On 2 Jul 2009, at 9:36 AM, Shawn Erickson wrote:
On Thu, Jul 2, 2009 at 8:37 AM, Michael Ash<michael....@gmail.com>
wrote:
On Thu, Jul 2, 2009 at 10:51 AM, Chris Carson<cucar...@yahoo.com>
wrote:
Hello,
I've created a simple application with an NSTableView. I have
written a delegate for this table,
numberOfRowsInTableView:objectValueForTableColumn:row:, that
returns the number of rows in the table when requested.
My application uses the table view to display hexadecimal data on
a flash memory chip, with 16 bytes displayed per row. As a test, I
tried returning a large number for the number of rows, 0x1000000.
When I scroll through the table, everything looks okay for the
first 14 million rows or so, after which the gray horizonal cell
separator disappears and the row data begins to shift by a pixel
per row, until it eventually is superimposed on the row above it.
This seems like a bug with the NSTableView class, but perhaps I'm
doing something wrong. Has anyone else run into this problem?
Known problem:
http://www.google.com/search?client=safari&rls=en-us&q=nstableview+14+million&ie=UTF-8&oe=UTF-8
Either restrict your app to running in 64-bit mode (which will cause
the graphics system to use doubles instead of floats) or write a
custom control.
...or seriously reconsider the utility (expectation) of having
millions of row in a table view.
Do users really want to scroll thru that many rows? Can users work
with that much data? etc.
In other words will this really be a problem without first causing
usability problems for your users.
Not to mention that dragging the scroll thumb one pixel will result in
thousands of rows scrolled at once. Simply useless.
-- Tito
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