TreeList - How to implement the IPrintable interface

afutrell

created 10 years ago

[DevExpress Support Team: CLONED FROM E8: How to implement the IPrintable interface]
Could you give a sample using the TreeList control? I am trying to accomplish the same thing as mentioned in this ticket (https://www.devexpress.com/Support/Center/Question/Details/Q536648). Thanks!

Answers approved by DevExpress Support

Vasily (DevExpress Support)

created 10 years ago (modified 10 years ago)

Hi Adam,

Your task is not completely clear to me. If I understand you correctly, you are talking about the WinForms TreeList control, but this control already implements the IPrintable interface (see the TreeList Class help topic for more information).

Show previous comments (3)

afutrell 10 years ago

Alright. I figured out how to get the TreeList control to print on a report using the PrintableComponentContainer. But I have another problem. I can't get the TreeList's datasource to refresh between before print events of my detail report. I am assigning it different datasources between prints of the detail. Hope this makes sense. Thanks in advance!

DevExpress Support Team 10 years ago

Hi Adam,

This behavior is caused by the fact that the TreeList control caches the previously created document and uses it for subsequent preview/print/export actions. Currently, there is no public way to clear the cached document. We are aware of this limitation and are going to provide a public way to clear the document. You can track our progress in the following ticket:
Make the TreeList.ClearDocument method public

In the meantime, the only possible solution is to use System.Reflection as follows:

Visual Basic
Dim mi As MethodInfo = GetType(TreeList).GetMethod("ClearDocument", BindingFlags.NonPublic Or BindingFlags.Instance)  
mi.Invoke(treeList1, Nothing)

Please note that this code uses an undocumented functionality, and I cannot guarantee that this approach will work in future versions.

afutrell 10 years ago

At what point should this reflected method be invoked? I have added a code snippet to show an example of what my code looks like. Please let me know if there is anything else that I need to provide. Thank you.
Private Sub detailInspection_BeforePrint(sender As Object, e As PrintEventArgs) Handles detailInspection.BeforePrint
       Dim tlist As New TreeList()
       tlist.Parent = New Form()
       tlist.OptionsPrint.AutoWidth = True
       tlist.OptionsView.AutoWidth = True
       tlist.OptionsPrint.UsePrintStyles = True
Dim mi As System.Reflection.MethodInfo = GetType(TreeList).GetMethod("ClearDocument", BindingFlags.NonPublic Or BindingFlags.Instance)
       mi.Invoke(tlist, Nothing)

…

tlist.BestFitColumns()
       tlist.ExpandAll()
       tlist.ForceInitialize()
       pccResults.PrintableComponent = tlist
End Sub

DevExpress Support Team 10 years ago

Hi Adam,

Thank you for the provided code snippet. I see the issue. Our developers are working on it in the scope of the following ticket: PrintableComponentContainer - Redefining the PrintableComponent property does not reset the inner Link that is used to create a document

The problem is that the inner PrintableComponentContainer document does not get reset when you change the PrintableComponent property value. To resolve this issue, use System.Reflection to manually reset the field value:

Visual Basic
Private Sub detailInspection_BeforePrint(sender As Object, e As PrintEventArgs) Handles detailInspection.BeforePrint  

       Dim tlist As New TreeList()  
        tlist.Parent = New Form()  
        tlist.OptionsPrint.AutoWidth = True  
        tlist.OptionsView.AutoWidth = True  
        tlist.OptionsPrint.UsePrintStyles = True  

Dim fi As System.Reflection.FieldInfo = GetType(WinControlContainer).GetField("link", BindingFlags.NonPublic Or BindingFlags.Instance)  
        fi.SetValue(pccResults, null)  

    ...  

        tlist.BestFitColumns()  
        tlist.ExpandAll()  
        tlist.ForceInitialize()  
        pccResults.PrintableComponent = tlist  

End Sub

afutrell 10 years ago

That works great! Thanks! The only thing now is that the treelist is not printing the same width consistently. Notice in the attached PDF that the last treelist is a little wider than the first two. Is there anything I can do to make the widths consistent?

TreeList Width.pdf

DevExpress Support Team 10 years ago

Hi Adam,

It is difficult to give you a precise answer without being able to examine your report implementation. In general, try changing the TreeList.Width property value to make it equal to the usable page width (Report.PageWidth - Report.Margins.Left - Report.Margins.Right). If the problem persists, provide me with a sample project for further research.

Created: October 20, 2014 7:59 PM

Modified: October 21, 2014 7:00 AM

Platform: ASP.NET Web Forms WinForms

Product: XtraPrinting Library

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TreeList - How to implement the IPrintable interface

Answers approved by DevExpress Support

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