Re: Sizing NSTableView to data
Re: Sizing NSTableView to data
- Subject: Re: Sizing NSTableView to data
- From: Andrew Satori <email@hidden>
- Date: Wed, 18 Jul 2012 22:20:20 -0400
Unfortunately, the sizeToFit method seems to create and infinite loop condition. trying to sort out WHY it happens.
On Jul 18, 2012, at 1:13 AM, Kyle Sluder wrote:
> On Thu, Jun 28, 2012, at 04:42 PM, Maury Markowitz wrote:
>> I am working on the ODBCkit's Query Tool to make it work across a wide
>> variety of data sources - so far all the major commercial DB's, Firebird,
>> MySQL and even SQLite! Got an ODBC target and test DB you'd like to test?
>> Throw it my way!
>>
>> One problem that's come up in a couple of different places is that many
>> SQL data types are fixed-width. I ask the recordset for the width, but it
>> lies - it says 255 chars, but in fact there's only maybe 25 characters
>> actually in the field. It is also surprisingly common to find numbers
>> held in huge fixed-char fields. When I space out my TableView based on
>> what the DB tells me, I end up with lots of whitespace.
>>
>> I notice that *after* the DataSource is done setting up and the data is
>> in the display, double-clicking the "divider line" in the header gives me
>> perfect results. Is there a way to simulate that double-click in code?
>> Ideally I'd like to find out what the width would be if I did the action,
>> then adjust it for max/min sizes in the code.
>
> According to the AppKit release notes [1], NSTableView sizes a column to
> fit by taking the maximum of the sizes of the preparedCellAtRow:column:
> for some number of rows. (I believe Corbin has said it takes a random
> subset when the number of rows in the data source is large). This is
> presumably why they recommend you implement
> -tableView:sizeToFitWidthOfColumn: yourself rather than have NSTableView
> do it.
>
> I'd say you should file an enhancement request asking for the ability to
> ask NSTableView to size a particular column to fit, just as if the user
> had double-clicked the divider in the header, as it only seems to have
> methods that distribute remaining size uniformly or only to the last
> column.
>
> In the meantime, implement -tableView:sizeToFitWidthOfColumn: to return
> the right value for each column, and then just call -sizeToFit on the
> table view.
>
> [1]
> https://developer.apple.com/library/mac/#releasenotes/Cocoa/AppKitOlderNotes.html
>
> --Kyle Sluder
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