有没有办法禁用 TabControl 内的 TabPage？

Question

我真的不需要禁用它们，因为我要么禁用 TabControl 要么启用它。但是当 TabControl 被禁用时，我希望选项卡页面看起来被禁用（灰显）。

Answer 1

人们下面提到的单独的方法并不能解决问题，但结合起来就可以了。试试这个：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        //Disable tabPage2
        this.tabPage2.Enabled = false; // no casting required.
        this.tabControl1.Selecting += new TabControlCancelEventHandler(tabControl1_Selecting);
        this.tabControl1.DrawMode = TabDrawMode.OwnerDrawFixed;
        this.tabControl1.DrawItem += new DrawItemEventHandler(DisableTab_DrawItem);
    }
    private void DisableTab_DrawItem(object sender, DrawItemEventArgs e)
    {
        TabControl tabControl = sender as TabControl;
        TabPage page = tabControl.TabPages[e.Index];
        if (!page.Enabled)
        {
            //Draws disabled tab
            using (SolidBrush brush = new SolidBrush(SystemColors.GrayText))
            {
                e.Graphics.DrawString(page.Text, page.Font, brush, e.Bounds.X + 3, e.Bounds.Y + 3);
            }
        }
        else
        {
            // Draws normal tab
            using (SolidBrush brush = new SolidBrush(page.ForeColor))
            {
                e.Graphics.DrawString(page.Text, page.Font, brush, e.Bounds.X + 3, e.Bounds.Y + 3);
            }
        }
    }

    private void tabControl1_Selecting(object sender, TabControlCancelEventArgs e)
    {
        //Cancels click on disabled tab.
        if (!e.TabPage.Enabled)
            e.Cancel = true;
    }
}

Answer 2

尝试使用此代码，它可以工作：

private void tabControl1_Selecting(object sender, TabControlCancelEventArgs e)
        {
            if (e.TabPage == tabControl1.TabPages[1])
            {
                e.Cancel = true;
            }            
        }

在 if 条件中保留要禁用的选项卡页的索引或名称，我已将索引保留为 1。
:)

Answer 3

重写了 @Corylulu 提供的解决方案，将所有内容封装在控件本身中。

public class DimmableTabControl : TabControl
{
    public DimmableTabControl()
    {
        DrawMode = TabDrawMode.OwnerDrawFixed;
        DrawItem += DimmableTabControl_DrawItem;
        Selecting += DimmableTabControl_Selecting;
    }

    private void DimmableTabControl_DrawItem(object sender, DrawItemEventArgs e)
    {
        TabPage page = TabPages[e.Index];
        using(SolidBrush brush = new SolidBrush(page.Enabled ? page.ForeColor : SystemColors.GrayText))
        {
            e.Graphics.DrawString(page.Text, page.Font, brush, e.Bounds.X + 3, e.Bounds.Y + 3);
        }
    }

    private void DimmableTabControl_Selecting(object sender, TabControlCancelEventArgs e)
    {
        if(!e.TabPage.Enabled)
        {
            e.Cancel = true;
        }
    }
}