This example demonstrates how to use ViewModel properties to track and control focused row changes both for Master and Detail grids. This capability is achieved by creating attached behavior that handles all necessary events (especially for the focused view and row changing, both in the detail and master grids). The logic of focusing rows can be changed inside this behavior depending on your requirements. For example, you may want not to focus the first detail row when a master row is expanded. If so, change the MasterRowExpanded event handler as follows:
[C#]voidMasterGridMasterRowExpanded(objectsender,RowEventArgse){(MasterGrid.GetDetail(MasterView.FocusedRowHandle)asGridControl).View.FocusedRow=null;}
So, the main idea of the example is to show how the row focusing logic can be defined in the GridControl that operates in Master-Detail mode.
Note that the approach shown in the example will work only with the DataControlDetailDescriptor, as other descriptors use custom templates to display detail content that is not synchronized with the master grid. In addition, the created behavior will not work in the multi-level Master-Detail hierarchy.
Example Comments
Added By: Manar Husrieh at: 12/24/2012 7:50:04 AM
Hi,
I have tried to implement the example but I have a problem. When I am using master grid with multiple details using TabViewDetailDescriptor, The parent is not a master grid. I have checked it and its type is TabViewDetailDescriptor and its parent is always null. This problem is in the DetailFocusedRowBehavior in the MasterView property.
Regards,
Manar Husrieh
Unfortunately this example has a serious issue. You can see the problem if you'll do the following:
1) Expand first master row (Bruce). In result we see that in ViewModel FocusedEmployee=Bruce and FocusedOrder=Supplier 1 - TV.
2) Expand second master row (Cindy). In result we see that in ViewModel FocusedEmployee=Cindy and FocusedOrder=Supplier 1 - Blue-Ray Player.
3) Now select Suplier 1 - TV detail row under Bruce master row again. And what we see? In ViewModel FocusedOrder=Supplier 1 - TV, but the FucusedEmployee=Cindy. Obviously I expected to see Bruce selected.
But it's not obvious how to change this example to make it work this way. Can you show how to change this example to automatically focus the parent master row when detail row gets selected?
Hello guys,
I apologize for the delay in our response. Usually, we do not review comments to examples, so, in the future, I suggest you create a support ticket regarding problems you face.
As for your questions:
Manar, I'm afraid it is not possible to use TabViewDetailDescriptor with the demonstrated behavior. It supports DataControlDetailDescriptor only.
Volodymyr, thank you for reporting this issue. This behavior is definitely incorrect. I have fixed it and updated the example.