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creating custom highlight/selection colors with windows from controls in C# and .NET

Posted on 2009-05-08
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Last Modified: 2013-12-14
I am trying to create custom highlight colors for menus and listboxes.  So as the selection movs my colors are used to highlight instead of the system colors.

Thank you for any help you can provide.

I tried this but it all it does is over cover up the highlighted element with th enew color, cannot ready the text anymore:

   private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            int i = listBox1.SelectedIndex;
            Rectangle rc = listBox1.GetItemRectangle(i);
            SolidBrush myBrush = new SolidBrush(Color.Beige);
            Graphics g = Graphics.FromHwnd(listBox1.Handle);
            g.FillRectangle(myBrush, rc);
        }
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Question by:jongund
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5 Comments
 
LVL 13

Expert Comment

by:kaylanreilor
ID: 24346910
Did you have a look to the Graphics class and its methods to understand what is going on ?... or don't you think that using something else than a SolidBrush could solve the issue ?
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LVL 13

Expert Comment

by:kaylanreilor
ID: 24346931
It is probably because the default behavior of the listbox is to draw the text in white when selected.
Perhaps you have to redraw the text as well depending on the colors you choose.
For example if you write the following code to make the color transparent you'll see something:
        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            int i = listBox1.SelectedIndex;
            Rectangle rc = listBox1.GetItemRectangle(i);
            Color customColor = Color.FromArgb(90, Color.Red);
            SolidBrush myBrush = new SolidBrush(customColor);
            Graphics g = Graphics.FromHwnd(listBox1.Handle);
            g.FillRectangle(myBrush, rc);
        }

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LVL 13

Accepted Solution

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kaylanreilor earned 2000 total points
ID: 24346966
OK, I've checked, I was right : depending on the color you choose you have to redraw the string accordingly. The following code gives you an example.
The previous code I posted give you the possibility to add some transparency.
The following MSDN link give you the oportunity to go deeper and create your custom listbox if you want to have more controle on drawing stuffs but it seems that you don't want to go so deep:
http://msdn.microsoft.com/en-us/library/system.windows.forms.listbox.objectcollection.aspx
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    int i = listBox1.SelectedIndex;
    Rectangle rc = listBox1.GetItemRectangle(i);
    SolidBrush myBrush = new SolidBrush(Color.Beige);
    Graphics g = Graphics.FromHwnd(listBox1.Handle);
    g.FillRectangle(myBrush, rc);
    g.DrawString(listBox1.Items[i].ToString(), this.Font, Brushes.Black, rc);
}

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LVL 13

Expert Comment

by:kaylanreilor
ID: 24381826
Hey, 4 days ago I told you that you just have to add this line of code:
g.DrawString(listBox1.Items[i].ToString(), this.Font, Brushes.Black, rc);
May you at least tell us if you agree with this solution so that other people who may be interested by this issue could know if this working ?
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LVL 13

Expert Comment

by:kaylanreilor
ID: 24553841
Dispite my solution works (ID#24346966), jongund didn't take the time to answer. I re-ask him to confirm that. Nevertheless he didn't care.
Since my solution works, I should get the points. After all he got what he needed.
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