Custom DataGridViewTextBoxCell refreshing...

[Kevin]

I've created a custom class that inherits from the
DataGridViewTex tBoxColumn and DataGridViewTex tBoxCell. The cell is
databound to a text field that contains the path to a JPG image. The
JPG image is displayed in the cell if the picture is present on the
harddrive using Protected Overloads Overrides Sub Paint.

The problem is that the image is only displayed in the cell when the
cell receives the focus.

How can I get it to paint the picture in each visible row without the
row receiving focus first?

[ClayB]

Re: Custom DataGridViewTex tBoxCell refreshing...

Here is a custom cell class that worked ok for me to show a 10x10
bitmap in a particular column in each row. Do the bitmaps you use fit
into the cell?

Public Class MyTextBoxCell
Inherits DataGridViewTex tBoxCell

Protected Overrides Sub Paint(ByVal graphics As Graphics, ByVal
clipBounds As Rectangle, ByVal cellBounds As Rectangle, ByVal rowIndex
As Integer, ByVal cellState As DataGridViewEle mentStates, ByVal value
As Object, ByVal formattedValue As Object, ByVal errorText As String,
ByVal cellStyle As DataGridViewCel lStyle, ByVal advancedBorderS tyle As
DataGridViewAdv ancedBorderStyl e, ByVal paintParts As
DataGridViewPai ntParts)
MyBase.Paint(gr aphics, clipBounds, cellBounds, rowIndex,
cellState, value, formattedValue, errorText, cellStyle,
advancedBorderS tyle, paintParts)
Dim pt As Point = cellBounds.Loca tion
pt.Offset(2, 2)
graphics.DrawIm age(Bitmap.From File("Bitmap1.b mp"), pt)
End Sub 'Paint
End Class 'MyTextBoxCell

=============== =
Clay Burch
Syncfusion, Inc.

[Kevin]

Re: Custom DataGridViewTex tBoxCell refreshing...

I was using a Property called Image that would retrieve the image from
the file and for some reason the rowvalue wasn't being passed to it. I
got rid of it altogether and retrieve the image in the Paint sub.

I put the image into a picturebox the size I need the image to be and
then I pass the picturebox image. Thanks for your reply. You made me
rethink my code a little bit. Here's what I'm using:


Protected Overloads Overrides Sub Paint(ByVal graphics As Graphics,
ByVal clipBounds As Rectangle, ByVal cellBounds As Rectangle, ByVal
rowIndex As Integer, ByVal cellState As DataGridViewEle mentStates,
ByVal value As Object, ByVal formattedValue As Object, ByVal errorText
As String, ByVal cellStyle As DataGridViewCel lStyle, ByVal
advancedBorderS tyle As DataGridViewAdv ancedBorderStyl e, ByVal
paintParts As DataGridViewPai ntParts)
MyBase.Paint(gr aphics, clipBounds, cellBounds, rowIndex,
cellState, value, formattedValue, errorText, cellStyle,
advancedBorderS tyle, paintParts)

MyBase.Paint(gr aphics, clipBounds, cellBounds, rowIndex,
cellState, value, formattedValue, _
errorText, cellStyle, advancedBorderS tyle, paintParts)
Dim pt As Point = cellBounds.Loca tion

Try
Dim OriginalImage As Image =
Image.FromFile( My.Settings.Ima gePath + "\" + value)
Dim SmallerImage As New Bitmap(Original Image,
PictureBox1.Wid th, PictureBox1.Hei ght)
PictureBox1.Ima ge = SmallerImage
graphics.DrawIm age(PictureBox1 .Image, cellBounds.Loca tion)
Catch
'do nothing
End Try
End Sub




On 11 Feb 2007 01:12:43 -0800, "ClayB" <clayb@syncfusi on.comwrote:

>Here is a custom cell class that worked ok for me to show a 10x10
>bitmap in a particular column in each row. Do the bitmaps you use fit
>into the cell?
>
>Public Class MyTextBoxCell
Inherits DataGridViewTex tBoxCell
>
Protected Overrides Sub Paint(ByVal graphics As Graphics, ByVal
>clipBounds As Rectangle, ByVal cellBounds As Rectangle, ByVal rowIndex
>As Integer, ByVal cellState As DataGridViewEle mentStates, ByVal value
>As Object, ByVal formattedValue As Object, ByVal errorText As String,
>ByVal cellStyle As DataGridViewCel lStyle, ByVal advancedBorderS tyle As
>DataGridViewAd vancedBorderSty le, ByVal paintParts As
>DataGridViewPa intParts)
MyBase.Paint(gr aphics, clipBounds, cellBounds, rowIndex,
>cellState, value, formattedValue, errorText, cellStyle,
>advancedBorder Style, paintParts)
Dim pt As Point = cellBounds.Loca tion
pt.Offset(2, 2)
graphics.DrawIm age(Bitmap.From File("Bitmap1.b mp"), pt)
End Sub 'Paint
>End Class 'MyTextBoxCell
>
>============== ==
>Clay Burch
>Syncfusion, Inc.