ToolStripItem.DragDrop 事件

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

当用户拖动某项后再释放鼠标按钮时发生，指示此项应该被放入该项内。

public:
 event System::Windows::Forms::DragEventHandler ^ DragDrop;

[System.ComponentModel.Browsable(false)]
public event System.Windows.Forms.DragEventHandler DragDrop;

[<System.ComponentModel.Browsable(false)>]
member this.DragDrop : System.Windows.Forms.DragEventHandler 

Public Custom Event DragDrop As DragEventHandler 

事件类型

DragEventHandler

属性

BrowsableAttribute

示例

下面的代码示例演示如何将 X 和 Y 属性转换为客户端 Point。 此代码示例是为类提供的大型示例的 ToolStripRenderer 一部分。

// This method defines the DragOver event behavior. 
protected override void OnDragOver(DragEventArgs dea)
{
    base.OnDragOver(dea);

    // Get the ToolStripButton control 
    // at the given mouse position.
    Point p = new Point(dea.X, dea.Y);
    ToolStripButton item = this.GetItemAt(
        this.PointToClient(p)) as ToolStripButton;

    // If the ToolStripButton control is the empty cell,
    // indicate that the move operation is valid.
    if( item == this.emptyCellButton )
    {
        // Set the drag operation to indicate a valid move.
        dea.Effect = DragDropEffects.Move;
    }
}

' This method defines the DragOver event behavior. 
Protected Overrides Sub OnDragOver(dea As DragEventArgs)
   MyBase.OnDragOver(dea)
   
   ' Get the ToolStripButton control 
   ' at the given mouse position.
   Dim p As New Point(dea.X, dea.Y)
   Dim item As ToolStripButton = CType(Me.GetItemAt(Me.PointToClient(p)), ToolStripButton)
   
   
   ' If the ToolStripButton control is the empty cell,
   ' indicate that the move operation is valid.
     If item Is Me.emptyCellButton Then
         ' Set the drag operation to indicate a valid move.
         dea.Effect = DragDropEffects.Move
     End If
 End Sub

注解

屏幕 X 坐标（而不是客户端坐标）的和 Y 属性 DragEventArgs 。 有关处理事件的详细信息，请参阅 “处理和引发事件”。