viewspoolmanager.lzx

<library>
    <!--- @keyword private 
    Manage a hash table of viewspool 
    -->
    <class name="viewspoolmanager">
        <attribute name="pools"/>
        <!-- return a views pool -->
        <method name="getPool" args="parent, className">            
            if(this.pools == null)
            {   
                this.pools = new Object();             
                parent["_pools"] = this.pools;
            }
            
            var pool = this.pools[className];
            if(!pool)
            {
                pool =  new lz.viewspool(parent); 
                //debug.write(pool);
                pool.parentview = parent;  
                pool.viewclass = className;
                this.pools[className] = pool;                                                                                
            }
            return pool;           
        </method>
       
        <!-- put are the view back to the pools -->         
        <method name="reclaimAll">
                     
             for( var k in this.pools)
             {                
                this.pools[k].reclaimAll();
             }
        
        </method>        
    </class>
    
    <!--- @keyword private
     Represents a pool of view -->
    <class name="viewspool" extends="node">             
        <attribute name="unused" value="$once{[]}"/>
        <attribute name="used" value="$once{[]}"/>
        <attribute name="parentview" value="$once{null}"/>
        <attribute name="viewclass" type="string" value="$once{null}"/>
        
        <!-- get a view the pool -->
        <method name="getView" args="args">
            var marker = null;
            if(this.unused.length > 0)
            {
                marker = this.unused.pop();                 
            }
            else
            {
                marker =  new lz[viewclass](parentview, args);                               
            }
            this.used.push(marker);
            marker.setAttribute('visible', true);
            return marker;            
        </method>
        
        <!-- return all the view to the pool -->
        <method name="reclaimAll">
        
             for(var i = 0; i < this.used.length; i++)
             {
                this.used[i].setAttribute('visible', false);
                
                if(this.used[i]["clear"] != null)
                {
                    this.used[i].clear();
                }
             }
             this.unused = this.unused.concat(this.used);
             this.used = [];
        
        </method>
    </class> 
  
    <!--- @keyword private  
        Manage a hash table of viewslist 
     -->
    <class name="viewlistmanager">
        <attribute name="pools" value="${new Object()}"/>
        <!-- return a views pool -->
        <method name="getList" args="parent, className, id">            

            if(this["pools"] == null)
            {   
                this.pools = new Object();             
            }
            
            var listName = className;
            if(id != null)
            {
                listName += id;                
            }
            
            var pool = this.pools[listName];
            if(!pool)
            {
                pool =  new lz.viewslist(parent);                 
                pool.parentview = parent;  
                pool.viewclass = className;
                this.pools[listName] = pool;                                                                                
            }
            return pool;           
        </method>
       
        <!-- put are the view back to the pools -->         
        <method name="reclaimAll">
                     
             for( var k in this.pools)
             {                
                this.pools[k].reclaimAll();
             }
        
        </method>        
    </class>  
    
     <!--- A pool of ordered view  
         - @keyword private
        -->
    <class name="viewslist" extends="node">             
        <attribute name="vlist" value="$once{[]}"/>
        <attribute name="parentview" value="${parent}"/>
        <attribute name="viewclass" type="string" value="$once{null}"/>
        
        <!-- get a view the pool -->
        <method name="getViewAt" args="index, args">            
            if(this.vlist[index] == null)
            {
                this.vlist[index] = new lz[viewclass](parentview, args);                 
            }
            else
            {
                this.vlist[index].setAttribute('visible', true);
            }
            return this.vlist[index];            
        </method>   
        
        <!-- put are the view back to the pools -->         
        <method name="reclaimAll">
                     
             for(var i = 0; i < vlist.length; i++)
             {                
                 if(vlist[i] != undefined){
                    vlist[i].setAttribute('visible', false);
                    //vlist[i].clear();
                }
             }
        
        </method>            
    </class>  
</library>
<!-- * X_LZ_COPYRIGHT_BEGIN 
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* Copyright 2001-2008 Laszlo Systems, Inc.  All Rights Reserved.              
* Use is subject to license terms.                                            
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<!-- @LZX_VERSION@ -->