Aha!! Thinking about why the draw() suggestion failed suggested
something that does work!
Thanks again Harvey! (and Ian and Matt)
///////////////////////////////////////////////////////
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Menu_Bar.H>
#include <FL/Fl_Menu_Item.H>
#include <unistd.h>
char const* const filename = "file1.txt";
Fl_Menu_Item theMenu[] = {
{"View", 0, 0, 0, 64, FL_NORMAL_LABEL, 0, 14, 0},
{filename, 0, 0, 0, FL_MENU_TOGGLE | FL_MENU_VALUE,
FL_NORMAL_LABEL, 0, 14, 0},
{0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0}
};
class MyMenuBar : public Fl_Menu_Bar {
public:
MyMenuBar(int x, int y, int w, int h, char const* label = 0)
: Fl_Menu_Bar(x, y, w, h, label)
, view_file1_(&theMenu[1])
{
menu(theMenu);
view_file1_->clear();
}
private:
Fl_Menu_Item* view_file1_;
int handle(int event)
{
if(event == FL_PUSH) {
if(!access(filename, R_OK)) {
view_file1_->activate();
}
else {
view_file1_->deactivate();
}
}
return Fl_Menu_Bar::handle(event);
}
};
class Window : public Fl_Double_Window {
public:
Window(int w, int h)
: Fl_Double_Window(w, h)
, menu_bar_(0, 0, w, 30)
{
end();
}
private:
MyMenuBar menu_bar_;
};
int main()
{
Window win(300, 500);
win.resizable(&win);
win.show();
return Fl::run();
}
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