Reorganize classes Fl_System_Driver and Fl_Screen_Driver

These virtual members are moved from Fl_Screen_Driver to Fl_System_Driver
- wait(double)
- ready()

These virtual members are moved from Fl_System_Driver to Fl_Screen_Driver
- copy(const char *stuff, int len, int clipboard, const char *type)
- void paste(Fl_Widget &widget, int clipboard, const char *type)
- clipboard_contains(const char *type)
- clipboard_notify_change()

These members are moved from Fl_X11_Screen_Driver to Fl_X11_System_Driver
- poll_or_select_with_delay(double time_to_wait)
- poll_or_select()
and are made virtual in preparation for the introduction of class
Fl_Unix_System_Driver.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/Fl_Screen_Driver.H b/src/Fl_Screen_Driver.H
index fae5b0ff2..e7a64b542 100644
--- a/src/Fl_Screen_Driver.H
+++ b/src/Fl_Screen_Driver.H
@@ -105,8 +105,6 @@ public:
   virtual void beep(int) {}
   // --- global events
   virtual void flush() {}                                  // must override
-  virtual double wait(double) { return 0.0; } // must override
-  virtual int ready() { return 0; }                        // must override
   virtual void grab(Fl_Window *) {}
   // --- global colors
   /* the default implementation of parse_color() may be enough */
@@ -203,6 +201,14 @@ public:
   virtual void default_icons(const Fl_RGB_Image *icons[], int count);
   // this one is implemented in print_button.cxx
   static int print_or_copy_window(Fl_Window*, bool, int);
+  // implement to support copy-to-clipboard
+  virtual void copy(const char */*stuff*/, int /*len*/, int /*clipboard*/, const char */*type*/) {}
+  // implement to support paste-from-clipboard
+  virtual void paste(Fl_Widget &, int /*clipboard*/, const char */*type*/) {}
+  // implement to support paste-from-clipboard
+  virtual int clipboard_contains(const char */*type*/) {return 0;}
+  //  implement to support paste-from-clipboard
+  virtual void clipboard_notify_change() {}
 };
 
 #endif // !FL_SCREEN_DRIVER_H