C＃如何在TabControl特定选项卡中触发键事件？

Question

我的表单中有一个TabControl1，其中有三个分别名为TabPage1，TabPage2和TabPage3的TabPage。

当TabPage 2具有焦点时，我需要引发一个键事件（用于导航的箭头键）。此事件不应在其他TabPage中引发。

任何人都知道吗？

Answer 1

在选定的事件处理程序上，您可以将发送方转换为适当的控件，并检查其名称。如果事件是从TabPage2生成的，则可以触发关键事件。

这样的东西

private void TabPage_Selected(object sender, EventArgs e)
{
  TabPage source = sender as TabPage;
  if(source.Name.equals("TabPage2"))
    //Do whatever...
}

Answer 2

您需要从TabControl派生您自己的控件，以便您可以拦截箭头键并生成事件。在您的项目中添加一个新类，并粘贴以下代码。编译。将新控件从工具箱的顶部拖放到您的窗体上。

using System;
using System.Windows.Forms;

class MyTabControl : TabControl {
  public event EventHandler<KeyEventArgs> ArrowKeys;

  protected void OnArrowKeys(KeyEventArgs e) {
    EventHandler<KeyEventArgs> handler = ArrowKeys;
    if (handler != null) handler(this, e);
  }
  protected override bool ProcessCmdKey(ref Message msg, Keys keyData) {
    if (keyData == Keys.Up || keyData == Keys.Down || keyData == Keys.Left || keyData == Keys.Right) {
      var e = new KeyEventArgs(keyData);
      OnArrowKeys(e);
      if (e.Handled) return true;
    }
    return base.ProcessCmdKey(ref msg, keyData);
  }
}

样本使用情况：

private void myTabControl1_ArrowKeys(object sender, KeyEventArgs e) {
  if (myTabControl1.SelectedIndex == 1) {
    // Do something with e.KeyData
    //...
    e.Handled = true;
  }
}

Answer 3

protected override bool ProcessCmdKey(ref Message m, Keys keyData)  
        {  
            bool blnProcess = false;  
            if (keyData == Keys.Left)  
            {  
                blnProcess = true;  
                MessageBox.Show("Key left");  
                if (myTabControl1.SelectedIndex == 1)  
                    MessageBox.Show("inside");  


             }
       }

此代码似乎有效因此，当我选择tabPage2时，当我按向左箭头键时，消息框会告诉我“内部”。

Probalby做某事不是正确的事，但至少现在可以起作用...

Answer 4

我在VB .NET中进行了此操作，如果您确实需要它，可以在C＃中发布它，但这应该向您展示如何处理事件的捕获。

Public Class Form1

    'give a variable as a TabPage here so we know which one is selected(in focus)
    Dim selectedPage As TabPage = TabPage1

    'If a key is pressed when the tab control has focus, it checks to see if it is the right tab page
    'and then show a message box(for demonstration)
    Private Sub TabControl1_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TabControl1.KeyDown
        'The IF Not is to basically catch any odd happening that might occur if a key stroke gets passed with
        'no selected tab page
        If Not selectedPage Is Nothing Then
            'If the tabpage is TabPage2
            If selectedPage.Name = "TabPage2" Then
                MessageBox.Show("Key Pressed")
            End If
        End If
    End Sub

    'This handles the actual chaning of the tab pages
    Private Sub TabControl1_Selected(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TabControlEventArgs) Handles TabControl1.Selected
        selectedPage = TabControl1.SelectedTab
    End Sub

现在您只需要使用实际的按键。

Michael Sarchet

Answer 5

private void Main_KeyUp(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.C) // I used the C Key
    {
        if (tabControl.SelectedIndex == 0) // control is only in tab 1 (index 0) endabled
        {
            // Your Code
        }
    }
}

Answer 6

msarchet的C＃版本的答案：

using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Security;
using System.Text;
using System.Threading.Tasks;
using Microsoft.VisualBasic;

public class Form1
{

    // give a variable as a TabPage here so we know which one is selected(in focus)
    private TabPage selectedPage = TabPage1;

    // If a key is pressed when the tab control has focus, it checks to see if it is the right tab page
    // and then show a message box(for demonstration)
    private void TabControl1_KeyDown(System.Object sender, System.Windows.Forms.KeyEventArgs e)
    {
        // The IF Not is to basically catch any odd happening that might occur if a key stroke gets passed with
        // no selected tab page
        if (!selectedPage == null)
        {
            // If the tabpage is TabPage2
            if (selectedPage.Name == "TabPage2")
                MessageBox.Show("Key Pressed");
        }
    }

    // This handles the actual chaning of the tab pages
    private void TabControl1_Selected(System.Object sender, System.Windows.Forms.TabControlEventArgs e)
    {
        selectedPage = TabControl1.SelectedTab;
    }
}

希望对您有帮助：）