迫使NSPopover成为NSTokenField的第一响应者

Question

我有一个NSTokenField,我在popover中提供自定义自动完成功能.不幸的是,一旦弹出窗口显示它就迫使NSTokenField辞职第一响应者.有没有办法显示弹出窗口而不是松开NSTokenField上的第一响应者？

覆盖NSTokenField的resignFirstResponder会导致NSTokenField停止工作(它不接受任何击键).覆盖NSPopover的acceptFirstResponder方法或按照此问题中的建议设置其行为也不起作用.

编辑:NSTokenField不在NSPopover的contentViewController.view中.Edit2:像Mailapp中搜索栏的行为将是最佳解决方案.

Answer 1

不幸的是,没有干净的方法来做到这一点.幸运的是,我在Delicious Library 3中已经完成了这个丑陋的方式 - 您需要将此方法放在NSWindow的子类中,并确保所讨论的文档窗口是该子类:

- (BOOL)makeFirstResponder:(NSResponder *)responder;
{
    // Prevent popover content view from forcing our current first responder to resign
    if (responder != self.firstResponder && [responder isKindOfClass:[NSView class]]) {
        NSWindow *const newFirstResponderWindow = ((NSView *)responder).window;
        NSWindow *currentFirstResponderWindow;

        NSResponder *const currentFirstResponder = self.firstResponder;
        if ([currentFirstResponder isKindOfClass:[NSWindow class]])
            currentFirstResponderWindow = (id)currentFirstResponder;
        else if ([currentFirstResponder isKindOfClass:[NSView class]])
            currentFirstResponderWindow = ((NSView *)currentFirstResponder).window;

        // Prevent some view in popover from stealing our first responder, but allow the user to explicitly activate it with a click on the popover.
        // Note that the current first responder may be in a child window, if it's a control in the "thick titlebar" area and we're currently full-screen.
        if (newFirstResponderWindow != self && newFirstResponderWindow != currentFirstResponderWindow && self.currentEvent.window != newFirstResponderWindow)
            for (NSView *responderView = (id)responder; responderView; responderView = responderView.superview)
                if ([responderView conformsToProtocol:@protocol(LIPopoverFirstResponderStealingSuppression)] &&
                    ((id <LIPopoverFirstResponderStealingSuppression>)responderView).suppressFirstResponderWhenPopoverShows)
                    return NO;
    }

    return [super makeFirstResponder:responder];
}

现在确保popover的内容视图子类实现此协议:

// NSPopover doesn't respect -acceptsFirstResponder of its content view (Radar 10666891).
@protocol LIPopoverFirstResponderStealingSuppression <NSObject>
@property (readonly, nonatomic) BOOL suppressFirstResponderWhenPopoverShows;
@end

还请向Apple提交一个错误请求NSPopover尊重其内容视图的-acceptsFirstResponder; 100%的情况是,当多个开发人员提交错误时,他们会得到修复.