Firing event when scroll bar reaches the bottom of panel

Question

0.00/5 (No votes)

See more:

I have a winform application where I want a event to be fired when the scrollbar reaches the bottom of panel.

I tried this:

C#

private void Panel1_Scroll(object sender, ScrollEventArgs e)
{
    //some operation
}

But it is firing event everytime I scroll the Scrollbar.

How to achieve this ?

Posted 14-Dec-15 23:31pm

Digambar Malla

Add a Solution

Comments

Stephen Hewison 15-Dec-15 5:57am

There is no scroll at bottom event so you've have to use the event you've identified. Then test the scroll position to see if it's at the bottom.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

BillWoodruff · Accepted Answer · 2015-12-15T00:23:00

For whatever reasons Microsoft made detecting scrolling to bottom, and to right, in Windows Forms, much more tricky than was necessary.

The Panel has serious flaws in its scrolling behavior: the ScrollEventArgs.Type field which should hold an enumeration value of Type ScrollEventArgs is (according to Kornfeld Peter's recent source code examination) not really implemented.

C#

private void panel1_Scroll(object sender, ScrollEventArgs e)
{
    VScrollProperties vsp = panel1.VerticalScroll;

    int scrollmax = vsp.Maximum - vsp.LargeChange + 1;

    if (e.NewValue == scrollmax) scrolledToBottom(e.NewValue, scrollmax);
}

// test
private void scrolledToBottom(int nv, int smax)
{
    Console.WriteLine("scrolled to bottom: {0} {1}", nv, smax);
}

Note:

You could create variables at Form level, to hold the values of the Panel's VerticalScroll.Maximum and VerticalScroll.LargeChange, then initialize them in the Form Load Event, or the constructor of the Form if you don't manipulate those properties in your code ... or, if you do manipulate them, you'll need to update the variables.