如何启用/禁用NSToolbarItem [英] how to enable/disable NSToolbarItem

问题描述

我有一个项目需要禁用/启用某些NSToolbarItem，具体取决于不同的选项.我检查后发现没有参数.

I have a project that needs to disable/enable some NSToolbarItems depends on different options. I checked and found no parameter for this.

是否可以启用/禁用给定的NSToolbarItem?

Is there a way to enable/disable a given NSToolbarItem?

推荐答案

在窗口，视图或文档控制器中实施NSToolbarItemValidation协议.该文档提供了以下示例代码:

Implement NSToolbarItemValidation Protocol in your window, view or document controller. The documentation gives the following sample code:

-(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;
}

您还可以使用action或tag确定要验证的工具栏项目.每当激活您的应用程序或调度事件时，项目都会被频繁验证，因此它们将始终处于有效状态.

You can also use action or tag to determine what toolbar item is being validated. Items are validated frequently, whenever your app is activated or events are dispatched, so they will always be in a valid state.

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