I have having a problem working with NSScrollView. The code is in pieces
all over
the desk at the moment, but I'm asking in case someone recognises the
symptoms,
before I reduce this to a simple test case.
An NSScrollView is made from an NSView containing various NSControls. The
NSView
is fine before the NSScrollView and, when the NSScrollView is shown, looks
fine.
It shows the top portion of the NSView, as expected.
But, the vertical scroll bar position is at the BOTTOM of the window. Now,
the
curious part starts. If the NSScrollView is scrolled upwards, the content in
the window moves down (as normal). What we now see is a large white space
at the
top of the NSScrollView, and below that the same view portion we first saw.
To put it another way, the NSView we scroll is a view containing white
space at
the top, and part of the original NSView below that. Yet all the rectangles
I
can find show (0,0) as the origin as I'd expect.
Note that this is NOT a question about how to make the scroll bar first
appear
at the top. If I use [myScrollView.contentView
scrollPoint:NSMakePoint(0,height)]
I get the same effect as dragging the scroll bar to the top.
Maybe ASCII art can explain
Complete NSView (to be scrolled)
+-------------
+
+ TOP LABEL
+
+ Explanation
+
+ [x] Check box
+
+ {Cancel} {OK}
+
+-----------------
Initial NSScrollView (scroll bar shown at BOTTOM)
+-------------
+
+ TOP LABEL
+
+ Explanation
+
+ [x] Check box
+---------------
Effect of moving scroll bar to the top
+-------------
+
+
+
+
+ TOP LABEL
+
+---------------
Scrolling does not make the Cancel and OK buttons appear at all.
Thanks in advance!
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