[Rubycocoa-talk] OutlineView programatic datasources

[Tim P. <he...@ti...>]

Hey all

Having a slight puzzler here - i wrote a sample for RubyCocoa.com a  
long time ago which demonstrated how to programatically use your own  
data-source for an outline view (link: http://www.rubycocoa.com/files/outline-views/OutlineMeRuby.zip) 
. Thats all fine and dandy, but I am in the situation where I now need  
multiple root nodes and im not quite sure how to get there!

Its been a while since I've done any RC programming so just trying to  
work my way around once again. In that other outline view example, I  
had a single root node defined by @@rootNode, and it is root because  
oh its initial nil value. What I am confused about however is how to  
add another nil value element onto the outline view? I've been looking  
at the DragNDropOutlineView supplied by apple, which I understand, but  
they load there data from dictionary, so its not clear how that  
translates...

Can anyone point me in the right direction to create multiple root  
nodes?

Cheers

Tim

FYI - heres the code for the app controller data-source

require 'osx/cocoa'

class OLDataSource < OSX::NSObject

   include OSX

   # IB outlets
   ib_outlets :outlineView

   # configure root node
   @@rootNode = nil

   # (id)
   def init
     super_init
	  @@rootNode = Node.alloc.init
     @@rootNode.setItemName('Root')

     #newnode = Node.alloc.init
     #newnode.setItemName('Badger')

	  return self
   end

   # (IBAction)
   def addChild(sender)
     selectedRow = @outlineView.selectedRow
	
	# is nothing selected
	if selectedRow < 0
	  NSBeep()
	  return
	end
	
	# which node is that?
	selectedItem = @outlineView.itemAtRow(selectedRow)
	
	# create a new child
	newNode = Node.alloc.init
	newNode.setItemName('New Child')
	selectedItem.addChild(newNode)
	
	#newNode.release
	@outlineView.reloadItem_reloadChildren(@@rootNode, true)
   end

   # datasource mehods for outlineView
   # (id)
   def outlineView_child_ofItem(outlineView, index, item)
	item ? item.childAtIndex(index) : @@rootNode
   end

   # (bool)
   def outlineView_isItemExpandable(outlineView, item)
     return item.expandable
   end

   # (bool)
   def outlineView_numberOfChildrenOfItem(outlineView, item)
     item == nil ? 1 : item.childrenCount()
   end

   # (id)
   def outlineView_objectValueForTableColumn_byItem(outlineView,  
tableColumn, item)
     identifier = tableColumn.identifier
	
	NSLog(identifier.to_s)
	
	if identifier.to_s == "itemSum"
	  return item.sum
	else
	  return item.itemName
	end

   end

   # (void) delegate method
   def outlineView_setObjectValue_forTableColumn_byItem(outlineView,  
object, tableColoumn, item)
     item.setItemName(object)
	outlineView.reloadItem_reloadChildren(@@rootNode, true)
   end

   # (void)
   def dealloc
     @@rootNode = nil
	super_dealloc
   end

end