Trackbar control to change richtextbox font size?

Hi!
How should one go about changing the font size of the text in a richtextbox by sliding the trackbar? (bigger font size to the right, smaler to the left)

thx in advance

 

This should work. Set the track bar's minimum value to 1 and maximum value to 72.

Code:

public Form1()
{
    InitializeComponent();

    richTextBox1.SelectionChanged += new EventHandler(richTextBox1_SelectionChanged);
    trackBar1.ValueChanged += new EventHandler(trackBar1_ValueChanged);
}

bool sync = true;

void trackBar1_ValueChanged(object sender, EventArgs e)
{
    if (sync)
    {
        Font current = richTextBox1.SelectionFont;
        richTextBox1.SelectionFont =
            new Font(current.FontFamily, trackBar1.Value, current.Style, current.Unit, current.GdiCharSet, current.GdiVerticalFont);
    }
}

void richTextBox1_SelectionChanged(object sender, EventArgs e)
{
    if (sync)
    {
        sync = false;
        this.trackBar1.Value = (int)Math.Floor(richTextBox1.SelectionFont.SizeInPoints);
        sync = true;
    }
}

 

Ok thx I will take a closer look and try it tomorrow... gonna sleep now. thx

Tyvm! It works great!

EDIT:

hmm... sometimes I get this error, even tho I don't even use the trackbar... just when I'm changeing like font or color or what ever... :/
anyway.. this is the error i get: