Custom paint comboboxadv and combodropdown

[Christian Rattat]

Hi,

I need to custom paint the dropdown button of combodropdown and comboboxadv controls. Is there any way to do that? I use SF Suite 4.2

Thanks in advance,
Christian

[J.Nagarajan]

Hi Christian ,

Thanks for your interest in Syncfusion products.

If your intention is to change the DropDownButton''s color of the ComboBoxAdv control, then you have to derive ComboBoxAdv class, and you can handle Onpaint event of this control. Please refer to the following code snippet.

[C#]

 public class CustomCombo : Syncfusion.Windows.Forms.Tools.ComboBoxAdv
    {
        public CustomCombo()
        {
            
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            Rectangle rect= (Rectangle)this.DropDownButton.Bounds;
            base.OnPaint(e);
           Point[] curvePoints1 = { new Point(199, 5),new Point(203, 10), new Point(207, 5) };
            
            e.Graphics.DrawRectangle(Pens.Red, rect);
            e.Graphics.FillRectangle(Brushes.Red, rect);
          
            e.Graphics.DrawPolygon(Pens.Blue, curvePoints1);
            e.Graphics.FillPolygon(Brushes.Blue, curvePoints1);
            
        }
      
    }

Please refer to the attached sample from the following page.

http://websamples.syncfusion.com/samples/Tools.Windows/F70337/main.htm

Let me know if you have any questions.

Regards,
Nagaraj

[Christian Rattat]

Hi,

sure this is a solution but that would force me to replace around 500 controls in 200 existing dialogs. Is there a way to do similar without derived class?

Thanks,
Christian

[Christian Rattat]

Hi,

any other ideas?

Thanks,
Christian

[J.Nagarajan]

Hi Christian ,

To change the DropDownButton's color of the ComboBoxAdv control, you have to handle its Paint event. Please refer to the following code snippet.

[C#]

void comboBoxAdv1_Paint(object sender, PaintEventArgs e)
        {
            Graphics grph = e.Graphics;
            grph.DrawRectangle(Pens.Red, (Rectangle)(this.comboBoxAdv1.DropDownButton.Bounds));
            grph.FillRectangle(Brushes.Red, (Rectangle)(this.comboBoxAdv1.DropDownButton.Bounds));

            Point[] curvePoints1 = { new Point(199, 5), new Point(203, 10), new Point(207, 5) };

            e.Graphics.DrawPolygon(Pens.Blue, curvePoints1);
            e.Graphics.FillPolygon(Brushes.Blue, curvePoints1);
        }

I hope this will meet your requirement. Please let me know if you have any questions.

Thanks,
Nagaraj

[Christian Rattat]

This was the right hint!

Thanks a lot,
Christian