Howto scroll flowlayoutpanel with button click event (up & down)

Question

0.00/5 (No votes)

See more:

Dear people

I'm trying to scroll my FlowLayoutPanel UP or DOWN using click event button at run time but for some reason its not working. Here is the code.

C#

private void cmdButtonsUp_Click(object sender, EventArgs e)
        {
            int curItem = this.flowLayoutStockInButtonsPanel.VerticalScroll.Value;
            if (curItem > 0)
            {
                this.flowLayoutStockInButtonsPanel.VerticalScroll.Value = this.flowLayoutStockInButtonsPanel.VerticalScroll.LargeChange - 1;
            }
        }
        private void cmdButtonsDown_Click(object sender, EventArgs e)
        {
            int curItem = this.flowLayoutStockInButtonsPanel.VerticalScroll.Value;
            if (curItem < 0)
            {
                this.flowLayoutStockInButtonsPanel.VerticalScroll.Value = this.flowLayoutStockInButtonsPanel.VerticalScroll.LargeChange + 1;
            }
        }

Could someone please help me maybe I'm missing something on my code...

Thanks in advance

Lapeci

Posted 26-Dec-10 14:46pm

LAPEC

Add a Solution

2 solutions

Solution 2

In both cases curItem would be <= And >=

Posted 23-Apr-15 7:42am

Member 10748738

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)

Sergey Alexandrovich Kryukov · Accepted Answer · 2010-12-26T18:11:00

Solution 1

How your control knows that VerticalScroll properties are modified?
You need to trigger the layout update.

When the scrolling position is changed, add:

C#

flowLayoutStockInButtonsPanel.PerformLayout();

Thoroughly check up logics, calculation and constraints. In particular, use VerticalScroll.Minimum (you’re using 0, this is incorrect), VerticalScroll.Maximum, VerticalScroll.SmallChange.

Posted 26-Dec-10 18:11pm

Sergey Alexandrovich Kryukov

Updated 26-Dec-10 18:14pm

v3

Comments

Espen Harlinn 28-Feb-11 15:09pm

Nice and simple solution, my 5

Sergey Alexandrovich Kryukov 1-Mar-11 3:33am

Thank you, Espen, that's all that involved.
--SA

victowork 11-Nov-14 2:20am

Dear SAKryukov Please Help me
in which event I have to add flowLayoutStockInButtonsPanel.PerformLayout();
I always get 0 for this.flowLayoutStockInButtonsPanel.VerticalScroll.Value.

Please Help Its Very Urgent

Sergey Alexandrovich Kryukov 11-Nov-14 2:31am

You already assigned scroll value to a scroll. After you do it, the missing piece is the call to PerformLayout.
—SA

victowork 11-Nov-14 3:09am

how can i assign Scroll values my flowlayout panel consist of Usercontrols, Which will add dynamiccaly i have to buttons top and down. My code is just like this
private void BtnProdUp_Click(object sender, EventArgs e)
{
FlowProducts.PerformLayout();
int curItem = this.FlowProducts.VerticalScroll.Value;
if (curItem > 0)
{
this.FlowProducts.VerticalScroll.Value = this.FlowProducts.VerticalScroll.LargeChange - 1;
}
}

private void btnProdDown_Click(object sender, EventArgs e)
{
FlowProducts.PerformLayout();
int curItem = this.FlowProducts.VerticalScroll.Value;
if (curItem > 0)
{
this.FlowProducts.VerticalScroll.Value = this.FlowProducts.VerticalScroll.LargeChange + 1;
}
}

Sergey Alexandrovich Kryukov 11-Nov-14 9:56am

Try just the opposite: assign first, them PerformLayout.
—SA

Flote Fuertes 11-Nov-14 23:24pm

Hi I tried your solution above but it will stuck after i click the button more than twice. could you please post the correct revised solutions?. I think I am lost. Thanks

Sergey Alexandrovich Kryukov 11-Nov-14 23:33pm

I don't see why. Could you explain in detail what happened with what code? How a second click makes something wrong? To test it, I would need time...
Besides, I don't remember the detail of original problem (sorry, but some 2 weeks passed since your original post). As I remember, when you changed the scroll position, the layout (or something) messed up, that's why I advised to PerformLayout. At this moment, I cannot see your explanation in the wrong behavior...
—SA