Instance Method

validateToolbarItem:

If this method is implemented and returns NO, NSToolbar will disable theItem; returning YES causes theItem to be enabled.

Declaration

- (BOOL)validateToolbarItem:(NSToolbarItem *)item;

Discussion

NSToolbar only calls this method for image items.

If the receiver is the target for the actions of multiple toolbar items, it’s necessary to determine which toolbar item theItem refers to by testing the itemIdentifier.

-(BOOL)validateToolbarItem:(NSToolbarItem *)toolbarItem
{
    BOOL enable = NO;
    if ([[toolbarItem itemIdentifier] isEqual:SaveDocToolbarItemIdentifier]) {
        // We will return YES (enable the save item)
        // only when the document is dirty and needs saving
        enable = [self isDocumentEdited];
    } else if ([[toolbarItem itemIdentifier] isEqual:NSToolbarPrintItemIdentifier]) {
        // always enable print for this window
        enable = YES;
    }
    return enable;
}

See Also