>From memory I think the drawing problems only happened when I was trying to
>use overlay scrollers.
With my own scroller implementation, I wondered what was going on, and I see
that the backtrace is totally different when I am using overlay scrollers:
frame #0: 0x0000000100463304 NovaMind5`-[NMPresentableScroller drawRect:] +
148 at NMPresentableScroller.m:90
frame #1: 0x00007fff838870b2 AppKit`-[NSSurface displayIfNeeded] + 266
frame #2: 0x00007fff839a9d0d AppKit`-[NSView
_recursiveSyncAndDisplayViewBackingSurfacesIfNeeded:] + 212
frame #3: 0x00007fff87e2f0b6 CoreFoundation`__NSArrayEnumerate + 582
frame #4: 0x00007fff839a9df6 AppKit`-[NSView
_recursiveSyncAndDisplayViewBackingSurfacesIfNeeded:] + 445
frame #5: 0x00007fff87e2f0b6 CoreFoundation`__NSArrayEnumerate + 582
frame #6: 0x00007fff839a9df6 AppKit`-[NSView
_recursiveSyncAndDisplayViewBackingSurfacesIfNeeded:] + 445
frame #7: 0x00007fff87e2f0b6 CoreFoundation`__NSArrayEnumerate + 582
frame #8: 0x00007fff839a9df6 AppKit`-[NSView
_recursiveSyncAndDisplayViewBackingSurfacesIfNeeded:] + 445
frame #9: 0x00007fff87e2f0b6 CoreFoundation`__NSArrayEnumerate + 582
frame #10: 0x00007fff839a9df6 AppKit`-[NSView
_recursiveSyncAndDisplayViewBackingSurfacesIfNeeded:] + 445
frame #11: 0x00007fff87e2f0b6 CoreFoundation`__NSArrayEnumerate + 582
frame #12: 0x00007fff839a9df6 AppKit`-[NSView
_recursiveSyncAndDisplayViewBackingSurfacesIfNeeded:] + 445
frame #13: 0x00007fff87e2f0b6 CoreFoundation`__NSArrayEnumerate + 582
frame #14: 0x00007fff839a9df6 AppKit`-[NSView
_recursiveSyncAndDisplayViewBackingSurfacesIfNeeded:] + 445
frame #15: 0x00007fff83a20683 AppKit`-[NSView
_recursiveSyncDisplayAndFlushViewBackingSurfacesIfNeeded] + 96
frame #16: 0x00007fff83970c8a AppKit`-[NSView
_displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 1168
frame #17: 0x00007fff8393b993 AppKit`-[NSView displayIfNeeded] + 1830
versus normal drawing:
frame #0: 0x0000000100463304 NovaMind5`-[NMPresentableScroller drawRect:] +
148 at NMPresentableScroller.m:90
frame #1: 0x00007fff83979e20 AppKit`-[NSView _drawRect:clip:] + 4437
frame #2: 0x00007fff83976c93 AppKit`-[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
+ 3058
frame #3: 0x00007fff83977724 AppKit`-[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
+ 5763
frame #4: 0x00007fff83977724 AppKit`-[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
+ 5763
frame #5: 0x00007fff83977724 AppKit`-[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
+ 5763
frame #6: 0x00007fff83977724 AppKit`-[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
+ 5763
frame #7: 0x00007fff83977724 AppKit`-[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
+ 5763
frame #8: 0x00007fff83977724 AppKit`-[NSView
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
+ 5763
frame #9: 0x00007fff83975e23 AppKit`-[NSThemeFrame
_recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
+ 314
frame #10: 0x00007fff83971a3d AppKit`-[NSView
_displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 4675
frame #11: 0x00007fff8393b993 AppKit`-[NSView displayIfNeeded] + 1830
So I wondered what would happen if I used setWantsLayer:YES on my accessory
view, and low and behold it is now drawn on my 10.7+ style overlay views! Yay!
It doesn't auto-hide, and it only actually works when the scrollers are shown,
so I'm not sure that it's going to be that useful anyway. I thought the
auto-hiding might be done through the opacity of a backing layer on the view,
but there is apparently no layer on this view (!). I logged setAlphaValue: and
it wasn't called, so am not sure where the opacity is coming from.
If I can get it to auto-hide with the scroller, and make the scrollers stay
visible when the control is in use (it's sometimes a popup button, and
sometimes a text field), then it may work out well. Otherwise, I may just have
to stick with using either always visible scrollers, or find another location
for my zoom controls.
At least I
Regards
Gideon
On 08/07/2012, at 12:21 PM, Graham Cox <graham....@bigpond.com> wrote:
>
> On 08/07/2012, at 12:13 PM, Gideon King wrote:
>
>> Yes, I was using that type of code before too, but it didn't work with the
>> new scrollbar styles (drawing artifacts on resize, not automatically
>> hiding), which is what prompted me to look at subclassing the scroller
>> itself instead. Unfortunately it still only works with the legacy style
>> scrollers and not overlays as per my previous message.
>
>
> That's right. If you do anything to modify the position of the scrollers, it
> will revert to the legacy scrollbars. That's the way NSScroller works now.
> AFAIK, you can't have it both ways - add a placard and have overlay
> scrollers. That's why I moved my placard elsewhere. That said I never
> experienced drawing artefacts or other problems, it just used the old
> scrollbars.
>
> --Graham
>
>
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