How to Use SelectedIndexChanged Event (ComboBoxCell)

In the combo box cell, there are two ways to perform processing (similar to the ComboBox.SelectedIndexChanged event). One is by implementing the GcMultiRow.CellEditedFormattedValueChanged event and another is by using the ComboBoxEditingControl.SelectedIndexChanged event. Implementation through the GcMultiRow.CellEditedFormattedValueChanged event is recommended.

Using Code

This example uses the CellEditedFormattedValueChanged event.

[VB]

Imports GrapeCity.Win.MultiRow

Private Sub GcMultiRow1_CellEditedFormattedValueChanged(ByVal sender As System.Object, ByVal e As GrapeCity.Win.MultiRow.CellEditedFormattedValueChangedEventArgs) Handles GcMultiRow1.CellEditedFormattedValueChanged
    Dim gcMultiRow As GcMultiRow = TryCast(sender, GcMultiRow)
    Dim currentCell As Cell = gcMultiRow.Rows(e.RowIndex).Cells(e.CellIndex)

    If TypeOf currentCell Is ComboBoxCell Then
        Console.WriteLine("{0},{1}", e.Reason.ToString(), currentCell.EditedFormattedValue)
    End If
End Sub

[CS]

using GrapeCity.Win.MultiRow;

private void gcMultiRow1_CellEditedFormattedValueChanged(object sender, GrapeCity.Win.MultiRow.CellEditedFormattedValueChangedEventArgs e)
{
    GcMultiRow gcMultiRow = sender as GcMultiRow;
    Cell currentCell = gcMultiRow.Rows[e.RowIndex].Cells[e.CellIndex];

    if (currentCell is ComboBoxCell)
    {
        Console.WriteLine("{0},{1}", e.Reason.ToString(), currentCell.EditedFormattedValue);
    }
}

When using the ComboBoxEditingControl.SelectedIndexChanged event, you will need to use an implementation that is different from the TextBoxEditingControlTextChanged event, in order to avoid catching events that are fired during cell initialization.

Using Code

This example uses the SelectedIndexChanged event.

[VB]

Imports GrapeCity.Win.MultiRow

Private _comboBoxEditingControl1 As ComboBoxEditingControl = Nothing

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Dim comboBoxCell1 As New ComboBoxCell()
    comboBoxCell1.Name = "ComboBoxCell1"
    comboBoxCell1.Items.AddRange("A", "B", "C")
    Dim labelCell1 As New LabelCell()
    labelCell1.Name = "LabelCell1"
    Dim labelCell2 As New LabelCell()
    labelCell2.Name = "LabelCell2"

    GcMultiRow1.Template = Template.CreateGridTemplate(New Cell() {comboBoxCell1, labelCell1, labelCell2})
End Sub

Private Sub GcMultiRow1_EditingControlShowing(ByVal sender As System.Object, ByVal e As GrapeCity.Win.MultiRow.EditingControlShowingEventArgs) Handles GcMultiRow1.EditingControlShowing
    ' Adding cell edit control event.
    If TypeOf e.Control Is ComboBoxEditingControl Then
        Me._comboBoxEditingControl1 = TryCast(e.Control, ComboBoxEditingControl)
        AddHandler Me._comboBoxEditingControl1.SelectedIndexChanged, AddressOf Me._comboBoxEditingControl1_SelectedIndexChanged
    End If
End Sub

' Event of cell edit control (Same as ComboBox.SelectedIndexChanged)
Private Sub _comboBoxEditingControl1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
    Dim comboBox As ComboBoxEditingControl = TryCast(sender, ComboBoxEditingControl)
    comboBox.GcMultiRow.CurrentRow.Cells("LabelCell1").Value = comboBox.Items(comboBox.SelectedIndex).ToString()
    comboBox.GcMultiRow.CurrentRow.Cells("LabelCell2").Value = comboBox.SelectedIndex
End Sub

Private Sub GcMultiRow1_CellEndEdit(ByVal sender As System.Object, ByVal e As GrapeCity.Win.MultiRow.CellEndEditEventArgs) Handles GcMultiRow1.CellEndEdit
    ' Delete the event of cell edit control.
    If Me._comboBoxEditingControl1 Is Nothing Then
        RemoveHandler Me._comboBoxEditingControl1.SelectedIndexChanged, AddressOf Me._comboBoxEditingControl1_SelectedIndexChanged
        Me._comboBoxEditingControl1 = Nothing
    End If
End Sub

[CS]

using GrapeCity.Win.MultiRow;

private ComboBoxEditingControl _comboBoxEditingControl1 = null;

private void Form1_Load(object sender, System.EventArgs e)
{
    ComboBoxCell comboBoxCell1 = new ComboBoxCell();
    comboBoxCell1.Name = "comboBoxCell1";
    comboBoxCell1.Items.AddRange("A", "B", "C");
    LabelCell labelCell1 = new LabelCell();
    labelCell1.Name = "labelCell1";
    LabelCell labelCell2 = new LabelCell();
    labelCell2.Name = "labelCell2";

    GcMultiRow1.Template = Template.CreateGridTemplate(new Cell[] {comboBoxCell1, labelCell1, labelCell2});
}

private void gcMultiRow1_EditingControlShowing(object sender, GrapeCity.Win.MultiRow.EditingControlShowingEventArgs e)
{
    // Adding cell edit control event.
    if (e.Control is ComboBoxEditingControl)
    {
        this._comboBoxEditingControl1 = e.Control as ComboBoxEditingControl;
        this._comboBoxEditingControl1.SelectedIndexChanged += new EventHandler(_comboBoxEditingControl1_SelectedIndexChanged);
    }
}

// Event of cell edit control (Same as ComboBox.SelectedIndexChanged)
private void _comboBoxEditingControl1_SelectedIndexChanged(object sender, EventArgs e)
{
    ComboBoxEditingControl comboBox = sender as ComboBoxEditingControl;
    comboBox.GcMultiRow.CurrentRow.Cells["labelCell1"].Value = comboBox.Items[comboBox.SelectedIndex].ToString();
    comboBox.GcMultiRow.CurrentRow.Cells["labelCell2"].Value = comboBox.SelectedIndex;
}

private void gcMultiRow1_CellEndEdit(object sender, GrapeCity.Win.MultiRow.CellEndEditEventArgs e)
{
    // Delete the event of cell edit control
    if (this._comboBoxEditingControl1 != null)
    {
        this._comboBoxEditingControl1.SelectedIndexChanged -= new EventHandler(_comboBoxEditingControl1_SelectedIndexChanged);
        this._comboBoxEditingControl1 = null;
    }
}