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RichTextBox BackgroundImage or alternatives

Posted on 2009-05-14
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2,406 Views
Last Modified: 2013-12-17
I've created a program that I wanted to add skins to. Of course the label has a built in backgroundImage property, however richtextboxes don't... I successfully got overwrote the onpaint handler for the textbox but it doesn't paint the text over the background, I can only assume that somewhere along the way the background is getting painted over the text when the control is redrawn.

If there is an alternative control that allows me to format multiple lines of text with different font styles and colors, please do tell....otherwise i'm stuck trying to figure out how to get a background image on these things for my friend to make skins for my program.

Here's the code that works, but obviously not well enough:
public class myRichTextBox : RichTextBox
	{
		private Image IMAGE = Image.FromFile(Application.StartupPath + @"\custom\realTimeDisplay.jpg");
 
		public myRichTextBox()
		{
			base.SetStyle(ControlStyles.UserPaint, true);
		}
 
		public override Image BackgroundImage
		{
			get
			{
				return IMAGE;
			}
			set
			{
				IMAGE = value;
			}
		}
 
		protected override void OnPaint(PaintEventArgs e)
		{
			base.OnPaint(e);
		}
	}

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Question by:Nitinol
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Expert Comment

by:CuteBug
ID: 24383228
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Author Comment

by:Nitinol
ID: 24391800
I've found another solution, but when I set the selected text, it overlaps over the text...

Is there a way to keep it from overlapping?
	public class TransparentRichTextBox : RichTextBox
	{
		public TransparentRichTextBox()
		{
			base.ScrollBars = RichTextBoxScrollBars.None;
		}
 
		override protected CreateParams CreateParams
		{
			get
			{
				CreateParams cp = base.CreateParams;
				cp.ExStyle |= 0x20;
				return cp;
			}
		}
 
		override protected void OnPaintBackground(PaintEventArgs e)
		{
		}
	}

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Author Comment

by:Nitinol
ID: 24392747
Anyone out there who can help me with the overlapping text problem when scrolling? Why is it so hard to put a background image on a box, when labels and other controls do it so easily?

I will also accept alternative controls that might do what I need them to do.

Thanks in advance.
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Accepted Solution

by:
Nitinol earned 0 total points
ID: 24393599
well I decided to go with listview's instead since it appears i'm not going to get any help with transparency for the richtextbox.

Oh well. I tried. I've browsed about every post ever made on how to get a textbox to scroll once it's transparent, but with no luck.
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