SOLVED: Virtual mode with hierarchical data

Hi,

    I'm trying to use the report control in virtual mode with hierarchical data. I've been investigating the use of "VirtualRowLevel" and "VirtualRowFlags" properties of "Metrics" object in "OnBeforeDrawRow" event.

    Everything goes fine if I load a one-level tree:

    1
    |
    +- 2
    |
    +- 3
    |  
    4
    |
    5

    But I cannot get right result when trying to load a multilevel one:

    1
    |
    +- 2
    |  |
    |  +- 3
    |
    +- 4
    |
    5

    Is there any way to show a multilevel tree using virtual mode to get this right result? (It seems the control ignore the property "VirtualRowLevel" when > 1).

    Kind regards,

FJSen

    Hi,

    I've tested it with 13.2 beta release at https://forum.codejock.com/uploads/BetaOCX/ReportControlBeta13-2.rar and it seems to semi-work. I expect the following result:

    1
    |
    +- 2
    |  |
    |  +- 3
    |
    +- 4
    |
    5

    but i get this result:

    1
    |
    +- 2
       |
       +- 3
    |
    +- 4
    |
    5

    All that I need to get the rigth result is to have any property or method in the ReportRecordItemMetrics object (at OnBeforeDrawRaw handler) to let me to say which "Virtual row levels" have to draw a vertical line in the current "virtual" record. Perhaps one call to this method or property per vertical line to draw indicating the level (0 >= Level < VirtualRowLevel). With this simple solution the Report control will provide a full hierarchical virtual mode support.

    Also, I'd like to upload an image to describe the problem. I've read that administrators must allow that ;-)

    Kind regards,

FJSen

Hi MDoubson,

    When we work in virtual mode, the hosting app is responsible to give information to the control to draw the hierarchy. The only ways the control now accepts this information are (I'm talking about OnBeforeDrawRaw handler) :

1- "VirtualRowLevel" property of recordItemMetrics object
    Here we can tell to the control the depth of the item.

2- "VirtualRowFlags" property of recordItemMetrics object
    Here we can tell to the control if the record has children and if it is the last child.

3- "Expanded" property of row object
     We can tell to the control if the record is expanded or not.

    So, we also need any method or property where we can tell to the control if are there any "uncles" of the item, that will be drawn later but whose parents are drawn yet (the 4th record in my example. I'd need something like this:

    recordItemMetrics->MarkVirtualRowLevelToDrawHiearchyLine(x);   // x = 0 in my example when row = 3

    Where 0 <= x < VirtualRowLevel of the current item.

    With this info, the control must draw a vertical line at indent 0 but not at indent 1, when in 3rd row.

    If we'd have a more complex hierarchy, perhaps we'd need to draw several vertical lines (with several call to the new method):

    1
    |
    +- 2
    |  |
    |  +- 3
    |     |
    |     +- 4
    |     |  |
    |     |  +- 5
    |     |
    |     +- 6
    |
    +- 7
    |
    8

    When we are at OnBeforeDrawRaw of raw 5, we need to perform two calls to the new method to tell the control to draw two additional lines at indents 0 and 2:

    recordItemMetrics->VirtualRowLevel= 4;
    recordItemMetrics->MarkVirtualRowLevelToDrawHiearchyLine(0);
    recordItemMetrics->MarkVirtualRowLevelToDrawHiearchyLine(2);

    I expect this explanation can clarify the problem.

    Kind regards,

FJSen

Note: I've opened an issue one week ago but nobody responds for the last 4 or 5 days. I think this method is better because more people can participate and give another points of view. Thanks.