C＃如何在tabcontrol特定選項卡中觸發關鍵事件？

Question

我有一個tabControl1在我的窗體中有三個TabPages，名爲TabPage1，TabPage2和TabPage3。

當TabPage 2有焦點時，我需要引發一個關鍵事件（導航箭頭鍵）。 此事件不應在其他TabPages中引發。

任何人都知道如何？

Answer 1

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"); 


      } 
     } 

此代碼似乎工作 所以，當我選擇了tabPage2一個消息告訴我的「內部」當我按下左箭頭鍵。

Probalby不正確的事情做的事情，但ATLEAST它的工作原理現在...

Answer 2

在選定的事件處理程序中，您可以將發件人轉換爲適當的控件並檢查其名稱。如果事件是從TabPage2生成的，則可以觸發該關鍵事件。

像這樣的事情

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

Answer 3

你需要得到從TabControl的自己的控制，這樣就可以攔截箭頭鍵和生成的事件。爲您的項目添加一個新類並粘貼下面顯示的代碼。編譯。將新的控件從工具箱的頂部拖放到表單上。

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); 
    } 
} 

使用示例的形式：

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

Answer 4

我這樣做在VB .NET中，我可以將它張貼在C＃中，如果你真的需要它，但是這應該告訴你如何處理的捕事件。

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 

而現在你只需要使用實際的按鍵。

邁克爾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 
     } 
    } 
}