We use cookies to give you the best experience on our website. If you continue to browse, then you agree to our privacy policy and cookie policy.
public UserControl()
{
// This call is required by the Windows.Forms Form Designer.
InitializeComponent();
this.label1.Hide();
this.label2.Hide();
this.label3.Hide();
this.panel1.Paint += new PaintEventHandler(panel1_Paint);
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawString(this.label1.Text, this.label1.Font, Brushes.Black, this.label1.Location.X, this.label1.Location.Y);
e.Graphics.DrawString(this.label2.Text, this.label2.Font, Brushes.Black, this.label2.Location.X, this.label2.Location.Y);
e.Graphics.DrawString(this.label3.Text, this.label3.Font, Brushes.Black, this.label3.Location.X, this.label3.Location.Y);
}
//in OnInitialize
MakeUnBuffered(this.panel1);
//method
private void MakeUnBuffered(Control c)
{
System.Reflection.MethodInfo mInfo = typeof(Control).GetMethod("SetStyle",
System.Reflection.BindingFlags.Instance |
System.Reflection.BindingFlags.InvokeMethod |
System.Reflection.BindingFlags.NonPublic);
if(mInfo != null)
{
mInfo.Invoke(c, new object[]{ControlStyles.DoubleBuffer, false});
}
if(c.Controls.Count > 0)
{
foreach (Control c1 in c.Controls)
{
c1.CausesValidation = false;
MakeUnBuffered(c1);//recursive call
}
}
}
You can see a sample use of this technique in the grid\samples\databound\repeatercontrol sample.
private void Form1_Load(object sender, System.EventArgs e)
{
//UserControl uc = new UserControl();
//Label l = new Label();
Panel uc = new Panel();
Label l = new CustomLabelWithBackColor();
//MakeUnBuffered(l);
l.Text = "Text";
l.BackColor = Color.Red;
l.Bounds = new Rectangle(5, 5, 50, 50);//DockStyle.Fill;
uc.Controls.Add(l);
this.gridControl1[2,2].CellType = "Control";
this.gridControl1[2,2].Control = uc;
this.gridControl1.RowHeights[2] = 50;
this.gridControl1.ColWidths[2] = 100;
}
public class CustomLabelWithBackColor : Label
{
protected override void OnPaint(PaintEventArgs e)
{
// either do manually call OnPaintBackground
this.OnPaintBackground(e);
// or simply draw background here
// using (SolidBrush brush = new SolidBrush(BackColor))
// {
// e.Graphics.FillRectangle(brush, e.ClipRectangle);
// }
base.OnPaint (e);
}
}
