Marquee rtf content from botttom to top in winforms

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I want to implement scrolling text(marquee) functionality in winforms for rtf in c#. I need text to scroll from bottom to top. and loop back..
I have done this using scrollbar..but dont know how to repeat or loop

Please give some suggestions..

Posted 30-Jan-14 20:40pm

srini45

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BillWoodruff 31-Jan-14 6:38am

Are you asking how you can make a RichTextBox Control move up and down in a Form ?

1 solution

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lukeer · Answer 1 · 2014-01-30T22:34:00

Solution 1

Call the following in a timer. Set startTime to the time you started the timer.

C#

private void TimerCalledMethod()
{
    TimeSpan runningSpan = DateTime.Now - startTime;
    float cycleFraction = runningSpan % timeSpanForOneCycle;    // Or convert both to milliseconds

    float scrollFraction;
    if (cycleFraction < 0.5F)
    {
        scrollFraction = 2F * cycleFraction;
    }
    else
    // cycleFraction must be between 0.5 and 1
    {
        scrollFraction = 2F - (2F * cycleFraction);
    }

    ScrollBar.SetPosition(rtfHeight * scrollFraction);
}

[Edit]That's untested pseudo-code just coincidentally looking much like C#.[/Edit]

Posted 30-Jan-14 22:34pm

lukeer

Updated 31-Jan-14 1:04am

v2

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srini45 31-Jan-14 4:53am

Thanks for the reply

private void TimerCalledMethod()
{
TimeSpan runningSpan = DateTime.Now - startTime;
float cycleFraction = runningSpan % timeSpanForOneCycle; // Or convert both to milliseconds

float scrollFraction;
if (cycleFraction < 0.5F)
{
scrollFraction = 2F * cycleFraction;
}
else
// cycleFraction must be between 0.5 and 1
{
scrollFraction = 2F - (2F * cycleFraction);
}

ScrollBar.SetPosition(rtfHeight * scrollFraction);
}

I am getting following error..
ScrollBar.SetPosition SetPosition doesnot exist in scrollbar..

What is the mistake..

Please help

lukeer 31-Jan-14 8:58am

MSDN[^] is your friend here. It states that the Value[^] property is used to set a ScrollBar's position.

And please don't post code in comments. It's much more readable when posted within the question enclosed in tags as such: <pre lang="cs">YourCodeHere();</pre>.
You can still change your question using the green Improve question[^] link just beneath your question.

srini45 31-Jan-14 5:28am

Here is the entire code..please help..

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

namespace ScrollVertically
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "RTF Files|*.rtf";
if (ofd.ShowDialog() == DialogResult.OK)
{
richTextBox1.LoadFile(ofd.FileName);
}
}

private void button2_Click(object sender, EventArgs e)
{
timer1.Enabled = true;

Stopwatch stopWatch = Stopwatch.StartNew();
stopWatch.Stop();
DateTime time = DateTime.Now;
TimeSpan runningSpan = DateTime.Now - time;

float cycleFraction = 1000 % 100; // Or convert both to milliseconds

float scrollFraction;
if (cycleFraction < 0.5F)
{
scrollFraction = 2F * cycleFraction;
}
else
// cycleFraction must be between 0.5 and 1
{
scrollFraction = 2F - (2F * cycleFraction);
}

ScrollBar.SetPosition(richTextBox1.Height * scrollFraction);
}
}
}