C# 重繪tabControl，新增關閉按鈕（續）
阿新 • • 發佈：2019-01-03
在上一篇隨筆中，新增關閉按鈕是可以實現 ，但細心一點就會發現，每次關閉一個選項卡，tableControl都會自動跳到第一個頁面，顯然 這不是我們想要的，為此，我修改了部分的程式碼。除此之外，我還添加了一些兩個新的方法，用於建立新的tablePage.以下是我實現 的類
#region 重繪tablecontrol的類(新增關閉頁面功能),ablepage的建立，以及窗體的附加
public class DrawTabControl
{
TabControl tabControl1 = null;
Font font1 = null;
//開啟和關閉的頁面索引
int tabindex_show = 0;
int tabindex_close = 0;
public DrawTabControl() { }
/// <summary>
/// 初始化
/// </summary>
/// <param name="tabcontrol">TacControl控制元件</param>
/// <param name="fo">主程式this.Font</param>
public DrawTabControl(TabControl tabcontrol,Font fo)
{
tabControl1 = tabcontrol;
font1 = fo;
}
#region 關於tabcontrol的重繪
const int CLOSE_SIZE = 15;//大小
//tabPage標籤圖片
Bitmap image = new Bitmap("D:\\power_003.png");
public void ClearPage()
{
//清空控制元件
//this.MainTabControl.TabPages.Clear();
//繪製的方式OwnerDrawFixed表示由窗體繪製大小也一樣
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>
/// 產生新的窗體時觸發
/// </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);
//先新增TabPage屬性
e.Graphics.DrawString(this.tabControl1.TabPages[e.Index].Text, this.font1, SystemBrushes.ControlText, myTabRect.X + 2, myTabRect.Y + 2);
//再畫一個矩形框
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);
}
//畫關閉符號
using (Pen objpen = new Pen(Color.Black))
{
////=============================================
//自己畫X
////"\"線
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);
////"/"線
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);
////=============================================
//使用圖片
//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>
/// 滑鼠點選選項卡時的觸發
/// </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;
//計算關閉區域
Rectangle myTabRect = this.tabControl1.GetTabRect(this.tabControl1.SelectedIndex);
myTabRect.Offset(myTabRect.Width - (CLOSE_SIZE + 3), 2);
myTabRect.Width = CLOSE_SIZE;
myTabRect.Height = CLOSE_SIZE;
//如果滑鼠在區域內就關閉選項卡,如果不在就顯示選項卡
//如果關閉的選項卡正好開啟著，則關閉當前先項卡，顯示下一個選項卡
bool isClose = x > myTabRect.X && x < myTabRect.Right && y > myTabRect.Y && y < myTabRect.Bottom;
if (isClose == true)
{
//判斷關閉的頁面索引是否比正在顯示的頁面的索引
//如果關閉的頁面的索引大於或等於顯示正在顯示的頁面索引，剛tabindex_close的值為關閉的頁面的索引;
//相反 的，剛tabindex_close則為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;
}
//顯示頁面
try { this.tabControl1.SelectedTab = this.tabControl1.TabPages[tabindex_show]; }
catch (Exception ex) { }
Console.WriteLine("顯示頁面" + tabindex_show + "關閉頁面" + tabindex_close);
}
}
#endregion
#region 關於tablepage的建立，以及窗體的附加
/// <summary>
/// 建立新的選項卡
/// </summary>
/// <param name="ParentForm">父窗體</param>
/// <param name="ChildForm">子窗體</param>
/// <param name="Pagename">頁面名稱</param>
public void CreatePage(Form ParentForm,Form ChildForm, string Pagename)
{
ChildForm.MdiParent = ParentForm;
ChildForm.Text = "第二個窗體";
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>
/// 新增選項卡
/// </summary>
/// <param name="PageName">頁面名稱</param>
/// <returns>一個頁面</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