Custom Drawing in a UserControl

  • Thread starter Thread starter Zachary Turner
  • Start date Start date
Z

Zachary Turner

I have an object derived from UserControl which I place on my form.
The UserControl handles the OnPaint event for itself, so that I can do
custom drawing of my control. I have a problem with this custom
drawing, I'm hoping someone can provide some insight.

I placed my control on the page about 100 times using a loop similar to
the following:

System.Collections.Generic.List<System.Windows.Forms.Control> Controls
= new System.Collections.Generic.List<System.Windows.Forms.Control>();
for (int Row = 0; Row < Height; ++Row)
for (int Col = 0; Col < Width; ++Col)
Controls.Add(new MyControl()); //Other initialization (size,
position, etc) is handled, just snipped for clarity

this.Panel.SuspendLayout();
this.Panel.Controls.AddRange(Controls.ToArray());
this.Panel.ResumeLayout(false);

In the OnPaint event of MyControl, I do the following:


private void MyControl_Paint(object sender,
System.Windows.Forms.PaintEventArgs e)
{
e.Graphics.DrawLine(LinePen, this.Location, this.Location +
this.Size);
}

The problem is, the line only gets drawn on the very first control I
placed onto the page. I can verify that the other controls are
actually having their OnPaint handler called and that this.Location and
this.Size are correct, but I just don't see the line get drawn. Is
there something obvious I'm missing?

Thanks
 
btw, for some reason the ClipRectangle is always set to 0, 0, 0, 0 on
all calls to MyControl_Paint except for the first control.
 
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