如何在 Windows 窗体 TextBox 控件中设置 TAB 宽度?

How to set the TAB width in a Windows Forms TextBox control?(如何在 Windows 窗体 TextBox 控件中设置 TAB 宽度?)

问题描述

给定一个带有 MultiLine = true 和 AcceptsTab == true 的 WinForms TextBox 控件，如何设置显示的制表符的宽度?

Given a WinForms TextBox control with MultiLine = true and AcceptsTab == true, how can I set the width of the tab character displayed?

我想将其用作插件的快速而肮脏的脚本输入框.真的完全不需要花哨，但如果标签不显示为 8 个字符宽就好了……

I want to use this as a quick and dirty script input box for a plugin. It really doesn't need to be fancy at all, but it would be nice if tabs were not displayed as 8 characters wide...

推荐答案

我认为将 EM_SETTABSTOPS 消息发送到 TextBox 会起作用.

I think sending the EM_SETTABSTOPS message to the TextBox will work.

// set tab stops to a width of 4
private const int EM_SETTABSTOPS = 0x00CB;

[DllImport("User32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr h, int msg, int wParam, int[] lParam);

public static void SetTabWidth(TextBox textbox, int tabWidth)
{
    Graphics graphics = textbox.CreateGraphics();
    var characterWidth = (int)graphics.MeasureString("M", textbox.Font).Width;
    SendMessage
        ( textbox.Handle
        , EM_SETTABSTOPS
        , 1
        , new int[] { tabWidth * characterWidth }
        );
}

这可以在 Form 的构造函数中调用，但要注意:确保首先运行 InitializeComponents.

This can be called in the constructor of your Form, but beware: Make sure InitializeComponents is run first.

• 链接在 MSDN
• 这是另一个链接

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