Why some text fields do not accept Control + A shortcut to select all by default

Question

I don’t know if the question is stupid, but I find several text fields here and there in my own program that accepts the shortcut Control + A to select all the text “by default” with “no encoding”.

I do not know what additional information I should give here, since I see absolutely no difference between these text fields. These are all simple drag and drop text fields.

Note. I am not talking about this piece of code:

if (e.Control && e.KeyCode == Keys.A) { textBox1.SelectAll(); } 

I want the default selection .. Or, anyway, change the property of the text field so that the text fields accept all the standard default labels.

Edit: Everything else ( Control + Z , Control + X , Control + C , Control + V ) works by default !!! Why not Control + A ??

Update: Text fields that accepted Ctrl+A by default were masked text fields , not regular ones. And at that moment I was with .NET 2.0. But I guess the original problem was something else, as I can see that <.NET> works fine by default in .NET 2.0 code.

Answer 1

You might be looking for the ShortcutsEnabled property. Setting it to true will allow your text fields to implement the shortcut Ctrl + A (among others). From the documentation:

Use the ShortcutsEnabled property to enable or disable the following keyboard shortcuts:

• Ctrl + Z

• Ctrl + E

• Ctrl + C

• Ctrl + Y

• Ctrl + X

• Ctrl + BACKSPACE

• Ctrl + V

• Ctrl + DELETE

• Ctrl + A

• SHIFT + DELETE

• Ctrl + L

• SHIFT + INSERT

• Ctrl + R

EDIT:
However, the documentation states:

The TextBox element does not support the Ctrl + A hotkey when Multiline is true.

You may have to use another subclass of TextBoxBase , such as RichTextBox , to make it work.

Answer 2

Indeed, CTRL + A will not work unless you add something like this:

  private void textBox1_KeyDown(object sender, KeyEventArgs e) { if (e.Control && (e.KeyCode == Keys.A)) { if (sender != null) ((TextBox)sender).SelectAll(); e.Handled = true; } } 

Answer 3

This answer worked for me on a similar question (which is not marked as accepted)

 protected override bool ProcessCmdKey(ref Message msg, Keys keyData) { const int WM_KEYDOWN = 0x100; var keyCode = (Keys) (msg.WParam.ToInt32() & Convert.ToInt32(Keys.KeyCode)); if ((msg.Msg == WM_KEYDOWN && keyCode == Keys.A) && (ModifierKeys == Keys.Control) && txtYourTextBox.Focused) { txtYourTextBox.SelectAll(); return true; } return base.ProcessCmdKey(ref msg, keyData); } 

Original post: How to enable ctrl + a with a TextBox in winform?

Answer 4

Make sure Application.EnableVisualStyles (); not commented on in static void Main ()

This can disable Ctrl + A

Answer 5

This question requires an answer that cannot be given in the form of code avoidance, since the Win32 API at the heart of other methods does not allow this. If other methods allow this, they just write the code for you. :)

So the real question is: what is the smallest, neatest way to do this? This worked for me:

Firstly, there is no need to handle WM_KEYDOWN! And there is no need to test the Ctrl key down already. I know that most of the examples here (and CodeProject and many others) all say that there is, but it does not cure the audio signal that occurs whenever a WM_CHAR that is not processed occurs.

Instead, try to process WM_CHAR and do Ctrl + A there:

 LRESULT CALLBACK Edit_Prc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam){ if(msg==WM_CHAR&&wParam==1){SendMessage(hwnd,EM_SETSEL,0,-1); return 1;} else return CallWindowProc((void*)WPA,hwnd,msg,wParam,lParam); } 

Remember to subclass the EDIT control to this Edit_Prc () using WPA = SetWindowLong (...), where WPA is the address of the window procedure for CallWindowProc (...)