RichTextBox font style button for Bold and/or Italic (how to code so more than one can be chosen instead of replacing

Question

Right now I am using some buttons with the following code:

richTextBox1.SelectionFont = new Font(\"Tahoma\", 12, FontStyle.Bold);
richTextBox1.SelectionColor = S         


        

Answer 1

What you really need to change both existing and coming text is this:

if (richTextBox2.SelectionLength > 0 ) richTextBox2.SelectionFont =
 new Font(richTextBox1.SelectionFont, FontStyle.Bold | richTextBox1.SelectionFont.Style);
else richTextBox2.Font =
 new Font(richTextBox1.Font, FontStyle.Bold | richTextBox1.Font.Style);

Note that in order to work the selection must not have a mix of styles..

Also you probably ought to use CheckBoxes with Appearence=Button

If you are using those CheckBoxes make sure you don't code their default event CheckedChanged as this would also fire when you set their state in code!

To switch a Style on and off you can use maybe code like this in the Click events of the style boxes:

FontStyle style = checkBox1.CheckState == CheckState.Checked ? 
                    FontStyle.Italic : FontStyle.Regular;

if (richTextBox2.SelectionLength > 0) richTextBox2.SelectionFont =
    new Font(richTextBox1.SelectionFont, style | richTextBox1.SelectionFont.Style);
else richTextBox2.Font =
    new Font(richTextBox1.Font, style | richTextBox1.Font.Style);

This first decides on the new state to set and then set it.

note that I did not use the Checked Property of the CheckBox! To reflect a selection with a mix of bold and non-bold text we need a third state, so the CheckBoxes should have ThreeState=true.

Code to set the states on only two style boxes could look like this:

private void richTextBox2_SelectionChanged(object sender, EventArgs e)
{
   // mixed state:   
   if (richTextBox2.SelectionFont == null)
   {
     checkBox1.CheckState = CheckState.Indeterminate;
     checkBox2.CheckState = CheckState.Indeterminate;
     return;
   }
   checkBox1.Checked =
      (richTextBox2.SelectionFont.Style & FontStyle.Bold) == FontStyle.Bold;
   checkBox2.Checked =
      (richTextBox2.SelectionFont.Style & FontStyle.Italic) == FontStyle.Italic;
}

Starting to look a little larger than you thought at the beginning? Well, it is.. take your time!! (And we haven't even begun with Fonts and sizes ;-)