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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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<h2>FeatureSelectHandler.js</h2>
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<h4>Summary</h4>
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No overview generated for 'FeatureSelectHandler.js'<BR/><BR/>
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<b>Class Summary</b>
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</tr>
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<tr bgcolor="white" class="TableRowColor">
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<td width="15%"><b><a href="FeatureSelectHandler.html">FeatureSelectHandler</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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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id: FeatureSelectHandler.js 3842 2008-02-13 17:22:04Z ahocevar $
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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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mapbuilder.loadScript(baseDir+<span class="literal">"/util/openlayers/OpenLayers.js"</span>);
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<span class="comment">/**
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* Manages mouseover and clicks on vector features in the map.
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* This tool works with models that are linked to a OL vector layer,
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* using eg. the GmlRendererOL widget. Models have to fire the
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* 'gmlRendererLayer' event, which will activate the tool for the
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* layer.
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* This tool also fires "mouseoverFeature" and "mouseoutFeature"
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* events, setting the fid of the feature below the mouse cursor
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* as param of the model.
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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">@author</span> Andreas Hocevar andreas.hocevarATgmail.com
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* <span class="attrib">@param</span> toolNode The tool node from the config XML file.
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* <span class="attrib">@param</span> model The model containing this tool.
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*/</span>
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<span class="reserved">function</span> FeatureSelectHandler(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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* Map for this FeatureSelectHandler. We keep a reference
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* to the map we created the control for, to prevent ourselves
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* from removing the control from a map that does not exist
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* anymore.
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*/</span>
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<span class="reserved">this</span>.map = null;
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<span class="reserved">this</span>.sourceModels = new Array();
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<span class="comment">/**
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* Tool Initialisation - Step 1 of 3.
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* This is called when the config finished loading, so we know
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* our context (targetModel).
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* <span class="attrib">@param</span> objRef This object
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*/</span>
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<span class="reserved">this</span>.configInit = <span class="reserved">function</span>(objRef) {
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objRef.targetModel.addListener(<span class="literal">'loadModel'</span>, objRef.contextInit, objRef);
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}
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<span class="reserved">this</span>.model.addListener(<span class="literal">'init'</span>, <span class="reserved">this</span>.configInit, <span class="reserved">this</span>)
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<span class="reserved">this</span>.clear = <span class="reserved">function</span>(objRef) {
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<span class="reserved">if</span> (objRef.control) {
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objRef.map = null;
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objRef.control.destroy();
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objRef.control = null;
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}
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}
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<span class="reserved">this</span>.model.addListener(<span class="literal">"newModel"</span>, <span class="reserved">this</span>.clear, <span class="reserved">this</span>);
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<span class="comment">/**
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* Tool Initialisation - Step 2 of 3.
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* This is called when the context model finished loading, so we
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* know that we have a map available.
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* <span class="attrib">@param</span> objRef This object
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*/</span>
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<span class="reserved">this</span>.contextInit = <span class="reserved">function</span>(objRef) {
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objRef.targetModel.addListener(<span class="literal">"newModel"</span>, objRef.clear, objRef);
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objRef.model.addListener(<span class="literal">'gmlRendererLayer'</span>, objRef.init, objRef);
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<span class="comment"> // Check carefully if we have to init manually. This is the case when</span>
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<span class="comment"> // the gmlRendererLayer is rendered, but does not know about the</span>
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<span class="comment"> // FeatureSelectHandler yet.</span>
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<span class="reserved">if</span> (objRef.targetModel.map && objRef.model.getParam(<span class="literal">'gmlRendererLayer'</span>) && !objRef.control) {
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objRef.init(objRef);
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}
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}
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<span class="comment">/**
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* Tool Initialisation - Step 3 of 3.
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* Turns on feature select when the gmlRendererLayer event is fired.
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* <span class="attrib">@param</span> objRef reference to this object.
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* <span class="attrib">@return</span> {OpenLayers.Control} class of the OL control.
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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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<span class="comment"> // get the source models</span>
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var sourceModel;
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<span class="comment"> // if we have mergeModels, take sourceModels from there</span>
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<span class="reserved">if</span> (objRef.model.mergeModels) {
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objRef.sourceModels = objRef.model.mergeModels;
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} <span class="reserved">else</span> {
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<span class="comment"> // if we hava a plain model, just use it</span>
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objRef.sourceModels.push(objRef.model);
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}
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<span class="reserved">for</span> (var i=0; i<objRef.sourceModels.length; i++) {
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objRef.sourceModels[i].addListener(<span class="literal">'highlightFeature'</span>, objRef.highlight, objRef);
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objRef.sourceModels[i].addListener(<span class="literal">'dehighlightFeature'</span>, objRef.dehighlight, objRef);
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}
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<span class="comment">
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// init the control</span>
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var layer = objRef.model.getParam(<span class="literal">'gmlRendererLayer'</span>);
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<span class="reserved">if</span> (objRef.map == objRef.targetModel.map &&
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objRef.control && !layer) {
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<span class="comment"> //objRef.control.deactivate();</span>
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objRef.map.removeControl(objRef.control);
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objRef.control.destroy();
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objRef.control = null;
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} <span class="reserved">else</span> <span class="reserved">if</span> (layer) {
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<span class="reserved">if</span> (!objRef.control) {
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objRef.control = new OpenLayers.Control.SelectFeature(layer, {
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hover: true,
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onSelect: objRef.onSelect,
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onUnselect: objRef.onUnselect,
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mbFeatureSelectHandler: objRef,
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select: <span class="reserved">function</span>(feature) {
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feature.mbFeatureSelectHandler = <span class="reserved">this</span>.mbFeatureSelectHandler;
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<span class="reserved">if</span> (feature.mbSelectStyle) {
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<span class="reserved">this</span>.selectStyle = feature.mbSelectStyle.createSymbolizer ?
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feature.mbSelectStyle.createSymbolizer(feature) :
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feature.mbSelectStyle;
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}
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OpenLayers.Control.SelectFeature.<span class="reserved">prototype</span>.select.apply(<span class="reserved">this</span>, arguments);
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}
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});
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objRef.map = objRef.targetModel.map;
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objRef.map.addControl(objRef.control);
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}
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objRef.control.activate();
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}
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}
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<span class="comment">/**
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* extension for the OpenLayers.Feature.Vector.destroy method.
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* Will be applied to features touched by this tool.
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*/</span>
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var destroyFeature = <span class="reserved">function</span>() {
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var featureSelectHandler = <span class="reserved">this</span>.mbFeatureSelectHandler;
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<span class="reserved">if</span> (<span class="reserved">this</span>.layer.events && featureSelectHandler) {
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<span class="reserved">this</span>.layer.events.unregister(<span class="literal">'mousedown'</span>, <span class="reserved">this</span>, featureSelectHandler.onClick);
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<span class="reserved">this</span>.layer.events.unregister(<span class="literal">'mousemove'</span>, <span class="reserved">this</span>, featureSelectHandler.onHover);
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}
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<span class="reserved">this</span>.mbFeatureSelectHandler = null;
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OpenLayers.Feature.Vector.<span class="reserved">prototype</span>.destroy.apply(<span class="reserved">this</span>, arguments);
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}
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<span class="comment">/**
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* This method is triggered when the mouse is over a vector
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* feature. It registers priority events mousedown and
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* mousemove, which will call this widget's onClick/onHover
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* method in the context of a feature. This way we address
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* two problems with the OpenLayers SelectFeature control:<pre>
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* - for the info popup, we need the screen coordinates
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* which we do not get from the handler directly.
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* - when the active tool changes, something in the
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* priority of OL event handlers changes, so the
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* click event on the feature gets lost. By registering
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* our priority handler and calling Event.stop() in
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* the target method, we make sure that our event is
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* handled and no other event handlers are triggered.
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* </pre>
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* <span class="attrib">@param</span> feature OpenLayers feature
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*/</span>
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<span class="reserved">this</span>.onSelect = <span class="reserved">function</span>(feature) {
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<span class="reserved">if</span> (!feature) <span class="reserved">return</span>;
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var objRef = <span class="reserved">this</span>.mbFeatureSelectHandler;
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<span class="reserved">for</span> (var i=0; i<objRef.sourceModels.length; i++) {
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objRef.sourceModels[i].setParam(<span class="literal">"mouseoverFeature"</span>, feature.fid);
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}
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<span class="comment"> // check if onSelect was triggered by a mouse event. If not, do not register for</span>
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<span class="comment"> // mousedown and mousemove events. This is the case when selection was externally</span>
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<span class="comment"> // triggered by the highlightFeature event</span>
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<span class="reserved">if</span> (feature.layer.events && !feature.mbNoMouseEvent) {
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feature.destroy = destroyFeature;
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feature.layer.events.registerPriority(<span class="literal">'mousedown'</span>, feature, objRef.onClick);
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feature.layer.events.registerPriority(<span class="literal">'mousemove'</span>, feature, objRef.onHover);
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} <span class="reserved">else</span> {
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feature.mbNoMouseEvent = null;
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}
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}
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<span class="comment">/**
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* This method is triggered when the mouse is moving out
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|
* of a vector feature. It removes the event handler we
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* registered in this widget's onSelect method.
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* <span class="attrib">@param</span> feature OpenLayers feature
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*/</span>
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<span class="reserved">this</span>.onUnselect = <span class="reserved">function</span>(feature) {
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<span class="reserved">if</span> (!feature) <span class="reserved">return</span>;
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var objRef = <span class="reserved">this</span>.mbFeatureSelectHandler || feature.mbFeatureSelectHandler;
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<span class="reserved">for</span> (var i=0; i<objRef.sourceModels.length; i++) {
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objRef.sourceModels[i].setParam(<span class="literal">"mouseoutFeature"</span>, feature.fid);
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}
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objRef.model.setParam(<span class="literal">"olFeatureOut"</span>, feature);
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<span class="reserved">if</span> (feature.layer.events) {
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feature.layer.events.unregister(<span class="literal">'mousedown'</span>, feature, objRef.onClick);
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}
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}
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<span class="comment">/**
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|
* This method is triggered when a user clicks on a feature.
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|
* It is called by OpenLayers event handling in the context
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* of a feature. This means that 'this' in this method refers
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* to an {OpenLayers.Feature}. Widgets listening to the
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* olFeatureSelect have access to the event, because setParam
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|
* is used to set the reference to the event.
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* <span class="attrib">@param</span> evt OpenLayers event
|
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|
*/</span>
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|
<span class="reserved">this</span>.onClick = <span class="reserved">function</span>(evt) {
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<span class="comment"> // pass the feature to the event object</span>
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|
evt.feature = <span class="reserved">this</span>;
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|
var objRef = <span class="reserved">this</span>.mbFeatureSelectHandler;
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objRef.model.setParam(<span class="literal">"olFeatureSelect"</span>, evt);
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OpenLayers.Event.stop(evt);
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}
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<span class="comment">/**
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* This method is triggered when the mouse is over a feature.
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* It is called by OpenLayers event handling in the context
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* of a feature. This means that 'this' in this method refers
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* to an {OpenLayers.Feature}. Widgets listening to the
|
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|
* olFeatureHover have access to the event, because setParam
|
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* is used to set the reference to the event.
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* <span class="attrib">@param</span> evt OpenLayers event
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*/</span>
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<span class="reserved">this</span>.onHover = <span class="reserved">function</span>(evt) {
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var objRef = <span class="reserved">this</span>.mbFeatureSelectHandler;
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<span class="reserved">if</span> (<span class="reserved">this</span>.layer && <span class="reserved">this</span>.layer.events) {
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<span class="comment"> // unregister the mousemove event, because we already know that</span>
|
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<span class="comment"> // the mouse moved and we can then proceed to our hover popup.</span>
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<span class="reserved">this</span>.layer.events.unregister(<span class="literal">'mousemove'</span>, <span class="reserved">this</span>, objRef.onHover);
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}
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evt.feature = <span class="reserved">this</span>;
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objRef.model.setParam(<span class="literal">"olFeatureHover"</span>, evt);
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}
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342
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<span class="comment">/**
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* Highlights the specified feature. This method is usually
|
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* triggered by setting the 'highlightFeature' param to the
|
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* fid of a feature to be highlighted.
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* <span class="attrib">@param</span> objRef reference to this tool object
|
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* <span class="attrib">@param</span> fid GML feature id of the feature to highlight. If
|
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* not specified, this is taken from the highlightFeature
|
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* model param.
|
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*/</span>
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<span class="reserved">this</span>.highlight = <span class="reserved">function</span>(objRef, fid) {
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var model, feature;
|
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353
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var layer = objRef.model.getParam(<span class="literal">'gmlRendererLayer'</span>);
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<span class="reserved">for</span> (var i=0; i<objRef.sourceModels.length; i++) {
|
|
355
|
model = objRef.sourceModels[i]
|
|
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|
<span class="reserved">if</span> (!layer) <span class="reserved">return</span>;
|
|
357
|
<span class="reserved">if</span> (!fid) {
|
|
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|
fid = model.getParam(<span class="literal">'highlightFeature'</span>);
|
|
359
|
}
|
|
360
|
feature = layer.getFeatureByFid(fid);
|
|
361
|
<span class="reserved">if</span> (feature && !feature.mbHidden) {
|
|
362
|
<span class="comment"> // add a tag to the feature to indicate that it was not selected by mouse action</span>
|
|
363
|
feature.mbNoMouseEvent = true;
|
|
364
|
objRef.control.select(feature);
|
|
365
|
}
|
|
366
|
}
|
|
367
|
}
|
|
368
|
|
|
369
|
<span class="comment">/**
|
|
370
|
* Dehighlights the specified feature. This method is usually
|
|
371
|
* triggered by setting the 'dehighlightFeature' param to the
|
|
372
|
* fid of a feature to be highlighted.
|
|
373
|
* <span class="attrib">@param</span> objRef reference to this tool object
|
|
374
|
* <span class="attrib">@param</span> fid GML feature id of the feature to highlight. If
|
|
375
|
* not specified, this is taken from the dehighlightFeature
|
|
376
|
* model param.
|
|
377
|
*/</span>
|
|
378
|
<span class="reserved">this</span>.dehighlight = <span class="reserved">function</span>(objRef, fid) {
|
|
379
|
var model, feature;
|
|
380
|
var layer = objRef.model.getParam(<span class="literal">'gmlRendererLayer'</span>);
|
|
381
|
<span class="reserved">for</span> (var i=0; i<objRef.sourceModels.length; i++) {
|
|
382
|
model = objRef.sourceModels[i];
|
|
383
|
<span class="reserved">if</span> (!layer) <span class="reserved">return</span>;
|
|
384
|
<span class="reserved">if</span> (!fid) {
|
|
385
|
fid = objRef.model.getParam(<span class="literal">'dehighlightFeature'</span>);
|
|
386
|
}
|
|
387
|
feature = layer.getFeatureByFid(fid);
|
|
388
|
<span class="reserved">if</span> (feature && !feature.mbHidden) {
|
|
389
|
objRef.control.unselect(feature);
|
|
390
|
}
|
|
391
|
}
|
|
392
|
}
|
|
393
|
|
|
394
|
}
|
|
395
|
</pre>
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422
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