Re: Getting NSProgressIndicators in an NSTableView

FROM : Simone Manganelli
DATE : Mon Nov 18 22:09:18 2002

OK, here's the thing.  I tried doing this, but all I'm getting is a
blank image in the column.

Here's the code that creates the NSImage of a progress indicator:

- (void)setProgBarImage:(NSNumber *)memUsage withMaxValue:(NSNumber
*)theMaxValue
{
    NSProgressIndicator *theProgressIndicator;
    [theProgBarImage release];
    theProgBarImage = [[NSImage alloc] initWithSize:NSMakeSize(60,12)];
    [theProgBarImage lockFocus];
    theProgressIndicator = [[NSProgressIndicator alloc] init];
    [theProgressIndicator setFrame:NSMakeRect(0,0,60,12)];
    [theProgressIndicator setMaxValue:[theMaxValue doubleValue]];
    [theProgressIndicator setDoubleValue:[memUsage doubleValue]];
    [theProgressIndicator stopAnimation:nil];
    [theProgressIndicator drawRect:NSMakeRect(0,0,60,12)];
    [theProgBarImage unlockFocus];
    [theProgressIndicator release];
}

Here's the code that is run on startup in an awakeFromNib method, since
I see no way of setting a column to have image cells via Interface
Builder in the nib:

    theTableColumn = [tableViewTotal
tableColumnWithIdentifier:@"theProgBarImage"];
    theDataCell = [[NSImageCell alloc] init];
    [theTableColumn setDataCell:theDataCell];
    [theDataCell release];

When the NSTableView wants the images for the columns, it just calls
the method "theProgBarImage", since that is the columns identifier. 
But I don't get anything in the columns.  So what am I doing wrong?

-- Simone Manganelli

On Monday, Nov 18, 2002, at 09:38 US/Pacific, matt neuburg wrote:

> On Sat, 16 Nov 2002 19:07:05 -0800, Simone Manganelli <<email_removed>>
> said:
>
>> I've got a problem.  I want to get some progress indicators in an
>> NSTableView, with a column dedicated to just progress indicators with
>> different data.
>>
>> I understand that this is possible by using image cells, but I'm not
>> sure where to start.  I was told that I could make an array of
>> NSImages
>> that I could then feed through the dataSource of the NSTableView so
>> that it is displayed.
>>
>> Is there a way to produce an NSProgressIndicator as an image that I
>> could then fit into an array of images?  If so, what's the easiest way
>> to do this.  If not, what other method can I use?  Will I have to draw
>> an image myself?
>
> That's what I ended up doing. This is a very easy approach because if
> a column's datacell is an imagecell, then the value you return as
> objectValueForTableColumn simply is the image. If you search the
> archives you'll find several other solutions, mostly involving
> overriding the way the cell draws itself, but this felt rather
> over-elaborate to me so I didn't bother to try it. m.
>
> matt neuburg, phd = <email_removed>, http://www.tidbits.com/matt
> pantes anthropoi tou eidenai oregontai phusei
> Subscribe to TidBITS! It's free and smart. http://www.tidbits.com/
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