Hello,
im using XamDataGrid hierachical through binding its DataSource to a hierachical DataSet, and provide they FieldLayout + RelationField for each FieldLayout/Table, dynamically. (I generate the grid all code-behind, no xaml. (Dynamic relations & columns.))
I dont want the relation headers "relation6" / "relation7" / ..
My problem is, i add multiple child-relations for a table - used by different rows. The grid now displays every relation for every row, even if its empty for this row. How should i provide the relations? Or Hide the relation-groups/headers? (hide relation field?)
GreetingsiA. Kits
Hi Joerg,
If I'm understanding this correctly, you just want to hide the relations that have no child records? This relations are appearing because a Field has been defined for that relation. I presume that you are using auto generated fields? You can hide these relations by using the following style:
<Style TargetType="{x:Type igWPF:ExpandableFieldRecordPresenter}"> <Style.Triggers> <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Record.HasChildren}" Value="False"> <Setter Property="Height" Value="0"/> </DataTrigger> </Style.Triggers></Style>
Those relations that you see are called ExpandableFieldRecordPresenters. When there is children data you would normally be able to expand the relation and see the child data but if there are no children it does not hide the relation itself. You can do this with the above trigger. If there are no children in the ExpandableFielRecordPresenter then it will set the height to 0. We set the height to 0 because you can't actually set the Visibility to Collapsed. If you do, the record space will still be shown.
Hi Rob,
thanks for your fast response.
i dont want the ExpandableFieldRecordPresenters "relation6" / "relation7".. displayed at all. Also not for rows which has children.
I want it like you can see in the first hierachical level of my screenshot - the expansionindicator directly before the row, without any additional header "RelationName".
PS: I dont use auto generated fields. I generate them myself. I use KeyMatchingEnforced (and layout.Key = table.TableName).
My data can only have 1 relationship per row - ID -> child.ParentId
- My childs are in seperate Tables, because they again can have own childs. - I generate a FieldLayout for each table including a field for its children (named of child-table).
My source data is one table referencing itself with ParentID -> ID. Its nested depth is dynamically. (It can be several levels)
Any hints on this?
Those ExpandableFieldRecordPresenters are there because your FieldLayout has more than one Field for the child data. When there is more than one Field it displays these presenters so the user can tell which is which. So there are two things that you can do in order to remove the ExpandableFieldRecordPresenters that you don't want to see. The first is to set the Visibility on the Field that represents that relation in your FieldLayout. If you set it to Collapsed then the child data will not be displayed. If you do this for every relation Field except the one you want then you will only see the single child set. You will still see the ExpandableFieldRecordPresenter for it though since the FieldLayout has more than one Field for child data.
This leads to the second option: remove the Field from the FieldLayout all together so there is only one relation Field. If there is only one relation Field then no ExpandableFieldRecordPresenters will be used and expanding the parent record will immediately show the single set of child records.
I have attached a basic sample that shows what I mean. If you run the sample as is, you will see two relation Fields: "ChildRelation1" and "ChildRelation2". Each has its own ExpandableFieldRecordPresenter. Now go to the code behind and into the CreateLayouts() method. You will see some commented out code with comments above them. The first one sets the Visibility on the Field that represents one of the child relationships. Comment this back in so it hides the field and then rerun the sample. You will see that when you expand the first record it still shows an ExpandableFieldRecordPresenter for "ChildRelation2". Go back to the code and then use the second commented out line. This removes the Field entirely. Rerun and you will see that no ExpandableFieldRecordPresenter is shown and it immediately shows the child data.
So basically you have to do the same thing in your application. If you aren't using those Fields, or you don't want to show their data then you should just remove the relation Field from your FieldLayout.