Thanks for quick replies....things are a little more clear now, so I will stick
with the NSArray version.
Just a question at Quincey: Maybe it's me, but I'm not sure how I could convert
the 'item' parameter of both NSOutlineView datasource methods to a row number ?
Where should I get the index value ?
On 23 nov. 2011, at 19:32, Quincey Morris wrote:
> On Nov 23, 2011, at 07:58 , Gilles Celli wrote:
>
>> I've setup an NSOutlineView with 2 colums: the first one named
>> "buttonColumns" with NSButtonCell (Switch ON / OFF)
>> and the second one with TextFieldCell…
>>
>> While the state change works for NSButtonCell in the buttonColum I had to
>> create an NSArray *checks to set it ON or OFF.
>> Is there an easier way to change the state of an NSButtonCell in an
>> NSOutlineView without using an NSArray ?
>
> NSOutlineView and NSTableView are interface elements that are backed by a
> data model. They do not store the data model, because they need to support
> (virtually) very large numbers of rows, and keeping the data model (or a copy
> of part of it) in the view would be too expensive of memory.
>
> Therefore, you need to supply the data model, and then either provide a data
> source or bindings to connect it to the view. You need either (a) this array
> of BOOLs, or (b) a BOOL property of some objects in the rest of your data
> model.
>
>> The code I'm using seems a little bit overkill for me...there must be a
>> simpler solution…
>
> For a data source, this amount of code isn't overkill. Data source methods
> often end up being wordy and ugly. You could eliminate the code altogether by
> using bindings, but you'd have to use solution (b) above -- bindings need an
> array property of some data model object, and your array doesn't qualify.
>
> Also, I'm pretty sure your code is not doing what you thing it does:
>
>> Here's what I've done so far and it works:
>>
>> // init code
>>
>> checks = [[NSMutableArray alloc] init];
>> for ( int i=0; i < NBR_OF_ROWS; i++ )
>> [checks addObject:[NSNumber numberWithInt:0]];
>>
>> // NSOutlineView datasource methods
>>
>> - (id)outlineView:(NSOutlineView *)outlineView
>> objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item
>> {
>> id theValue;
>> NSInteger selectedRowIndex = [outlineView selectedRow];
>
> You're getting the 'checks' value for the *selected* row, which is not the
> row whose object value is being asked for in this method. This means that
> when the selection changes, the check boxes on *all* of the rows will change
> (though you might not see that until redrawing of the entire view is forced).
>
> Instead, you should convert the 'item' parameter to a row number.
>
>> if ( [[tableColumn identifier] isEqualToString:@"buttonColumn"] )
>> {
>> theValue = [checks objectAtIndex:selectedRowIndex];
>> }
>> return theValue;
>> }
>>
>> - (void)outlineView:(NSOutlineView *)outlineView setObjectValue:(id)object
>> forTableColumn:(NSTableColumn *)tableColumn byItem:(id)item
>> {
>> NSInteger selectedRowIndex = [outlineView selectedRow];
>>
>> if ( [[tableColumn identifier] isEqualToString:@"buttonColumn" ])
>> {
>> [checks replaceObjectAtIndex:selectedRowIndex withObject:object];
>> }
>> }
>
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