我创建了一个继承DataGridView
的自定义控件,以便拥有透明背景。现在我试图在计时器上设置一个滚动功能,每秒向下滚动一行。但是,当我尝试滚动(垂直)时,背景图像不固定。有什么方法可以在滚动时修复背景图像吗?
编辑:这是处理滚动计时器的代码。
Private Sub Sub1
'Some previous code
If DataGridView1.Rows.Count > 10 Then
ScrollIndex1 = 0 'Integer for scroll index
DGVAutoScroll()
End If
End Sub
Private Sub DGVAutoScroll()
Timer2.Enabled = True
Timer2.Interval = 1000
End Sub
Private Sub Timer2_Tick(sender As Object, e As EventArgs) Handles Timer2.Tick
If ScrollIndex1 = DataGridView1.Rows.Count - 1 Then
ScrollIndex1 = 0
DataGridView1.FirstDisplayedScrollingRowIndex = ScrollIndex1
ScrollIndex1 += 1
Else
DataGridView1.FirstDisplayedScrollingRowIndex = ScrollIndex1
ScrollIndex1 += 1
End If
End Sub
'Custom DataGridView class
Imports System.ComponentModel
Imports System.Windows.Forms
Public Class MyDGV
Inherits DataGridView
Public Property DGVHasTransparentBackground As Boolean
Get
Return Nothing
End Get
Set()
SetTransparentProperties(True)
End Set
End Property
Public Property ScrollBar
Get
Return Nothing
End Get
Set(value)
BackgroundColor = Color.Transparent
End Set
End Property
Public Sub New()
DGVHasTransparentBackground = True
End Sub
Private Sub SetTransparentProperties(ByRef SetAsTransparent As Boolean)
MyBase.DoubleBuffered = True
MyBase.EnableHeadersVisualStyles = False
MyBase.ColumnHeadersDefaultCellStyle.BackColor = Color.Transparent
MyBase.RowHeadersDefaultCellStyle.BackColor = Color.Transparent
SetCellStyle(Color.Transparent)
End Sub
Protected Overrides Sub PaintBackground(graphics As System.Drawing.Graphics, clipBounds As System.Drawing.Rectangle, gridBounds As System.Drawing.Rectangle)
MyBase.PaintBackground(graphics, clipBounds, gridBounds)
Dim rectSource As New Rectangle(MyBase.Location, MyBase.Size)
Dim rectDest As New Rectangle(0, 0, rectSource.Width, rectSource.Height)
Dim b As New Bitmap(Parent.ClientRectangle.Width, Parent.ClientRectangle.Height)
Graphics.FromImage(b).DrawImage(MyBase.Parent.BackgroundImage, Parent.ClientRectangle)
graphics.DrawImage(b, rectDest, rectSource, GraphicsUnit.Pixel)
End Sub
Protected Overrides Sub OnColumnAdded(e As System.Windows.Forms.DataGridViewColumnEventArgs)
MyBase.OnColumnAdded(e)
SetCellStyle(Color.Transparent)
End Sub
Private Sub SetCellStyle(ByVal cellColour As Color)
For Each col As DataGridViewColumn In MyBase.Columns
col.DefaultCellStyle.BackColor = cellColour
col.DefaultCellStyle.SelectionBackColor = cellColour
Next
End Sub
End Class
答案 0 :(得分:5)
看起来我必须在计时器滴答声中调用DataGridView1.SelectAll()。谢谢大家。
答案 1 :(得分:0)
我假设你想要一个数据背后的图像( datagridview )。
如果 datagridview 是透明的,那么只需在后台添加图片。将其粘贴在表单上或 datagridview 后面的项目上。它不会滚动,因为它将在 datagridview
之外如果数据不清晰可见,则更改图像alpha。