The Paint event is raised by each grid element after it has been painted in order to allow for additional custom painting of the grid element's foreground. To completely custom paint a grid element, jump to the Custom Painting topic.
Basic steps - C#
To subscribe to a Paint event, the following steps must be performed:
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Obtain a reference to the desired grid element.
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Subscribe to the Paint event using the GridPaintEventHandler delegate class.
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Create a new method that will handle the events that are raised.
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Place the desired code in the newly created event handler.
Basic steps - VB.NET
To subscribe to a Paint event, the following steps must be performed:
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Obtain a reference to the desired grid element.
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Subscribe to the Paint event using the AddHandler/AddressOf keywords.
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Create a new method that will handle the events that are raised.
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Place the desired code in the newly created event handler.
Demonstration
This example demonstrates how to handle the Paint event for a group's margin.
| VB.NET |
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Dim group As New Group()
AddHandler Group.Margin.Paint, AddressOf Me.group_MarginPaint
Private Sub group_MarginPaint( ByVal sender As Object, ByVal e As GridPaintEventArgs )
Dim margin As GroupMargin = CType( sender, GroupMargin )
Dim brush As New SolidBrush( Color.Black )
Dim starty As Integer = margin.ClientRectangle.Y
Dim row As Row
For Each row In margin.ParentGroup.HeaderRows
starty += row.Height
Next row
If starty < margin.ClientRectangle.Bottom Then
Dim font As New Font( margin.Font.FontFamily, 8, FontStyle.Bold )
Dim format As New StringFormat( StringFormatFlags.DirectionVertical )
e.Graphics.DrawString( margin.ParentGroup.Title, font, brush, margin.ClientRectangle.X,starty, format )
format.Dispose()
font.Dispose()
End If
brush.Dispose()
End Sub
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| C# |
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Group group = new Group();
group.Margin.Paint += new GridPaintEventHandler( this.group_MarginPaint );
private void group_MarginPaint( object sender, GridPaintEventArgs e )
{
GroupMargin margin = ( GroupMargin )sender;
using( SolidBrush brush = new SolidBrush( Color.Black ) )
{
int starty = margin.ClientRectangle.Y;
foreach( Row row in margin.ParentGroup.HeaderRows )
starty += row.Height;
if( starty < margin.ClientRectangle.Bottom )
{
using( Font font = new Font( margin.Font.FontFamily, 8, FontStyle.Bold ) )
{
using( StringFormat format = new StringFormat( StringFormatFlags.DirectionVertical ) )
{
e.Graphics.DrawString( margin.ParentGroup.Title, font, brush,
margin.ClientRectangle.X, starty, format );
}
}
}
}
}
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