How-to-Hide-Custom-Option-in-the-FilterBar-DropDow | Windows Forms

3 Jan 2020 / 8 minutes to read

To achieve this, you need to implement custom FilterBar cell deriving CellModel/CellRenderer from GridTableFilterBarCellModel/GridTableFilterBarCellRenderer.

GridTableFilterBarCellModel.FillWithChoices method is overridden to remove the string “Custom” from the list.
GridTableFilterBarCellModel.Select method is rewritten with Select_WithoutCustom method, which specifies the index for the selected item. You can pass the index for the “Custom” selected item as 0.
GridTableFilterBarCellModel.ListBoxMouseUp() method is overridden to invoke Select_WithoutCustom method instead of the Select method.

c#
vb
public class GridTableFilterBarCellModel1: GridTableFilterBarCellModel
{
    public GridTableFilterBarCellModel1(Syncfusion.Windows.Forms.Grid.GridModel gm):base(gm)
    {
    }

//Overrides FillWithChoices to remove 'Custom' option from the list.
    public override void FillWithChoices(ListBox listBox, GridStyleInfo style, out bool exclusive)
    {
       exclusive = true;
       GridTableCellStyleInfo tableStyleInfo = (GridTableCellStyleInfo) style;
       object[] items = (object[]) GetFilterBarChoices(tableStyleInfo.TableCellIdentity);
       listBox.Items.Clear();
       if (items != null)
       {
            listBox.Items.Add(SelectAllText);
            foreach (object item in items)
            {
                 if (item is DBNull)
                 listBox.Items.Add(SelectEmptyText);
                 else if (item != null)
                 listBox.Items.Add(style.GetFormattedText(item));
            }
       }
    }

//Customizes the 'Select' method to hide the Custom option.
    public void Select_WithoutCustom(GridTableCellStyleInfoIdentity tableCellIdentity, int index)
    {
        if (index >= 0)
        {
           if (index == 0)
           {
                   ResetFilterBar(tableCellIdentity);
           }
           else if (index == 1)
           {
                SelectItem(tableCellIdentity, 0); 
           }
           else
           {
                SelectItem(tableCellIdentity, index-1);
           }
        }
    }
    public override GridCellRendererBase CreateRenderer(GridControlBase control)
    {
            return new CellRenderer(control, this); 
    }
}
public class CellRenderer : GridTableFilterBarCellRenderer
{
      public CellRenderer(GridControlBase grid, GridCellModelBase cellModel): base(grid , cellModel)
     {
     }
          public new Model.Form1.GridTableFilterBarCellModel1 Model
          {
              get
             {
                 return (Model.Form1.GridTableFilterBarCellModel1) base.Model;
             }
      }


//Overrides ListBoxMouseUP method to call Customized Select method instead of the usual 'Select' method.
      protected override void ListBoxMouseUp(object sender, MouseEventArgs e)
      {
          CurrentCell.CloseDropDown(PopupCloseType.Done);
          GridTableCellStyleInfo tableStyleInfo = (GridTableCellStyleInfo) this.StyleInfo;
          GridTableCellStyleInfoIdentity tableCellIdentity = tableStyleInfo.TableCellIdentity;
          Model.Select_WithoutCustom(tableCellIdentity, this.ListBoxPart.SelectedIndex);

//Does not call base class - ignores. 
          SetTextBoxText(GetFilterBarText(StyleInfo), false);
      }
}
Public Class GridTableFilterBarCellModel1: Inherits GridTableFilterBarCellModel 
Public Sub New(ByVal gm As Syncfusion.Windows.Forms.Grid.GridModel) 
MyBase.New(gm) 
End Sub 

'Overrides FillWithChoices to remove 'Custom' option from the list.
Public Overrides Sub FillWithChoices(ByVal listBox As ListBox, ByVal style As GridStyleInfo, &lt;System.Runtime.InteropServices.Out()&gt;     ByRef exclusive As Boolean) 
exclusive = True 
Dim tableStyleInfo As GridTableCellStyleInfo = CType(style, GridTableCellStyleInfo) 
Dim items As Object() = CType(GetFilterBarChoices(tableStyleInfo.TableCellIdentity), Object()) 
listBox.Items.Clear() 
If Not items Is Nothing Then 
listBox.Items.Add(SelectAllText) 
For Each item As Object In items 
If TypeOf item Is DBNull Then 
listBox.Items.Add(SelectEmptyText) 
Else If Not item Is Nothing Then 
listBox.Items.Add(style.GetFormattedText(item))
End If 
Next item 
End If 
End Sub

'Customizes the 'Select' method to hide the Custom option. 
Public Sub Select_WithoutCustom(ByVal tableCellIdentity As GridTableCellStyleInfoIdentity, ByVal index As Integer) 
If index >= 0 Then 
If index = 0 Then 
ResetFilterBar(tableCellIdentity) 
Else If index = 1 Then 
SelectItem(tableCellIdentity, 0) 
Else 
SelectItem(tableCellIdentity, index-1) 
End If 
End If 
End Sub 
Public Overrides Function CreateRenderer(ByVal control As GridControlBase) As GridCellRendererBase 
Return New CellRenderer(control, Me) 
End Function 
End Class 
Public Class CellRenderer : Inherits GridTableFilterBarCellRenderer 
Public Sub New(ByVal grid As GridControlBase, ByVal cellModel As GridCellModelBase) 
MyBase.New(grid, cellModel) 
End Sub 
Public Shadows ReadOnly Property Model() As Model.Form1.GridTableFilterBarCellModel1 
Get 
Return CType(MyBase.Model, Model.Form1.GridTableFilterBarCellModel1) 
End Get 
End Property 

'Overrides ListBoxMouseUP method to call Customized Select method instead of the usual 'Select' method.
Protected Overrides Sub ListBoxMouseUp(ByVal sender As Object, ByVal e As MouseEventArgs) 
CurrentCell.CloseDropDown(PopupCloseType.Done) 
Dim tableStyleInfo As GridTableCellStyleInfo = CType(Me.StyleInfo, GridTableCellStyleInfo) 
Dim tableCellIdentity As GridTableCellStyleInfoIdentity = tableStyleInfo.TableCellIdentity 
Model.Select_WithoutCustom(tableCellIdentity, Me.ListBoxPart.SelectedIndex) 

'Does not call base class - ignores. 
SetTextBoxText(GetFilterBarText(StyleInfo), False) 
End Sub 
End Class

How to Hide Custom Option in the FilterBar DropDown