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Imports System
Imports System.Drawing
Imports System.Windows.Forms
Class DataGridViewRowPainting
Inherits Form
Private WithEvents dataGridView1 As New DataGridView()
Private oldRowIndex As Int32 = 0
Private Const CUSTOM_CONTENT_HEIGHT As Int32 = 30
<STAThreadAttribute()> _
Public Shared Sub Main()
Application.Run(New DataGridViewRowPainting())
End Sub 'Main
Public Sub New()
Me.dataGridView1.Dock = DockStyle.Fill
Me.Controls.Add(Me.dataGridView1)
Me.Text = "DataGridView row painting demo"
End Sub 'New
Sub DataGridViewRowPainting_Load(ByVal sender As Object, _
ByVal e As EventArgs) Handles Me.Load
' Set a cell padding to provide space for the top of the focus
' rectangle and for the content that spans multiple columns.
Dim newPadding As New Padding(0, 1, 0, CUSTOM_CONTENT_HEIGHT)
Me.dataGridView1.RowTemplate.DefaultCellStyle.Padding = newPadding
' Set the selection background color to transparent so
' the cell won't paint over the custom selection background.
Me.dataGridView1.RowTemplate.DefaultCellStyle.SelectionBackColor = _
Color.Transparent
' Set the row height to accommodate the normal cell content and the
' content that spans multiple columns.
Me.dataGridView1.RowTemplate.Height += CUSTOM_CONTENT_HEIGHT
' Initialize other DataGridView properties.
Me.dataGridView1.AllowUserToAddRows = False
Me.dataGridView1.EditMode = DataGridViewEditMode.EditOnKeystrokeOrF2
Me.dataGridView1.CellBorderStyle = DataGridViewCellBorderStyle.None
Me.dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect
' Set the column header names.
Me.dataGridView1.ColumnCount = 4
Me.dataGridView1.Columns(0).Name = "Recipe"
Me.dataGridView1.Columns(0).SortMode = _
DataGridViewColumnSortMode.NotSortable
Me.dataGridView1.Columns(1).Name = "Category"
Me.dataGridView1.Columns(2).Name = "Main Ingredients"
Me.dataGridView1.Columns(3).Name = "Rating"
' Hide the column that contains the content that spans
' multiple columns.
Me.dataGridView1.Columns(2).Visible = False
' Populate the rows of the DataGridView.
Dim row1() As String = {"Meatloaf", "Main Dish", _
"1 lb. lean ground beef, 1/2 cup bread crumbs, " + _
"1/4 cup ketchup, 1/3 tsp onion powder, 1 clove of garlic, " + _
"1/2 pack onion soup mix, dash of your favorite BBQ Sauce", "****"}
Dim row2() As String = {"Key Lime Pie", "Dessert", _
"lime juice, whipped cream, eggs, evaporated milk", "****"}
Dim row3() As String = {"Orange-Salsa Pork Chops", "Main Dish", _
"pork chops, salsa, orange juice, pineapple", "****"}
Dim row4() As String = {"Black Bean and Rice Salad", "Salad", _
"black beans, brown rice", "****"}
Dim row5() As String = {"Chocolate Cheesecake", "Dessert", _
"cream cheese, unsweetened chocolate", "***"}
Dim row6() As String = {"Black Bean Dip", "Appetizer", _
"black beans, sour cream, salsa, chips", "***"}
Dim rows() As Object = {row1, row2, row3, row4, row5, row6}
Dim rowArray As String()
For Each rowArray In rows
Me.dataGridView1.Rows.Add(rowArray)
Next rowArray
' Adjust the row heights to accommodate the normal cell content.
Me.dataGridView1.AutoResizeRows( _
DataGridViewAutoSizeRowsMode.AllCellsExceptHeaders)
End Sub 'DataGridViewRowPainting_Load
' Forces the control to repaint itself when the user
' manually changes the width of a column.
Sub dataGridView1_ColumnWidthChanged(ByVal sender As Object, _
ByVal e As DataGridViewColumnEventArgs) _
Handles dataGridView1.ColumnWidthChanged
Me.dataGridView1.Invalidate()
End Sub 'dataGridView1_ColumnWidthChanged
' Forces the row to repaint itself when the user changes the
' current cell. This is necessary to refresh the focus rectangle.
Sub dataGridView1_CurrentCellChanged(ByVal sender As Object, _
ByVal e As EventArgs) Handles dataGridView1.CurrentCellChanged
If oldRowIndex <> -1 Then
Me.dataGridView1.InvalidateRow(oldRowIndex)
End If
oldRowIndex = Me.dataGridView1.CurrentCellAddress.Y
End Sub 'dataGridView1_CurrentCellChanged
' Paints the custom selection background for selected rows.
Sub dataGridView1_RowPrePaint(ByVal sender As Object, _
ByVal e As DataGridViewRowPrePaintEventArgs) _
Handles dataGridView1.RowPrePaint
' Do not automatically paint the focus rectangle.
e.PaintParts = e.PaintParts And Not DataGridViewPaintParts.Focus
' Determine whether the cell should be painted with the
' custom selection background.
If (e.State And DataGridViewElementStates.Selected) = _
DataGridViewElementStates.Selected Then
' Calculate the bounds of the row.
Dim rowBounds As New Rectangle( _
Me.dataGridView1.RowHeadersWidth, e.RowBounds.Top, _
Me.dataGridView1.Columns.GetColumnsWidth( _
DataGridViewElementStates.Visible) - _
Me.dataGridView1.HorizontalScrollingOffset + 1, _
e.RowBounds.Height)
' Paint the custom selection background.
Dim backbrush As New _
System.Drawing.Drawing2D.LinearGradientBrush(rowBounds, _
Me.dataGridView1.DefaultCellStyle.SelectionBackColor, _
e.InheritedRowStyle.ForeColor, _
System.Drawing.Drawing2D.LinearGradientMode.Horizontal)
Try
e.Graphics.FillRectangle(backbrush, rowBounds)
Finally
backbrush.Dispose()
End Try
End If
End Sub 'dataGridView1_RowPrePaint
' Paints the content that spans multiple columns and the focus rectangle.
Sub dataGridView1_RowPostPaint(ByVal sender As Object, _
ByVal e As DataGridViewRowPostPaintEventArgs) _
Handles dataGridView1.RowPostPaint
' Calculate the bounds of the row.
Dim rowBounds As New Rectangle(Me.dataGridView1.RowHeadersWidth, _
e.RowBounds.Top, Me.dataGridView1.Columns.GetColumnsWidth( _
DataGridViewElementStates.Visible) - _
Me.dataGridView1.HorizontalScrollingOffset + 1, e.RowBounds.Height)
Dim forebrush As SolidBrush = Nothing
Try
' Determine the foreground color.
If (e.State And DataGridViewElementStates.Selected) = _
DataGridViewElementStates.Selected Then
forebrush = New SolidBrush(e.InheritedRowStyle.SelectionForeColor)
Else
forebrush = New SolidBrush(e.InheritedRowStyle.ForeColor)
End If
' Get the content that spans multiple columns.
Dim recipe As Object = _
Me.dataGridView1.Rows.SharedRow(e.RowIndex).Cells(2).Value
If (recipe IsNot Nothing) Then
Dim text As String = recipe.ToString()
' Calculate the bounds for the content that spans multiple
' columns, adjusting for the horizontal scrolling position
' and the current row height, and displaying only whole
' lines of text.
Dim textArea As Rectangle = rowBounds
textArea.X -= Me.dataGridView1.HorizontalScrollingOffset
textArea.Width += Me.dataGridView1.HorizontalScrollingOffset
textArea.Y += rowBounds.Height - e.InheritedRowStyle.Padding.Bottom
textArea.Height -= rowBounds.Height - e.InheritedRowStyle.Padding.Bottom
textArea.Height = (textArea.Height \ e.InheritedRowStyle.Font.Height) * _
e.InheritedRowStyle.Font.Height
' Calculate the portion of the text area that needs painting.
Dim clip As RectangleF = textArea
clip.Width -= Me.dataGridView1.RowHeadersWidth + 1 - clip.X
clip.X = Me.dataGridView1.RowHeadersWidth + 1
Dim oldClip As RectangleF = e.Graphics.ClipBounds
e.Graphics.SetClip(clip)
' Draw the content that spans multiple columns.
e.Graphics.DrawString(text, e.InheritedRowStyle.Font, forebrush, _
textArea)
e.Graphics.SetClip(oldClip)
End If
Finally
forebrush.Dispose()
End Try
If Me.dataGridView1.CurrentCellAddress.Y = e.RowIndex Then
' Paint the focus rectangle.
e.DrawFocus(rowBounds, True)
End If
End Sub 'dataGridView1_RowPostPaint
' Adjusts the padding when the user changes the row height so that
' the normal cell content is fully displayed and any extra
' height is used for the content that spans multiple columns.
Sub dataGridView1_RowHeightChanged(ByVal sender As Object, _
ByVal e As DataGridViewRowEventArgs) _
Handles dataGridView1.RowHeightChanged
' Calculate the new height of the normal cell content.
Dim preferredNormalContentHeight As Int32 = _
e.Row.GetPreferredHeight(e.Row.Index, _
DataGridViewAutoSizeRowMode.AllCellsExceptHeader, True) - _
e.Row.DefaultCellStyle.Padding.Bottom()
' Specify a new padding.
Dim newPadding As Padding = e.Row.DefaultCellStyle.Padding
newPadding.Bottom = e.Row.Height - preferredNormalContentHeight
e.Row.DefaultCellStyle.Padding = newPadding
End Sub
End Class 'DataGridViewRowPainting |
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