I have a need to make a group of windows behave in an app modal fashion, while
being mutually non-modal. That is, the GUI in each of this group of windows is
still responsive, but nothing should be allow in windows that aren't part of
this group.
I'm part of the way there by running a private event loop and event filter. The
event filter blocks events for windows that aren't in the group (returns true
for those events) and allows them (returns false) if the target window is one
of the windows in the group.
But there is (at least) one flaw- other windows can be activated. That is, they
appear activated, but since I'm blocking any mouse and key events, they don't
do anything.
I'm wondering how Qt achieves the high-quality window modality that they use
for a dialog. Or is it just that window modality is something that both Windows
and Mac provide as an OS service, but what I want is not?
Thanks to all!
-John
An "IgorWindow" is a class w use to encapsulate the parts of a window that are
special to our application.
bool PauseForUserObject::eventFilter(QObject *watched, QEvent *event)
{
Q_UNUSED(watched);
bool result = false; // means "don't block this
event"
// This seems fragile. I have gone through the event type definition in
qcoreevent.h and I am blocking
// all the events that sound like GUI interaction events.
if (event->type() == QEvent::MouseButtonPress ||
event->type() == QEvent::MouseButtonRelease ||
event->type() == QEvent::MouseMove ||
event->type() == QEvent::KeyPress ||
event->type() == QEvent::KeyRelease ||
event->type() == QEvent::Wheel ||
event->type() == QEvent::DragEnter ||
event->type() == QEvent::DragMove ||
event->type() == QEvent::DragLeave ||
event->type() == QEvent::Drop ||
event->type() == QEvent::DragResponse)
{
IgorWindow * watchedWindow = IgorWindowFromQObject(watched);
if (watchedWindow == NULL)
result = true; // block it
else
{
result =
!_windowIsRelatedToInterestingWindow(watchedWindow);
}
}
if (event->type() == QEvent::Paint)
result = false; // allow paint
events for any window.
if (event->type() == QEvent::ContextMenu ||
event->type() == QEvent::MouseButtonDblClick ||
event->type() == QEvent::InputMethod ||
event->type() == QEvent::TabletMove ||
event->type() == QEvent::TabletPress ||
event->type() == QEvent::TabletRelease ||
event->type() == QEvent::OkRequest ||
event->type() == QEvent::HelpRequest ||
event->type() == QEvent::IconDrag ||
event->type() == QEvent::Shortcut ||
event->type() == QEvent::ShortcutOverride ||
event->type() == QEvent::WhatsThisClicked ||
event->type() == QEvent::EnterWhatsThisMode ||
event->type() == QEvent::LeaveWhatsThisMode ||
event->type() == QEvent::HoverEnter ||
event->type() == QEvent::HoverLeave ||
event->type() == QEvent::HoverMove ||
event->type() == QEvent::NonClientAreaMouseMove ||
event->type() == QEvent::NonClientAreaMouseButtonPress ||
event->type() == QEvent::NonClientAreaMouseButtonRelease ||
event->type() == QEvent::NonClientAreaMouseButtonDblClick ||
event->type() == QEvent::GrabMouse ||
event->type() == QEvent::UngrabMouse ||
event->type() == QEvent::GrabKeyboard ||
event->type() == QEvent::UngrabKeyboard ||
event->type() == QEvent::TouchBegin ||
event->type() == QEvent::TouchUpdate ||
event->type() == QEvent::TouchEnd
)
{
result = true; // block this event
}
return result; // this block EVERYTHING
}
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