How to set padding between text and border in RichTextBox Control using asp.net

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I am developing a windows application in c#.net

I have a richtextbox in which I display rtf files;

But it displays near border of rich textbox

I cannot give padding between text and border

So please help me

Posted 12-Dec-13 23:58pm

Dharmesh Parekh

Updated 28-Sep-20 4:54am

v3

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3 solutions

Solution 3

El problema es si tenes barra de desplazamiento, como solucinaria eso?

Posted 25-Mar-19 8:17am

Member 12003599

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Kats2512 26-Mar-19 2:59am

Por favor habla en ingles

Richard Deeming 26-Mar-19 15:58pm

No publique su pregunta como una solución a la pregunta de otra persona.

ASK A QUESTION[^]. In English. With a lot more detail than you have posted here.

Solution 4

Here is a simple solution for setting the left and right margins of a RichTextBox that worked well for me in a C# Windows app. It sets both the right and left margins to 4 pixels.

C#

[DllImport("user32.dll")]
static extern int SendMessage(IntPtr hWnd, uint wMsg, UIntPtr wParam, IntPtr lParam);

// both left and right margins set to 4 pixels with the last parm: 0x00040004
SendMessage(richtextbox1.Handle, 0xd3, (UIntPtr)0x3, (IntPtr)0x00040004);

I tried to make the SendMessage more proper below:

C#

const int EM_SETMARGINS = 0xd3;
const int EC_LEFTMARGIN = 0x1;
const int EC_RIGHTMARGIN = 0x2;

SendMessage(richtextbox1.Handle, EM_SETMARGINS,
 (UIntPtr)(EC_LEFTMARGIN | EC_RIGHTMARGIN), (IntPtr)0x00040004);

I figure this solution was not possible when the question was originally posted.

Posted 28-Sep-20 4:54am

tedr108

Updated 28-Sep-20 4:58am

v2

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BillWoodruff · Accepted Answer · 2013-12-13T01:24:00

You have stumbled upon the surprising limitations of the MS supplied RichTextBox (RTB) Control: even though the RTF standard supports embedded margin codes, you have no way to easily set them. You'll have to hack the RTB one way or another to effectively set variable document margins. And, as you found out, Padding is not implemented for the RTB.

However, there are two available Properties of the RTB that do have the effect of (kind of) giving you margins:

1. RightMargin (integer) property determines the line length. It's set in pixels. If your RTB is 500 pixels wide, and you set RightMargin to 480, you should get a 20 pixel wide right margin.

2. The ShowSelectionMargin (boolean) property if set to 'true will expose a small left margin in the RTB. Clicking in this area will select the entire line. You have no control over how wide this margin is.

A frequent Win Forms ui hack to simulate RTB margins is:

1. embed the RTB Control in a Panel, or other ContainerControl. set the RTB DockStyle to 'DockStyle.Fill

2. set the Padding parameters of the Panel to simulate margins.

3. set the BackColor of both Panel and RTB to the same color.

4. set the BorderStyle of the RTB to 'None.