c# CF, WinForms and double buffer

Question

Hi!

I have a CF 2.0 app with a PictureBox on a Form. I want to move the PictureBox with mouse move and I need to add Double Buffer to the form to avoid flickering.

How can I do this?

Thanks!

Answer 1

You don't need the Form double-buffered, you need the PB to be. That's not so easy to come by in CF. However, you could create your own control, PB is pretty simple. For example:

using System;
using System.Drawing;
using System.Windows.Forms;

public class MyPictureBox : Control {
  private Image mImage;
  public Image Image {
    get { return mImage; }
    set { mImage = value; Invalidate(); }
  }
  protected override void OnPaintBackground(PaintEventArgs pevent) {
    // Do nothing
  }
  protected override void OnPaint(PaintEventArgs e) {
    using (Bitmap bmp = new Bitmap(this.ClientSize.Width, this.ClientSize.Height)) {
      using (Graphics bgr = Graphics.FromImage(bmp)) {
        bgr.Clear(this.BackColor);
        if (mImage != null) bgr.DrawImage(mImage, 0, 0);
      }
      e.Graphics.DrawImage(bmp, 0, 0);
    }
    base.OnPaint(e);
  }
}

Hopefully, I didn't use stuff that isn't available in CF...