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 _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
