讲述VB.NET实现拖动图片
环境:windows7,vb2010 Public Class Form1 Private m_MouseIsDown As Boolean Private Sub Form1_Load(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles MyBase.Load PictureBox2.AllowDrop = True PictureBox1.AllowDrop = True End Sub Private Sub PictureBox1_MouseDown(ByVal sender As Object,ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown If Not PictureBox1.Image Is nothing Then ' Set a flag to show that the mouse is down. m_MouseIsDown = True End If End Sub Private Sub PictureBox1_MouseMove(ByVal sender As Object,ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseMove If m_MouseIsDown Then ' Initiate dragging and allow either copy or move. PictureBox1.DoDragDrop(PictureBox1.Image,DragDropEffects.copy Or DragDropEffects.Move) End If m_MouseIsDown = False End Sub Private Sub PictureBox2_DragDrop(ByVal sender As Object,ByVal e As System.Windows.Forms.DragEventArgs) Handles PictureBox2.DragDrop ' Assign the image to the PictureBox. PictureBox2.Image = e.Data.GetData(DataFormats.Bitmap) ' If the CTRL key is not pressed,delete the source picture. If Not e.KeyState = 8 Then PictureBox1.Image = nothing End If End Sub Private Sub PictureBox2_dragenter(ByVal sender As Object,ByVal e As System.Windows.Forms.DragEventArgs) Handles PictureBox2.dragenter If e.Data.GetDataPresent(DataFormats.Bitmap) Then ' Check for the CTRL key. If e.KeyState = 9 Then e.Effect = DragDropEffects.copy Else e.Effect = DragDropEffects.Move End If Else e.Effect = DragDropEffects.None End If End Sub End Class
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