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I'm a newbie, and recently I've asked this question, where it taught me to have my best option for TextBox's bottom border, that prevents flickering/tearing - resulted by drawn graphics.

Now my problem is how to have margin/paddings for the text/string inside the textbox, here's the code:

using System.Drawing; using System.Windows.Forms; namespace main.Classes.CustomControls { class TextBoxMaterial : TextBox { public TextBoxMaterial() { this.BorderStyle = System.Windows.Forms.BorderStyle.None; this.Controls.Add(new Label() { Height = 2, Dock = DockStyle.Bottom, BackColor = Color.Gray, }); } } }

Currently textbox:

enter image description here

What I need to have:

enter image description here

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2 Answers 2

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You can set left padding and right padding for text of TextBox by sending an EM_SETMARGINS. You also can set AutoSize property of the TextBox to false to be able to change the height of control. Here is the result:

enter image description here

using System; using System.Runtime.InteropServices; using System.Windows.Forms; using System.Drawing; public class ExTextBox : TextBox { [DllImport("user32.dll")] private static extern IntPtr SendMessage(IntPtr hwnd, int msg, int wParam, int lParam); private const int EM_SETMARGINS = 0xd3; private const int EC_RIGHTMARGIN = 2; private const int EC_LEFTMARGIN = 1; private int p = 10; public ExTextBox() : base() { var b = new Label { Dock = DockStyle.Bottom, Height = 2, BackColor = Color.Gray }; var l = new Label { Dock = DockStyle.Left, Width = p, BackColor = Color.White }; var r = new Label { Dock = DockStyle.Right, Width = p, BackColor = Color.White }; AutoSize = false; Padding = new Padding(0); BorderStyle = System.Windows.Forms.BorderStyle.None; Controls.AddRange(new Control[] { l, r, b }); } protected override void OnHandleCreated(EventArgs e) { base.OnHandleCreated(e); SetMargin(); } private void SetMargin() { SendMessage(Handle, EM_SETMARGINS, EC_RIGHTMARGIN, p << 16); SendMessage(Handle, EM_SETMARGINS, EC_LEFTMARGIN, p); } }

To know what the role of right label is, try not adding it to the control, then write a long text to TextBox and go to the end of text by arrow keys and again back to the beginning using arrow keys.

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3 Comments

I was about to ask a new question, but it will be a duplicate if I do, because this has been already answered here in this question [stackoverflow.com/questions/4902565/… I like your answer there, but using it in my code with this answer for text padding gives me: i.imgur.com/bFToAiR.png .. If it's allowed to ask a new question for this I would, but it could be marked as duplicate, please help! Thank you.
You can change the rectangle which you want to draw text in. var rect = this.ClientRectangle; rect.Inflate(-p,0); It creates a rectangle width deflating it's width. For example (0,0,100,20) will change to 10,0,80,20 . Then use it for drawing string: TextRenderer.DrawText(g, this.Hint, this.Font, rect, SystemColors.GrayText, this.BackColor, TextFormatFlags.Top | TextFormatFlags.Left | TextFormatFlags.NoPadding); Let me know if you have any problem applying the codes :)
To know what the role of right label is, try to not adding it to the control, then write a long text to TextBox and go to the end of text by arrow keys and again back to the beginning using arrow keys.
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I think you will have to inherit from UserControl rather than from TextBox and add a TextBox to your UserControl. Code below is by no means complete but should show you what I'm talking about

public partial class TextBoxMaterial : UserControl { public TextBoxMaterial() { InitializeComponent(); this.Controls.Add(new Label() { Height = 2, Dock = DockStyle.Bottom, BackColor = Color.Gray, }); this.Controls.Add(new TextBox() { Left = 10, Width = this.Width - 20, BackColor = this.BackColor, BorderStyle = BorderStyle.None, }); } }
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3 Comments

Considering this to be of my last resort, was thinking about the same thing, but still hoping I could just have a TextBox with text padding. On my previous question, a user commented this stackoverflow.com/questions/37947251/… , telling me it's possible to create padding on text.
Didn't take a close look but I know padding text and alike in Winforms is always problematic as users do weird stuff that is hard to second guess.
@Yawz Yes, it's possible. I posted an answer for you :)

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