RepositoryItemCheckedComboBoxEdit.DrawListBoxItem Event

Allows you to manually paint CheckedComboBoxEdit items.

Namespace: DevExpress.XtraEditors.Repository

Assembly: DevExpress.XtraEditors.v24.2.dll

Declaration

C#

[DXCategory("Events")]
public event ListBoxDrawItemEventHandler DrawListBoxItem

VB.NET

<DXCategory("Events")>
Public Event DrawListBoxItem As ListBoxDrawItemEventHandler

Event Data

The DrawListBoxItem event's data class is ListBoxDrawItemEventArgs. The following properties provide information specific to this event:

Property	Description
AllowDrawSkinBackground	Gets or sets whether the item background is colored according to the currently applied skin.
Appearance	Gets the appearance settings used to paint the item currently being processed.
Bounds	Gets the bounding rectangle of the item being painted.
Index	Gets the index of the item being painted.
Item	Gets the value of the processed item.
PaintArgs
State	Gets the state of the item being painted.

Remarks

The list box control enables you to custom paint its items. Handle the DrawListBoxItem event to override default item painting. This event is raised each time an item is about to be painted. The event parameter’s properties allow you to define the object used to paint the item’s boundaries, style and the index of the item. To get the item’s state (selected, checked, grayed, inactive, etc) and the value of the item being drawn, use the ListBoxDrawItemEventArgs.State and ListBoxDrawItemEventArgs.Item properties respectively.

Important

You must set the Handled property to true to override the default painting.

Example

The following sample code handles the BaseListBoxControl.DrawItem event to custom paint odd and even list box items. The event handler also custom paints the currently selected item.

C#

using DevExpress.XtraEditors;

private void listBoxControl1_DrawItem(object sender, DevExpress.XtraEditors.ListBoxDrawItemEventArgs e) {
    Brush evenItemBackBrush = Brushes.WhiteSmoke;
    Brush oddItemBackBrush = Brushes.LightBlue;
    Brush selectedItemBackBrush = Brushes.SteelBlue;
    string itemText = (sender as ListBoxControl).GetItemText(e.Index);
    if ((e.State & DrawItemState.Selected) != 0) {
        e.Cache.FillRectangle(selectedItemBackBrush, e.Bounds);
        using (Font f = new Font(e.Appearance.Font.Name, e.Appearance.Font.Size, FontStyle.Bold)) {
            e.Cache.DrawString(itemText, f, Brushes.White, e.Bounds, e.Appearance.GetStringFormat());
        }
        e.Handled = true;
        return;
    }
    if (e.Index % 2 == 0) {
        e.Cache.FillRectangle(evenItemBackBrush, e.Bounds);
    }
    else {
        e.Cache.FillRectangle(oddItemBackBrush, e.Bounds);
    }
    e.Cache.DrawString(itemText, e.Appearance.Font, Brushes.Black, e.Bounds, e.Appearance.GetStringFormat());
    e.Handled = true;
}

VB.NET

Private Sub ListBoxControl1_DrawItem(sender As Object, e As DevExpress.XtraEditors.ListBoxDrawItemEventArgs) Handles ListBoxControl1.DrawItem
    Dim evenItemBackBrush As Brush = Brushes.WhiteSmoke
    Dim oddItemBackBrush As Brush = Brushes.LightBlue
    Dim selectedItemBackBrush As Brush = Brushes.SteelBlue
    Dim itemText As String = (TryCast(sender, ListBoxControl)).GetItemText(e.Index)
    If (e.State And DrawItemState.Selected) <> 0 Then
        e.Cache.FillRectangle(selectedItemBackBrush, e.Bounds)
        Using f As Font = New Font(e.Appearance.Font.Name, e.Appearance.Font.Size, FontStyle.Bold)
            e.Cache.DrawString(itemText, f, Brushes.White, e.Bounds, e.Appearance.GetStringFormat())
        End Using
        e.Handled = True
        Return
    End If
    If e.Index Mod 2 = 0 Then
        e.Cache.FillRectangle(evenItemBackBrush, e.Bounds)
    Else
        e.Cache.FillRectangle(oddItemBackBrush, e.Bounds)
    End If
    e.Cache.DrawString(itemText, e.Appearance.Font, Brushes.Black, e.Bounds, e.Appearance.GetStringFormat())
    e.Handled = True
End Sub