c# listboxitem wpf - Background color of a ListBox item (winforms)




2 Answers

Thanks for the answer by Grad van Horck, it guided me in the correct direction.

To support text (not just background color) here is my fully working code:

//global brushes with ordinary/selected colors
private SolidBrush reportsForegroundBrushSelected = new SolidBrush(Color.White);
private SolidBrush reportsForegroundBrush = new SolidBrush(Color.Black);
private SolidBrush reportsBackgroundBrushSelected = new SolidBrush(Color.FromKnownColor(KnownColor.Highlight));
private SolidBrush reportsBackgroundBrush1 = new SolidBrush(Color.White);
private SolidBrush reportsBackgroundBrush2 = new SolidBrush(Color.Gray);

//custom method to draw the items, don't forget to set DrawMode of the ListBox to OwnerDrawFixed
private void lbReports_DrawItem(object sender, DrawItemEventArgs e)
{
    e.DrawBackground();
    bool selected = ((e.State & DrawItemState.Selected) == DrawItemState.Selected);

    int index = e.Index;
    if (index >= 0 && index < lbReports.Items.Count)
    {
        string text = lbReports.Items[index].ToString();
        Graphics g = e.Graphics;

        //background:
        SolidBrush backgroundBrush;
        if (selected)
            backgroundBrush = reportsBackgroundBrushSelected;
        else if ((index % 2) == 0)
            backgroundBrush = reportsBackgroundBrush1;
        else
            backgroundBrush = reportsBackgroundBrush2;
        g.FillRectangle(backgroundBrush, e.Bounds);

        //text:
        SolidBrush foregroundBrush = (selected) ? reportsForegroundBrushSelected : reportsForegroundBrush;
        g.DrawString(text, e.Font, foregroundBrush, lbReports.GetItemRectangle(index).Location);
    }

    e.DrawFocusRectangle();
}

The above adds to the given code and will show the proper text plus highlight selected item.

how to change

How can I set the background color of a specific item in a System.Windows.Forms.ListBox? I would like to be able to set multiple ones if possible.




     public Picker()
    {
        InitializeComponent();
        this.listBox.DrawMode = DrawMode.OwnerDrawVariable;
        this.listBox.MeasureItem += listBoxMetals_MeasureItem;
        this.listBox.DrawItem += listBoxMetals_DrawItem;
    }

    void listBoxMetals_DrawItem(object sender, DrawItemEventArgs e)
    {
        e.DrawBackground();
        Brush myBrush = Brushes.Black;
        var item = listBox.Items[e.Index] as Mapping;
        if (e.Index % 2 == 0)
        {
            e.Graphics.FillRectangle(new SolidBrush(Color.GhostWhite), e.Bounds);
        }
        e.Graphics.DrawString(item.Name,
            e.Font, myBrush, e.Bounds, StringFormat.GenericDefault);
        e.DrawFocusRectangle();
    }

Complete sample




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