Add support for Fl::copy(..clipboard = 2..)

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10731 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl.H

@@ -837,8 +837,9 @@ public:
   // cut/paste:
   /**
   Copies the data pointed to by \p stuff to the selection buffer 
-  (\p destination is 0) or
-  the clipboard (\p destination is 1).
+  (\p destination is 0), the clipboard (\p destination is 1), or
+  both (\p destination is 2). Copying to both is only relevant on X11,
+  on other platforms it maps to the clipboard (1).
   \p len is the number of relevant bytes in \p stuff.
   \p type is always Fl::clipboard_plain_text.
   The selection buffer is used for

src/Fl_cocoa.mm

@@ -3457,6 +3457,9 @@ static void resize_selection_buffer(int len, int clipboard) {
  */
 void Fl::copy(const char *stuff, int len, int clipboard, const char *type) {
   if (!stuff || len<0) return;
+  if (clipboard >= 2)
+    clipboard = 1; // Only on X11 do multiple clipboards make sense.
+
   resize_selection_buffer(len+1, clipboard);
   memcpy(fl_selection_buffer[clipboard], stuff, len);
   fl_selection_buffer[clipboard][len] = 0; // needed for direct paste

src/Fl_win32.cxx

@@ -664,6 +664,8 @@ void fl_update_clipboard(void) {
 // call this when you create a selection:
 void Fl::copy(const char *stuff, int len, int clipboard, const char *type) {
   if (!stuff || len<0) return;
+  if (clipboard >= 2)
+    clipboard = 1; // Only on X11 do multiple clipboards make sense.
 
   // Convert \n -> \r\n (for old apps like Notepad, DOS)
   Lf2CrlfConvert buf(stuff, len);

src/Fl_x.cxx

@@ -994,6 +994,13 @@ static int get_xwinprop(Window wnd, Atom prop, long max_length,
 
 void Fl::copy(const char *stuff, int len, int clipboard, const char *type) {
   if (!stuff || len<0) return;
+
+  if (clipboard >= 2) {
+    copy(stuff, len, 0, type);
+    copy(stuff, len, 1, type);
+    return;
+  }
+
   if (len+1 > fl_selection_buffer_length[clipboard]) {
     delete[] fl_selection_buffer[clipboard];
     fl_selection_buffer[clipboard] = new char[len+100];