Pls Hlp: How can I make my custom labels have transparent backgrounds

[ShakeDoctor]

Hi, I have a custom label control which is clickable.
However, the background of the label is white, and you can't set it to
transparent in the property window because it says it is not supported.

Here is the code, what do i need to add to make the BackColor transparent?


public class CustomLabel : Control
{
public ContentAlignment TextAlignment = ContentAlignment.TopLeft;

public CustomLabel()
{
}

protected override void OnPaintBackground(PaintEventArgs e)
{
base.OnPaintBackground (e);
}

protected override void OnPaint(PaintEventArgs e)
{
Graphics graphics = e.Graphics;

SolidBrush brush = new SolidBrush(this.ForeColor);
SizeF s;

s = graphics.MeasureString(this.Text, this.Font);

switch (this.TextAlignment)
{
case ContentAlignment.TopCenter:
graphics.DrawString(this.Text, this.Font, brush, (this.Width - s.Width)
/ 2,(this.Height - s.Height) / 2);
break;

case ContentAlignment.TopLeft:
graphics.DrawString(this.Text, this.Font, brush, 2, (this.Height -
s.Height)/ 2);
break;

case ContentAlignment.TopRight:
graphics.DrawString(this.Text, this.Font, brush, this.Width - s.Width -
2,(this.Height - s.Height) / 2);
break;
}

brush.Dispose();

base.OnPaint (e);
}

public override string Text
{
get {return base.Text;}
set
{
base.Text = value;
//Force to repaint
this.Invalidate();
}
}

 

[Chris Tacke, eMVP]

Searchthe newsgroup archives. This has been covered extensively.

--
Chris Tacke
Co-founder
OpenNETCF.org
Has OpenNETCF helped you? Consider donating to support us!
http://www.opennetcf.org/donate

 

[Paul G. Tobey [eMVP]]

Have you looked in the newsgroup archives before posting?

http://groups-beta.google.com/group...tframework?hl=en&lr=lang_en&ie=UTF-8&oe=UTF-8

Paul T.

 

[ShakeDoctor]

yes of course I have, and the only information I could find was adding this
to the controls constructor:

SetStyle(ControlStyles.SupportsTransparentBackColor, true);

BackColor =
System.Drawing.Color.FromArgb(0,System.Drawing.Color.Transparent);

However, the ControlStyles enumeration isn't available as far as I know.

So the only way of achieving it is to not paint the background at all? or
paint the background as the colour you want (i.e. not real transparency)

 

[Paul G. Tobey [eMVP]]

What did you search on? How about "transparent label", without the quotes,
of course...

http://groups-beta.google.com/group...ansparent+label&rnum=2&hl=en#914a15e99739e4aa

Paul T.

 

[ShakeDoctor]

hmmm, that link isn't too handy.

And if I do a search for "transparent label", they all seem to be people
trying to draw text over a picturebox.

Normal labels seem to have a transparent background already, its just my
clickable label doesn't.