May 2003
Intermediate to advanced
566 pages
27h 29m
English
Content preview from Cocoa in a Nutshell
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Name
NSOutlineViewDataSource — Mac OS X 10.0
Synopsis
Methods in this informal protocol are implemented by classes that
provide the data contents for an NSOutlineView. An
NSOutlineView data source delegate object must
implement the following four required methods of the protocol:
outlineView:child:ofItem:,
outlineView:isItemExpandable:,
outlineView:numberOfChildrenOfItem:,
outlineView:objectValueForTableColumn: byItem:.
In each of these four methods, outlineView: is the
NSOutlineView object invoking the method. Every
outline view has a root item. In the invocation of the data source
methods, an outline view indicates a root item as
nil. Thus, if
outlineView:numberOfChildrenOfItem: was invoked
with nil at the item, the implementation of this
method would return the number of children items for the root item.
@interface NSObject (NSOutlineViewDataSource)
|
// Instance Methods
|
- (id)outlineView:(NSOutlineView *)outlineView child:(int)index ofItem:(id)item; |
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item; |
- (int)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item; |
- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item; |
- (void)outlineView:(NSOutlineView *)outlineView v forTableColumn:(NSTableColumn *)tableColumn byItem:(id)item; |
- (id)outlineView:(NSOutlineView *)outlineView itemForPersistentObject:(id)object; |
- (id)outlineView:(NSOutlineView *)outlineView persistentObjectForItem ... |
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.