FLTK windows in Mac OS X share the same system menu - macos

Question

When some application in OS X has multiple windows (many open documents, each in own window), it seems that all them share the same system menu, at least in FLTK. Is there a way to find the most recent selected window to send an event to it from the menu?
Here is my setup (Mac OS X 10.6.2, FLTK 1.3.3): have Shell class with system menu. Each time new document is opened, new Shell is created:
#ifdef __APPLE__
void Shell::macOpen(const char *fileName)
{
// If there are empty shell, open the model in it
if (s_empty != 0)
{
...
s_empty = 0;
}
// Otherwise, create new shell with the model
else
{
char *args[1];
args[0] = (char *) fileName;
new Shell(1, args, s_conf, s_dct, fileName, 1);
}
}
#endif
Then I keep track on the most recently selected Shell saving it into static Shell *Shell::s_current:
int Shell::handle(int event)
{
...
case FL_FOCUS:
#ifdef __APPLE__
// We just selected some shell, it is current.
s_current = this;
cout << "Select shell with address: [" << s_current << "]" << endl;
#endif
return 1;
...
}
This piece seems to work, as I can see the traces each time I select some Shell:
Select shell with address: [0x8206db0]
Select shell with address: [0x82375f0]
Select shell with address: [0x5d20650]
Select shell with address: [0x82375f0]
Now, given:
Shell *Shell::currentShell(Fl_Widget *w)
{
cout << "Widget address: [" << w << "]" << endl;
Shell *result = 0;
if (w != 0)
{
result = (Shell *) w->window();
cout << "Widget wingow address: [" << result << "]" << endl;
}
#ifdef __APPLE__
else
{
result = s_current;
cout << "Last selected shell address: [" << result << "]" << endl;
}
#endif
return result;
}
I have some callback:
void Shell::shortcutCB(Fl_Widget *w, void *data)
{
cout << "Shortcut" << endl;
Shell *ref = currentShell(w);
if (ref != 0)
{
...
}
}
When this callback is executed from the menu and more Shells are open, I get the following error:
Bus error
With no trace from either Shell::shortcutCB or Shell::currentShell. When the only Shell is open, all works perfectly. When more Shells are open and I close all but one, the error arises again. There is no problems when the same callback is called from some widget within Shell or is delivered from keyboard shortcut.

Answer 1

Solved the problem with the following 3 steps:
Declaring manu bar in OS X also static (here was the fail):
#ifdef __APPLE__
static Fl_Sys_Menu_Bar *s_menubar;
#else
Fl_Sys_Menu_Bar *m_menubar;
#endif
Save current Shell::s_current not only on FL_FOCUS event, but on any event handled by Shell, that is, each time it returns 1:
int Shell::handle(int event)
{
int result = 0;
switch (event)
{
// Set result = 1 when handling the event
...
}
#ifdef __APPLE__
if (result == 1)
{
// We just selected some shell, it is current.
s_current = this;
cout << "Select shell with address: [" << s_current << "]" << endl;
}
#endif
return result;
}
Use Shell::s_current for menu callbacks on OS X regardless of generating widget of the call:
Shell *Shell::currentShell(Fl_Widget *w)
{
Shell *result = 0;
#ifdef __APPLE__
result = s_current;
cout << "Last selected shell address: [" << result << "]" << endl;
#else
cout << "Widget address: [" << w << "]" << endl;
if (w != 0)
{
result = (Shell *) w->window();
cout << "Widget wingow address: [" << result << "]" << endl;
}
#endif
return result;
}