cells and highlighting

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2 total messages Started by Ed Lau Wed, 05 Aug 1992 03:48

#448

Author: Ed Lau
Date: Wed, 05 Aug 1992 03:48

18 lines
1163 bytes

Would someone please explain to me how a matrix accomplishes highlighting of a  
cell?

The documentation states that the contents of the cell is composited with  
NX_HIGHLIGHT, but I couldn't find a description of NX_HIGHLIGHT anywhere. It  
would seem to me that the AppKit handles the highlighting for you. However, in  
one of the NeXT MiniExamples, the background color of a cell is chosen in the  
code by checking the cFlags1.state and .highlighted bits. This suggests to me  
that it is up to the programmer to implement highlighting. Who's right?

On a related note, what happens to the cFlags1.state and cFlags1.highlighted  
flags of a cell during and after a mouseDown:?

Thanks in advance.

--Ed Lau
edlau@mitl.com

Re: cells and highlighting

#487

Author: moose
Date: Thu, 06 Aug 1992 17:18

35 lines
1830 bytes

In article <1992Aug5.034851.14628@MITL.COM> edlau@mitl.com (Ed Lau) writes:
> 
> Would someone please explain to me how a matrix accomplishes highlighting of  
a  
> cell?
> 
> The documentation states that the contents of the cell is composited with  
> NX_HIGHLIGHT, but I couldn't find a description of NX_HIGHLIGHT anywhere. It  
> would seem to me that the AppKit handles the highlighting for you. However,  
in  
> one of the NeXT MiniExamples, the background color of a cell is chosen in the  
> code by checking the cFlags1.state and .highlighted bits. This suggests to me  
> that it is up to the programmer to implement highlighting. Who's right?
> 
> On a related note, what happens to the cFlags1.state and cFlags1.highlighted  
> flags of a cell during and after a mouseDown:?

According to OOP, none of your business what they are doing :->.

Every cell has a routine called:

- highlight:(const NXRect *)cellFrame	inView:controlView lit:(BOOL)flag;

which is used to highlight the cell.  By using this with setState: you should  
be able to highlight the cells manually without worrying about the internal  
flags.  

Note:  There are some problems using this with NXBrowsers under system 2.x, but  
it seems to work great under 3.0.

--
Michael Rutman			|	moose@svcdudes.com
Cubist				|	makes me a NeXT programmer
Software Ventures		|	maker of MicroPhone II
#include <std.disclaimer>

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