PaintForeground doesn’t fire for inherited DataCell when the datatype is not System.String

[User (Old forums)]

#16100 |

I have basically copied the Puzzle demo so that I can implement a more Excel like grid including multiple selected cells etc.

Everything works well when the columns have a datatype of System.String, but when I change the datatype to something else, System.Int32 for instance, I have found that the PaintForeground event does not seem to fire and hence the code I have to mark a selected cell does not run.

The classes I use are as below:

SelectableCell

Imports System
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports Xceed.Grid

”’ <summary>
”’ Based on the ImageCell class in the Xceed Puzzle example
”’ </summary>
”’ <remarks></remarks>
Public Class SelectableCell
    Inherits DataCell

    Private mSelected As Boolean

    Public Property Selected() As Boolean
        Get
            Return mSelected
        End Get
        Set(ByVal Value As Boolean)
            If mSelected = Value Then
                Return
            End If

            mSelected = Value
            ‘ Force the cell to be redrawn.
            Me.Invalidate()
        End Set
    End Property

    Protected Sub New(ByVal template As SelectableCell)
        MyBase.New(template)

        mSelected = template.mSelected
    End Sub

    Public Sub New(ByVal parentColumn As Column)
        MyBase.New(parentColumn)

        ‘mSelected = False
    End Sub

    Protected Overrides Function CreateInstance() As Cell
        Return New SelectableCell(Me)
    End Function

    Protected Overrides Sub PaintForeground(ByVal e As GridPaintEventArgs)
        MyBase.PaintForeground(e)

        If mSelected Then
            Dim myBrush As Brush

            myBrush = New HatchBrush(HatchStyle.LightDownwardDiagonal, Color.FromArgb(100, SystemColors.HighlightText), Color.FromArgb(50, SystemColors.Highlight))
            Try
                e.Graphics.FillRectangle(myBrush, Me.ClientRectangle)
            Finally
                myBrush.Dispose()
            End Try
        End If
    End Sub
End Class

SelectableRow

Imports System
Imports Xceed.Grid

”’ <summary>
”’ Based on the ImageRow class in the Xceed Puzzle example
”’ </summary>
”’ <remarks></remarks>
Public Class SelectableRow
    Inherits DataRow

    Public Sub New()
        MyBase.New()
    End Sub

    Public Sub New(ByVal rowSelector As RowSelector)
        MyBase.New(rowSelector)
    End Sub

    Protected Sub New(ByVal template As SelectableRow)
        MyBase.New(template)
    End Sub

    Protected Overrides Function CreateCell(ByVal parentColumn As Column) As Cell
        Return New SelectableCell(parentColumn)
    End Function

    Protected Overrides Function CreateInstance() As Row
        Return New SelectableRow(Me)
    End Function

    Protected Overrides ReadOnly Property DefaultCanBeSelected() As Boolean
        Get
            Return False
        End Get
    End Property
End Class

Call to grid to set the SelectableRow

grdSelectable.DataRowTemplate = New SelectableRow

Imported from legacy forums. Posted by Christian (had 568 views)

[User (Old forums)]

#16101

I have it working. I am overriding the PaintBackground instead. It must have something to do with the Numeric CellViewerManager

Imported from legacy forums. Posted by Christian (had 1393 views)

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