如何在 NSTextView 中禁用这些键盘快捷键？

发布于 2024-12-16 18:53:57 字数 215 浏览 3 评论 0原文

我有一个 NSTextView，我将其用作字母的全屏画布。

以下组合键执行了我不想执行的操作（例如隐藏窗口、锁定计算机）。

我怎样才能禁用它们以阻止它们被调用？

Command-a
Command-h
Command-j
Command-p
Command-u

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眉目亦如画i 2024-12-23 18:53:58

首先，请确保您了解关键事件路径和用户界面验证。

我认为禁用您提到的操作的最佳方法是通过子类化 NSTextView 并通过声明您的文本视图符合 NSUserInterfaceValidations 并编写验证方法来禁用其关联的菜单项：

- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)anItem {

    SEL action = [anItem action];
    if (@selector(selectAll:) == action ||                    // command-a
        @selector(centerSelectionInVisibleArea:) == action || // command-j
        @selector(print:) == action ||                        // command-p
        @selector(underline:) == action) {                    // command-u

        return NO;
    }
    else return [super validateUserInterfaceItem:anItem];
}

但这并不能阻止用户通过 Command+H 隐藏应用程序。要禁用该组合键，您可以在 MainMenu XIB 中删除其等效键，也可以继承 NSApplication 并覆盖 hide:

First, make sure you understand the path of key events and user interface validation.

I think the best way to disable the actions you mention is by subclassing NSTextView and disabling their associated menu items by declaring your text view as conforming to NSUserInterfaceValidations and writing the validation method:

- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)anItem {

    SEL action = [anItem action];
    if (@selector(selectAll:) == action ||                    // command-a
        @selector(centerSelectionInVisibleArea:) == action || // command-j
        @selector(print:) == action ||                        // command-p
        @selector(underline:) == action) {                    // command-u

        return NO;
    }
    else return [super validateUserInterfaceItem:anItem];
}

However that doesn't prevent the user from hiding the app via Command+H. To disable that key combo you can either remove its key equivalent in the MainMenu XIB, or you can subclass NSApplication and override hide:

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