Q: Matrix on ScrollView

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2 total messages Started by Zenon Fortuna Sat, 21 Nov 1992 19:08

#1881

Author: Zenon Fortuna
Date: Sat, 21 Nov 1992 19:08

19 lines
1011 bytes

I have a Matrix of ButtonCells displayed in a ScrollView.
To help with scrolling using the mouse, I have added the
	[buttonMatrix setAutoscroll:YES] ;
message.
To have scrolling only through whole ButtonCells, I have added also
	[scrollView setLineScroll:64] ;
				// my ButtonCells are 64 units high
It works OK.

Q: How can I find which cells of the Matrix are visible ?

In other words I would like to know which is the first visible ButtonCell
and which is the last one.
I have tried to find the answer in the documentation, but slowly have the
feeling that I am asking too much ?    :-(

I will appreciate any hint and proof that I am wrong.

	-Z.

A: Matrix on ScrollView

#1884

Author: Zenon Fortuna
Date: Sun, 22 Nov 1992 14:24

26 lines
1294 bytes

In article <1992Nov21.190811.13963@resonex.com> zenon@resonex.com (Zenon Fortuna) writes:
>I have a Matrix of ButtonCells displayed in a ScrollView.
>To help with scrolling using the mouse, I have added the
>	[buttonMatrix setAutoscroll:YES] ;
>message.
>To have scrolling only through whole ButtonCells, I have added also
>	[scrollView setLineScroll:64] ;
>				// my ButtonCells are 64 units high
>It works OK.
>
>Q: How can I find which cells of the Matrix are visible ?
>

Many thanks to Art Isbell and John Kheit for their suggestions.
As Art writes:
>
> You must be using a ClipView to display only a portion of your Matrix, so you
> might look at ClipView's getDocVisibleRect: to provide you with the coordinate
s
> of the visible Matrix rectangle.  Then, of course, you'll have to do the math
> (Button height and inter-Button separation) to determine what cells are
> visible.

It works. Thank you.

	-Z.

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