winforms big paragraph tooltip

I'm trying to display a paragraph in a tooltip when I hover a certain picture box. The problem is, the tooltip takes that paragraph, and spans it on one line, a开发者_Go百科ll across my screen. How can I make it so that it takes a smaller, more readable area? or, maybe you have another technique to achieve the same thing, but without the tooltip function?

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Add line breaks to your string.

string tooltip = string.Format("Here is a lot of text that I want{0}to display on multiple{0}lines.", Environment.NewLine);

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You don't need to use code to include \r\n characters.

If you click on the dropdown arrow to the right of the ToolTip property value, it displays a multiline edit box.

Just press Enter to create a new line.

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Here's something you can use:

private const int maximumSingleLineTooltipLength = 20;

private static string AddNewLinesForTooltip(string text)
{
    if (text.Length < maximumSingleLineTooltipLength)
        return text;
    int lineLength = (int)Math.Sqrt((double)text.Length) * 2;
    StringBuilder sb = new StringBuilder();
    int currentLinePosition = 0;
    for (int textIndex = 0; textIndex < text.Length; textIndex++)
    {
        // If we have reached the target line length and the next 
        // character is whitespace then begin a new line.
        if (currentLinePosition >= lineLength && 
              char.IsWhiteSpace(text[textIndex]))
        {
            sb.Append(Environment.NewLine);
            currentLinePosition = 0;
        }
        // If we have just started a new line, skip all the whitespace.
        if (currentLinePosition == 0)
            while (textIndex < text.Length && char.IsWhiteSpace(text[textIndex]))
                textIndex++;
        // Append the next character.
        if (textIndex < text.Length)
            sb.Append(text[textIndex]);

        currentLinePosition++;
    }
    return sb.ToString();
}

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Have you tried inserting newlines \n into the tooltip, to get it to span multiple lines?

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You can't add the \r\n in the tooltip property of the control. It simply doesn't work. To resolve you issue, simply add the tooltip in the code itself typically in the InitializeComponent method. I.E.: (c#, winform example)

this.mToolTip.SetToolTip(this.tbxControl,
    "This is the first line of the tooltip.\r\n" +
    "This is the second line of the tooltip.");

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Using new line worked for me

System.Environment.NewLine

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If you enter a tool tip in the DataGridView properties control for columns, and I suspect other WinForms control designers, and include a "\r\n" in the tool tip, you will see "\\r\\n" in the tool tip that is displayed when you run the code. This is because the tool tip property is already a string, and the designer interprets the code from the tool tip entered in the properties window as "\\r\\n". You can go to the .Designer.cs file, manually edit the file, and replace "\\r\\n" with "\r\n". You will then see the tool tip with the line break when the application runs. If you go back and look at the value of the tool tip in the designer, you will see the tool tip without the line break, but it will be there, and will not be re-transformed to "\\r\\n" by the designer. Despite a comment made earlier, you only need the "\n". The "\r" is not necessary.