilder.loadScript(baseDir+"/tool/ToolBase.js");
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/**
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* A tool designed to store the history of the extent during a session
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*
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* @constructor
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* @base ToolBase
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* @param toolNode The node for this tool from the configuration document.
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* @param model The model object that contains this tool
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*/
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function History(toolNode, model) {
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ToolBase.apply(this, new Array(toolNode, model));
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/**
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* Inititialising the history and setting start parameters
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* @param objRef pointer to this object.
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*/
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this.init = function(objRef) {
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objRef.model.active = -1;
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objRef.model.historyList = new Array();
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objRef.add(objRef);
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}
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/**
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* This adds the current extent to the historyList
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* @param objRef pointer to this object.
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*/
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this.add = function(objRef) {
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if (objRef.model.active!=null) {
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var place = objRef.model.active;
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var list = objRef.model.historyList;
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var center = objRef.targetModel.map.getExtent().getCenterLonLat();
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// take the current scale -1, otherwise we get troubles when
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// fixed scales are defined
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var scale = objRef.targetModel.map.getScale()-1;
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if (place > -1) {
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// check if current and previous history entry would result
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// in same center point and zoom level. If this is the case,
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// we do not want a new entry in the list
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if (center.toString() == list[place].center.toString() &&
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scale == list[place].scale) {
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return;
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}
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}
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var newExtent = new Object({center:center, scale:scale});
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if( place==(list.length-1)) { //If we are already at the end of the list add a new item
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list.push(newExtent);
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place = place+1;
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}
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else { //If we are somewhere in the middle of the list clear the rest of the list and add a new item
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place = place+1;
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list = list.slice(0,place);
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list.push(newExtent);
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}
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objRef.model.active = place;
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objRef.model.historyList = list;
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}
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}
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/**
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* This returns the previous extent in the list
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* @param objRef pointer to this object.
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*/
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this.back = function(objRef){
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var place = objRef.model.active;
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if(place<1) {
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objRef.model.previousExtent = null;
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alert(mbGetMessage("cantGoBack"));
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}
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else {
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place = place -1;
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objRef.model.active = place;
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objRef.model.previousExtent = objRef.model.historyList[place];
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}
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}
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/**
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* This returns the next extent in the list
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* @param objRef pointer to this object.
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*/
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this.forward = function(objRef) {
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var place = objRef.model.active;
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if(place<(objRef.model.historyList.length-1)) {
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place = place +1;
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objRef.model.active = place;
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objRef.model.nextExtent = objRef.model.historyList[place];
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}
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else {
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objRef.model.nextExtent = null;
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alert(mbGetMessage("cantGoForward"));
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}
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}
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/**
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* This stops the listener, to prevent the undo/redo steps to appear in the list
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* @param objRef pointer to this object.
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*/
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this.stop = function(objRef) {
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objRef.model.removeListener("bbox",objRef.add, objRef);
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}
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/**
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* This restarts the listener after undo/redo is done.
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* @param objRef pointer to this object.
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*/
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this.start = function(objRef) {
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objRef.model.addListener("bbox",objRef.add, objRef);
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}
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/**
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* Set the loadModel listener in response to the init event
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* @param objRef pointer to this object.
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*/
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this.initReset = function(objRef) {
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objRef.targetModel.addListener("bbox", objRef.add, objRef);
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objRef.targetModel.addListener("loadModel", objRef.init, objRef);
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}
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this.model.addListener("historyBack", this.back, this);
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this.model.addListener("historyForward", this.forward, this);
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this.model.addListener("historyStart", this.start, this);
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this.model.addListener("historyStop", this.stop, this);
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this.model.addListener("init", this.initReset, this);
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}
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