objective-c - NS菜单项 : Truncation and setLineBreakMode

Question

我正在以编程方式创建几个菜单项，如下所示:

    NSMenuItem* newItem = [[NSMenuItem alloc] initWithTitle:t action:s keyEquivalent:e];
    [newItem setTarget:target];
    [newItem setEnabled:YES];

    [self addItem:newItem];

我想像这样截断它们的内容(在中间):

Some really really long title ---> Some rea...title

我读过有关使用 setLineBreakMode 方法的内容...但是如何使用？(我认为我做错了什么:-S)

Answer 1

一个可能的解决方案包括使用 NSAttributedString 和 [NSMenuDelegate confinementRectForMenu:onScreen:screen];

confinementRectForMenu 是设置你想要的最大宽度所必需的

只是为了向您展示一个没有委托(delegate)的示例，下面我展示了一个带有非常大字体的菜单项

NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle]
                                 mutableCopy];
[style setLineBreakMode:NSLineBreakByTruncatingMiddle];

NSDictionary* paragraphStyle = [[NSDictionary alloc] initWithObjectsAndKeys:
                 style, NSParagraphStyleAttributeName, 
                 [NSFont fontWithName:@"Lucida Grande" size:43.0f],
                  NSFontAttributeName,
                 nil];
[style release];
NSString* title = @"long titlelong titlelong titlelong titlelong titlelong titlelong and another string titlelong titlelong title end";
NSAttributedString* str = [[[NSAttributedString alloc] initWithString:title attributes:paragraphStyle] autorelease];

NSMenuItem* newItem = [[NSMenuItem alloc] initWithTitle:title action:@selector(showWhitespaces:) keyEquivalent:@""];
[newItem setAttributedTitle:str];
[newItem setEnabled:YES];
[theMenu addItem:newItem];