TextBox 同步滚动实现行号代码,CSharp代码库,德仔网

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【CSharp】 TextBox 同步滚动实现行号
作者:zzylscy/ / 发布于2013/10/24/ 638

	public Example()
	{
	 InitializeComponent();
	 this.txtContent.MouseWheel += new MouseEventHandler(txtContect_MouseWheel);
	}

	private int pageLine = 0; //当前文本框内容所能显示的行数
	private bool isLeftDown = false; //鼠标左键是否点下

	private void txtContect_TextChanged(object sender, EventArgs e)
	{
	 //调用顺序不可变
	 SetScrollBar();
	 ShowRow();
	 ShowCursorLine();
	}

	//鼠标滚动
	void txtContect_MouseWheel(object sender, MouseEventArgs e)
	{
	 timer1.Enabled = true;
	}

	// 上、下键
	private void txtContent_KeyDown(object sender, KeyEventArgs e)
	{
	 if (e.KeyData == System.Windows.Forms.Keys.Up || e.KeyData == System.Windows.Forms.Keys.Down)
	 SetScrollBar();
	
	}
	private void txtContent_KeyUp(object sender, KeyEventArgs e)
	{
	 if (e.KeyData == System.Windows.Forms.Keys.Up || e.KeyData == System.Windows.Forms.Keys.Down)
	 ShowCursorLine();
	}

	//点击滚动条
	private void vScrollBar1_ValueChanged(object sender, EventArgs e)
	{
	 int t = SetScrollPos(this.txtContent.Handle, 1, vScrollBar1.Value, true);
	 SendMessage(this.txtContent.Handle, WM_VSCROLL, SB_THUMBPOSITION + 0x10000 * vScrollBar1.Value, 0);
	 ShowRow();
	}

	//显示光标行
	private void txtContent_MouseDown(object sender, MouseEventArgs e)
	{
	 if (e.Button == System.Windows.Forms.MouseButtons.Left) isLeftDown = true;
	 ShowCursorLine();
	}

	//鼠标选择内容上下移动
	private void txtContent_MouseMove(object sender, MouseEventArgs e)
	{
	 SetScrollBar();
	}
	private void txtContent_MouseUp(object sender, MouseEventArgs e)
	{
	 isLeftDown = false;
	}

	//文本框大小改变
	private void txtContent_SizeChanged(object sender, EventArgs e)
	{
	 SCROLLINFO si = new SCROLLINFO();
	 si.cbSize = (uint)Marshal.SizeOf(si);
	 si.fMask = SIF_ALL;
	 int r = GetScrollInfo(this.txtContent.Handle, SB_VERT, ref si);
	 pageLine = (int)si.nPage;
	 timer1.Enabled = true;
	 ShowRow();
	}

	//行显示栏宽度自适应
	private void txtRow_TextChanged(object sender, EventArgs e)
	{
	 if (this.txtRow.Lines.Length > 0)
	 {
	 System.Drawing.SizeF s = this.txtRow.CreateGraphics().MeasureString(this.txtRow.Lines[this.txtRow.Lines.Length - 1], this.txtRow.Font);
	 this.txtRow.Width = (int)s.Width;
	 }
	}

	private void txtRow_SizeChanged(object sender, EventArgs e)
	{
	 this.txtContent.Location = new Point(this.txtRow.Width, this.txtContent.Location.Y);
	 this.txtContent.Width = this.ClientSize.Width - this.txtRow.Width;
	}
	//
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