[IDCS3] Asserts during tree node creation

Question

I'm porting a plug-in from CS2 to CS3 and am in the middle of converting a list box widget displayed on a dialog to a tree view, using the WListBoxComposite SDK sample and SDK docs as a guide. I'm getting the message:<br /><br />b CreateObject- ReadWrite for impl kTreeNodeControlViewImpl in class kTreeNodeWidgetBoss read wrong amount in plugin <my plugin ID><br /><br />during RegisterStyleWidget in my widget manager implementation, and <br /><br />b ASSERT 'fUTF16BufferLength >= fNumChars'<br /><br />once the dialog is displayed. If I change my tree view adapter to report zero list items then things work fine. I'm assuming this is due to a problem with the resource definition in my .fr, but I haven't been able to spot anything wrong. Are there other places I should be looking at for the source of these errors?<br /><br />For reference, my node widget is defined as:<br /><pre><br />type MyTreeNodeWidget(kViewRsrcType) : <br />ErasablePrimaryResourcePanelWidget(ClassID = kTreeNodeWidgetBoss){};<br /><br />resource MyTreeNodeWidget(kMyTreeNodeRsrcID + index_enUS)<br />{<br />    __FILE__, __LINE__,         <br />    kMyTreeNodeWidgetID, //Widget ID<br />    kPMRsrcID_None,             //Resource ID<br />    kBindLeft | kBindRight,<br />    Frame(0,0,200,20),<br />    kTrue, kTrue,               //Visible, Enabled<br />    kTrue,                      //Erase before draw<br />    kInterfacePaletteFill,      //Color to erase to<br />    "",<br />    {<br />        InfoStaticTextWidget<br />        (<br />            kMyTreeNodeNameWidgetID,            <br />            kSysStaticTextPMRsrcId,<br />            kBindNone,<br />            Frame(2,0,Width, Height),<br />            kTrue, kTrue,                                   <br />            kAlignLeft,                                     <br />            kDontEllipsize,<br />            "",<br />            0,<br />            kPaletteWindowSystemScriptFontId, <br />            kPaletteWindowSystemScriptHiliteFontId,<br />        ),<br />    }       <br />};<br /><br /></pre>

Answer 1

ErasablePrimaryResourcePanelWidget is wrong, use StandardTreeNodeWidget for kTreeNodeWidgetBoss. The ControlView implementation on StandardTreeNodeWidget (kTreeNodeControlViewImpl) expects the CControlView values without erase and color values.
Do your erase outside, in the actual tree view.
Dirk