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DataWindow.NET How To: DataWindow Formatting

A simple but powerful way of formatting data in the presentation layer

A particular problem is determining which of the columns in the DataWindow actually have a control present on the surface of the DataWindow object. The DataWindow will throw an exception if you attempt to access certain properties of a column and it doesn't have those properties because they're visible control properties. I found that attempting to access the Band property works, and columns without a visible control report back "?" for the band. The GetVisibleColumns method then returns an array containing only those columns that have a visible control.

GetVisibleColumns

Public Function GetVisibleColumns() As ArrayList
Dim columns As ArrayList = GetColumns()
Dim visiblecolumns As New ArrayList
Dim band, col As String
For Each col In columns
   band = MyBase.GetProperty(col + ".Band")
   If band <> "?" Then
    visiblecolumns.Add(col)
   End If
Next
Return visiblecolumns
End Function

Another native feature of the DataGrid control is the display of a sort arrow indicator in the column headers when the column header click is used to sort that column. I've incorporated that using a .NET implementation of the grid sort indicator sample from TopWizProgramming. The CreateHeaderSortArrows method dynamically creates a set of computed columns for every column header (at the same position and same size as the column headers) that automatically displays an up or down arrow based on the DataWindow object sort expression (See Listing 1).

Another modification was made directly to the DataWindow object. The DataWindow control has a SetRowFocusIndicator that takes a bitmap that can be used to indicate what the current row is. In most grid DataWindow implementations turning on row selection for the row usually indicates this. However, I was trying to mimic the DataGrid style as much as possible. The SetRowFocusIndicator wasn't giving me quite the results I wanted. So instead, I added a computed column to the DataWindow with an expression of:

if ( currentRow() = getRow(), '4', '' )

and then set the font for that column to Marlett.

Conclusion
As we've seen, the DataWindow provides much of the same functionality as the DataGrid control. Most of the areas where the DataGrid provides functionality not native to the DataWindow - sort on column header click and sort indicators - are easily added by subclassing the control and adding a few lines of code. On the other hand, the DataWindow offers functionality not easily implemented in the DataGrid primarily because:

  1. The separate DataWindow object lets the developer create the visual presentation of the data via the DataWindow Designer painter rather than having to code it in script.
  2. Most of the DataWindow object properties accept expressions that self-evaluate so properties can automatically change based on changes to the state or value of data.

More Stories By Bruce Armstrong

Bruce Armstrong is a development lead with Integrated Data Services (www.get-integrated.com). A charter member of TeamSybase, he has been using PowerBuilder since version 1.0.B. He was a contributing author to SYS-CON's PowerBuilder 4.0 Secrets of the Masters and the editor of SAMs' PowerBuilder 9: Advanced Client/Server Development.

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Most Recent Comments
monkfish 11/27/08 08:48:36 AM EST

thanks for the information. betsson iddaa

SohbetGor 11/17/08 09:42:36 AM EST

thanks you...

Sohbet

Qarisma 11/05/08 05:54:22 PM EST

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alvin 07/23/08 08:39:54 PM EDT

how can i change the highlight color of selected row? the default is blue which looks heavy.
thanks

Bruce Armstrong 12/10/07 12:27:42 PM EST

I'd suggest posting your question in Sybase's DataWindow.Net forum.

http://www.sybase.com/detail?id=1031119

It would be much easier to address there.

Praveen 12/10/07 02:02:28 AM EST

Sir ,

We are using Datawindow.net 2.0[Trail] in VS2005 with ASP.Net 2.0 & C#.Net . Using WebDatawindow.net in ASP.Net data retrieving and also
data interting are so smoth . We using connection ADO.net & ASP.Net security trust level default security level ( full trust level )

For security problem most of developer suggests that 'medium trust'and also our webserver support only medium trust.So we are changing Security policy to 'medium'.
( In %windir%\Microsoft.NET\Framework\v2.0.50727\CONFIG\Web.Config
to change
to
)

***********Then I am facing a crucial problem ************
Required permissions cannot be acquired.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Security.Policy.PolicyException: Required permissions cannot be acquired.

How can overcome to in this problem . If you have any solution ... pls forward me ...

Bruce Armstrong 11/14/07 07:09:07 AM EST

I'd suggest posting your question in Sybase's DataWindow.Net forum:

http://www.sybase.com/detail?id=1031119

It would be much easier to address there.

Atif Riaz 11/14/07 01:51:39 AM EST

Hey this is atif i have read your articles they were really help full. what i am trying is that i am using data window 2.0 in Dotnet now i want any CSS file like we do it for html or asp pages i want to define CSS file from where i can formate the report made in Data Window automatically. I need your help?

Bruce Armstrong 02/07/06 03:58:48 PM EST

If you can't find it here, check the Sybase CodeXchange site. I loaded it there as well:

http://datawindownet.codexchange.sybase.com/servlets/ProjectDocumentList...

Mike 02/07/06 02:58:03 PM EST

Where is an arcticle code?

SYS-CON Australia News Desk 02/03/06 01:45:59 PM EST

In this article, we're going to look at how DataWindow.NET technology is a simpler but more powerful way of formatting data in the presentation layer. We'll be taking a sample application provided by Microsoft for .NET and implementing it using DataWindow.NET technology.

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