gtk3 black wxFrame problem

[cutecode]

Debian 9, gtk3

After moving from gtk2 to gtk3, all wxFrames are black before controls are showed up on it.
I downloaded wx-master and there's no change.

Catching events

Code: Select all

	EVT_ERASE_BACKGROUND(dMyFrame::OnEraseBackground)
	EVT_PAINT(dMyFrame::OnPaint)

did not help

I compiled minimum application and if I resize it with mouse, then it becomes black while resizinig.

I found that OS "system monitor" becomes black too, before controls showed up.

So I think it is problem with my theme, but whatever themes I tried - the same efect

Is there a solution to make my on background color on GTK3.
wxFrame do becomes with my backround color, but only after all controls are showed up.
I dont have this behaver on GTK2

[DavidHart]

Hi,

Possibly a variant of https://wiki.wxwidgets.org/WxFAQ#Why_ar ... log_boxes..

In any case, it fixes/prevents various issues to do with size/colour/events/etc if you always add a wxPanel to a wxFrame as the frame's only child control, and then do everything else inside that panel (and that panel's sizer).

Regards,

David

[cutecode]

hello, not my case.
I already have wxPanel on wxFrames and wxDialgs

As I wrote bofore
wxFrame do becomes with my backround color, but only after all controls are showed up.

[DavidHart]

But...

EVT_ERASE_BACKGROUND(dMyFrame::OnEraseBackground)
EVT_PAINT(dMyFrame::OnPaint)

If you have a panel filling the frame, surely you should be erasing/painting that panel instead.

FWIW, I don't have that sort of problem with debian 10 and gtk3, and I didn't previously with debian 9. Which DE and Window manager are you using?

[cutecode]

LightDM MATE

I put OnEraseBackground and OnPaint both on wxFrame and wxPanel
I even put different colours on them "red" and "green" respectively, to see how it works

"green" color never is seen, but "red" is pained only if I set SetAutoLayout(true); and comment "Sisers"
After opening wxFrame it becoms black and then in red color

[cutecode]

hello

I attached video how it blinks on GTK3

[DavidHart]

I see what you mean.

Not quite the same situation but, FWIW, this is an old comment from my own code:

Code: Select all

void FileDirDlg::OnEraseBackground(wxEraseEvent& event)  // This is only needed in gtk2 under kde and brain-dead theme-manager, but can cause a blackout in some gtk3(themes?)

So, do you actually need to erase/paint with gtk3?

If you do, you need to work out what actually causing the problem. I suggest you try to reproduce it in the 'minimal' sample, then test with a different DE, a different window manager; and, best of all, a more recent gtk+3 version.

[ONEEYEMAN]

Hi,
Are you using wxPaintDC? Or any other DC?

Thank you.

[cutecode]

shure

Code: Select all

dMyFrame::dMyFrame(wxFrame *parent, LPCTSTR lpszCaption, const wxPoint& point, const wxSize& size, int style)
{
    SetBackgroundStyle(wxBG_STYLE_PAINT);

	Create(	parent,	wxID_ANY,	lpszCaption,	point, size, style);
	SetAutoLayout(true);
}
void dMyFrame::OnEraseBackground(wxEraseEvent& event)
{
    wxPaintDC dc(this);

    wxBrush brush(wxColor("red"));
    dc.SetBackground(brush);
    dc.Clear();
}

void dMyFrame::OnPaint(wxPaintEvent& event)
{
    wxPaintDC dc(this);

    wxBrush brush(wxColor("red"));
    dc.SetBackground(brush);
    dc.Clear();
}

[ONEEYEMAN]

Hi,
And drawing and image samples works OK?

Thank you.

[doublemax]

I don't know if it matters, but:

a) If you set wxBG_STYLE_PAINT, you don't need OnEraseBackground

b) You should not create a wxPaintDC inside a EVT_ERASE_BACKGROUND event handler (use wxEraseEvent::GetDC() )

Check if commenting out the SetBackgroundStyle() call makes any difference

[cutecode]

Hello

I tried it befor posting

I just cleaned GTK3 and rebuilding wx back with GTK2

Thank you

[cutecode]

Hello!

I was trying to build wx on Debian 10, and found that webkitgtk is not supported on this platform.

So back to GTK3.

I did as doublemax sugested

1. removed wxBG_STYLE_PAINT style
2. rewrote OnEraseBackground as

Code: Select all

    wxDC *dc = event.GetDC();

    wxBrush brush(GetFormBgColor());
    dc->SetBackground(brush);
    dc->Clear();

3. removed freeze/thaw

Now it is much better, but still blinks black for some period of time

without freeze/thaw I have less blinks

[cutecode]

Hello!

I installed wx on debian 10 with GTK3 build.

The above problem has gone.

Thanks to all for help !!!