Hi,
I have just a tab view on my main window and I switch tabs based on user input.
First tab has three hover buttons and on clicking one of them, it takes to
another tab which two hover buttons.
After clicking one of the two hover buttons, I switch tab and show a table view
and then show and end a sheet.
On clicking another button there I bring another sheet with radio buttons and
on clicking a radio button, it just crashed, many seconds after the last hover
button was clicked.
The crash report says something about _updateTrackingAreas, so I have detailed
about the situation above.
Part of code is reproduced below.
@interface HoverButton : NSButton
{
NSTrackingArea *trackingArea;
BOOL hovering;
}
//-------- Implementation
- (void)ensureTrackingArea
{
if (trackingArea == nil) {
trackingArea = [[NSTrackingArea alloc] initWithRect:[self bounds]
options:
(NSTrackingMouseEnteredAndExited | NSTrackingActiveInKeyWindow |
NSTrackingInVisibleRect)
owner:self userInfo:nil];
}
}
- (void)updateTrackingAreas
{
if (trackingArea) {
[trackingArea release];
trackingArea = nil;
}
[self ensureTrackingArea];
[self addTrackingArea:trackingArea];
[super updateTrackingAreas];
}
- (void)mouseExited:(NSEvent *)theEvent
{
// shows one image over the button
}
- (void)mouseEntered:(NSEvent *)theEvent
{
// shows another image over the button
}
Part of the crash report stack trace:
Application Specific Information:
objc_msgSend() selector name: retain
objc[347]: garbage collection is OFF
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libobjc.A.dylib 0x00007fff97c31350
objc_msgSend_vtable13 + 16
1 com.apple.CoreFoundation 0x00007fff96525b87 +[__NSArrayI
__new::] + 167
2 com.apple.CoreFoundation 0x00007fff96525a75
-[__NSPlaceholderArray initWithObjects:count:] + 245
3 com.apple.CoreFoundation 0x00007fff965287c0 -[NSArray
initWithArray:range:copyItems:] + 816
4 com.apple.CoreFoundation 0x00007fff96528482 -[NSArray
initWithArray:copyItems:] + 66
5 com.apple.CoreFoundation 0x00007fff9654caf6 -[__NSArrayM
copyWithZone:] + 54
6 com.apple.CoreFoundation 0x00007fff96524d54 -[NSObject
copy] + 20
7 com.apple.AppKit 0x00007fff942a7ad2
-[NSView(NSInternal) _updateTrackingAreas] + 1295
8 com.apple.CoreFoundation 0x00007fff96574cee
__NSArrayEnumerate + 718
9 com.apple.AppKit 0x00007fff942a7aeb
-[NSView(NSInternal) _updateTrackingAreas] + 1320
10 com.apple.CoreFoundation 0x00007fff96574cee
__NSArrayEnumerate + 718
11 com.apple.AppKit 0x00007fff942a7aeb
-[NSView(NSInternal) _updateTrackingAreas] + 1320
12 com.apple.CoreFoundation 0x00007fff96574cee
__NSArrayEnumerate + 718
13 com.apple.AppKit 0x00007fff942a7aeb
-[NSView(NSInternal) _updateTrackingAreas] + 1320
14 com.apple.CoreFoundation 0x00007fff96574cee
__NSArrayEnumerate + 718
15 com.apple.AppKit 0x00007fff942a7aeb
-[NSView(NSInternal) _updateTrackingAreas] + 1320
16 com.apple.CoreFoundation 0x00007fff96574cee
__NSArrayEnumerate + 718
17 com.apple.AppKit 0x00007fff942a7aeb
-[NSView(NSInternal) _updateTrackingAreas] + 1320
18 com.apple.CoreFoundation 0x00007fff96574cee
__NSArrayEnumerate + 718
19 com.apple.AppKit 0x00007fff942a7aeb
-[NSView(NSInternal) _updateTrackingAreas] + 1320
20 com.apple.CoreFoundation 0x00007fff96574cee
__NSArrayEnumerate + 718
21 com.apple.AppKit 0x00007fff942a7aeb
-[NSView(NSInternal) _updateTrackingAreas] + 1320
22 com.apple.AppKit 0x00007fff942a7444 __-[NSWindow
_postInvalidCursorRects]_block_invoke_1 + 1107
23 com.apple.CoreFoundation 0x00007fff9653c8e7
__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
24 com.apple.CoreFoundation 0x00007fff9653c846
__CFRunLoopDoObservers + 374
25 com.apple.CoreFoundation 0x00007fff96511af9 __CFRunLoopRun
+ 825
26 com.apple.CoreFoundation 0x00007fff96511486
CFRunLoopRunSpecific + 230
27 com.apple.HIToolbox 0x00007fff959702bf
RunCurrentEventLoopInMode + 277
28 com.apple.HIToolbox 0x00007fff959774bf
ReceiveNextEventCommon + 181
29 com.apple.HIToolbox 0x00007fff959773fa
BlockUntilNextEventMatchingListInMode + 62
30 com.apple.AppKit 0x00007fff941e1779 _DPSNextEvent +
659
31 com.apple.AppKit 0x00007fff941e107d -[NSApplication
nextEventMatchingMask:untilDate:inMode:dequeue:] + 135
32 com.apple.AppKit 0x00007fff941dd9b9 -[NSApplication
run] + 470
33 com.apple.AppKit 0x00007fff94459eac
NSApplicationMain + 867
34 com.MyCompany.MyProduct 0x00000001063c00b4 start + 52
My questions are:
1. After adding tracking area initially, will it be okay to not release and add
it again since the button is not resizable?
2. In updateTrackingAreas method, does it matter if the [super
updateTrackingAreas]; is called in the beginning or the end?
3. Do I need to do something when the tab showing the hover button is not
visible considering the options used to init the trackingArea.
4. What could have caused the crash?
I am using HoverButton in the nib file by setting the class to HoverButton, and
not programatically. The code is non-ARC and non-GC.
Any help would be greatly appreciated.
Thanks,
Nick
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