文本和边框之间的富文本框填充

Question

是否可以在文本和边框之间的Rich Text Box控件中添加填充？

我尝试将一个富文本框对接到一个面板内,其四边的填充设置为10,并完成了我想要的.除非需要填充富文本框的垂直滚动条,否则也会填充.

Answer 1

RichTextBox没有填充属性.

通过将RichTextBox放在Panel中可以实现快速和脏的填充,该Panel具有与BackColorRichTextBox 相同的属性(通常Color.White).

然后,将DockRichTextBox 的属性设置为Fill,并使用PaddingPanel控件的属性进行播放.

Answer 2

有EM_GETRECT和EM_SETRECT.

将这两者结合在一起,你可以做到这一点:

......看起来像这样:

我写了一个小的C#扩展类来包装这一切.

用法示例:

const int dist = 24;
richTextBox1.SetInnerMargins(dist, dist, dist, 0);

这将左边,上边和右边的内边距设置为24,底部为零.

请注意,滚动时,上边距保持不变,如下所示:

就个人而言,这对我来说看起来"不自然".我倾向于在滚动上边距时也变为零.

也许有一个解决方法......

完整的源代码

截至要求:

public static class RichTextBoxExtensions
{
    public static void SetInnerMargins(this TextBoxBase textBox, int left, int top, int right, int bottom)
    {
        var rect = textBox.GetFormattingRect();

        var newRect = new Rectangle(left, top, rect.Width - left - right, rect.Height - top - bottom);
        textBox.SetFormattingRect(newRect);
    }

    [StructLayout(LayoutKind.Sequential)]
    private struct RECT
    {
        public readonly int Left;
        public readonly int Top;
        public readonly int Right;
        public readonly int Bottom;

        private RECT(int left, int top, int right, int bottom)
        {
            Left = left;
            Top = top;
            Right = right;
            Bottom = bottom;
        }

        public RECT(Rectangle r) : this(r.Left, r.Top, r.Right, r.Bottom)
        {
        }
    }

    [DllImport(@"User32.dll", EntryPoint = @"SendMessage", CharSet = CharSet.Auto)]
    private static extern int SendMessageRefRect(IntPtr hWnd, uint msg, int wParam, ref RECT rect);

    [DllImport(@"user32.dll", EntryPoint = @"SendMessage", CharSet = CharSet.Auto)]
    private static extern int SendMessage(IntPtr hwnd, int wMsg, IntPtr wParam, ref Rectangle lParam);

    private const int EmGetrect = 0xB2;
    private const int EmSetrect = 0xB3;

    private static void SetFormattingRect(this TextBoxBase textbox, Rectangle rect)
    {
        var rc = new RECT(rect);
        SendMessageRefRect(textbox.Handle, EmSetrect, 0, ref rc);
    }

    private static Rectangle GetFormattingRect(this TextBoxBase textbox)
    {
        var rect = new Rectangle();
        SendMessage(textbox.Handle, EmGetrect, (IntPtr) 0, ref rect);
        return rect;
    }
}

Answer 3

我有同样的问题,所描述的答案对我没有帮助,这对我有用,所以如果有帮助我会分享它.

richTextBox1.SelectAll();
richTextBox1.SelectionIndent += 15;//play with this values to match yours
richTextBox1.SelectionRightIndent += 15;//this too
richTextBox1.SelectionLength = 0;
//this is a little hack because without this
//i've got the first line of my richTB selected anyway.
richTextBox1.SelectionBackColor = richTextBox1.BackColor;

Answer 4

一种快速简便的方法是通过在表单加载和表单/控件调整大小事件中调用此示例方法来从垂直滚动中偏移文本:

private void AdjustTextBoxRMargin()
{
    richTextBox1.RightMargin = richTextBox1.Size.Width - 35;
}

35的值似乎适用于Win7,但在其他版本的Windows上可能有所不同.