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GDBGRID and DataRelations

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36235 Oct 24,2005 01:19 PM Oct 24,2005 07:13 PM Windows Forms 7
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Tags: GridControl
Stefan Tsalapatis
Asked On October 24, 2005 01:19 PM

Hi, The grid ( based on your GDBGTreeLines sample) works ok with Binder.AddRelation but 1. My DataRelations link between internal keys and I want to display the treelines in a user data column for example ( ProductID - ChildProdID) to show the ProductCode with treeline. ( the only I can think is to handle it in QueryCellInfo changing the CellValue but what will happen with tree symbols) 2. Howto display only one header column row when I have a lot of Relations with the same columns Regards Stefan

Stefan Tsalapatis
Replied On October 24, 2005 01:36 PM

Also 3. When I expand a level and some of the nodes have children and others have not then it shows all and those without children with expand symbol. and I must click on them to refresh it. How to avoid this ?

Administrator [Syncfusion]
Replied On October 24, 2005 01:37 PM

1) You can try swapping out the display text in a DrawCellDisplayText event handler.
private void gridDataBoundGrid1_DrawCellDisplayText(object sender, GridDrawCellDisplayTextEventArgs e)
{
	if(e.Style.CellType == "DataBoundTreeCell")
	{
		e.DisplayText = "x" + e.DisplayText;
	}
}
2) You can hide header rows by setting the heights to zero. grid.Model.RowHeights.SetRange(1,2,0);

Stefan Tsalapatis
Replied On October 24, 2005 02:13 PM

2. ok. 1 . I did this but in Model.QueryCellInfo because there I have easily information about the Row and Col. if(e.Style.CellType == "DataBoundTreeCell") e.Style.ellValue = Model[e.RowIndex,3].CellValue.ToString(); (where the 3rd column is hidden). Ok for the first level but in the lower levers, the binder displays the columns as they are and does not use the QueryCellInfo probably. Thanks

Administrator [Syncfusion]
Replied On October 24, 2005 02:54 PM

3) Here is a forum thread that has code to handle this. http://www.syncfusion.com/Support/Forums/message.aspx?MessageID=25785 1)I think the code will work better in DrawCellDisplayText. You can get the RowIndex from e.Style.Cellidentity.RowIndex.

Stefan Tsalapatis
Replied On October 24, 2005 06:06 PM

3. Forum Thread > No. It solves the problem but it delays unacceptably. 1. DrawCellDisplayText. The same with QueryCellInfo. The first level (Root) works ok . I have 3 columns plus 1 hidden and I display the hidden text in the column which links the relation. The Root is ok. When I expand the parent then the children nodes display all columns and the hidden. The Root Level has 3 visible columns , The Child Level has 4 visible columns. and it does not show the Text from the event. It seems that for every level the binder apply the defaults. Problems.. I am thinking to override the CellRenderer for the treecell. Regards

Administrator [Syncfusion]
Replied On October 24, 2005 06:31 PM

1) Here is a sample with DrawCellDisplayText showing a value from some other grid column at all levels. What are you doing differently? http://www.syncfusion.com/Support/user/uploads/CS_6f62d708.zip

Stefan Tsalapatis
Replied On October 24, 2005 07:13 PM

Clay, 1. The obvious difference that I saw immediately and fixed the problem is the call of GridHierarchyLevel.LayoutColumns(.. This code does not exist in 3-4 samples with hierarchical grids ( GDBGTreeLines, etc ) and the class reference does not give understandable information. It would be more productive to solve such simple (finally) problems and for us to exploit you :-) for more difficult issues. Thanks Regards

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