richTextBoxFontClass

使用

private void button1_Click(object sender, EventArgs e)

{

    RichTextBoxCtrl.richTextBoxFontClass r = new RichTextBoxCtrl.richTextBoxFontClass();

    r.richTextBox = richTextBox1;

    r.ToggleBold();

}

 

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Drawing;



////使用

//RichTextBoxCtrl.richTextBoxFontClass r = new RichTextBoxCtrl.richTextBoxFontClass();

//r.richTextBox = richTextBox1;

//r.ToggleBold();



namespace RichTextBoxCtrl

{

    class richTextBoxFontClass

    {

       

        public richTextBoxFontClass()

        {

            richTextBox = new RichTextBox();

        }

        public RichTextBox richTextBox;



        //粗体

        public void ToggleBold()

        {

            if (richTextBox.SelectionFont == null)

                richTextBox.SelectionFont = richTextBox.Font;



            FontStyle style = richTextBox.SelectionFont.Style;



            if (richTextBox.SelectionFont.Bold)



                style &= ~FontStyle.Bold;//恢复正常

            else

                style |= FontStyle.Bold;



            richTextBox.SelectionFont = new Font(richTextBox.SelectionFont, style);

        }



        //斜体

        public void ToggleItalic()

        {

            if (richTextBox.SelectionFont == null)

                richTextBox.SelectionFont = richTextBox.Font;



            FontStyle style = richTextBox.SelectionFont.Style;



            if (richTextBox.SelectionFont.Italic)

                style &= ~FontStyle.Italic;//恢复正常

            else

                style |= FontStyle.Italic;



            richTextBox.SelectionFont = new Font(richTextBox.SelectionFont, style);

        }



        //下划线

        public void ToggleUnderLine()

        {

            if (richTextBox.SelectionFont == null)

                richTextBox.SelectionFont = richTextBox.Font;



            FontStyle style = richTextBox.SelectionFont.Style;



            if (richTextBox.SelectionFont.Underline)

                style &= ~FontStyle.Underline;//恢复正常

            else

                style |= FontStyle.Underline;



            richTextBox.SelectionFont = new Font(richTextBox.SelectionFont, style);

        }



        //删除线

        public void ToggleStrikeout()

        {

            if (richTextBox.SelectionFont == null)

                richTextBox.SelectionFont = richTextBox.Font;



            FontStyle style = richTextBox.SelectionFont.Style;



            if (richTextBox.SelectionFont.Strikeout)

                style &= ~FontStyle.Strikeout;//恢复正常

            else

                style |= FontStyle.Strikeout;

            richTextBox.SelectionFont = new Font(richTextBox.SelectionFont, style);

        }

    }

}