Question

我正在创建一个IntelliSense样式弹出窗口，显示在文本字段中键入哪些语法有效的用户。有没有人知道如何在不给予焦点的情况下显示NSPopover，以便用户可以继续输入textField？弹出窗口由controlTextDidChange：

触发

- (void) controlTextDidChange:(NSNotification *)obj
{

    NSTextField *field = [obj object];
    NSString *command = [field stringValue];

    if ([[command substringFromIndex: command.length - 1] isEqualToString: @"#"]){
        CompletionMenuController *completionController = [[CompletionMenuController alloc] initWithNibName: @"CompletionMenuController" bundle:[NSBundle mainBundle]];
        completionMenuPopover = [[NSPopoverInformation alloc] init];
        [completionMenuPopover setContentViewController: completionController];
        [completionMenuPopover setContentSize: completionController.view.frame.size];
        [completionMenuPopover setBehavior: NSPopoverBehaviorTransient];
        [completionMenuPopover setAppearance: NSPopoverAppearanceHUD];
        [completionMenuPopover showRelativeToRect:[_commandBar frame] ofView:_commandBar preferredEdge:NSMaxYEdge];
    }
}

Answer 1

这是一种解决方法，不完全是我试图实现这一目标的方式，但它确实有效。我在打开弹出框之前将光标位置保存在文本字段中，然后给文本字段第一个响应者并将光标位置更改回原来的位置。

if ([_commandBar stringValue].length > 0){
    NSString *command   = [_commandBar stringValue];
    NSRange range       = [[_commandBar currentEditor] selectedRange];

    //Open popover if command is being typed
    if ([[command substringFromIndex: command.length - 1] isEqualToString: @"#"]){
        CompletionMenuController *completionController = [[CompletionMenuController alloc] initWithNibName: @"CompletionMenuController" bundle:[NSBundle mainBundle]];

        //Configure and Open Popover
        if ([completionMenuPopover isShown]) [completionMenuPopover close];
        completionMenuPopover = [[NSPopover alloc] init];
        [completionMenuPopover setContentViewController: completionController];
        [completionMenuPopover setContentSize: completionController.view.frame.size];
        [completionMenuPopover setBehavior: NSPopoverBehaviorTransient];
        [completionMenuPopover setAppearance: NSPopoverAppearanceHUD];
        [completionMenuPopover setAnimates: NO];
        [completionMenuPopover showRelativeToRect:[_commandBar frame] ofView:_commandBar preferredEdge:NSMaxYEdge];

        //Reset Command Bar as First Responder
        [_commandBar becomeFirstResponder];
        [[_commandBar currentEditor] setSelectedRange: range];
    }
}

Answer 2

NSPopover的自动关闭似乎取决于检测焦点变化。这意味着如果它是瞬态的，它需要将第一个响应者状态设置为弹出窗口。试试NSPopoverBehaviorApplicationDefined，看看是否能解决焦点问题。但是，你必须小心地关闭弹出窗口。然而，如果没有别的办法，那么将focs显式地设置到编辑控件也是一种可能的选择。显示弹出窗口不会改变视觉外观，因此短焦点开关不会闪烁。

显示没有焦点的NSPopover

2 个答案: