Hi all,

We are currently evaluating Xceed DataGrid for a project and have a requirement to have one ComboBoxEditor/Viewer cell in a DataGrid row filter another ComboBoxEditor/Viewer cell in the same row on item selection. i.e. user selects an item from the first cell combo drop down which then causes the second cell combo to update its items accordingly without a row leave. The test we came up with is rough and ready but works (other than the filtered combo cell updating to the first of the new items on filtering), but we wondered if there's a better solution that we've missed. We use a DataView and filter that using the Activate and Deactivate events of the ComboBoxEditor/Viewer. Here's what we came up with, can anyone se a better solution than this? Thanks in advance

ComboBoxEditor masterComboBoxEditor, filteredComboBoxEditor;

DataView dataView;

DataTable filterEditorDataTable, filterViewerDataTable;

public TestForm()

{

InitializeComponent();

// Table for data grid

DataTable gridDataTable = new DataTable();

gridDataTable.Columns.Add("col1");

gridDataTable.Columns.Add("col2");

gridDataTable.Rows.Add(1, 1);

gridDataTable.Rows.Add(2, 3);

gridDataTable.Rows.Add(3, 5);

gridControl.DataSource = gridDataTable;

// Table for master combo

DataTable masterDataTable = new DataTable();

masterDataTable.Columns.Add("key1");

masterDataTable.Columns.Add("val1");

masterDataTable.Rows.Add(1, "a");

masterDataTable.Rows.Add(2, "b");

masterDataTable.Rows.Add(3, "c");

masterComboBoxEditor = new ComboBoxEditor(masterDataTable, string.Empty, "key1");

masterComboBoxEditor.TemplateControl.DisplayFormat = "%val1%";

masterComboBoxEditor.TemplateControl.Columns["key1"].Visible = false;

ComboBoxViewer masterComboBoxView = new ComboBoxViewer(masterDataTable, string.Empty, "key1", "%val1%");

gridControl.Columns["col1"].CellEditorManager = masterComboBoxEditor;

gridControl.Columns["col1"].CellViewerManager = masterComboBoxView;

masterComboBoxEditor.DeactivatingControl += new CellEditorEventHandler(masterComboBoxEditor_DeactivatingControl);

// Table for filtered combo

filterEditorDataTable = new DataTable();

filterEditorDataTable.Columns.Add("key2");

filterEditorDataTable.Columns.Add("fkey1");

filterEditorDataTable.Columns.Add("val2");

filterEditorDataTable.Rows.Add(1, 1, "X");

filterEditorDataTable.Rows.Add(2, 1, "Y");

filterEditorDataTable.Rows.Add(3, 2, "D");

filterEditorDataTable.Rows.Add(4, 2, "E");

filterEditorDataTable.Rows.Add(5, 3, "F");

// Use data view to control filtering in 2nd combo box

dataView = filterEditorDataTable.DefaultView;

filteredComboBoxEditor = new ComboBoxEditor(filterEditorDataTable, string.Empty, "key2");

filteredComboBoxEditor.TemplateControl.DisplayFormat = "%val2%";

filteredComboBoxEditor.TemplateControl.Columns["fkey1"].Visible = false;

filteredComboBoxEditor.TemplateControl.Columns["key2"].Visible = false;

gridControl.Columns["col2"].CellEditorManager = filteredComboBoxEditor;

filteredComboBoxEditor.ActivatingControl += new CellEditorEventHandler(filteredComboBoxEditor_ActivatingControl);

filteredComboBoxEditor.DeactivatingControl += new CellEditorEventHandler(filteredComboBoxEditor_DeactivatingControl);

filterViewerDataTable = new DataTable();

filterViewerDataTable.Columns.Add("key2");

filterViewerDataTable.Columns.Add("fkey1");

filterViewerDataTable.Columns.Add("val2");

filterViewerDataTable.Rows.Add(1, 1, "X");

filterViewerDataTable.Rows.Add(2, 1, "Y");

filterViewerDataTable.Rows.Add(3, 2, "D");

filterViewerDataTable.Rows.Add(4, 2, "E");

filterViewerDataTable.Rows.Add(5, 3, "F");

ComboBoxViewer filteredComboBoxViewer = new ComboBoxViewer(filterViewerDataTable, string.Empty, "key2", "%val2%");

gridControl.Columns["col2"].CellViewerManager = filteredComboBoxViewer;

}

void masterComboBoxEditor_DeactivatingControl(object sender, CellEditorEventArgs e)

{

// Set filter for filtered combo using selected key from master combo

dataView.RowFilter = string.Format("fkey1 = {0}", e.Cell.Value);

}

void filteredComboBoxEditor_ActivatingControl(object sender, CellEditorEventArgs e)

{

dataView.RowFilter = string.Format("fkey1 = {0}", ((XceedDataRow)gridControl.CurrentRow).Cells["col1"].Value);

}

void filteredComboBoxEditor_DeactivatingControl(object sender, CellEditorEventArgs e)

{

// Reset filter on leaving filtered combo

dataView.RowFilter = string.Empty;

}

Hi,

I think I have found a sample project (in VB.NET) that does what you want.  I will let you be the judge.  I've just realized that there is no grid in this is example, only two wincombobox linked together.  I've included the complete project. 

Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Linq
Imports System.Text
Imports System.Windows.Forms
Imports Xceed.Editors

Namespace WindowsFormsApplication35
  Partial Public Class Form1
   Inherits Form
 Public Sub New()
   InitializeComponent()
 End Sub

 Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
   Dim dataSet As New DataSet()

   Dim categories As New DataTable("Categories")
   Dim subCategories As New DataTable("SubCategories")

   categories.Columns.Add(New DataColumn("PK", GetType(Integer)))
   categories.Columns.Add(New DataColumn("Name", GetType(String)))

   subCategories.Columns.Add(New DataColumn("PK", GetType(Integer)))
   subCategories.Columns.Add(New DataColumn("FK", GetType(Integer)))
   subCategories.Columns.Add(New DataColumn("Name", GetType(String)))

   Dim z As Integer = 0
   For i As Integer = 0 To 2
  categories.Rows.Add(i, "Category #" & i.ToString())

  For j As Integer = 0 To 4
    subCategories.Rows.Add(z, i, "SubCategory #" & j.ToString() & " of cat# " & i.ToString())
    z += 1
  Next j
   Next i

   dataSet.Tables.Add(categories)
   dataSet.Tables.Add(subCategories)

   dataSet.Relations.Add(New DataRelation("Cat_SubCat", categories.Columns("PK"), subCategories.Columns("FK")))

 

   m_winComboBoxMaster.Location = New Point(0, 50)
   m_winComboBoxChild.Location = New Point(300, 50)

 

   Me.Controls.Add(m_winComboBoxMaster)
   Me.Controls.Add(m_winComboBoxChild)

   m_winComboBoxChild.DropDownControl.BindingContext = m_winComboBoxMaster.DropDownControl.BindingContext

   m_winComboBoxMaster.SetDataBinding(dataSet, "Categories")
   m_winComboBoxMaster.DisplayFormat = "%Name%"

   AddHandler m_winComboBoxMaster.SelectedItemChanged, AddressOf winComboBoxMaster_SelectedItemChanged

   m_winComboBoxChild.SetDataBinding(dataSet, "Categories.Cat_SubCat")
   m_winComboBoxChild.DisplayFormat = "%Name%"

   m_winComboBoxMaster.SelectedIndex = 0
 End Sub

 Private m_winComboBoxMaster As New WinComboBox()
 Private m_winComboBoxChild As New WinComboBox()

 Private Sub winComboBoxMaster_SelectedItemChanged(ByVal sender As Object, ByVal e As EventArgs)
   m_winComboBoxChild.TextBoxArea.Text = TryCast(m_winComboBoxChild.Items(0).Values(2), String)
 End Sub
  End Class
End Namespace

Regards,

---

Ghislain
Technical Support and software developer
Xceed Software Inc.
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