View-Based NSOutlineView Example

gistfile1.m

//
//  AppDelegate.m
//  sourceList
//
//  Created by Dr.Kameleon on 9/14/14.
//  Copyright (c) 2014 InSili.co. All rights reserved.
//

#import "AppDelegate.h"

/******************************************************************************
 *
 * NSOutlineView Extension
 *
 ******************************************************************************/

@interface NSOutlineView (ContextMenu)
@end

@interface NSObject (NSOutlineViewContextMenuDelegate)
- (NSMenu *)outlineView:(NSOutlineView *)outlineView contextMenuForItem:(id)item;
@end

@implementation NSOutlineView (ContextMenu)

- (NSMenu *)menuForEvent:(NSEvent *)theEvent
{
	int rowIndex = (int)[self rowAtPoint:[self convertPoint:[theEvent locationInWindow] fromView:nil]];
    
	if (rowIndex >= 0)
	{
		[self abortEditing];
		id item = [self itemAtRow:rowIndex];
		if (item)
		{
			id obj = [self delegate];
			if ([obj respondsToSelector:@selector(outlineView:shouldSelectItem:)] &&
				[obj outlineView:self shouldSelectItem:item])
			{
				[self selectRowIndexes:[NSIndexSet indexSetWithIndex:rowIndex] byExtendingSelection:NO];
			}
            
			if ([obj respondsToSelector:@selector(outlineView:contextMenuForItem:)])
			{
				return [obj outlineView:self contextMenuForItem:item];
			}
		}
	}
	else // click in no man's land
	{
		[self deselectAll:self];
		return [self menu];
	}
	return nil;
}

@end

/******************************************************************************
 *
 * Main Part
 *
 ******************************************************************************/

@implementation AppDelegate

/*********************************
 Helpers
 *********************************/

#define HAS_KEY(X,Y) ([self dictionary:(X) containsKey:(Y)])

- (BOOL)dictionary:(NSDictionary*)dict containsKey: (NSString *)key {
    BOOL retVal = 0;
    NSArray *allKeys = [dict allKeys];
    retVal = [allKeys containsObject:key];
    return retVal;
}

/*********************************
 Setup
 *********************************/

- (void)awakeFromNib
{
    // Setup Delegate/Datasource
    
    [_fileView setDataSource:(id<NSOutlineViewDataSource>)self];
    [_fileView setDelegate:(id<NSOutlineViewDelegate>)self];
    [_fileView setMenu:_rightClickMenu];
    
    // Set some sample tree data
    
    _fileTree =
    @[
        @{ @"label": @"FILES", @"isGroup": @YES, @"children":@[
             @{ @"label": @"one"},
             @{ @"label": @"two", @"children": @[
                  @{@"label":@"two.1"},
                  @{@"label":@"two.2"}
             ]}
        ]},
        @{ @"label": @"HTML", @"isGroup": @YES, @"children":@[
             @{ @"label": @"one"},
             @{ @"label": @"two", @"children": @[
                  @{@"label":@"two.1", @"children":@[
                        @{ @"label": @"two.1.1"},
                        @{ @"label": @"two.1.2"}
                  ]},
                  @{@"label":@"two.2"}
             ]}
        ]},
    ];
    
    // Update view
    
    [_fileView sizeLastColumnToFit];
    [_fileView setFloatsGroupRows:NO];
    [_fileView reloadData];
}

/*********************************
 NSOutlineView
 *********************************/

//--------------------------
// Generic Setup
//--------------------------

- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item
{
    if (HAS_KEY(item,@"children")) return YES;
    else return NO;
}

- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item
{
    if (item==nil) return [_fileTree count]; // Root
    else if (HAS_KEY(item,@"children")) return [item[@"children"] count];
    else return 0;
}

- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item
{
    if (item == nil) return _fileTree[index]; // Root
    else if (HAS_KEY(item,@"children")) return item[@"children"][index];
    else return nil;
}

- (BOOL)outlineView:(NSOutlineView *)outlineView isGroupItem:(id)item
{
    if (HAS_KEY(item, @"isGroup")) return YES;
    else return NO;
}

- (BOOL)outlineView:(NSOutlineView *)outlineView shouldSelectItem:(id)item
{
    if ([self outlineView:outlineView isGroupItem:item]) return NO;
    else return YES;
}

//--------------------------
// Set Content & Icons
//--------------------------

- (NSView *)outlineView:(NSOutlineView *)outlineView viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item
{
    NSTableCellView* tcv;
    
    if ([self outlineView:outlineView isGroupItem:item]) {
        tcv = [outlineView makeViewWithIdentifier:@"HeaderCell" owner:self];
        tcv.textField.stringValue = item[@"label"];
    }
    else
    {
        tcv = [outlineView makeViewWithIdentifier:@"DataCell" owner:self];
        tcv.textField.stringValue = item[@"label"];
        
        NSImage* cellImage;
        
        if (HAS_KEY(item,@"children")) cellImage = [[NSWorkspace sharedWorkspace] iconForFileType:NSFileTypeForHFSTypeCode(kGenericFolderIcon)];
        else cellImage = [[NSWorkspace sharedWorkspace] iconForFileType:NSFileTypeRegular];
        
        [cellImage setSize:NSMakeSize(15.0, 15.0)];
        
        tcv.imageView.image = cellImage;
    }
    
    return tcv;
}

//--------------------------
// Selection tracking
//--------------------------

- (void)outlineViewSelectionDidChange:(NSNotification *)notification {
    if ([_fileView selectedRow] != -1) {
        id item = [_fileView itemAtRow:[_fileView selectedRow]];
        
        NSLog(@"Selected item : %@",item);
    }
}

//--------------------------
// Right-click menu
//--------------------------

- (NSMenu*)outlineView:(NSOutlineView*)outlineView contextMenuForItem:(id)item {
    // Show menu depending on item being right-clicked
    return nil;
}

@end