Hi all,
I'd like to handle non-fltk events (coming from MS Windows) inside my FLTK
callbacks.
As far as I've understood:
1. I can't use Widget's handle() member function. It is passed *only*
FLTK-specific events.
2. I can't create my own "run loop", like this:
while (check ())
{
...
// process message here
...
}
since either check() or wait() do the dispatching before I can manually handle
the message.
3. I can only process custom events in callbacks registered with add_handler(),
through the fl_msg variable (holding the last MSG received), is that right?
I'd like to know if there's another way to handle custom messages?
For information, I've a class managing a hardware device which send messages
when something happened:
--------
const int my_hardware_event = ...;
class HardwareDevice
{
HWND NotifyWnd; // Window to send the message to
...
void OnDeviceNotification ()
{
// Notification from the hardware: send the my_hardware_event
// message to the window identified by NotifyWnd, with
// appropriate parameters
::PostMessage (NotifyWnd, my_hardware_event, wParam, lParam);
// (This design is kinda weird, I think GUI windows shouldn't
// be responsible to handle hardware messages, but that's not
// my class and I can't modify it.)
}
...
}
--------
I set NotifyWnd to be an FLTK window. When Windows receives the message posted
by the hardware class, it dispatches it to FLTK's run() - or check() or wait().
Then, in my FLTK application:
--------
int MySystemEventCallback (int event)
{
// Return 0 if this isn't our event, telling FLTK we don't want it
if (my_system_event != fl_msg.message) return 0;
// Otherwise, process the event and return 1
...
return 1;
}
Fl::add_handler (my_system_event_callback);
--------
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