為 vba 中的用戶定義類型創建屬性

Question

我正在嘗試在 VBA 中創建我的第一個用戶定義類型，但我被困在這里。 我想在我的類型中添加一個“區域”屬性：

Public Type My_Node
    x As Double
    y As Double
    w As Double
    h As Double
    used As Boolean
    area As Double
    area = w * h
End Type

為了這樣稱呼它：

Dim node as My_Node
Dim surface as double
surface = node.area

我認為這不是很正確，但我找不到如何實現它！

Answer 1

謝謝你的評論，這對我理解有很大幫助。 這是我的最后一次更新，效果很好：

Public x As Double
Public y As Double
Public w As Double
Public h As Double
Public used As Boolean

Public Property Get Area() As Double
    Area = w * h
End Property

是的，我可以在外部制作它，但如果我知道如何做到這一點，它將來對我有用！ 謝謝 ！

Answer 2

對於 OPs anwser，您確實需要所有這些公共字段的屬性。 您可能會認為這是很多樣板文本，收效甚微。 但它將允許您驗證輸入。 通過為 VBA 提供免費且出色的 Rubberduck 插件，重構完全消除了樣板文件的乏味。

只需單擊幾下，封裝字段重構就會將 OP 答案中的代碼更改為

Private Type TClass1
    X As Double
    Y As Double
    W As Double
    H As Double
    Used As Boolean
    Surface As Double
End Type

Private this As TClass1

Public Property Get X() As Double
    X = this.X
End Property

Public Property Let X(ByVal RHS As Double)
    this.X = RHS
End Property

Public Property Get Y() As Double
    Y = this.Y
End Property

Public Property Let Y(ByVal RHS As Double)
    this.Y = RHS
End Property

Public Property Get W() As Double
    W = this.W
End Property

Public Property Let W(ByVal RHS As Double)
    this.W = RHS
End Property

Public Property Get H() As Double
    H = this.H
End Property

Public Property Let H(ByVal RHS As Double)
    this.H = RHS
End Property

Public Property Get Used() As Boolean
    Used = this.Used
End Property

Public Property Let Used(ByVal RHS As Boolean)
    this.Used = RHS
End Property

Public Property Get Surface() As Double
    Surface = this.Surface
End Property

Public Property Let Surface(ByVal RHS As Double)
    this.Surface = RHS
End Property

Public Property Get Area() As Integer
    Area = W * H
End Property