Occurs before a cell enters edit mode.
[Visual Basic]
Public Event BeforeColEdit As BeforeColEditEventHandler
[C#]
public event BeforeColEditEventHandler BeforeColEdit
[Delphi]
public property BeforeColEdit: BeforeColEditEventHandler read remove_BeforeColEdit write add_BeforeColEdit;
Example
Assume a Boolean field called Done exists, and its C1DataColumn.NumberFormat property is set to specify Yes/No as the display format. Further assume that, when the user presses Y or N, the cell contents change immediately instead of entering edit mode. This process is accomplished in BeforeColEdit as follows:
Private Sub C1TrueDBGrid1_BeforeColEdit(ByVal sender As Object, ByVal e As C1.Win.C1TrueDBGrid.BeforeColEditEventArgs) Handles C1TrueDBGrid1.BeforeColEdit
With Me.C1TrueDBGrid1.Columns(e.ColIndex)
' If this isn't the "Done" column, or if the user clicked with the mouse, then simply continue.
If .DataField <> "Done" Or e.KeyChar = Chr(0) Then
Exit Sub
' Cancel normal editing and set the field to the proper result based upon KeyAscii. Beep if an invalid character was typed.
e.Cancel = True
Select Case UCase(e.KeyChar)
Case "Y"
.Value = -1
Case "N"
.Value = 0
Case Else
Beep()
End Select
End With
End Sub
· C#
private void c1TrueDBGrid1_BeforeColEdit(object sender, C1.Win.C1TrueDBGrid.BeforeColEditEventArgs e)
{
C1.Win.C1DataColumn col = e.Column.DataColumn;
// If this isn't the "Done" column, or if the user clicked with the mouse, then simply continue.
if (col.DataField != "Done" || e.KeyChar == 0 )
{
return;
}
// Cancel normal editing and set the field to the proper result based upon KeyAscii. Beep if an invalid character was typed.
e.Cancel = true;
switch (e.KeyChar. .ToUpper())
{
case "Y";
Col.Value = -1;
break;
case "N";
Col.Value = 0;
default:;
Beep();
}
}
· Delphi
procedure TWinForm.c1TrueDBGrid1_BeforeColEdit(sender: System.Object; e: C1.Win.C1TrueDBGrid.BeforeColEditEventArgs);
begin
with Self.C1TrueDBGrid1.Columns[e.ColIndex] do
begin
// If this isn't the 'Done' column, or if the user clicked with the mouse, then simply continue.
if (DataField <> 'Done') Or (e.KeyChar = Char(0)) Then
Exit;
// Cancel normal editing and set the field to the proper result based upon KeyAscii. Beep if an invalid character was typed.
e.Cancel := True;
if (char.ToUpper(e.KeyChar) = 'Y') then
Value := -1;
else if (char.ToUpper(e.KeyChar) = 'N') then
Value := 0;
end;
end;
For details on the BeforeColEdit event, see the Changing Cell Contents with a Single Keystroke topic.
See Also
C1TrueDBGrid Class | C1TrueDBGrid Members | C1.Win.C1TrueDBGrid Namespace
|
Send comments about this topic to ComponentOne. Copyright © ComponentOne LLC. All rights reserved. |