using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace WindowsFormsApp1.utils.ui
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{
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class TextBoxUtil
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{
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public const int WM_USER = 0x0400;
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public const int EM_GETPARAFORMAT = WM_USER + 61;
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public const int EM_SETPARAFORMAT = WM_USER + 71;
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public const long MAX_TAB_STOPS = 32;
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public const uint PFM_LINESPACING = 0x00000100;
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//定义结构体，为什么这么定义，我也不知道
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[StructLayout(LayoutKind.Sequential)]
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private struct PARAFORMAT2
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{
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public int cbSize;
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public uint dwMask;
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public short wNumbering;
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public short wReserved;
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public int dxStartIndent;
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public int dxRightIndent;
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public int dxOffset;
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public short wAlignment;
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public short cTabCount;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
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public int[] rgxTabs;
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public int dySpaceBefore;
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public int dySpaceAfter;
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public int dyLineSpacing;
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public short sStyle;
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public byte bLineSpacingRule;
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public byte bOutlineLevel;
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public short wShadingWeight;
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public short wShadingStyle;
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public short wNumberingStart;
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public short wNumberingStyle;
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public short wNumberingTab;
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public short wBorderSpace;
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public short wBorderWidth;
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public short wBorders;
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}
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//定义函数
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[DllImport("user32", CharSet = CharSet.Auto)]
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private static extern IntPtr SendMessage(HandleRef hWnd, int msg, int wParam, ref PARAFORMAT2 IParam);
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//调用方法如下
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public static void SetLineSpace(RichTextBox richTextBox, int lineSpace)
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{
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PARAFORMAT2 pFormat = new PARAFORMAT2();
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pFormat.cbSize = Marshal.SizeOf(pFormat);
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pFormat.bLineSpacingRule = 4;
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pFormat.dyLineSpacing = lineSpace;
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pFormat.dwMask = PFM_LINESPACING;
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SendMessage(new HandleRef(richTextBox, richTextBox.Handle),
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EM_SETPARAFORMAT, 4, ref pFormat);
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}
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}
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}
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