Use Mouse Scroll in Picture Box in C#.net

Question

1.00/5 (1 vote)

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C#

Hi,
i want to Zoom In and Zoom Out when user mouse wheel in the C#.net. It is an Windows Application . Please Help me.

Posted 29-Nov-11 20:32pm

naraayanan

Updated 27-Feb-22 9:13am

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Comments

Sergey Alexandrovich Kryukov 30-Nov-11 2:55am

So, scroll or zoom? I guess both...
--SA

3 solutions

Solution 1

You can't, without hooking the MouseWheel messages.

You can add a handler for the event (by writing the code in your form load event handler - it is masked in the designer) but it will never occur. The reason? The PictureBox can never have the input focus, so can never obey mouse wheel commands. So, no event in the designer, no event when the app runs.
Try this: Add a panel, and give it a MouseWheel handler. Make it print to the console. Try it. Nothing happens.
Add a textbox to the panel. Try again. When the textbox has the focus, you get mouse wheel events.

Try and think of another way to do your zoom, it will be much easier!

Posted 29-Nov-11 21:12pm

OriginalGriff

Comments

Michel [mjbohn] 30-Nov-11 3:50am

I use MouseHover to get PictureBox focused. Please see my solution. What do you think about?

naraayanan 3-Dec-11 1:25am

Hi,
Thanks for your mail

Solution 3

I use TrackBar to capture wheel mouse event, like below:

1- Add a TrackBar control to the form.

2- Set Scroll event to the TrackBar.

private void TrackBar1_Scroll(object sender, EventArgs e)
        {
            try
            {
                ... do something with the TrackBar1.value.
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

Posted 27-Feb-22 9:13am

Member 10375470

Updated 27-Feb-22 9:15am

v2

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Michel [mjbohn] · Accepted Answer · 2011-11-29T21:33:00

Just as Griff said in his solution

Quote:
The PictureBox can never have the input focus[...]

But nosy as I am I tried this:

C#

pictureBox1.MouseWheel += new MouseEventHandler(pictureBox1_MouseWheel);
pictureBox1.MouseHover += new EventHandler(pictureBox1_MouseHover);

void pictureBox1_MouseHover(object sender, EventArgs e)
{
    pictureBox1.Focus();
}


void pictureBox1_MouseWheel(object sender, MouseEventArgs e)
{
    // here I can use e.Delta        
}

Did not check for pitfalls in using MouseHover to get focus. Just an idea...