c# - 如何从一个面板拖放(复制)到另一个面板

Question

我在一个表单上有两个面板。
一个面板有一些控件，如按钮或图像，第二个面板是空的。我想从面板 1 拖动一个控件并将其放到面板 2，但它应该创建控件的副本，并且在拖动矩形时应显示与控件相同的大小，而当拖放到面板 2 中时，拖动的形状应该出现在那里在鼠标位置
其实我想创建一个模拟器之类的东西。在面板 1 中有一些工具，当有人将工具拖放到面板 2 上时，它应该出现在鼠标位置。

语言无关紧要可能是 C# 或 VB.NET

Answer 1

你试过这样的事情吗？

private void Form5_Load(object sender, EventArgs e)  
{  
    this.panel1.AllowDrop = true;  
    foreach (Control c in this.panel1.Controls)  
    {  
        c.MouseDown += new MouseEventHandler(c_MouseDown);  
    }  
    this.panel1.DragOver += new DragEventHandler(panel1_DragOver);  
    this.panel1.DragDrop += new DragEventHandler(panel1_DragDrop);  
}  

void c_MouseDown(object sender, MouseEventArgs e)  
{  
    Control c = sender as Control;  
    c.DoDragDrop(c, DragDropEffects.Move);  
}  

void panel1_DragDrop(object sender, DragEventArgs e)  
{  
    Control c = e.Data.GetData(e.Data.GetFormats()[0]) as Control;  
    if (c != null)  
    {  
        c.Location = this.panel1.PointToClient(new Point(e.X, e.Y));  
        this.panel1.Controls.Add(c);  
    }  
}  

void panel1_DragOver(object sender, DragEventArgs e)  
{  
    e.Effect = DragDropEffects.Move;  
}  

VB.Net

Private Sub Form5_Load(sender As Object, e As EventArgs)
    Me.panel1.AllowDrop = True
    For Each c As Control In Me.panel1.Controls
        c.MouseDown += New MouseEventHandler(AddressOf c_MouseDown)
    Next
    Me.panel1.DragOver += New DragEventHandler(AddressOf panel1_DragOver)
    Me.panel1.DragDrop += New DragEventHandler(AddressOf panel1_DragDrop)
End Sub

Private Sub c_MouseDown(sender As Object, e As MouseEventArgs)
    Dim c As Control = TryCast(sender, Control)
    c.DoDragDrop(c, DragDropEffects.Move)
End Sub

Private Sub panel1_DragDrop(sender As Object, e As DragEventArgs)
    Dim c As Control = TryCast(e.Data.GetData(e.Data.GetFormats()(0)), Control)
    If c IsNot Nothing Then
        c.Location = Me.panel1.PointToClient(New Point(e.X, e.Y))
        Me.panel1.Controls.Add(c)
    End If
End Sub

Private Sub panel1_DragOver(sender As Object, e As DragEventArgs)
    e.Effect = DragDropEffects.Move
End Sub

Source