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C# winform自定义Label控件使其能设置行距

作者：代码星球 发布时间：2023-10-20 阅读：315
  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Linq;  
  4. using System.Text;  
  5. using System.Drawing;  
  6. using System.ComponentModel;  
  7. namespace WindowsFormsApplication10  
  8. {  
  9.     public partial class LabelTx : System.Windows.Forms.Label  
  10.     {  
  11.         int lineDistance = 5;//行间距      
  12.         Graphics gcs;  
  13.         int iHeight = 0, height = 200;  
  14.         string[] nrLine;  
  15.         string[] nrLinePos;  
  16.         int searchPos = 0;  
  17.         int section = 1;  
  18.         public int LineDistance  
  19.         {  
  20.             get { return lineDistance; }  
  21.             set  
  22.             {  
  23.                 lineDistance = value;  
  24.                 Changed(this.Font, this.Width, this.Text);  
  25.             }  
  26.         }  
  27.         public LabelTx()  
  28.             : base()  
  29.         {  
  30.             //this.TextChanged += new EventHandler(LabelTx_TextChanged);     
  31.             this.SizeChanged += new EventHandler(LabelTx_SizeChanged);  
  32.             this.FontChanged += new EventHandler(LabelTx_FontChanged);  
  33.             //this.Font = new Font(this.Font.FontFamily, this.Font.Size, GraphicsUnit.Pixel);    
  34.         }  
  35.         void LabelTx_FontChanged(object sender, EventArgs e)  
  36.         {  
  37.             Changed(this.Font, this.Width, this.Text);  
  38.         }  
  39.         void LabelTx_SizeChanged(object sender, EventArgs e)  
  40.         {  
  41.             Changed(this.Font, this.Width, this.Text);  
  42.         }  
  43.         public LabelTx(IContainer container)  
  44.         {  
  45.             container.Add(this);  
  46.             //base.Height     
  47.             //InitializeComponent();     
  48.         }  
  49.         public int FHeight  
  50.         {  
  51.             get { return this.Font.Height; }  
  52.         }  
  53.         protected int Height  
  54.         {  
  55.             get { return height; }  
  56.             set  
  57.             {  
  58.                 height = value;  
  59.                 base.Height = value;  
  60.             }  
  61.         }  
  62.         public override string Text  
  63.         {  
  64.             get  
  65.             {  
  66.                 return base.Text;  
  67.             }  
  68.             set  
  69.             {  
  70.                 //is.Font.Size.                         
  71.                 base.Text = value;  
  72.                 Changed(this.Font, this.Width, value);  
  73.             }  
  74.         }  
  75.         protected void Changed(Font ft, int iWidth, string value)  
  76.         {  
  77.             iHeight = 0;  
  78.             if (value != "")  
  79.             {  
  80.                 if (gcs == null)  
  81.                 {  
  82.                     gcs = this.CreateGraphics();  
  83.                     SizeF sf0 = gcs.MeasureString(new string('测', 20), ft);  
  84.                     searchPos = (int)(iWidth * 20 / sf0.Width);  
  85.                 }  
  86.                 nrLine = value.Split(new string[1] { "/r/n" }, StringSplitOptions.RemoveEmptyEntries);  
  87.                 section = nrLine.Length;  
  88.                 nrLinePos = new string[section];  
  89.                 SizeF sf1, sf2;  
  90.                 string temps, tempt;  
  91.                 string drawstring;  
  92.                 int temPos, ipos;  
  93.                 for (int i = 0; i < section; i++)  
  94.                 {  
  95.                     ipos = 0;  
  96.                     temPos = searchPos;  
  97.                     if (searchPos >= nrLine[i].Length)  
  98.                     {  
  99.                         ipos += nrLine[i].Length;  
  100.                         nrLinePos[i] += "," + ipos.ToString();  
  101.                         iHeight++;  
  102.                         continue;  
  103.                     }  
  104.                     drawstring = nrLine[i];  
  105.                     nrLinePos[i] = "";  
  106.                     while (drawstring.Length > searchPos)  
  107.                     {  
  108.                         bool isfind = false;  
  109.                         for (int j = searchPos; j < drawstring.Length; j++)  
  110.                         {  
  111.                             temps = drawstring.Substring(0, j);  
  112.                             tempt = drawstring.Substring(0, j + 1);  
  113.                             sf1 = gcs.MeasureString(temps, ft);  
  114.                             sf2 = gcs.MeasureString(tempt, ft);  
  115.                             if (sf1.Width < iWidth && sf2.Width > iWidth)  
  116.                             {  
  117.                                 iHeight++;  
  118.                                 ipos += j;  
  119.                                 nrLinePos[i] += "," + ipos.ToString();  
  120.                                 isfind = true;  
  121.                                 drawstring = drawstring.Substring(j);  
  122.                                 break;  
  123.                             }  
  124.                         }  
  125.                         if (!isfind)  
  126.                         {  
  127.                             //drawstring = drawstring.Substring(searchPos);     
  128.                             //iHeight++;     
  129.                             break;  
  130.                         }  
  131.                     }  
  132.                     ipos += drawstring.Length;  
  133.                     nrLinePos[i] += "," + ipos.ToString();  
  134.                     iHeight++;  
  135.                     //tempLine = (int)(sf1.Width - 1) / this.Width + 1;                            
  136.                     //iHeight += tempLine;     
  137.                 }  
  138.             }  
  139.             this.Height = iHeight * (ft.Height + lineDistance);  
  140.         }  
  141.         protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)  
  142.         {  
  143.             //base.OnPaint(e);                
  144.             //if (isPaint) return;     
  145.             //isPaint = true;     
  146.             Graphics g = e.Graphics;  
  147.             String drawString = this.Text;  
  148.             Font drawFont = this.Font;  
  149.             SolidBrush drawBrush = new SolidBrush(this.ForeColor);  
  150.             SizeF textSize = g.MeasureString(this.Text, this.Font);//文本的矩形区域大小       
  151.             int lineCount = Convert.ToInt16(textSize.Width / this.Width) + 1;//计算行数       
  152.             int fHeight = this.Font.Height;  
  153.             int htHeight = 0;  
  154.   
  155.             this.AutoSize = false;  
  156.             float x = 0.0F;  
  157.             float y = 0.0F;  
  158.             StringFormat drawFormat = new StringFormat();  
  159.             int step = 1;  
  160.             bool isFirst = true;  
  161.             SizeF sf1, sf2;  
  162.             string subN, subN1;  
  163.             lineCount = drawString.Length;//行数不超过总字符数目        
  164.             int i, idx, first;  
  165.             string subStr, tmpStr = "", midStr = "";  
  166.             string[] idxs;  
  167.             for (i = 0; i < section; i++)  
  168.             {  
  169.                 first = 0;  
  170.                 subStr = nrLine[i];  
  171.                 if (nrLinePos[i] != null) tmpStr = nrLinePos[i].TrimStart(',');  
  172.                 midStr = subStr.Substring(first);  
  173.                 if (tmpStr != "")  
  174.                 {  
  175.                     idxs = tmpStr.Split(',');  
  176.                     for (int j = 0; j < idxs.Length; j++)  
  177.                     {  
  178.                         idx = int.Parse(idxs[j]);  
  179.                         midStr = subStr.Substring(first, idx - first);  
  180.                         e.Graphics.DrawString(midStr, drawFont, drawBrush, x, Convert.ToInt16(htHeight), drawFormat);  
  181.                         htHeight += (fHeight + lineDistance);  
  182.                         first = idx;  
  183.                     }  
  184.                     //midStr = subStr.Substring(first);     
  185.                 }  
  186.                 //e.Graphics.DrawString(midStr, drawFont, drawBrush, x, Convert.ToInt16(htHeight), drawFormat);    
  187.                 //htHeight += ( lineDistance);//fHeight +     
  188.             }  
  189.         }  
  190.     }  
  191. }   

本文标签：winform 自定义 Label 控件 使其 设置 行距

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