Add support for detection and processing of clean program termination request.

The default handling of cmd-Q/Quit program under MacOS was to terminate the
program if all its windows are closed without returning from FLTK's event loop.
This was running against a strong design feature of FLTK that programs
should always complete their event loop and return from main() when cleanly
terminating.

In the new code for the MacOS platform, cmd-Q/Quit program no longer terminates
the program. Instead, the event loop is interrupted and a call to Fl::program_should_quit()
allows to detect that program termination has been requested, if necessary.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12647 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 9 insertions, 0 deletions

diff --git a/src/Fl_System_Driver.cxx b/src/Fl_System_Driver.cxx
index c396c9e2f..62c5a765b 100644
--- a/src/Fl_System_Driver.cxx
+++ b/src/Fl_System_Driver.cxx
@@ -445,6 +445,15 @@ void Fl_System_Driver::gettime(time_t *sec, int *usec) {
   *usec = 0;
 }
 
+int Fl_System_Driver::run_also_windowless() {
+  return Fl::run();
+}
+
+int Fl_System_Driver::wait_also_windowless(double delay) {
+  Fl::wait(delay);
+  return Fl::first_window() != NULL;
+}
+
 //
 // End of "$Id$".
 //