calcolo dimensione font (a partire da quella impostata) per stampa 132 col.

git-svn-id: svn://10.65.10.50/trunk@3989 c028cbd2-c16b-5b4b-a496-9718f37d4682

include/printer.cpp

@@ -2185,6 +2185,60 @@ const char* TPrinter::background_chars(int l) const
 { 
   return _finker == NULL ? "" : _finker->get_chars(l); 
 }
+
+///////////////////////////////////////////////////////////
+// Calcolo dimensione font
+///////////////////////////////////////////////////////////
+
+struct font_data
+{ 
+	TString _name;
+	int			_size;
+	int 		_columns;
+};
+
+BOOLEAN XVT_CALLCONV1 calc_font_callback(long data)
+{
+	font_data& fd = *(font_data*)data;
+  
+  // Create pint window
+  WINDOW win = xvt_print_create_win(printer().get_printrcd(), "Calcolo font");
+  
+  // Set print font
+  xvt_set_font(win, fd._name, XVT_FS_NONE, fd._size);
+
+  long pw, ph, phr, pvr; // Printer width, height, horizontal and vertical resolution
+  xvt_app_escape (XVT_ESC_GET_PRINTER_INFO, printer().get_printrcd(), &ph, &pw, &pvr, &phr);
+	
+	TString test(fd._columns);
+	test.fill('M', fd._columns);
+	for (int size = fd._size; size > 0; size--)
+	{
+    const int w = xvt_dwin_get_text_width(win, (char*)(const char*)test, fd._columns);
+		if (w <= phr)
+		  break;
+	}
+	
+	if (size > 0)
+	  fd._size = size;
+	
+  return FALSE;
+}
+
+int TPrinter::calc_font_size(int columns) const
+{ 
+  font_data fd;
+  fd._name = fontname();
+  fd._size = get_char_size();           
+  fd._columns = columns;
+	
+  xvt_print_open();
+  xvt_print_start_thread(calc_font_callback, (long)&fd);
+  xvt_print_close();
+	
+  return fd._size;
+}
+
  
 ///////////////////////////////////////////////////////////
 // Gestione fax