help!!!I got a trouble !about x11eventfilter!!

[ohmysweetbaby]

I destroy one window,just only one;but XSERVER will send five destroynotify to my client;why?

help me !thanks!!

here is my codes:

#if defined(Q_WS_X11)
App::App():public QApplication
{
     display=QX11Info::display();// XOpenDisplay("0:0");
    if (display == NULL)
    {
        printf("Cannot connect to X server " );
        exit (-1);
    };
    XSelectInput(display,QX11Info::appRootWindow(QX11Info::appScreen()),SubstructureNotifyMask);
}
 
bool App::x11EventFilter(XEvent *xe)
{
 
     switch (xe->type)
     {
 
    case Expose:
           return true;
 
     case ConfigureNotify:
        printf("resize1\n");
        return true;
     case DestroyNotify:
        printf("destroy\n");
        return true;
     default:
        return false;
     }
}
 #endif

#if defined(Q_WS_X11)
App::App():public QApplication
{
     display=QX11Info::display();// XOpenDisplay("0:0");
    if (display == NULL)
    {
        printf("Cannot connect to X server " );
        exit (-1);
    };
    XSelectInput(display,QX11Info::appRootWindow(QX11Info::appScreen()),SubstructureNotifyMask);
}

bool App::x11EventFilter(XEvent *xe)
{

     switch (xe->type)
     {

    case Expose:
           return true;

     case ConfigureNotify:
        printf("resize1\n");
        return true;
     case DestroyNotify:
        printf("destroy\n");
        return true;
     default:
        return false;
     }
}
 #endif

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Added after 4 minutes:

and another question,
when i use QApplication::x11eventfilter(),i find my appwindow cannot redraw itself if some other sub-window cover it,

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Added after 13 minutes:

and
When I move my mouse to the GNOME's taskbar ,XSERVER will also create a destroy event ,even if no clicked

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Added after 36 minutes:

can u understand what I wanna say?
my english is not very well for i am chinese;

[wysota]

You might want to call the base class implementation instead of returning false. It doesn't astonish me that your widget is not redrawn if you are discarding all Expose events.

[ohmysweetbaby]

thanks for your answer ，and，which function should I use to redrawn my widget?
e.x.
case expose:
widget.repaint();???

it seems doesn't work..

You might want to call the base class implementation instead of returning false??

can u give me some more details?
I dont know how to write if I call the base class implementation instead of returning false;

[wysota]

Why do you want to do anything on Expose? Let Qt handle it. Just don't return true from the filter when you encounter the event.

[ohmysweetbaby]

how to write if i dont return true？return false?
sorry, i just started to learn QT

[wysota]

Why did you put "case Expose" in your filter? If you just started with Qt then messing with x11EventFilter is probably a very bad idea.

[ohmysweetbaby]

but if I remove "case Expose",my wiget still can not redrawn itself


and if I dont use the x11eventfilter function,i cant grab subwindow event;

[wysota]

First of all call the base class implementation instead of returning false. And never return true unless you are sure this is what you want to do.

[ohmysweetbaby]

thanks，I have solved this problem about redrawn,there is still some stuff make me crazy,but thanks for your help,i can move on