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Re: table view with non-selectable rows
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Re: table view with non-selectable rows


  • Subject: Re: table view with non-selectable rows
  • From: Corbin Dunn <email@hidden>
  • Date: Mon, 20 Feb 2006 10:22:26 -0800


A table view which does not highlight rows but allows the user to klick checkboxes in a column of said table view.

I have many requests for this ability. Eventually, it will be easier to do.



To avoid the rows from highlighting, I tried to implement the - tableView:shouldSelectRow: delegate method and prevent the user from selecting a row. But if I do so, it is no longer possible to change the value of the check box in the first column.

Yes -- this is one of the problems. In order for tableview to "track" a cell, the row has to be selected. Eventually, this limitation may be changed, allowing one to still select rows, and still click on other checkboxes without changing the selection. For now, that ability is rather difficult to achieve without rewriting "mouseDown:".



After some experimentation I found a method that *almost* works. I do overwrite -_highlightColorForCell: and return [[self window] backgroundColor].



Okay, a few things. Don't override the private method! How did you find out that overriding this method would work?


Instead, you should subclass your cell, and override:

- (NSColor *)highlightColorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView;

return nil, and the highlight won't be drawn.


This has two drawbacks:

1. _highlightColorForCell: is a private method that I really shouldn't overwrite at all

Yes.


2. NSTableView's highlighting code seems to assume that a highlighted row is opaque. But I'm using that table view inside a sheet which is slightly transparent. So - depending on the contents of the window below - a highlighted row does still look different from the not highlighted one because it draws its background opaque.

I'm pretty sure that using a nil color will give you what you want. If not, please let me know more about what you are seeing vs. what you expect.
thanks,
corbin


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