C# 重绘tabControl 添加关闭按钮（续）

在上一篇随笔中，添加关闭按钮是可以实现 ，但细心一点就会发现，每次关闭一个选项卡，tableControl都会自动跳到第一个页面，显然 这不是我们想要的，为此，我修改了部分的代码。除此之外，我还添加了一些两个新的方法，用于创建新的tablePage.以下是我实现 的类

#region 重绘tablecontrol的类(添加关闭页面功能),ablepage的创建，以及窗体的附加public class DrawTabControl{TabControl tabControl1 = null;Font font1 = null;//打开和关闭的页面索引int tabindex_show = 0;int tabindex_close = 0;public DrawTabControl() { }/// <summary>/// 初始化/// </summary>/// <param name="tabcontrol">TacControl控件</param>/// <param name="fo">主程序this.Font</param>public DrawTabControl(TabControl tabcontrol,Font fo){tabControl1 = tabcontrol;font1 = fo;}#region 关于tabcontrol的重绘const int CLOSE_SIZE = 15;//大小//tabPage标签图片Bitmap image = new Bitmap("D:\\power_003.png");public void ClearPage(){//清空控件//this.MainTabControl.TabPages.Clear();//绘制的方式OwnerDrawFixed表示由窗体绘制大小也一样this.tabControl1.DrawMode = TabDrawMode.OwnerDrawFixed;this.tabControl1.Padding = new System.Drawing.Point(CLOSE_SIZE, CLOSE_SIZE - 8);this.tabControl1.DrawItem += new DrawItemEventHandler(this.tabControl1_DrawItem);this.tabControl1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.tabControl1_MouseDown);}/// <summary>/// 产生新的窗体时触发/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void tabControl1_DrawItem(object sender, DrawItemEventArgs e){try{Rectangle myTabRect = this.tabControl1.GetTabRect(e.Index);//先添加TabPage属性 e.Graphics.DrawString(this.tabControl1.TabPages[e.Index].Text, this.font1, SystemBrushes.ControlText, myTabRect.X + 2, myTabRect.Y + 2);//再画一个矩形框using (Pen p = new Pen(Color.White)){myTabRect.Offset(myTabRect.Width - (CLOSE_SIZE + 3), 2);myTabRect.Width = CLOSE_SIZE;myTabRect.Height = CLOSE_SIZE;e.Graphics.DrawRectangle(p, myTabRect);}////填充矩形框Color recColor = e.State == DrawItemState.Selected ? Color.White : Color.White;using (Brush b = new SolidBrush(recColor)){e.Graphics.FillRectangle(b, myTabRect);}//画关闭符号using (Pen objpen = new Pen(Color.Black)){////=============================================//自己画X////"\"线Point p1 = new Point(myTabRect.X + 3, myTabRect.Y + 3);Point p2 = new Point(myTabRect.X + myTabRect.Width - 3, myTabRect.Y + myTabRect.Height - 3);e.Graphics.DrawLine(objpen, p1, p2);////"/"线Point p3 = new Point(myTabRect.X + 3, myTabRect.Y + myTabRect.Height - 3);Point p4 = new Point(myTabRect.X + myTabRect.Width - 3, myTabRect.Y + 3);e.Graphics.DrawLine(objpen, p3, p4);////=============================================//使用图片//Bitmap bt = new Bitmap(image);//Point p5 = new Point(myTabRect.X, 4);//e.Graphics.DrawImage(bt, p5);//e.Graphics.DrawString(this.MainTabControl.TabPages[e.Index].Text, this.font1, objpen.Brush, p5);}e.Graphics.Dispose();}catch (Exception){ }}/// <summary>/// 鼠标点击选项卡时的触发/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void tabControl1_MouseDown(object sender, MouseEventArgs e){if (e.Button == MouseButtons.Left){int x = e.X, y = e.Y;//计算关闭区域 Rectangle myTabRect = this.tabControl1.GetTabRect(this.tabControl1.SelectedIndex);myTabRect.Offset(myTabRect.Width - (CLOSE_SIZE + 3), 2);myTabRect.Width = CLOSE_SIZE;myTabRect.Height = CLOSE_SIZE;//如果鼠标在区域内就关闭选项卡,如果不在就显示选项卡//如果关闭的选项卡正好打开着，则关闭当前先项卡，显示下一个选项卡bool isClose = x > myTabRect.X && x < myTabRect.Right && y > myTabRect.Y && y < myTabRect.Bottom;if (isClose == true){//判断关闭的页面索引是否比正在显示的页面的索引//如果关闭的页面的索引大于或等于显示正在显示的页面索引，刚tabindex_close的值为关闭的页面的索引;//相反 的，刚tabindex_close则为tabindex_show-1;tabindex_close = this.tabControl1.SelectedIndex >= tabindex_show ? this.tabControl1.SelectedIndex : tabindex_close - 1;this.tabControl1.TabPages.Remove(this.tabControl1.SelectedTab);}else{tabindex_close = this.tabControl1.SelectedIndex;tabindex_show = this.tabControl1.SelectedIndex;}if (tabindex_close < tabindex_show){tabindex_show = tabindex_show - 1;}//显示页面try { this.tabControl1.SelectedTab = this.tabControl1.TabPages[tabindex_show]; }catch (Exception ex) { }Console.WriteLine("显示页面" + tabindex_show + "关闭页面" + tabindex_close);}}#endregion #region 关于tablepage的创建，以及窗体的附加/// <summary>/// 创建新的选项卡/// </summary>/// <param name="ParentForm">父窗体</param>/// <param name="ChildForm">子窗体</param>/// <param name="Pagename">页面名称</param>public void CreatePage(Form ParentForm,Form ChildForm, string Pagename){ChildForm.MdiParent = ParentForm;ChildForm.Text = "第二个窗体";ChildForm.Dock = DockStyle.Fill;ChildForm.TopMost = true;ChildForm.FormBorderStyle = FormBorderStyle.None;TabPage tb1 = AddPage(Pagename);tb1.Controls.Add(ChildForm);this.tabControl1.Controls.Add(tb1);ChildForm.Show();}/// <summary>/// 添加选项卡/// </summary>/// <param name="PageName">页面名称</param>/// <returns>一个页面</returns>public TabPage AddPage(string PageName){TabPage tabPage = new TabPage();tabPage.Location = new System.Drawing.Point(4, 21);tabPage.Name = PageName;tabPage.Padding = new System.Windows.Forms.Padding(3);tabPage.Size = new System.Drawing.Size(658, 410);tabPage.Text = PageName;tabPage.UseVisualStyleBackColor = true;return tabPage;}#endregion}#endregion

调用的方法，和上一篇的一样，

DrawTabControl dtc=null;dtc=new DrawTabControl(tabControl1,this.Font);dtc.ClearPage();

上面的代码是实例化了一个类，并调用ClearPage方法，注意，

1、在添加选项卡之前一定要调用ClearPage（）这个方法;

2、this.Font 解释为：System.Drawing.Font，它定义字符串的文本格式。具体作用还不太清楚，如果有懂的朋友，还望帮忙讲解一下;

Form3 fo3 = new Form3();dtc.CreatePage(this,fo3, "窗体");

上面的代码 为创建选项卡，其中this为父窗体 ，fo3为子窗体 ，第三个参数为窗体名