C / C++ / MFC

18-Jul-08 3:31

Can anyone help me to get the co-ordinates of a button in a dialog. I have tried with GetWindowRect and GetClientRect. Both are giving the window position only. I need the co-ordinates of a button control in a window. More interestingly, I can get the co-ordinates using the above methods for Picture control and Static control. Please advice.

Many thanks in advance.

Alan Balkany18-Jul-08 3:54

Re: Co-ordinates of a button [modified]

18-Jul-08 3:54

After you get the screen coordinates of the button, you can use CWnd::ScreenToClient () to transform the screen coordinates to the dialog's coordinates. See http://msdn.microsoft.com/en-us/library/7e1e9a57(VS.80).aspx[^]

bhanu_850918-Jul-08 4:20

18-Jul-08 4:20

Alan Balkany wrote:
After you get the screen coordinates of the button

Hello alan,

Thank you very much for your reply. Can you please tell me how to get the screen coordinates of the button.

Many thanks in advance.

modified on Friday, July 18, 2008 10:29 AM

Alan Balkany18-Jul-08 4:32

18-Jul-08 4:32

For example:

RECT rect;
GetDlgItem (IDC_BUTTON1)->GetWindowRect (&rect);  // Window coordinates.
ScreenToClient (&rect);                           // Dialog coordinates.

bhanu_850918-Jul-08 5:23

18-Jul-08 5:23

Dear Alan,
Thank you very much for your reply. I have the code below as per your guidance. But when I place the mouse over the button the Messagebox is not displayed, instead it is appearing when I place the mouse on the to area of the dialog window, but my control is placed on the bottom of the dialog window. Please advice.

void CdfdgDlg::OnMouseMove(UINT nFlags, CPoint point)
{
GetDlgItem (IDC_BUTTON9)->GetWindowRect (&rect);  // Window coordinates.
ScreenToClient (&rect);                           // Dialog coordinates.
ClientToScreen(&point);
if (rect.PtInRect(point))
{
	MessageBox(L"Correct");
}
CDialog::OnMouseMove(nFlags, point);
}

Alan Balkany18-Jul-08 5:42

Re: Co-ordinates of a button [modified]

18-Jul-08 5:42

The line, ClientToScreen(&point); is incorrect. I think this point is already in client coordinates, so remove this line.

bhanu_850921-Jul-08 2:21

21-Jul-08 2:21

Hello Alan,

I tried like the below. Strangely, when placing mouse over the button changes the bitmap and when I move the mouse over the dialog the button is painted again and again. If I place the mouse over other non-bitmap button and place again over the bitmapbutton didn't change the image. That is the event is triggered for the first time only.

//message map

ON_WM_MOUSEMOVE()
ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)

//funtions
LONG CdfdgDlg::OnMouseLeave(WPARAM , LPARAM) 
{

	POINT point;
	GetCursorPos(&point);
	ScreenToClient(&point);
	GetDlgItem (IDC_BUTTON4)->GetWindowRect (&rect);  // Window coordinates.
	ScreenToClient (&rect); 
	if (rect.PtInRect(point))
	{
		bool val=m_button4.LoadBitmaps(IDB_BITMAP4,0,IDB_BITMAP4,0);
		m_button4.Invalidate();
		m_button4.UpdateWindow();
	
	}
	
    return 0;
}

void CdfdgDlg::OnMouseMove(UINT nFlags, CPoint point)
{
	// TODO: Add your message handler code here and/or call default
	TRACKMOUSEEVENT trackmouseevent;
		trackmouseevent.cbSize = sizeof(trackmouseevent);
		trackmouseevent.dwFlags = TME_LEAVE;
		trackmouseevent.hwndTrack = GetSafeHwnd();
		trackmouseevent.dwHoverTime = HOVER_DEFAULT;
		_TrackMouseEvent(&trackmouseevent);
	GetDlgItem (IDC_BUTTON4)->GetWindowRect (&rect);  // Window coordinates.
	ScreenToClient (&rect); 
	if ((!rect.PtInRect(point)) )
	{
		mouse=true;
		bool val=m_button4.LoadBitmaps(IDB_BITMAP2,0,IDB_BITMAP2,0);
		m_button4.Invalidate();
		m_button4.UpdateWindow();
	}
	CDialog::OnMouseMove(nFlags, point);
}

modified on Monday, July 21, 2008 8:50 AM

Alan Balkany21-Jul-08 4:41

21-Jul-08 4:41

I'm not sure what your question is. It looks like you're reloading the button bitmaps every time there's a mouse move in your dialog, which probably isn't what you want to do.

bhanu_850923-Jul-08 2:55

23-Jul-08 2:55

Dear Alan,

Actually I am reloading the button everytime, because I have to change the bitmap of the button when mouse is over and mouse is leave from the button.

That's why I am reloading the bitmap of the button everytime there is mouse move and every time mouse over the button. Please advice me a good way to do this.

Many thanks in advance.

Alan Balkany23-Jul-08 8:08

23-Jul-08 8:08

OnMouseLeave () will only be called when the mouse leaves the dialog -- not the button.

Try handling both cases (mouse in button, mouse out of button) in the OnMouseMove () handler.

David Crow18-Jul-08 10:06

David Crow

18-Jul-08 10:06

bhanu_8509 wrote:
Both are giving the window position only.

Maybe because you are calling them in the context of a window rather than a control. You may, however, be getting screen and client coordinates confused.

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