NSOutlineView problem
NSOutlineView problem
- Subject: NSOutlineView problem
- From: jordibares <email@hidden>
- Date: Wed, 11 Apr 2007 19:17:43 -0300
- Thread-topic: NSOutlineView problem
I am running into a funny behavior with NSOutlineView when adding objects
because does not display in the outline view the child nodes when I do
create these child nodes from a method. When these nodes are created from
the init method then it works.
My code is based on OutlineMe code from Aaron Hillegass example and I have
checked all I can think of...
Basically this works;
----------------------------------------------------------------------------
------------------
> - init
> {
> [super init];
> rootNode = [[OutlineNode alloc] init];
> [rootNode setItemName: @"Root"];
>
> // Local variables
> OutlineNode *newNode;
>
> // Create a new child node
> newNode = [[OutlineNode alloc] init];
> [newNode setItemName:[theComputerNode name]];
>
> // Add the computer node name to the root
> [rootNode addChild:newNode];
>
> // Parent node is retaining the new node
> [newNode release];
>
> // Brute force refresh
> [outlineView reloadItem:rootNode reloadChildren:YES];
>
> return self;
> }
>
>
> - (void)addComputerNode:(Computer *)theComputerNode
> {
> }
----------------------------------------------------------------------------
------------------
But this does not!
----------------------------------------------------------------------------
------------------
> - init
> {
> [super init];
> rootNode = [[OutlineNode alloc] init];
> [rootNode setItemName: @"Root"];
>
> return self;
> }
>
>
> - (void)addComputerNode:(Computer *)theComputerNode
> {
> // Local variables
> OutlineNode *newNode;
>
> // Create a new child node
> newNode = [[OutlineNode alloc] init];
> [newNode setItemName:[theComputerNode name]];
>
> // Add the computer node name to the root
> [rootNode addChild:newNode];
>
> // Parent node is retaining the new node
> [newNode release];
>
> // Brute force refresh
> [outlineView reloadItem:rootNode reloadChildren:YES];
> }
----------------------------------------------------------------------------
------------------
When I log the number of child under root it returns 1 after the addition in
both examples, also I can access these values programatically but in the
outline view these don¹t appear.
Here is the code from the Data Source methods
----------------------------------------------------------------------------
------------------
//
----------------------------------------------------------------------------
------------
> // DATA SOURCE METHODS
> //
> ------------------------------------------------------------------------------
> ----------
> #pragma mark -
> #pragma mark datasource methods
>
> // This method is called repeatedly when the table view is displaying it self.
> - (id)outlineView:(NSOutlineView *)ov
> child:(int)index
> ofItem:(id)item
> {
> // is the parent non-nil? Return the child, Else return the root
> if ( item != nil )
> {
> return [item childAtIndex:index];
> }
> else
> {
> return rootNode;
> }
> }
>
> // Called repeatedly to find out if there should be an "expand triangle" next
> to the label
> - (BOOL)outlineView:(NSOutlineView *)ov
> isItemExpandable:(id)item
> {
> // Returns YES if the node has children
> return [item isExpandable];
> }
>
> // Called repeatedly when the table view is displaying itself
> - (int)outlineView:(NSOutlineView *)ov
> numberOfChildrenOfItem:(id)item
> {
> return (item == nil) ? 1 : [item childrenCount];
> }
>
> // This method gets called repeatedly when the outline view is trying
> // to display it self.
>
> - (id)outlineView:(NSOutlineView *)ov
> objectValueForTableColumn:(NSTableColumn *)tableColumn
> byItem:(id)item
> {
> return [item itemName];
> }
----------------------------------------------------------------------------
------------------
Any pointer would be appreciated, thanks in advance.
Jordi Bares
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