Re: Transparent background

From:

=?Utf-8?B?UGV0ZXI=?= <Peter@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 19 Nov 2008 05:59:02 -0800

Message-ID:

<F10FE0B9-1650-45DB-9B11-63F44EF94882@microsoft.com>

I found solution,

added OnEraseBackground() for CMyTabCtrl derived from CTabCtrl,
and inside it commented:
// CTabCtrl::OnEraseBackground().
Added small code to the same function:

GetClientRect(&r);
r.top += 0;
r.bottom = r.top + 20;
COLORREF clrBack=GetSysColor(COLOR_3DFACE);
CBrush brBackground;
brBackground.CreateSolidBrush(clrBack);
pDC->FillRect(&r,&brBackground);

which erases only top part of CMyTabCtrl where are displayed tabs.

Peter

"AliR (VC++ MVP)" wrote:

At no point you can specify the clip rect using ExcludeClipRect that would
actually have any effect on the way the tab control is drawn.

AliR.

"Peter" <Peter@discussions.microsoft.com> wrote in message
news:0AD5A7A0-FB85-4235-B4C6-4572B8A116F0@microsoft.com...

I understand your both described methods how to make controls child of
CTabCtrl.
Second one seems to be good choice for me,
but it takes much of time, because in this application there are
dependencies among member functions of some controls and member functions
of
parent dialogs.

Still I am thinking about setting transparent background and I appear
that there is available GDI function ExcludeClipRect()
Why cannot be this function used to create CTabCtrl with excluded large
rectangle inside CTabCtrl ?

Peter

"AliR (VC++ MVP)" wrote:

I'm sorry but there is no other way to get around this problem other than
what I suggested. The controls or the child dialog have to be a child of
the tab control. Good luck with the transparent background thing: Here
is
an article I wrote about transparent static, you can see what is required
to
get that to work!
http://www.codeproject.com/KB/static/TransparentStaticCtrl.aspx
And here is how you would make a listbox transparent, which again will
not
apply to a tab control.
http://www.codeproject.com/KB/combobox/TransListBox.aspx

I don't know why you don't want to make the controls children of the tab.
but it is easy you can simply call SetParent on the child controls to
change
their parent to the tab control!

BOOL CMyDialogWithTab::OnInitDialog()
{
    CDialog::OnInitDialog();

    m_Child1.SetParent(&m_TabCtrl);
    m_Child2.SetParent(&m_TabCtrl);
    ...
}

or if you are putting all your controls in a dialog box and then putting
it
in the tab:
BOOL CMyDialogWithTab::OnInitDialog()
{
    CDialog::OnInitDialog();

    m_ChildDlg.Create(CMyChildDlg::IDD,&m_TabCtrl);

    ...
}

AliR.

"Peter" <Peter@discussions.microsoft.com> wrote in message
news:08922225-B6C7-4154-87D0-4016C6CC2B9D@microsoft.com...

I understand what do you recommend.
Problem is that in this application is not so simple process to adjust
it
by
your recommendation.
The most simple should be to set CTabCtrl background transparent and
then
forget
it forever.
How can I set transparent background in CTabCtrl ?
Or how to make functional "Transparent" property of CTabCtrl in
resource
editor ?

Peter

"AliR (VC++ MVP)" wrote:

You should make the child controls/dialog children of the tab control
instead of the main dialog, that way the tab control will never go on
top
of
the controls.
Normally one would put the controls to go on a tab in a dialog box
(Child
Dialog, not popup), and remove the border, and then create that dialog
as
the child of the tab control.

Planty of examples on codeproject.com

AliR.

"Peter" <Peter@discussions.microsoft.com> wrote in message
news:0E3B65C2-013B-4C37-BDBA-9C2CE2580677@microsoft.com...

Hi,
I am trying to add CTabCtrl into my modeless dialog.
I want to have all other buttons, editboxes, checkboxes placed on
dialog
surface
and only to change values for controls by active tab on my CTabCtrl.
So for all active tabs there are the same controls, only values are
changed.
I draw CTabCtrl in resource editor to include all dialog controls
with
exception of OK and Cancel buttons.
Problem is when CTabCtrl redraws itself then some dialog controls
stays
hidden.
I tried "Transparent" property in resource editor, but no success.
How can I enable that CTabCtrl will have transparent background to
see
always all controls which are directly on dialog surface ?
Or any other tip ?

Peter

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