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<a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008 Overview
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<b><a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008</b></em>
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<center>
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<h2>History.js</h2>
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<h4>Summary</h4>
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No overview generated for 'History.js'<BR/><BR/>
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<td colspan=2><font size="+2">
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<b>Class Summary</b>
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</font></td>
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</tr>
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<tr bgcolor="white" class="TableRowColor">
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<td width="15%"><b><a href="History.html">History</a></b></td>
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<td> </td>
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</table>
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<hr/>
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<!-- ========== METHOD SUMMARY =========== -->
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<!-- ========== END METHOD SUMMARY =========== -->
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<pre class="sourceview"><span class="comment">/*
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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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*/</span>
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<span class="comment">
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// Ensure this object's dependancies are loaded.</span>
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mapbuilder.loadScript(baseDir+<span class="literal">"/tool/ToolBase.js"</span>);
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<span class="comment">/**
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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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* <span class="attrib">@constructor</span>
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* <span class="attrib">@base</span> ToolBase
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* <span class="attrib">@param</span> toolNode The node for this tool from the configuration document.
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* <span class="attrib">@param</span> model The model object that contains this tool
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*/</span>
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<span class="reserved">function</span> History(toolNode, model) {
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ToolBase.apply(<span class="reserved">this</span>, new Array(toolNode, model));
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<span class="comment">/**
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* Inititialising the history and setting start parameters
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* <span class="attrib">@param</span> objRef pointer to this object.
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*/</span>
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<span class="reserved">this</span>.init = <span class="reserved">function</span>(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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<span class="comment">/**
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* This adds the current extent to the historyList
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* <span class="attrib">@param</span> objRef pointer to this object.
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*/</span>
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<span class="reserved">this</span>.add = <span class="reserved">function</span>(objRef) {
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<span class="reserved">if</span> (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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<span class="comment"> // take the current scale -1, otherwise we get troubles when</span>
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<span class="comment"> // fixed scales are defined</span>
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var scale = objRef.targetModel.map.getScale()-1;
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<span class="reserved">if</span> (place > -1) {
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<span class="comment"> // check if current and previous history entry would result</span>
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<span class="comment"> // in same center point and zoom level. If this is the case,</span>
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<span class="comment"> // we do not want a new entry in the list</span>
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<span class="reserved">if</span> (center.toString() == list[place].center.toString() &&
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scale == list[place].scale) {
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<span class="reserved">return</span>;
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}
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}
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var newExtent = new Object({center:center, scale:scale});
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<span class="reserved">if</span>( 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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<span class="reserved">else</span> { //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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<span class="comment">/**
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* This returns the previous extent in the list
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* <span class="attrib">@param</span> objRef pointer to this object.
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*/</span>
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<span class="reserved">this</span>.back = <span class="reserved">function</span>(objRef){
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var place = objRef.model.active;
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<span class="reserved">if</span>(place<1) {
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objRef.model.previousExtent = null;
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alert(mbGetMessage(<span class="literal">"cantGoBack"</span>));
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}
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<span class="reserved">else</span> {
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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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<span class="comment">/**
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* This returns the next extent in the list
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* <span class="attrib">@param</span> objRef pointer to this object.
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*/</span>
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<span class="reserved">this</span>.forward = <span class="reserved">function</span>(objRef) {
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var place = objRef.model.active;
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<span class="reserved">if</span>(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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<span class="reserved">else</span> {
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objRef.model.nextExtent = null;
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alert(mbGetMessage(<span class="literal">"cantGoForward"</span>));
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}
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}
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<span class="comment">/**
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* This stops the listener, to prevent the undo/redo steps to appear in the list
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* <span class="attrib">@param</span> objRef pointer to this object.
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*/</span>
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<span class="reserved">this</span>.stop = <span class="reserved">function</span>(objRef) {
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objRef.model.removeListener(<span class="literal">"bbox"</span>,objRef.add, objRef);
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}
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<span class="comment">/**
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* This restarts the listener after undo/redo is done.
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* <span class="attrib">@param</span> objRef pointer to this object.
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*/</span>
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<span class="reserved">this</span>.start = <span class="reserved">function</span>(objRef) {
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objRef.model.addListener(<span class="literal">"bbox"</span>,objRef.add, objRef);
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}
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<span class="comment">/**
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* Set the loadModel listener in response to the init event
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* <span class="attrib">@param</span> objRef pointer to this object.
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*/</span>
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<span class="reserved">this</span>.initReset = <span class="reserved">function</span>(objRef) {
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objRef.targetModel.addListener(<span class="literal">"bbox"</span>, objRef.add, objRef);
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objRef.targetModel.addListener(<span class="literal">"loadModel"</span>, objRef.init, objRef);
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}
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<span class="reserved">this</span>.model.addListener(<span class="literal">"historyBack"</span>, <span class="reserved">this</span>.back, <span class="reserved">this</span>);
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<span class="reserved">this</span>.model.addListener(<span class="literal">"historyForward"</span>, <span class="reserved">this</span>.forward, <span class="reserved">this</span>);
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<span class="reserved">this</span>.model.addListener(<span class="literal">"historyStart"</span>, <span class="reserved">this</span>.start, <span class="reserved">this</span>);
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<span class="reserved">this</span>.model.addListener(<span class="literal">"historyStop"</span>, <span class="reserved">this</span>.stop, <span class="reserved">this</span>);
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<span class="reserved">this</span>.model.addListener(<span class="literal">"init"</span>, <span class="reserved">this</span>.initReset, <span class="reserved">this</span>);
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}</pre>
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<b><a href='http://mapbuilder.sourceforge.net'>Community Map Builder</a> 27 Apr 2008</b></em>
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<div class="jsdoc_ctime">Documentation generated by <a href="http://jsdoc.sourceforge.net/" target="_parent">JSDoc</a> on Sun Apr 27 20:30:54 2008</div>
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