MAC Tree 实现的方法(NSOutlineView) 2 (实现了简单的选择和动态修改不同的数据）

在MAC Tree 实现的方法(NSOutlineView) 1 的基础上增加如下

协议增加为：

<NSApplicationDelegate,
NSOutlineViewDelegate, NSOutlineViewDataSource,
NSMenuDelegate>

需要注意的事情是：控件的Delegate需要和类绑定，之前我们已经绑定了DataSource，都绑定同一个类

主要是为了实现选择功能：

// 这个函数必须让控件的数据Delegate和此类绑定（即不光控件的数据源和该类绑定，还要将控件Delegate和该类绑定，才会响应这个函数）

- (void)outlineViewSelectionDidChange:(NSNotification *)notification

{

if ([_outline_view_1
selectedRow] != -1)

{

NSString *item = [_outline_view_1
itemAtRow:[_outline_view_1
selectedRow]];

_Lable1.stringValue=item;

}

}

以下是实现代码

H文件

//  TreeGroup_DS.h
//  Created by DMD on 24/9/14.

#import <Foundation/Foundation.h>

@interface TreeGroup_DS : NSObject <NSApplicationDelegate, NSOutlineViewDelegate, NSOutlineViewDataSource, NSMenuDelegate>
{
    //For NSoutlineView Level 1 Items
    NSArray *_topLevelItems;

    //For NSoutlineView child items
    NSMutableDictionary *_childrenDictionary;

    // Control NSOutlineView
    IBOutlet NSOutlineView *_outline_view_1;

    IBOutlet NSTextField *_Lable1;
}
@end

M文件

//
//  TreeGroup_DS.m
//  Created by DMD on 24/9/14.

//1. 实现动态的方法刷新，更新Tree里面的数据（UNDONE）

#import "TreeGroup_DS.h"

@implementation TreeGroup_DS

- (id)init
{
    if ((self = [super init]))
    {
        [self tree_refresh:20 RootName:@"Teacher Liu(3)"];

    }
    return self;
}
- (void)loadView
{

}
- (IBAction)OnClick_BT_Refresh:(id)sender
{
   [self tree_refresh:3 RootName:@"Teacher Liu(3)"];
}

- (IBAction)OnClick_BT_Refresh2:(id)sender
{
    [self tree_refresh:5  RootName:@"Teacher Zhang(5)"];
}

-(void) get_tree_data:(NSInteger)tree_count RootName:(NSString*)item_name
{
    // Group Names
    _topLevelItems = [[NSArray arrayWithObjects:item_name,nil] retain];
    _childrenDictionary = [NSMutableDictionary new];

    // Child Names of group
    NSMutableArray *array = [NSMutableArray arrayWithObjects:nil];
    NSString *child_name=nil;
    for (int i=0; i<tree_count; i++)
    {
        child_name = [NSString stringWithFormat:@"Grade(%d)",i+1];
        [array addObject:child_name];
    }
    [_childrenDictionary setObject:array forKey:item_name];
    NSLog(@"dictionary:%@",_childrenDictionary);
}

-(void) tree_refresh:(NSInteger)tree_count RootName:(NSString*)item_name
{
    [self get_tree_data:tree_count RootName:item_name];

    [_outline_view_1 sizeLastColumnToFit];
    [_outline_view_1 reloadData];
    [_outline_view_1 setFloatsGroupRows:YES];
    [_outline_view_1 setRowSizeStyle:NSTableViewRowSizeStyleDefault];

    // Expand all the root items; disable the expansion animation that normally happens
    [NSAnimationContext beginGrouping];
    [[NSAnimationContext currentContext] setDuration:0];
    [_outline_view_1 expandItem:nil expandChildren:YES];
    [NSAnimationContext endGrouping];
}

- (void)dealloc
{
    [_topLevelItems release];
    [_childrenDictionary release];
    [super dealloc];
}

// Must be function
- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item
{
    return [[self _childrenForItem:item] objectAtIndex:index];
}

- (NSArray *)_childrenForItem:(id)item
{
    NSArray *children;
    if (item == nil)
    {
        children = _topLevelItems;
    }
    else
    {
        children = [_childrenDictionary objectForKey:item];
    }
    return children;
}

// Must be function
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item
{
    if ([outlineView parentForItem:item] == nil)
    {
        return YES;
    }
    else
    {
        return NO;
    }
}

// Must be function
- (NSInteger) outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item
{
    return [[self _childrenForItem:item] count];
}

// Must be to show item name
- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item
{
    id objectValue = nil;
    objectValue = item;
    return objectValue;
}

// 这个函数必须让控件的数据Delegate和此类绑定（即不光控件的数据源和该类绑定，还要将控件Delegate和该类绑定，才会响应这个函数）
- (void)outlineViewSelectionDidChange:(NSNotification *)notification
{
    if ([_outline_view_1 selectedRow] != -1)
    {
        NSString *item = [_outline_view_1 itemAtRow:[_outline_view_1 selectedRow]];
        _Lable1.stringValue=item;
    }
}

@end

实现结果：

点Refresh1时，会显示一些数据

点Refresh2时，会显示another数据

如图：

测试成功！

以上可以满足：当操作的时候，不需要小图片，然后数据增加删除是通过全部刷新来实现完成。

2014-9-24 总结 BY DMD