I think I fixed the problem with a workaround.
This situation is probably a result from a mess in the window manager or in the
X server.
My main window was suddenly closed and looking at the code I saw:
int fl_handle(const XEvent& thisevent)
{
..
..
case ClientMessage: {
Atom message = fl_xevent->xclient.message_type;
const long* data = fl_xevent->xclient.data.l;
if ((Atom)(data[0]) == WM_DELETE_WINDOW) {
event = FL_CLOSE;
} else if (message == fl_XdndEnter) {
fl_xmousewin = window;
in_a_window = true;
fl_dnd_source_window = data[0];
..
..
}
So that is the only way I can get my window closed by FL_CLOSE.(Which was the
case).
Going forward with the code we have:
int Fl::handle(int e, Fl_Window* window)
e_number = e;
if (fl_local_grab) return fl_local_grab(e);
Fl_Widget* wi = window;
switch (e) {
case FL_CLOSE:
if (grab() || modal() && window != modal()) return 0;
wi->do_callback();
return 1;
..
And the default callback for Fl_Window classes is:
void Fl::default_atclose(Fl_Window* window, void* v) {
window->hide();
Fl_Widget::default_callback(window, v); // put on Fl::read_queue()
}
void (*Fl::atclose)(Fl_Window*, void*) = default_atclose;
void Fl_Window::default_callback(Fl_Window* win, void* v) {
Fl::atclose(win, v);
}
void Fl_Widget::default_callback(Fl_Widget *o, void * /*v*/) {
obj_queue[obj_head++] = o;
if (obj_head >= QUEUE_SIZE) obj_head = 0;
if (obj_head == obj_tail) {
obj_tail++;
if (obj_tail >= QUEUE_SIZE) obj_tail = 0;
}
}
So, my workaround was to set a callback in my mainwindow, that should never
close, that does nothing besides ensure that mainwindow is active(
this->show(); ). My intention here is to create a window that never gets
closed. This solution appears to be working.
The cause is related with WM_DELETE_WINDOW which I believe being from Window
Manager.
Just to explain, my application has a lot of windows... so the key generator
keeps opening and closing those windows, what probably should confuse WM or X.
Thanks,
J.Marcelo Auler
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