Public Class frmMain
#Region " Constants "
Private Enum DGVHeaderImageAlignments As Int32
[Default] = 0
FillCell = 1
SingleCentered = 2
SingleLeft = 3
SingleRight = 4
Stretch = [Default]
Tile = 5
End Enum
#End Region
#Region " Events "
#Region " Handlers "
Private Sub dgvData_CellPainting(ByVal sender As Object, _
ByVal e As DataGridViewCellPaintingEventArgs) _
Handles dgvData.CellPainting
' Only the Header Row (which Index is -1) is to be affected.
If e.RowIndex = -1 Then
GridDrawCustomHeaderColumns(dgvData, e, _
My.Resources.Button_Gray_Stripe_01_050, _
DGVHeaderImageAlignments.Stretch)
'GridDrawCustomHeaderColumns(dgvData, e, _
' My.Resources.AquaBall_Blue, DGVHeaderImageAlignments.FillCell)
'GridDrawCustomHeaderColumns(dgvData, e, _
' My.Resources.AquaBall_Blue, _
' DGVHeaderImageAlignments.SingleCentered)
'GridDrawCustomHeaderColumns(dgvData, e, _
' My.Resources.AquaBall_Blue, DGVHeaderImageAlignments.SingleLeft)
'GridDrawCustomHeaderColumns(dgvData, e, _
' My.Resources.AquaBall_Blue, DGVHeaderImageAlignments.SingleRight)
'GridDrawCustomHeaderColumns(dgvData, e, _
' My.Resources.AquaBall_Blue, DGVHeaderImageAlignments.Tile)
End If
End Sub
Private Sub frmMain_Load(ByVal sender As Object, ByVal e As EventArgs) _
Handles Me.Load
' Init.
' Set up the Header Color and Font.
With dgvData.ColumnHeadersDefaultCellStyle
.Alignment = DataGridViewContentAlignment.TopRight
.BackColor = Color.DarkRed
.ForeColor = Color.Gold
.Font = New Font(.Font.FontFamily, .Font.Size, _
.Font.Style Or FontStyle.Bold, GraphicsUnit.Point)
End With
' Fill in some Text.
For i As Int32 = 0 To 20
Dim arrStrings As String()
arrStrings = New String() _
{ _
i.ToString, "Text " & i.ToString, i.ToString, _
"Text " & i.ToString, i.ToString _
}
dgvData.Rows.Add(arrStrings)
arrStrings = Nothing
Next i
End Sub
#End Region
#End Region
#Region " Methods "
Private Sub GridDrawCustomHeaderColumns(ByVal dgv As DataGridView, _
ByVal e As DataGridViewCellPaintingEventArgs, ByVal img As Image, _
ByVal Style As DGVHeaderImageAlignments)
' All of the graphical Processing is done here.
Dim gr As Graphics = e.Graphics
' Fill the BackGround with the BackGroud Color of Headers.
' This step is necessary, for transparent images, or what's behind
' would be painted instead.
gr.FillRectangle( _
New SolidBrush(dgv.ColumnHeadersDefaultCellStyle.BackColor), _
e.CellBounds)
If img IsNot Nothing Then
Select Case Style
Case DGVHeaderImageAlignments.FillCell
gr.DrawImage( _
img, e.CellBounds.X, e.CellBounds.Y, _
e.CellBounds.Width, e.CellBounds.Height)
Case DGVHeaderImageAlignments.SingleCentered
gr.DrawImage(img, _
((e.CellBounds.Width - img.Width) \ 2) + e.CellBounds.X, _
((e.CellBounds.Height - img.Height) \ 2) + e.CellBounds.Y, _
img.Width, img.Height)
Case DGVHeaderImageAlignments.SingleLeft
gr.DrawImage(img, e.CellBounds.X, _
((e.CellBounds.Height - img.Height) \ 2) + e.CellBounds.Y, _
img.Width, img.Height)
Case DGVHeaderImageAlignments.SingleRight
gr.DrawImage(img, _
(e.CellBounds.Width - img.Width) + e.CellBounds.X, _
((e.CellBounds.Height - img.Height) \ 2) + e.CellBounds.Y, _
img.Width, img.Height)
Case DGVHeaderImageAlignments.Tile
' ********************************************************
' To correct: It sould display just a stripe of images,
' long as the whole header, but centered in the header's
' height.
' This code WON'T WORK.
' Any one got any better solution?
'Dim rect As New Rectangle(e.CellBounds.X, _
' ((e.CellBounds.Height - img.Height) \ 2), _
' e.ClipBounds.Width, _
' ((e.CellBounds.Height \ 2 + img.Height \ 2)))
'Dim br As New TextureBrush(img, Drawing2D.WrapMode.Tile, _
' rect)
' ********************************************************
' This one works... but poorly (the image is repeated
' vertically, too).
Dim br As New TextureBrush(img, Drawing2D.WrapMode.Tile)
gr.FillRectangle(br, e.ClipBounds)
Case Else
gr.DrawImage( _
img, e.CellBounds.X, e.CellBounds.Y, _
e.ClipBounds.Width, e.CellBounds.Height)
End Select
End If
'e.PaintContent(e.CellBounds)
If e.Value Is Nothing Then
e.Handled = True
Return
End If
Using sf As New StringFormat
With sf
Select Case dgv.ColumnHeadersDefaultCellStyle.Alignment
Case DataGridViewContentAlignment.BottomCenter
.Alignment = StringAlignment.Center
.LineAlignment = StringAlignment.Far
Case DataGridViewContentAlignment.BottomLeft
.Alignment = StringAlignment.Near
.LineAlignment = StringAlignment.Far
Case DataGridViewContentAlignment.BottomRight
.Alignment = StringAlignment.Far
.LineAlignment = StringAlignment.Far
Case DataGridViewContentAlignment.MiddleCenter
.Alignment = StringAlignment.Center
.LineAlignment = StringAlignment.Center
Case DataGridViewContentAlignment.MiddleLeft
.Alignment = StringAlignment.Near
.LineAlignment = StringAlignment.Center
Case DataGridViewContentAlignment.MiddleRight
.Alignment = StringAlignment.Far
.LineAlignment = StringAlignment.Center
Case DataGridViewContentAlignment.TopCenter
.Alignment = StringAlignment.Center
.LineAlignment = StringAlignment.Near
Case DataGridViewContentAlignment.TopLeft
.Alignment = StringAlignment.Near
.LineAlignment = StringAlignment.Near
Case DataGridViewContentAlignment.TopRight
.Alignment = StringAlignment.Far
.LineAlignment = StringAlignment.Near
End Select
' This part could be handled...
'Select Case dgv.ColumnHeadersDefaultCellStyle.WrapMode
' Case DataGridViewTriState.False
' .FormatFlags = StringFormatFlags.NoWrap
' Case DataGridViewTriState.NotSet
' .FormatFlags = StringFormatFlags.NoWrap
' Case DataGridViewTriState.True
' .FormatFlags = StringFormatFlags.FitBlackBox
'End Select
.HotkeyPrefix = Drawing.Text.HotkeyPrefix.None
.Trimming = StringTrimming.None
End With
With dgv.ColumnHeadersDefaultCellStyle
gr.DrawString(e.Value.ToString, .Font, _
New SolidBrush(.ForeColor), e.CellBounds, sf)
End With
End Using
e.Handled = True
End Sub
#End Region
End Class
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