Re: NSTableView variable row height and noteHeightOfRowsWithIndexesChanged during live resize
Re: NSTableView variable row height and noteHeightOfRowsWithIndexesChanged during live resize
- Subject: Re: NSTableView variable row height and noteHeightOfRowsWithIndexesChanged during live resize
- From: Corbin Dunn <email@hidden>
- Date: Fri, 24 Apr 2009 08:34:00 -0700
On Apr 23, 2009, at 5:44 PM, Stuart Malin wrote:
On Apr 23, 2009, at 1:18 PM, Corbin Dunn wrote:
On Apr 23, 2009, at 3:37 PM, Stuart Malin wrote:
On Apr 23, 2009, at 12:33 PM, Corbin Dunn wrote:
On Apr 23, 2009, at 2:55 PM, Stuart Malin wrote:
I have an NSTableView with a single column that has a custom
cell. During a live resize, I recalculate the row height in the
delegate method -tableView:heightForRow: and return the result.
However, some rows don't grow larger. I presume I need to call
the tableview's -noteHeightOfRowsWithIndexesChanged for each row
that has a height change. Is it okay to call this from within
the tableView:heightForRow: method?
No, it is not; you'll have to redo your logic, or call it with a
range for all rows (probably the easiest thing to do).
Thanks Corbin.
What about from within the tableview delegate method -
tableViewColumnDidResize ?
That is fine; note that it is only sent out when the live-resize
method ends. Your calculation in -heightForRow: can't depend on the
-[tableColumn width], unless you call the -noteHeightXX method more
frequently (ie: you'd have to capture when the setWidth: happens by
subclassing the table column).
I subclassed the table column and overrode its -setWidth method.
When that is invoked, I recalculate the cell heights for *only* the
visible rows. I keep track of those rows that change, prepare an
index set, and notify the table view with -noteHeightXXX.
Works like a charm!
Question: presently, in the overridden -setWidth, I invoke -
noteHeightXXX *before* calling [super setWidth:newWidth] As I
said, this works, and seems to me to be the logical ordering of
events, but just want to check if I should be calling -noteHeightXXX
*after* invoking the super (NSTableColumn) -setWidth.
That should be okay since layout is done lazily (in -viewWillDraw:),
but you may want to call the note after calling [super setWidth:]. The
reasoning is as follows: if the -noteHeightXX method calls your
delegate immediately, and it then recalculates a new row height based
on the [column width], then things will be wrong. In practice, this
doesn't happen, but there is no reason it couldn't.
corbin
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