展开项目时NSOutlineView行索引更改 [英] NSOutlineView row indexes changes when expanding item
问题描述
说我有一个NSTableView(例如, a
)和一个NSOutlineView(例如, b
)。
在 a
的数据源中,我试图获取所有选定项目的父项 b
。在行号。 rowIndex
of a 我想让
rowIndex
th b
和的选定项目,我想将此字符串连接到此项目的父项的名称。例如, a
:
- 1和1.1
- 2
和 b
:
- 1
- 1.1(已选择)
- 2(已选择)
- 3
- (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex
of a
。 NSUInteger index = [[outlineView selectedRowIndexes] firstIndex];
for(NSUInteger i = 0,target = rowIndex; i< target; i ++)
index = [[outlineView selectedRowIndexes] indexGreaterThanIndex:index];
NSLog(@%@,[outlineView [outlineView itemAtRow:index]]);
if([outlineView parentForItem:[outlineView itemAtRow:index]]!= NULL){
return [NSString stringWithFormat:@%@%@,[outlineView parentForItem:[outlineView itemAtRow :index]],[outlineView itemAtRow:index]];
} else {
return [outlineView itemAtRow:index];
}
return NULL;
问题是当我展开一个项目 [outlineView parentForItem:[outlineView itemAtRow:index]]
总是返回最后一个展开的项目。
我想要一个选定的项目及其父母的列表。当我展开一个项目时,所有项目都将其父项更改为最后扩展项
。
我做错了什么?
提前感谢。
一个简单的整数来表示嵌套数据集中的索引,正如你所发现的。相反,您需要使用 NSIndexPath 。如文档所示:
NSIndexPath类表示
树中特定节点的
路径嵌套数组集合。此路径是
,称为索引路径。
Say I have a NSTableView (for example, a
) and a NSOutlineView (for example, b
).
In the datasource of a
I'm trying to get the parent item of all the selected items of b
. In the row no. rowIndex
of a
I would like to have the rowIndex
th selected item of b
and I would like to concatenate this string to the name of the parent of this item. For example, a
:
- 1 and 1.1
- 2
And b
:
- 1
- 1.1 (selected)
- 2 (selected)
- 3
This is - (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(NSInteger)rowIndex
of a
.
NSUInteger index = [[outlineView selectedRowIndexes] firstIndex];
for (NSUInteger i = 0, target = rowIndex; i < target; i++)
index = [[outlineView selectedRowIndexes] indexGreaterThanIndex:index];
NSLog(@"%@", [outlineView [outlineView itemAtRow:index]]);
if([outlineView parentForItem:[outlineView itemAtRow:index]] != NULL) {
return [NSString stringWithFormat:@"%@ %@", [outlineView parentForItem:[outlineView itemAtRow:index]], [outlineView itemAtRow:index]];
} else {
return [outlineView itemAtRow:index];
}
return NULL;
The problem is that when I expand an item [outlineView parentForItem:[outlineView itemAtRow:index]]
returns always the last expanded item.
I am trying to have a list of selected items and their parents. When I expand an item, all items change their parent to last expanded item
.
Am I doing something wrong?
Thank you in advance.
You can't use a simple integer to represent an index in a nested set of data, as you found out. Instead you need to use NSIndexPath. As the docs put it:
The NSIndexPath class represents the path to a specific node in a tree of nested array collections. This path is known as an index path.
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