Fired when a cell requires to format its caption.
Type | Description | |||
Item as HITEM | A long expression that indicates the handle of the item being formatted. | |||
ColIndex as Long | A long expression that indicates the index of the column being formatted. | |||
Value as Variant | (By Reference) A Variant value that indicates the value being displayed in the cell. By default, the Value parameter is initialized with the CellCaption property. |
Use the FormatColumn event to display a string different than the CellCaption property. The FormatColumn event is fired only if the FireFormatColumn property of the Column is True. The FormatColumn event lets the user to provide the cell's caption before it is displayed on the control's list. For instance, the FormatColumn event is useful when the column cells contains prices( numbers ), and you want to display that column formatted as currency, like $50 instead 50. Also, you can use the FormatColumn event to display item's index in the column, or to display the result of some operations based on the cells in the item ( totals, currency conversion and so on ).
Syntax for FormatColumn event, /NET version, on:
private void FormatColumn(object sender,int Item,int ColIndex,ref object Value) { } Private Sub FormatColumn(ByVal sender As System.Object,ByVal Item As Integer,ByVal ColIndex As Integer,ByRef Value As Object) Handles FormatColumn End Sub |
private void FormatColumn(object sender, AxEXTREELib._ITreeEvents_FormatColumnEvent e) { } void OnFormatColumn(long Item,long ColIndex,VARIANT FAR* Value) { } void __fastcall FormatColumn(TObject *Sender,Extreelib_tlb::HITEM Item,long ColIndex,Variant * Value) { } procedure FormatColumn(ASender: TObject; Item : HITEM;ColIndex : Integer;var Value : OleVariant); begin end; procedure FormatColumn(sender: System.Object; e: AxEXTREELib._ITreeEvents_FormatColumnEvent); begin end; begin event FormatColumn(long Item,long ColIndex,any Value) end event FormatColumn Private Sub FormatColumn(ByVal sender As System.Object, ByVal e As AxEXTREELib._ITreeEvents_FormatColumnEvent) Handles FormatColumn End Sub Private Sub FormatColumn(ByVal Item As EXTREELibCtl.HITEM,ByVal ColIndex As Long,Value As Variant) End Sub Private Sub FormatColumn(ByVal Item As Long,ByVal ColIndex As Long,Value As Variant) End Sub LPARAMETERS Item,ColIndex,Value PROCEDURE OnFormatColumn(oTree,Item,ColIndex,Value) RETURN |
<SCRIPT EVENT="FormatColumn(Item,ColIndex,Value)" LANGUAGE="JScript"> </SCRIPT> <SCRIPT LANGUAGE="VBScript"> Function FormatColumn(Item,ColIndex,Value) End Function </SCRIPT> Procedure OnComFormatColumn HITEM llItem Integer llColIndex Variant llValue Forward Send OnComFormatColumn llItem llColIndex llValue End_Procedure METHOD OCX_FormatColumn(Item,ColIndex,Value) CLASS MainDialog RETURN NIL void onEvent_FormatColumn(int _Item,int _ColIndex,COMVariant /*variant*/ _Value) { } function FormatColumn as v (Item as OLE::Exontrol.Tree.1::HITEM,ColIndex as N,Value as A) end function function nativeObject_FormatColumn(Item,ColIndex,Value) return |
The following VB samples use the FormatCurrency function, to display a number as a currency. The FormatCurrency VB function returns an expression formatted as a currency value using the currency symbol defined in the system control panel.
Tree1.Columns("Freight").FireFormatColumn = True Tree1.Columns("Freight").HeaderBold = True Tree1.Columns("Freight").Alignment = RightAlignment
Private Sub Tree1_FormatColumn(ByVal Item As EXTREELibCtl.HITEM, ByVal ColIndex As Long, Value As Variant)
Value = FormatCurrency(Value, 2) ' The FormatCurrency is a VB function
End Sub
if the sample looks like following:
Tree1.Columns("Freight").FireFormatColumn = False Tree1.Columns("Freight").HeaderBold = True Tree1.Columns("Freight").Alignment = RightAlignment
For instance, you can use the FormatColumn event to display "Yes" or "No" caption for a boolean column. The following VB sample shows how to do it:
Private Sub Tree1_FormatColumn(ByVal Item As EXTREELibCtl.HITEM, ByVal ColIndex As Long, Value As Variant) Value = IIf(Value < 50, "Yes", "No") End Sub
The following VB sample displays the result of adding ( concatenating ) of two cells:
Private Sub Tree1_FormatColumn(ByVal Item As EXTREELibCtl.HITEM, ByVal ColIndex As Long, Value As Variant) With Tree1.Items Value = .CellCaption(Item, 0) + .CellCaption(Item, 1) End With End Sub
The following C++ sample displays a date column using a format like "Saturday, January 31, 2004":
void OnFormatColumnTree1(long Item, long ColIndex, VARIANT FAR* Value) { COleDateTime date( *Value ); COleVariant vtNewValue( date.Format( _T("%A, %B %d, %Y") ) ); VariantCopy( Value, vtNewValue ); }
The following VB.NET sample displays a date column using LongDate format:
Private Sub AxTree1_FormatColumn(ByVal sender As Object, ByVal e As AxEXTREELib._ITreeEvents_FormatColumnEvent) Handles AxTree1.FormatColumn e.value = DateTime.Parse(e.value).ToLongDateString() End Sub
The following C# sample displays a date column using LongDate format:
private void axTree1_FormatColumn(object sender, AxEXTREELib._ITreeEvents_FormatColumnEvent e) { e.value = DateTime.Parse(e.value.ToString()).ToLongDateString(); }
The following VFP sample displays the item's index using the FormatColumn event:
*** ActiveX Control Event *** LPARAMETERS item, colindex, value with thisform.Tree1.Items .DefaultItem = item value = .ItemToIndex(0) endwith
before running the sample please make sure that the :
application.AutoYield = .f.
is called during the Form.Init event.