AppController.m

/*
     File: AppController.m
 Abstract: Application Controller object, and the NSBrowser delegate. An instance of this object is in the MainMenu.xib.
  Version: 1.1
 
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 */
 
 
 
#import "AppController.h"
#import "FileSystemNode.h"
 
// Turn on or off this define to use the new SnowLeopard item-based API
#define USE_ITEM_BASED_API 1
 
@implementation AppController
 
- (void)dealloc {
    [_rootNode release];
    [super dealloc];
}
 
#if USE_ITEM_BASED_API
 
// This method is optional, but makes the code much easier to understand
- (id)rootItemForBrowser:(NSBrowser *)browser {
    if (_rootNode == nil) {
        _rootNode = [[FileSystemNode alloc] initWithURL:[NSURL fileURLWithPath:@"/"]];
    }
    return _rootNode;    
}
 
- (NSInteger)browser:(NSBrowser *)browser numberOfChildrenOfItem:(id)item {
    FileSystemNode *node = (FileSystemNode *)item;
    return node.children.count;
}
 
- (id)browser:(NSBrowser *)browser child:(NSInteger)index ofItem:(id)item {
    FileSystemNode *node = (FileSystemNode *)item;
    return [node.children objectAtIndex:index];
}
 
- (BOOL)browser:(NSBrowser *)browser isLeafItem:(id)item {
    FileSystemNode *node = (FileSystemNode *)item;
    return !node.isDirectory;
}
 
- (id)browser:(NSBrowser *)browser objectValueForItem:(id)item {
    FileSystemNode *node = (FileSystemNode *)item;
    return node.displayName;
}
 
#else
 
// This is a utility method to find the parent item for a given column. The item based API eliminates the need for this method.
- (FileSystemNode *)parentNodeForColumn:(NSInteger)column {
    if (_rootNode == nil) {
        _rootNode = [[FileSystemNode alloc] initWithURL:[NSURL fileURLWithPath:@"/"]];
    }
    
    FileSystemNode *result = _rootNode;
    // Walk up to this column, finding the selected row in the column before it and using that in the children array
    for (NSInteger i = 0; i < column; i++) {
        NSInteger selectedRowInColumn = [_browser selectedRowInColumn:i];
        FileSystemNode *selectedChildNode = [result.children objectAtIndex:selectedRowInColumn];
        result = selectedChildNode;
    }
    
    return result;
}
 
// Non-item based API example. This code will work on all systems, but applications targeting SnowLeopard and higher should use the new item-based API.
 
- (NSInteger)browser:(NSBrowser *)sender numberOfRowsInColumn:(NSInteger)column {
    FileSystemNode *parentNode = [self parentNodeForColumn:column];
    return parentNode.children.count;
}
 
- (void)browser:(NSBrowser *)sender willDisplayCell:(NSBrowserCell *)cell atRow:(NSInteger)row column:(NSInteger)column {
    // Lazily setup the cell's properties in this method
    FileSystemNode *parentNode = [self parentNodeForColumn:column];
    FileSystemNode *childNode = [parentNode.children objectAtIndex:row];
    [cell setTitle:childNode.displayName];
    [cell setLeaf:!childNode.isDirectory];
}
 
#endif
 
@end