[英]How can I add events to a dynamically created PictureBox? (Visual Basic)
[英]How can I respond to events raised by programmatically created UI elements?
我正在為一個課程作業創建一個棋盤游戲。 對於電路板,我使用了一些嵌套的 For 循環,它運行在一個 2D 數組中,以在每個方塊上生成一個“空間”對象。
Space 對象包含一個圖片框和有關該空間的一些數據。
如何處理由單擊生成的圖片框引起的事件,而不必為每個空間對其進行硬編碼?
我注意到這個問題似乎解決了這個問題,但它是在 C# 中的,我無法將其轉換為 VB.Net。
編輯:這就是板的生成方式
Dim board(23, 24) As Space
Private Sub GenerateBoard()
Dim spaceSize As New Size(30, 30)
Dim spaceLocation As New Point
Dim validity As Boolean
For Y = 0 To 24
For X = 0 To 23
spaceLocation.X = 6 + (31 * X)
spaceLocation.Y = 6 + (31 * Y)
If validSpaces(Y).Contains(X + 1) Then
validity = True
Else
validity = False
End If
board(X, Y) = New Space(validity, spaceSize, spaceLocation)
Me.Controls.Add(board(X, Y).imageBox)
board(X, Y).imageBox.BackColor = Color.Transparent
board(X, Y).imageBox.BringToFront()
Next
Next
End Sub
空間類:
Public Class Space
Dim _active As Boolean
Dim _imageBox As PictureBox
Public Sub New(ByVal activeInput As Boolean, ByVal size As Size, ByVal location As Point)
_active = activeInput
_imageBox = New PictureBox
With _imageBox
.Size = size
.Location = location
.Visible = False
End With
End Sub
Property active As Boolean
Get
Return _active
End Get
Set(value As Boolean)
_active = value
End Set
End Property
Property imageBox As PictureBox
Get
Return _imageBox
End Get
Set(value As PictureBox)
_imageBox = value
End Set
End Property
Public Sub highlight()
With _imageBox
.Image = My.Resources.Highlighted_slab
.Visible = True
End With
End Sub
End Class
首先由設計器(文本框,標簽...)創建的所有控件也是由代碼生成的,但是 VisualStudio 為您編寫了這個。 如果您打開設計器文件( yourForm.Designer.vb
),那么您可以看到如何生成控件的所有代碼。
如果你想為你的pictureBox
創建一個事件處理程序,那么:
//Initialize control
Private WithEvents _imageBox as PictureBox
然后創建一個事件處理程序方法:
Private Sub imageBox_Click(sender as Object, e as EventArgs)
//Your code
End Sub
然后在 VB.NET 中,您可以通過兩種方式為事件分配事件處理程序
第一:在創建New PictureBox()
后的類構造函數中( New PictureBox()
)添加
AddHandler Me._imageBox, AddressOf Me.imageBox_Click
第二:在線我們創建了一個事件處理程序添加下一個:
Private Sub imageBox_Click(sender as Object, e as EventArgs) Handles _imageBox.Click
//Your code
End Sub
並記住將您的YourForm.Controls.Add(spaceInstance.ImageBox)
添加到表單控件YourForm.Controls.Add(spaceInstance.ImageBox)
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