- (BOol)valIDateMenuItem:(NSMenuItem *)menuItem{ return ([menuItem action] == @selector(performClose:) || [menuItem action] == @selector(performZoom:) || [menuItem action] == @selector(performMiniaturize:)) ? YES : [super valIDateMenuItem:menuItem];}- (BOol)windowshouldClose:(ID)sender{ return YES;}- (voID)performClose:(ID)sender{ if([[self delegate] respondsToSelector:@selector(windowshouldClose:)]) { if(![[self delegate] windowshouldClose:self]) return; } else if([self respondsToSelector:@selector(windowshouldClose:)]) { if(![self windowshouldClose:self]) return; } [self close];}- (voID)performMiniaturize:(ID)sender{ [self miniaturize:self];}- (voID)performZoom:(ID)sender{ [self zoom:self];}总结
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