Adaptable NSTableViewHeader
Adaptable NSTableViewHeader
- Subject: Adaptable NSTableViewHeader
- From: Mattias Arrelid <email@hidden>
- Date: Tue, 30 Oct 2007 17:24:42 +0100
Hi everyone,
My problem is quite hard to explain in just a few words, but I'll give
it a try. Additionally, I'm attaching an URL to a video shot of the
running application along with the application project (only one
custom class, very few lines of code) below so you can test it
yourself too:
I have subclassed the NSTableHeaderView class so that when it is
displayed (e.g. its drawRect is called) it renders additional
information about the table view above the ordinary table column
headers. Think of it as two vertical divisions:
Upper part - Shows some statistics about the table view
Lower part - Displays the table column headers
Now, if I set my tableview's headerview to my custom subclass, and
place the tableview inside a NSScrollView, my custom tableview header
is displayed just fine. So far, so nice. Now let us assume that the
statistics are not that important for the user, so as she begins to
scroll everything that is visible in the clip view (table header view
+ table view) is scrolled - until the only part that's visible in the
custom NSTableHeaderView class are the table column headers. At this
stage, the clip view should start to scroll the rows for the table
view instead, keeping the header locked in the upper part of the clip
view (just as a tableview with a normal header works when one scrolls).
I havn't been able to accomplish this in an efficient manner. In the
attached example (which doesn't perform too much unnecessary rendering
according to Quartz Debug), it almost works - there are only two
things that goes wrong; (1) the table rows begins to scroll up "under"
the header view instantly - I want them to do that first when the
table header view has "snapped" - and (2) the table view rows don't
render correctly sometimes (see movie - a part of row 11 gets stuck at
the bottom of the view in the beginning).
Any suggestion on how to accomplish this would be more than welcome.
URL to project: http://arrelid.com/dump/tableTest-project.zip
URL to video: http://arrelid.com/dump/tableTest.mov
Thanks in advance
Mattias
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