Drill down Reports. Using controls or drawing strings

Posted on 2009-05-05
Last Modified: 2012-05-06
I have several Window Forms that display economical reports in my application. Due to the lack of speed of adding controls when the form is created, I draw the report values in the pain event in the forms.

Now, I'd like to add a drill down function and wonder what's the best way to go about. The reports normally displayes about 20 rows in 12 columns, (sometimes up to 36 columns though), so there are quite a few values.

Is there a way to add controls to a form in a quicker way?

If this is not possible, I guess I have to make my own table of positions to determine where the mouse is and to change the cursor when it is over a drawn string. The easiest way I can think of is to have an array(formposX,formposY) containing null or drilldownvalue depending on the strings. Anyone have a better solution?

Thanks in advance

Question by:ekenman
  • 3
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LVL 100

Expert Comment

ID: 24310903
What reporting tool?


Author Comment

ID: 24311951
No reporting tool, just Winform
LVL 83

Expert Comment

ID: 24312164
Are you just painting some labels on the form? Paint event is not the best place to do so. Can you show us some code? Is using Crystal Reports a viable option for you? These come free with .NET
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Author Comment

ID: 24323672
CodeCruiser, I'm just painting text, no labels since it is to slow to add controls. When the user change an option in the report, there might be more fields to display, so Crystal will not do it for me.

Below is some of the code from the paint event. I also paint rectangles and headers, but it's done in the same manner.

Reportarray holds the values from my sql-data. Canvas is the forms painteventargs.

Best Regards


            For Each item As Reportvalue In ReportArray

                If Not item Is Nothing Then

                    If item.Type <> ReportFieldType.CRLF Then

                        Dim temploc As Point

                        temploc.X = item.Location.X - hscrollpos - ColRightMargin

                        temploc.Y = item.Location.Y - vscrollpos

                        canvas.DrawString(item.Text, item.Font, Brushes.Black, temploc, format1)

                        temploc.X = item.Location.X - vscrollpos

                        If item.Type = ReportFieldType.CalculatedValue And item.Location.X = 342 Then

                            'Add a line

                            canvas.DrawLine(Pens.Black, 15 - hscrollpos, item.Location.Y - 2 - vscrollpos, (Reportperiods) * ColDistance + HeaderLeftMargin + HeaderWidth - 1 - hscrollpos, item.Location.Y - 2 - vscrollpos)

                        End If

                    End If

                End If


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LVL 83

Expert Comment

ID: 24323753
Then the way to implement drilldown is to store the bounds of each text in a collection and on mouse move event, you would be matching the current x, y with stored bounds and if it happens to be within the bounds of a drill down enabled field then change the cursor to hand. Same would go for mouse click event.

Author Comment

ID: 24324738
So what kind of object would I use for the collection? Should I make my own object containing x,y, width and height and how do I compare it? Is there an object width a withinbounds method?
LVL 83

Accepted Solution

CodeCruiser earned 500 total points
ID: 24325048
You would use a collection of rectangles. So lets say a text is occupying x1 = 10, y1 = 10, x2 = 20, y2 = 80
So you would put a condition like this

If (x>x1 and x<x2) and (y>y1 and y<y2) then
'within bounds.
end if

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