How to create a virtual keyboard MFC for a application MFC?

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Hi everybody,

The last time, I used to coded a virtual keyboard embeded in a applicaiotn by C#, and this time, i must coded V-keyboard by MFC for 1 application MFC.

The work i did when i code VK by C#:
1. Create a form don't get focus when click on it.(override WndProc funtion of Form and process mesage to prevent focus in itself)
2. Create a button inherited Button base, and this button also don't get focus when click on it.
a. Override CreateParams funtion with "createParams.ExStyle = WS_EX_NOACTIVATE".
b. Override WndProc funtion and process WM_MOUSEACTIVATE message.
3. Make event sendkey when click on button.

And this is questions for virtual keyboard MFC:
1. How to create a CDialog don't get focus when click on it in MFC?
2. How to create a new button which the same with button i created by C# (above).

P/S: I searched on google for many days, but i still not find answer exactly.
Please help me!!!

I'm sorry,my english is not good. so difficult to explain more clearly.
Hope you try to help me.

Best regard.

Posted 7-Feb-11 15:50pm

tuandung2006

Updated 7-Feb-11 16:08pm

v2

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5 solutions

Solution 3

Thanks Olivier and Nishant. I understand your answer but the true is i don't know much about MFC,so i don't know that how to code? i just have code of C#.
Code C# for "Create a form don't get focus when click on it":
* In Keyboard class:

C#

protected override void WndProc(ref Message msg)
{
    if (msg.Msg == WM_ACTIVATE)
    {
        if (((int)msg.WParam & 0xFFFF) != WA_INACTIVE)
        {
            if (msg.LParam != IntPtr.Zero)
            {
                SetActiveWindow(msg.LParam);
            }
            else
            {
                SetActiveWindow(IntPtr.Zero);
            }
            base.WndProc(ref msg);
        }
    }
}

* In button class:

C#

protected override CreateParams CreateParams
    {
      get
      {
        CreateParams createParams = base.CreateParams;
        createParams.ExStyle = WS_EX_NOACTIVATE;
        return createParams;
      }
    }
protected override void WndProc(ref Message msg)
    {
      if (msg.Msg == WM_MOUSEACTIVATE)
      {
        msg.Result = (IntPtr)MA_NOACTIVATE;
      }
      else
        base.WndProc(ref msg);
    }

I coded for "Create a form don't get focus when click on it" successfull, but in button class, i don't know mean of CreateParams function, so i don't know how to convert it to MFC.
Please explain for me about it.

Please!!!

Posted 8-Feb-11 20:17pm

tuandung2006

Solution 5

Thanks Olivier somuch, I will try your code.

Posted 9-Feb-11 15:43pm

tuandung2006

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Olivier Levrey · Accepted Answer · 2011-02-08T23:17:00

I almost got it to work. I didn't add a new class for the button. Just do this:

To create the dialog box:

CNotFocusedDlg* dlg = new CNotFocusedDlg();
dlg->Create(IDD_NOT_FOCUSED);
dlg->ShowWindow(SW_SHOW);
//don't forget to delete the pointer
//when you don't need the dialog anymore

In your dialog class, add the WM_ACTIVATE and WM_MOUSEACTIVATE handlers with the following code:

In the .h:

class CNotFocusedDlg : public CDialog
{
	DECLARE_DYNAMIC(CNotFocusedDlg)
public:
	CNotFocusedDlg(CWnd* pParent = NULL);   // standard constructor
	virtual ~CNotFocusedDlg();
// Dialog Data
	enum { IDD = IDD_NOT_FOCUSED };
protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	DECLARE_MESSAGE_MAP()

	afx_msg void OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized);
	afx_msg int OnMouseActivate(CWnd* pDesktopWnd, UINT nHitTest, UINT message);
        afx_msg void OnBnClickedButton1();
};

Then in the .cpp:

BEGIN_MESSAGE_MAP(CNotFocusedDlg, CDialog)
    ON_WM_ACTIVATE()
    ON_WM_MOUSEACTIVATE()
    ON_BN_CLICKED(IDC_BUTTON1, &CNotFocusedDlg::OnBnClickedButton1)
END_MESSAGE_MAP()

void CNotFocusedDlg::OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized)
{
    if (nState == WA_ACTIVE || nState == WA_CLICKACTIVE)
    {
        if (pWndOther != NULL)
            pWndOther->SetActiveWindow();
    }

    CDialog::OnActivate(nState, pWndOther, bMinimized);
}

int CNotFocusedDlg::OnMouseActivate(CWnd* pDesktopWnd, UINT nHitTest, UINT message)
{
    return MA_NOACTIVATE;
}

void CNotFocusedDlg::OnBnClickedButton1()
{
    //do something here...
}

This code seems to work except for the first WM_ACTIVATE message. I tried to use the WM_EX_NOACTIVATE style but it seems I'm missing something there...
Anyway I hope it will help you a bit.

Olivier Levrey · Accepted Answer · 2011-02-08T06:38:00

I am not sure if it will work, but you may try to override the PreTranslateMessage function. Here, you can decide to process each message or not (WM_MOUSEACTIVATE for example).

To change the dialog styles, have a look to ModifyStyle and ModifyStyleEx

To send keyboard events from code, maybe this could help:
Keyboard Events Simulation using keybd_event() function[^]

Nish Nishant · Accepted Answer · 2011-02-08T06:44:00

Solution 2

Set the WS_EX_NOACTIVATE style for your keyboard dialog, that way it won't get focus. You should probably be able to get the same style to work on your button controls too.

Posted 8-Feb-11 6:44am

Nish Nishant

Updated 8-Feb-11 6:45am

v2

How to create a virtual keyboard MFC for a application MFC?

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