protected override void OnDrawItem(DrawItemEventArgs e)
{
base.OnDrawItem(e);
//Draw original background and selection.
//You can remove this and draw your own background if you want.
e.DrawBackground();
e.DrawFocusRectangle();
if (e.Index >= 0 && e.Index < Items.Count)
{
ColorListBoxItem item = Items[e.Index];
if (item != null)
{
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
if (ShowImages && item.Image != null)
{
//Draw the image
e.Graphics.DrawImage(item.Image, e.Bounds.X, e.Bounds.Y, ItemHeight, ItemHeight);
}
}
//Draw the item text
DrawItemText(e, item);
}
}
private void DrawItemText(DrawItemEventArgs e, ColorListBoxItem item)
{
float x = 0;
float y = 0;
SizeF textSize = e.Graphics.MeasureString(item.Text, Font);
float w = textSize.Width;
float h = textSize.Height;
Rectangle bounds = e.Bounds;
//If we are showing images, make some room for them and adjust the bounds width.
if (ShowImages)
{
bounds.X += ItemHeight;
bounds.Width -= ItemHeight;
}
//Depending on which TextAlign is chosen, determine the x and y position of the text.
switch (TextAlign)
{
case ContentAlignment.BottomCenter:
x = bounds.X + (bounds.Width - w) / 2;
y = bounds.Y + bounds.Height - h;
break;
case ContentAlignment.BottomLeft:
x = bounds.X;
y = bounds.Y + bounds.Height - h;
break;
case ContentAlignment.BottomRight:
x = bounds.X + bounds.Width - w;
y = bounds.Y + bounds.Height - h;
break;
case ContentAlignment.MiddleCenter:
x = bounds.X + (bounds.Width - w) / 2;
y = bounds.Y + (bounds.Height - h) / 2;
break;
case ContentAlignment.MiddleLeft:
x = bounds.X;
y = bounds.Y + (bounds.Height - h) / 2;
break;
case ContentAlignment.MiddleRight:
x = bounds.X + bounds.Width - w;
y = bounds.Y + (bounds.Height - h) / 2;
break;
case ContentAlignment.TopCenter:
x = bounds.X + (bounds.Width - w) / 2;
y = bounds.Y;
break;
case ContentAlignment.TopLeft:
x = bounds.X;
y = bounds.Y;
break;
case ContentAlignment.TopRight:
x = bounds.X + bounds.Width - w;
y = bounds.Y;
break;
}
//Finally draw the text.
e.Graphics.DrawString(item.Text, Font, new SolidBrush(item.Color), x, y);
}
