根据内容大小 RichTextBox

问题描述

此代码根据内容自动调整 RichTextBox 的大小.我遇到了问题，尤其是表格.\t 可能会被忽略.我尝试了托管解决方案，现在我正在尝试平台调用.当前输出:

This code automatically sizes a RichTextBox according to it's contents. I'm having issues, especially with tables. \t may be ignored. I tried a managed solution, now I'm trying platform invoke. Current Output:

    [DllImport("gdi32.dll")]
    static extern bool GetTextExtentPoint32(IntPtr hdc, string lpString, int cbString, out SIZE lpSize);

    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr GetDC(IntPtr hWnd);

    [StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
    public struct SIZE
    {
        public int cx;
        public int cy;

        public SIZE(int cx, int cy)
        {
            this.cx = cx;
            this.cy = cy;
        }
    }

    public static void Main()
    {
        Form form = new Form();
        RichTextBox rtfBox = new RichTextBox();

        rtfBox.Rtf = @"{\rtf1\ansi\deff0{\fonttbl{\f0\fnil Arial;}}\viewkind4\uc1\trowd\trgaph100\cellx1000\cellx2000\pard\intbl\lang1033\f0\fs20  hi\cell  bye\cell\row\intbl  one\cell  two\cell\row\pard\par}";
        rtfBox.ScrollBars = RichTextBoxScrollBars.None;

        string sInput = "hi\t bye\t\n";// one\t two\t\n";
        SIZE CharSize;

        form.Controls.Add(rtfBox);

        IntPtr hdc = GetDC(IntPtr.Zero);//Context for entire screen
        GetTextExtentPoint32(hdc, sInput, sInput.Length, out CharSize);

        rtfBox.Width = CharSize.cx;
        rtfBox.Height = CharSize.cy;

        form.Visible = false;

        form.ShowDialog();
    }

(注意，为简单起见，这是一个引用 System.Windows.Forms.dll 的控制台应用程序)

(Note, for simplicity this is a console application with a reference to System.Windows.Forms.dll)

推荐答案

你看过 ContentsResized 事件?添加以下在事件触发时调用的方法:

Have you looked at the ContentsResized event? Add the following method to be called when the event fires:

private void richTextBox_ContentsResized(object sender, ContentsResizedEventArgs e)
{
    var richTextBox = (RichTextBox) sender;
    richTextBox.Width = e.NewRectangle.Width;
    richTextBox.Height = e.NewRectangle.Height;
}

当 RTF 内容更改时(使用 Rtf)，RichTextBox 应该调整大小以匹配其内容.确保您还设置了 WordWrap属性为 false.

When the RTF content is changed (using Rtf), the RichTextBox should be resized to match its contents. Make sure you also set the WordWrap property to false.

我已经用您的表格示例进行了尝试，它似乎确实有效(尽管有一点偏移，您可以通过向调整后的大小添加几个像素宽度来解决这个问题 - 不知道为什么会发生这种情况):

I've tried it with your table example and it does appear to work (albeit with a little offset, which you could possibly solve by adding a few pixels of width to the adjusted size - not sure why that happens):

P.Brian.Mackey 编辑
这个答案对我有用.澄清一下，这是包括边框修复的最终代码:

P.Brian.Mackey EDIT
This answer worked for me. To clarify, here's the final code including border fix:

    public static void Main()
    {
        string sInput = "hi\t bye\t\n";// one\t two\t\n";
        SIZE CharSize;
        Form form = new Form();
        RichTextBox rtfBox = new RichTextBox();
        rtfBox.ContentsResized += (object sender, ContentsResizedEventArgs e) =>
        {
            var richTextBox = (RichTextBox)sender;
            richTextBox.Width = e.NewRectangle.Width;
            richTextBox.Height = e.NewRectangle.Height;
            rtfBox.Width += rtfBox.Margin.Horizontal + SystemInformation.HorizontalResizeBorderThickness;
        };

        rtfBox.WordWrap = false;
        rtfBox.ScrollBars = RichTextBoxScrollBars.None;

        rtfBox.Rtf = @"{\rtf1\ansi\deff0{\fonttbl{\f0\fnil Arial;}}\viewkind4\uc1\trowd\trgaph100\cellx1000\cellx2000\pard\intbl\lang1033\f0\fs20  hi\cell  bye\cell\row\intbl  one\cell  two\cell\row\pard\par}";

        form.Controls.Add(rtfBox);
        form.ShowDialog();
    }

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