itk_option remove

最新推荐文章于 2020-04-15 23:51:12 发布

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最新推荐文章于 2020-04-15 23:51:12 发布

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原文链接：http://www.cnblogs.com/greencolor/archive/2011/06/16/2083136.html

本文详细介绍了 itk_optionremove 命令的使用方法及其在 mega-widget 中的作用。通过示例展示了如何利用该命令移除已定义的选项，并重新定义以实现对基类选项的覆盖。

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itk_option remove optName ?optName optName ...? Removes one or more options from the composite option list for a mega-widget. Here, optName can have one of the forms described above for the "itk_option add" command.
Options are normally integrated into the composite option list when a component widget is first created. This method can be used to remove options at a later time. For example, a derived class can override an option defined in a base class by removing and redefining the option:

itcl::class Base {
    inherit itk::Widget
    constructor {args} {
        eval itk_initialize $args
    }

    itk_option define -foo foo Foo "" {
        puts "Base: $itk_option(-foo)"
    }
}

itcl::class Derived {
    inherit Base

    constructor {args} {
        itk_option remove Base::foo
        eval itk_initialize $args
    }
    itk_option define -foo foo Foo "" {
        puts "Derived: $itk_option(-foo)"
    }
}

Without the "itk_option remove" command, the code fragments for both of the "-foo" options would be executed each time the composite "-foo" option is configured. In the example above, the Base::foo option is suppressed in all Derived class widgets, so only the Derived::foo option remains.

转载于:https://www.cnblogs.com/greencolor/archive/2011/06/16/2083136.html