C / C++ / MFC

15-Jun-06 20:08

How can i change the dialog box background color dynamically. Confused | :confused:

Hamid_RT15-Jun-06 20:12

15-Jun-06 20:12

you ca use WM_CTLCOLORor WM_PAINT

whitesky

Member 303984315-Jun-06 20:18

15-Jun-06 20:18

But i want to chage the background depending on the color specified dynamically. I am getting an exception when i post the WM_CTLCOLOR message .
Thanks for ur reply,

Hamid_RT15-Jun-06 20:24

15-Jun-06 20:24

i guess you getting exception because use a brush,yes?
see here maybe it is some helpful to you

<br />
void CAnswerDlg::OnPaint()<br />
{<br />
	CPaintDC dc(this); // device context for painting<br />
dc.FillSolidRect(0,0,GetSystemMetrics (SM_CXSCREEN),GetSystemMetrics (SM_CYSCREEN),<br />
		RGB(53,97,200));<br />
}<br />
--------------<br />
HBRUSH CAnswerDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)<br />
{<br />
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);<br />
return (HBRUSH)GetStockObject(WHITE_BRUSH);<br />
}<br />
<br />

whitesky

Member 303984315-Jun-06 20:47

15-Jun-06 20:47

The code was working fine.
But the controls like edit box etc.. are not visible bcoz of FillSolidRect(). How can i solve this problem
Smile | :)

Hamid_RT15-Jun-06 21:02

15-Jun-06 21:02

Are you sure i test your problem but these are visible i used this code
(editbox,button,radio,..)are visible

<br />
COLORREF Color;<br />
Color=GetDC()->GetBkColor();<br />
....<br />
....<br />
void CAnswerDlg::OnPaint()<br />
{<br />
CPaintDC dc(this); // device context for painting<br />
dc.FillSolidRect(0,0,GetSystemMetrics (SM_CXSCREEN),GetSystemMetrics (SM_CYSCREEN),<br />
Color);<br />
}<br />
<br />
void CAnswerDlg::OnBnClickedButton1()<br />
{<br />
	Color=RGB(53,97,200);<br />
	Invalidate();<br />
}<br />

whitesky

Eytukan15-Jun-06 23:09

Eytukan

15-Jun-06 23:09

Though you could do it by these ways, HandlingWM_ERASEBKGND is the right one for it.

<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">--[ Jig | [Dance]

]--

[My Current Status]

Hamid_RT16-Jun-06 0:50

16-Jun-06 0:50

but i want to know why he cant show controls its attract for me to find answer for this question (of course i need to see his code that how to use)

whitesky

Member 303984317-Jun-06 2:00

17-Jun-06 2:00

My code is:

BOOL CSliderDlg::OnEraseBkgnd(CDC* pDC)
{

if(m_clr.GetPos()!=0)
{
int color=m_clr.GetPos();
COLORREF clr=RGB(color,color,color);
CRect rect;
GetClientRect(&rect);
pDC->FillSolidRect(&rect,clr);
}

return CDialog::OnEraseBkgnd(pDC);
}

I am calling this function from WM_HSCROLL handler.
m_clr is the slider ctrl.
If there is any mistake in my, let me that mistake.
Thanx. Smile | :)

Hamid_RT17-Jun-06 7:11

17-Jun-06 7:11

this code it seems not problem i tested this code and it work fine of course without if(m_clr.GetPos()!=0) like this

<br />
BOOL CAnswerDlg::OnEraseBkgnd(CDC* pDC) <br />
{<br />
//int color=m_clr.GetPos();<br />
COLORREF clr=RGB(53,97,200);<br />
CRect rect;<br />
GetClientRect(&rect);<br />
pDC->FillSolidRect(&rect,clr);<br />
return TRUE; <br />
}

and controls are visible you can use WM_CTLCOLOR with a brush and it work and i think it good for you

whitesky

Member 303984318-Jun-06 17:55

18-Jun-06 17:55

I want to change the back ground of dialog when i move the slider ctrl.
That's why i used int color=m_clr.GetPos();
Ths background of the dialog was changing but the controls are not visible.

NiceNaidu15-Jun-06 20:39

NiceNaidu

15-Jun-06 20:39

Try this

CRect rc;<br />
GetClientRect(&rc);<br />
//<br />
// Paint the client in the specified background color<br />
//<br />
pDC->FillSolidRect(&rc, m_clrBack);

Appu..
"If you judge people, you have no time to love them."

NiceNaidu15-Jun-06 20:46

NiceNaidu

15-Jun-06 20:46

Hey Sruthi,

Chk this.This contains everything.

http://www.nntu.sci-nnov.ru/DISLRN/cpppage/q117778.htm[^]

Appu..
"If you judge people, you have no time to love them."

Re: CDialog [modified]

Viorel.15-Jun-06 21:04

Viorel.

15-Jun-06 21:04

I think the appropriate place to change the background colour of your dialog box is the handler for WM_ERASEBKGND notification. You can put here just two lines:

BOOL CMyDlg::OnEraseBkgnd(CDC* pDC)
{
	pDC->FillRect(CRect(0,0,32000,32000), &CBrush(RGB(0,0,255))); // blue
	return TRUE;
}

If you need to vary the colour (or just to optimize the solution), make a CBrush member variable and use CreateSolidBrush to set the colour. You can use CreatePatternBrush or CreateHatchBrush to have another kind of background.

-- modified at 3:13 Friday 16th June, 2006

Naveen15-Jun-06 22:22

15-Jun-06 22:22

one way

HBRUSH MYDialog::OnCtlColor( CDC* pDC_i, CWnd* pWnd_i, UINT uCtlColor_i )
{
HBRUSH hDefaultBrush = CDialog::OnCtlColor( pDC_i, pWnd_i, uCtlColor_i );
if( CTLCOLOR_DLG == uCtlColor_i )
{
// Return a black brush so that the background become balck
return reinterpret_cast<hbrush>(GetStockObject( BLACK_BRUSH ));
}
return hDefaultBrush;
}

Another way from the InitInstance of the App class u may call

SetDialogBkColor( RGB(255,0,0) )

nave

Member 303984315-Jun-06 22:37

15-Jun-06 22:37

But the background color is not changing. Here is my code:
OnPaint()
{
.............
CSliderApp* app=(CSliderApp*)AfxGetApp();
app->ChangeDialogColor((COLORREF)m_clr.GetPos());
}

void CSliderApp::ChangeDialogColor(COLORREF ref)
{
SetDialogBkColor(ref);
}

Is there anything wrong Confused | :confused:

Hamid_RT15-Jun-06 22:54

15-Jun-06 22:54

what error you have previous error can you show your code that how to use to change background color

whitesky

Viorel.15-Jun-06 23:09

Viorel.

15-Jun-06 23:09

If you are using VS 2003 or VS 2005, you will found that the definition of SetDialogBkColor function in afxwin2.inl file is:

_AFXWIN_INLINE void CWinApp::SetDialogBkColor(COLORREF /*clrCtlBk*/, COLORREF /*clrCtlText*/)
{
}

Therefore it does nothing. Documentation says that it is obsolete. You should consider other solutions.

Re: CDialog [modified]

Naveen15-Jun-06 23:15

15-Jun-06 23:15

ok... i Understood

instead of calling the ChangeDialogColor from onPaint

call this Function as the first line of OnCtlColor funtion

nave

Member 303984316-Jun-06 2:04

16-Jun-06 2:04

No its not working.
Thanks for ur reply. Smile | :)

Naveen16-Jun-06 2:15

16-Jun-06 2:15

ok another way...

forgot every thing done before...Now do as below

1. Create a member variable of CBrush say m_BkBrush
2. Write Function like this

ChangeColor( COLORREF clr_i )
{
if( m_BkBrush.m_hObject )
m_BkBrush.DeleteObject();
m_BkBrush.CreateSolidBrush( clr_i )
Invalidate();
}

3. Call this function in the OnInitDialog and where ever u want to change the color
4. now overide the WM_CTLCOLOR message and inside that write as below

HBRUSH MYDialog::OnCtlColor( CDC* pDC_i, CWnd* pWnd_i, UINT uCtlColor_i )
{
HBRUSH hDefaultBrush = CDialog::OnCtlColor( pDC_i, pWnd_i, uCtlColor_i );
if( CTLCOLOR_DLG == uCtlColor_i )
{
return m_BkBrush;
}
return hDefaultBrush;
}

try and tell me the result..;)

nave

Member 303984316-Jun-06 20:34

16-Jun-06 20:34

Sorry, its not working. Frown | :(

Naveen16-Jun-06 20:40