如何实现一个按钮，其功能是单选按钮和检查按钮之间的交叉？ [英] How to implement a button whose functionality is a cross between radiobutton and checkbutton?

问题描述

我想基于用户选择的选项动态禁用或启用检查按钮。我想要的是 radiobutton 和 checkbutton 之间的交叉。

I want to dynamically disable or enable checkbuttons based on the options the user selects. What I would like is a cross between radiobutton and checkbutton.

checkbutton .c1 -text "C1" -variable c1
checkbutton .c2 -text "C2" -variable c2
checkbutton .c3 -text "C3" -variable c3
checkbutton .c4 -text "C4" -variable c4

grid .c1 -sticky w
grid .c2 -sticky w
grid .c3 -sticky w
grid .c4 -sticky w

上面的例子，如果我检查 C1 ，那么选项 C2 和 C4 应该是灰色的。
同样，如果我检查 C3 ，那么 C4 应该是灰色的。

In the above example, if I check C1, then the options C2 and C4 should be grayed out. Similarly, if I check C3 then C4 should be grayed out.

如果有一个优雅的方法在 radiobutton 和

It would be great if there is an elegant method which implements this cross between radiobutton and checkbutton which also scales well as the number of options increases?

推荐答案

到目前为止，最简单的机制用于实现启用和禁用的复杂模式是在触发器变量（ c1 和<$ c）上放置跟踪

By far the simplest mechanism for implementing that complex pattern of enabling and disabling is to put a trace on the trigger variables (c1 and c3 in your example) so that whenever they change you recompute the states.

# _After_ initializing the state...
trace add variable c1 write reconfigureButtons
trace add variable c3 write reconfigureButtons
proc reconfigureButtons args {
    global c1 c3
    .c2 configure -state [expr {$c1      ? "disabled" : "normal"}]
    .c4 configure -state [expr {$c1||$c3 ? "disabled" : "normal"}]
}

一个控制器关闭模型，而不是关闭视图作为更多的标准 - 我们通常不谈论MVC的Tk，因为Tk自带的内置控制器的最基本的工作 - 但它一切正常 -

(Conceptually, you're hanging a piece of the Controller off the Model instead of off the View as is more "standard" — we don't normally talk in terms of MVC for Tk because Tk comes with built-in Controllers for most basic work — but it all works straight-forwardly and you can set it up once and not fiddle around with it afterwards.)

但是，不要混淆checkbuttons和radiobuttons（因为你的问题文本似乎表明）。请。这是因为他们为用户提供了不同的视觉提示：检查按钮是开关，单选按钮选择其中一个，使用任何其他方式将只是使事情难以使用没有其他好处。

However, don't mix up checkbuttons and radiobuttons (as your question text seems to indicate). Please. That's because they offer different visual cues to users: checkbuttons are on-off switches, radiobuttons are "pick one of these", and using them any other way will just make things harder to use for no other benefit.

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