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Scrolling Text

, 31 Aug 2012
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A function to generate an endless collection of scrolling text for your use/amusement.

For situations where you might have a need for text that can scroll, just a little simple toy method that'll allow you to efficiently generate the strings for such.

 public IEnumerable<string> ScrollableText(string text, int charactersToDisplay)
{
    if (string.IsNullOrWhiteSpace(text))
        throw new ArgumentException("Text cannot be null, empty, or whitespace.", "text");
    if (charactersToDisplay < 1)
        throw new ArgumentException("You must specify at least one character to display.", "charactersToDisplay");

    string[] states;
    
    if (text.Length <= charactersToDisplay)
    {
        states = new string[] { text };
    }
    else
    {
        states = new string[text.Length];

        string sourceString = string.Concat(text, text);
    
        // Build the different states of the scrolling text.
        for (int i = 0; i < text.Length; ++i)
            states[i] = sourceString.Substring(i, charactersToDisplay);
    }

    int index = 0;
    
    // Cycle through the different states of the scrolling text, ad nauseum.
    while (true)
    {
        yield return states[index];
        
        if (++index >= states.Length)
            index = 0;
    }
}

License

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

About the Author

Andrew Rissing
Software Developer (Senior)
United States United States
Since I've begun my profession as a software developer, I've learned one important fact - change is inevitable. Requirements change, code changes, and life changes.
 
So..If you're not moving forward, you're moving backwards.

Comments and Discussions

 
GeneralMy vote of 4 PinmemberChristian Amado2-Sep-12 5:07 

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