C# winform自定义Label控件使其能设置行距
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Drawing;
- using System.ComponentModel;
- namespace WindowsFormsApplication10
- {
- public partial class LabelTx : System.Windows.Forms.Label
- {
- int lineDistance = 5;//行间距
- Graphics gcs;
- int iHeight = 0, height = 200;
- string[] nrLine;
- string[] nrLinePos;
- int searchPos = 0;
- int section = 1;
- public int LineDistance
- {
- get { return lineDistance; }
- set
- {
- lineDistance = value;
- Changed(this.Font, this.Width, this.Text);
- }
- }
- public LabelTx()
- : base()
- {
- //this.TextChanged += new EventHandler(LabelTx_TextChanged);
- this.SizeChanged += new EventHandler(LabelTx_SizeChanged);
- this.FontChanged += new EventHandler(LabelTx_FontChanged);
- //this.Font = new Font(this.Font.FontFamily, this.Font.Size, GraphicsUnit.Pixel);
- }
- void LabelTx_FontChanged(object sender, EventArgs e)
- {
- Changed(this.Font, this.Width, this.Text);
- }
- void LabelTx_SizeChanged(object sender, EventArgs e)
- {
- Changed(this.Font, this.Width, this.Text);
- }
- public LabelTx(IContainer container)
- {
- container.Add(this);
- //base.Height
- //InitializeComponent();
- }
- public int FHeight
- {
- get { return this.Font.Height; }
- }
- protected int Height
- {
- get { return height; }
- set
- {
- height = value;
- base.Height = value;
- }
- }
- public override string Text
- {
- get
- {
- return base.Text;
- }
- set
- {
- //is.Font.Size.
- base.Text = value;
- Changed(this.Font, this.Width, value);
- }
- }
- protected void Changed(Font ft, int iWidth, string value)
- {
- iHeight = 0;
- if (value != "")
- {
- if (gcs == null)
- {
- gcs = this.CreateGraphics();
- SizeF sf0 = gcs.MeasureString(new string('测', 20), ft);
- searchPos = (int)(iWidth * 20 / sf0.Width);
- }
- nrLine = value.Split(new string[1] { "/r/n" }, StringSplitOptions.RemoveEmptyEntries);
- section = nrLine.Length;
- nrLinePos = new string[section];
- SizeF sf1, sf2;
- string temps, tempt;
- string drawstring;
- int temPos, ipos;
- for (int i = 0; i < section; i++)
- {
- ipos = 0;
- temPos = searchPos;
- if (searchPos >= nrLine[i].Length)
- {
- ipos += nrLine[i].Length;
- nrLinePos[i] += "," + ipos.ToString();
- iHeight++;
- continue;
- }
- drawstring = nrLine[i];
- nrLinePos[i] = "";
- while (drawstring.Length > searchPos)
- {
- bool isfind = false;
- for (int j = searchPos; j < drawstring.Length; j++)
- {
- temps = drawstring.Substring(0, j);
- tempt = drawstring.Substring(0, j + 1);
- sf1 = gcs.MeasureString(temps, ft);
- sf2 = gcs.MeasureString(tempt, ft);
- if (sf1.Width < iWidth && sf2.Width > iWidth)
- {
- iHeight++;
- ipos += j;
- nrLinePos[i] += "," + ipos.ToString();
- isfind = true;
- drawstring = drawstring.Substring(j);
- break;
- }
- }
- if (!isfind)
- {
- //drawstring = drawstring.Substring(searchPos);
- //iHeight++;
- break;
- }
- }
- ipos += drawstring.Length;
- nrLinePos[i] += "," + ipos.ToString();
- iHeight++;
- //tempLine = (int)(sf1.Width - 1) / this.Width + 1;
- //iHeight += tempLine;
- }
- }
- this.Height = iHeight * (ft.Height + lineDistance);
- }
- protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
- {
- //base.OnPaint(e);
- //if (isPaint) return;
- //isPaint = true;
- Graphics g = e.Graphics;
- String drawString = this.Text;
- Font drawFont = this.Font;
- SolidBrush drawBrush = new SolidBrush(this.ForeColor);
- SizeF textSize = g.MeasureString(this.Text, this.Font);//文本的矩形区域大小
- int lineCount = Convert.ToInt16(textSize.Width / this.Width) + 1;//计算行数
- int fHeight = this.Font.Height;
- int htHeight = 0;
- this.AutoSize = false;
- float x = 0.0F;
- float y = 0.0F;
- StringFormat drawFormat = new StringFormat();
- int step = 1;
- bool isFirst = true;
- SizeF sf1, sf2;
- string subN, subN1;
- lineCount = drawString.Length;//行数不超过总字符数目
- int i, idx, first;
- string subStr, tmpStr = "", midStr = "";
- string[] idxs;
- for (i = 0; i < section; i++)
- {
- first = 0;
- subStr = nrLine[i];
- if (nrLinePos[i] != null) tmpStr = nrLinePos[i].TrimStart(',');
- midStr = subStr.Substring(first);
- if (tmpStr != "")
- {
- idxs = tmpStr.Split(',');
- for (int j = 0; j < idxs.Length; j++)
- {
- idx = int.Parse(idxs[j]);
- midStr = subStr.Substring(first, idx - first);
- e.Graphics.DrawString(midStr, drawFont, drawBrush, x, Convert.ToInt16(htHeight), drawFormat);
- htHeight += (fHeight + lineDistance);
- first = idx;
- }
- //midStr = subStr.Substring(first);
- }
- //e.Graphics.DrawString(midStr, drawFont, drawBrush, x, Convert.ToInt16(htHeight), drawFormat);
- //htHeight += ( lineDistance);//fHeight +
- }
- }
- }
- }
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