Dear Volker,
I noticed that no IBAction/IBOutlet is available for the items in the code.
Should I make some connections for them?
I just connect the context menu with the class of ContextMenuView and
connect the NSView in the Window with ContextMenuView.
Thanks,
LB
On Tue, Apr 5, 2011 at 4:06 AM, Volker in Lists <volker_li...@ecoobs.de>wrote:
> Hi,
>
> have you connected the menu items in interface builder with their commands?
> Then they will get active, if the responder is also available.
>
> volker
> Am 04.04.2011 um 21:38 schrieb Bing Li:
>
> > Dear all,
> >
> > I am now learning programming on Cocoa following the book, Cocoa
> Programming
> > Developers Handbook.
> >
> > When programming Context Menus (Page 237), I got a problem. Although the
> > context menu can be shown, it is weird that all of the items in the
> context
> > menu are disabled. However, when running the sample provided by the book,
> > the items are enabled. I think I follow the book restrictedly. I could
> NOT
> > get the solution. The major code is as follows, which is completely from
> the
> > book. Could you please give me a hint?
> >
> > Thanks so much!
> > LB
> >
> > import "ContextMenuView.h"
> >
> > static NSMenu *defaultMenu;
> >
> > @implementation ContextMenuView
> > + (NSMenu*)defaultMenu
> > {
> > if (nil == defaultMenu)
> > {
> > @synchronized(self)
> > {
> > if (nil == defaultMenu)
> > {
> > defaultMenu = [NSMenu new];
> > [defaultMenu addItemWithTitle: @"Copy"
> >
> > action: @selector(copy:)
> >
> > keyEquivalent: @"c"];
> > [defaultMenu addItemWithTitle: @"Paste"
> >
> > action: @selector(paste:)
> >
> > keyEquivalent: @"v"];
> > }
> > }
> > }
> > return defaultMenu;
> > }
> > static BOOL addItemsToMenuFromMenu(NSMenu *menu, NSMenu *template)
> > {
> > for (NSMenuItem *item in [template itemArray])
> > {
> > NSMenuItem *itemCopy = [item copy];
> > [menu addItem: itemCopy];
> > [itemCopy release];
> > }
> > return [menu numberOfItems] > 0;
> > }
> > - (NSMenu*)menuForEvent: (NSEvent*)theEvent
> > {
> > NSPoint click = [self convertPoint: [theEvent locationInWindow]
> > fromView: nil];
> >
> > NSMenuItem *locationMenuItem =
> > [[NSMenuItem alloc] initWithTitle: NSStringFromPoint(click)
> > action: NULL
> > keyEquivalent: @""];
> > [locationMenuItem setEnabled: NO];
> > NSMenu *menu = [NSMenu new];
> > [menu addItem: locationMenuItem];
> > [locationMenuItem release];
> > [menu addItem: [NSMenuItem separatorItem]];
> > if (addItemsToMenuFromMenu(menu, [self menu]))
> > {
> > [menu addItem: [NSMenuItem separatorItem]];
> > }
> > addItemsToMenuFromMenu(menu, [[self class] defaultMenu]);
> > return [menu autorelease];
> > }
> > @end
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