May 99 Tips
Volume Number: 15
Issue Number: 5
Column Tag: Tips & Tidbits
by Jeff Clites <online@mactech.com>
Stopping Default New Documents in Yellow Box Applications
The NSDocument and NSDocumentController classes in the Yellow Box AppKit make it
trivial to create multi-document applications on Mac OS X Server. However the default
behavior is to always open a new file on launching the app. Fortunately there is an easy
solution to prevent this behavior. In your NSApplication object's delegate, add the
following method:
- (BOOL) applicationShouldOpenUntitledFile:
(NSApplication *)sender
Your application will no longer automatically open a blank document on launch! A
better solution might be to take that setting from the defaults database, allowing you to
control this behavior via a preference panel:
- (BOOL) applicationShouldOpenUntitledFile:
(NSApplication *)sender
return [[NSUserDefaults standardUserDefaults]
boolForKey:@"applicationShouldOpenUntitledFile"];
}
If the default applicationShouldOpenUntitledFile is set to YES, then a new empty
document will be created.
Scott Anguish
<sanguish@digifix.com>
Disappearing Apple Menu Submenus
It's easy to forget that even when you think you are just writing a simple console
application, you are really writing an honest-to-goodness Macintosh application with
a GUI. With CodeWarrior you are actually using the SIOUX library, which does all of
the work of tricking you into thinking you are writing in pure C or C++. Actually,
SIOUX allows you to customize many things, such as window title, font and font size,
and whether it should auto-save its contents upon quitting. Most usefully, it lets you
use Mac Toolbox calls and post events to your application's event queue. Here are Mac
implementations as few common console routines to demonstrate the possibilities,
courtesy of Metrowerks' MWRon <MWRon@metrowerks.com>. SIOUX is fully
documented in the MSL C Reference on the CodeWarrior Reference CD.
/*MyConsole.h */
#include
#include
#include
#include
#include
/* MyConsole.c */
void clrscr(void);
int kbhit(void);
int getch(void);
void clrscr(void)
EventRecord rEvent;
rEvent.what = keyDown;
rEvent.when = TickCount( );
rEvent.message = 'a';
rEvent.modifiers = cmdKey;
SIOUXHandleOneEvent( &rEvent );
rEvent.what = keyDown;
rEvent.when = TickCount( );
rEvent.message = 0x7F;
rEvent.modifiers = 0;
SIOUXHandleOneEvent( &rEvent );
}
int kbhit(void)
EventRecord event;
return EventAvail(keyDownMask,&event);
}
int getch(void)
EventRecord event;
fflush(stdout);
// Allow SIOUX response for the mouse, drag, zoom, or resize.
while(!GetNextEvent(keyDownMask,&event))
if(GetNextEvent(mDownMask|mUpMask,&event))
SIOUXHandleOneEvent(&event);
}
c = event.message&charCodeMask;
if(c=='.' && (event.modifiers&cmdKey))exit(1);
return c;
}