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

问题:

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

richTextBox1.SelectionFont = new Font("Tahoma", 12, FontStyle.Bold); richTextBox1.SelectionColor = System.Drawing.Color.Red; 

I also want to add some buttons for Bold, Italic, etc using:

richTextBox1.SelectionFont = new Font("Tahoma", 12, FontStyle.Italic); 

But if I have a Bold option, this code will remove the Bold and add Italic. How can I retain the Bold and Italic?

Thanks!

回答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 ;-)

回答2:

use this code

richTextBox1.Font = new Font("Tahoma", 12, FontStyle.Bold | FontStyle.Italic); 

回答3:

This Works for me hope it will help you guys...

private void cmdBold_Click(object sender, EventArgs e) {    Font new1, old1;    old1 = rtxtBox.SelectionFont;    if (old1.Bold)       new1 = new Font(old1, old1.Style & ~FontStyle.Bold);    else       new1 = new Font(old1, old1.Style | FontStyle.Bold);     rtxtBox.SelectionFont = new1;    rtxtBox.Focus(); }  private void cmdItalic_Click(object sender, EventArgs e) {   Font new1, old1;   old1 = rtxtBox.SelectionFont;   if (old1.Italic)     new1 = new Font(old1, old1.Style & ~FontStyle.Italic);   else     new1 = new Font(old1, old1.Style | FontStyle.Italic);    rtxtBox.SelectionFont = new1;          rtxtBox.Focus(); }  private void cmdUnderline_Click(object sender, EventArgs e) {   Font new1, old1;   old1 = rtxtBox.SelectionFont;   if (old1.Underline)     new1 = new Font(old1, old1.Style & ~FontStyle.Underline);   else     new1 = new Font(old1, old1.Style | FontStyle.Underline);    rtxtBox.SelectionFont = new1;   rtxtBox.Focus(); } 

Font Size

private void cmbSize_KeyPress(object sender, KeyPressEventArgs e)     {       if (e.KeyChar == 13)       {         if (float.Parse(cmbSize.Text.Trim()) == 0)         {           MessageBox.Show("Invalid Font Size, it must be Float Number", "Invalid Font Size", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);           cmbSize.Text = "10";           return;         }         if (cmbSize.Text.Trim() != "")         {           Font new1, old1;           old1 = rtxtBox.SelectionFont;           new1 = new Font(FontFamily.GenericSansSerif, float.Parse(cmbSize.Text.Trim()), old1.Style);           rtxtBox.SelectionFont = new1;         }         rtxtBox.Focus();       }     } 

回答4:

you need to do something like this..

in order ot make it italic.

 richTextBox1.SelectionFont = new Font("Tahoma", 12, richTextBox1.SelectionFont.Style | FontStyle.Italic); 

//in order to make it bold

richTextBox1.SelectionFont = new Font("Tahoma", 12, richTextBox1.SelectionFont.Style | FontStyle.Bold); 

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