[Laszlo-user] List not working with 'tree'

[Chen Ding]

Hi there,

I am having a problem with the class 'tree'. In the code below, I create a list. When an entry in the list is clicked, it creates an instance of 'tree'. But the list clicking does not work properly. For instance, click the first entry, then use the scroll bar to scroll the list to the end of the list and then click the last entry, the list somehow jumps back to the last entry of the shown items before scrolling. Try to select an entry, use the scroll bar to make the selected entry unseen, and then select another entry, you should see the problems.  But note that if I do not scroll the list, everything works perfectly.

If I create a push button instead of a tree node when an entry is clicked, everything works just fine (i.e., uncomment Line 11 and comment out Line 10 in the code below). 

Your help is greatly appreciated!

Chen Ding

  1 <canvas>
  2     <class name="mytree" extends="tree"/>
  3     <class name="mybutton" extends="button"/>
  4 
  5     <view x="500" y="100" width="500" height="300" name="the_view">
  6         <attribute name="widget" type="expression"/>
  7 
  8         <method name="showContents" args="name">
  9             if (this['widget']) this.widget.destroy();
 10             this.widget = new lz.mytree(this, { text : name }, []);
 11             // this.widget = new lz.mybutton(this, { text : name }, []);
 12         </method>
 13     </view>
 14 
 15     <class name="mytextlistitem" extends="textlistitem">
 16         <handler name="onclick">
 17             the_view.showContents(text);
 18         </handler>
 19     </class>
 20 
 21     <view     name="mylist" width="400" height="250">
 22         <handler name="oninit">
 23             this.list_field.createItems();
 24         </handler>
 25 
 26         <list name="list_field"
 27               width="${parent.width}"
 28               x="0"
 29               spacing="2"
 30               shownitems="6"
 31               toggleselected="true"
 32               bgcolor="${iceblue4}">
 33 
 34             <selectionmanager name="selector" toggle="true"/>
 35 
 36             <method name="createItems">
 37                 <![CDATA[
 38                 for (var i=0; i<20; i++)
 39                 {
 40                     var entry = new lz.mytextlistitem(this,
 41                         {
 42                             width : this.width,
 43                             height : 30,
 44                             text : 'Object_' + i
 45                         }, []);
 46                 }
 47                 ]]>
 48             </method>
 49         </list>
 50     </view>
 51 </canvas>


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