在Love2D的超类中调用覆盖方法

Question

如何从Love2D中的子类调用超类中的覆盖方法？

Sprite = {}
function Sprite:new(x, y, image)
    local self = {}
    self.x = x
    self.y = y
    self.image = image

    function self:draw()
        love.graphics.draw(self.image, self.x, self.y)
    end
    return self
end

ExplorerWindow = {}
function ExplorerWindow:new(x, y, image)
    local self = Sprite:new(x, y, image)

    function self:draw()
        -- Here I want to call draw in Sprite
    end
    return self
end

function love.load()
    explorerWindow = ExplorerWindow:new(200, 200, love.graphics.newImage("res/window.png"))
end

function love.draw()
    explorerWindow:draw()
end

Answer 1

将旧函数存储在临时变量中。

function ExplorerWindow:new(x, y, image)
    local self = Sprite:new(x, y, image)
    local oldDraw = self.draw

    function self:draw()
        oldDraw(self)
    end
    return self
end

另外，请相应地使用setmetatable。