使用Lua检测键盘按键组合 [英] Using Lua to detect a combination of keyboard key presses

问题描述

我正在编写《魔兽世界》附加组件，我希望该附加组件能够基于按键或按键组合来执行某些功能.现在，大多数关键状态都已受保护的WoW API函数，但附加组件仍可以使用以下功能:

I'm in the middle of writing a World of Warcraft addon and I want the addon to be able to perform certain functions based on a key press or a combination of key presses. Most of the key states are protected WoW API functions now but the following are still able to be used by addons:

IsAltKeyDown()
IsControlKeyDown()
IsShiftKeyDown()

我想做的就是根据这些按键中的任何一个或按键的组合来执行功能.

What I'd like to be able to do is perform a function based on any one of those keys down or a combination there of.

这就是我正在工作的:

function KeyCombos()
    total = 0
    if IsShiftKeyDown() then
        total = total + 1
    end
    if IsControlKeyDown() then
        total = total + 2
    end
    if IsAltKeyDown() then
        total = total + 4
    end
end

现在我的问题不一定是关于Lua的，因为上面的函数正在起作用，因此我可以检查总计是否等于6，例如查看是否同时按下了Control和Alt.我的问题更多是算法问题.有没有更好的方法以编程方式执行此操作?

Now my question isn't necessarily about Lua, as the above function is working as I can check if total equals 6 for example to see if Control and Alt are both pressed. My question is more of an algorithmic one. Is there a better way to perform this programmaticly?

推荐答案

如果要使用表，通常情况下，保持相同的表会更好.

If you are going to use a table, in the general case it would be much better to keep the same table.

function KeyCombos()
    keys = keys or {}

    keys.shift = IsShiftKeyDown()
    keys.control = IsControlKeyDown()
    keys.alt = IsAltKeyDown()
end

或者，如果您愿意

function KeyCombos()
    if not keys then
        keys = {}
    end

    keys.shift = IsShiftKeyDown()
    keys.control = IsControlKeyDown()
    keys.alt = IsAltKeyDown()
end

问题中的原始示例在使用整数数学时性能更高.

The original example in the question, however, is much more performant using integer math.

但是这些示例都创建了全局变量.所以:

However these examples all create globals. So:

function GetKeyCombos()
    local keys = 0

    if IsShiftKeyDown() then
        keys = keys + 1
    end
    if IsControlKeyDown() then
        keys = keys + 2
    end
    if IsAltKeyDown() then
        keys = keys + 4
    end

    return keys
end

会好得多.在《魔兽世界》中，所有插件都共享相同的全局环境，因此最好保持其清洁.

would be much better. In WoW all AddOns share the same global environment so its best to keep it clean.

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