如何将菜单放入 rebol 列表 (VID)?

How do I put a menu in a rebol list (VID)?

我在 Rebol2 中有一个 VID 列表,我想使其中一列成为某种菜单,从中我可以 select 从一组选项中选择一个值。我使用的代码基于 list-widget-example.r。选择集是动态的。

我尝试将 "choice" 和 "rotary" 与一组静态选项一起使用,但效果不佳。使用 "choice" 总是使用第一个值并且 "rotary" 弹出一个黑色 window.

这是一个相当初级的示例,展示了如何使用 CHOICE 菜单 在视频列表中。

https://s3-ap-southeast-1.amazonaws.com/antonrolls/rebol/gui/iterated/demo-list-of-texts-with-context-menu.r

(为了完整起见,我粘贴了代码,但我没有完全阅读其他答案,抱歉。请忽略此编辑。对于 mess/noise/disturbance,我深表歉意。)

这里是 @AntonRolls code 的精简版,明确回答了这个问题。即"a fairly rudimentary example which shows how to use a CHOICE menu in a VID LIST."

members: [ {Gandalf} {Bilbo} {Frodo} ]
db: [
    ["1" "question 1 " "default1"]
    ["2" "question 2"  ""]
    ["3" "question 3"  "default3"]
]
view out: layout [
    mylist: list 450x240 [
        across 
        t1: text 50x20
        t2: text 200x20 para [wrap?: true] 
        t3: text 200x20 effect [merge luma 10] font [] [
        ][
            ; alt-action (right-click action)
            use [row][
                if row: face/user-data [ ; face knows index
                    choose/window/offset members func [face value][
                        poke db/:row 3 face/text
                    ] out (
                        mylist/offset + (t3/offset * 1x0) 
                        + (row - 1 * t3/size * 0x1)
                    )
                ]
            ]
        ]
    ] supply [
        either count <= length? db [
            face/user-data: count ; store row index
            switch index [
                1 [face/text: db/:count/1]
                2 [face/text: db/:count/2]
                3 [face/text: db/:count/3]
            ]
        ][
            face/user-data: face/text: none
        ]
    ]