source: npl/mediabox/lcdproc_edwin/src/server/input.c

/*

  input.c

  Handles keypad (and other?) input from the user.

  Currently, the keys are as follows:

  Context     Key      Function
  -------     ---      --------
  Normal               "normal" context is handled in this source file.
              A        Pause/Continue
              B        Back(Go to previous screen)
              C        Forward(Go to next screen)
              D        Open main menu
              E-Z      Sent to client, if any; ignored otherwise

 (menu keys are not handled here, but in the menu code)
  Menu
              A        Enter/select
              B        Up/Left
              C        Down/Right
              D        Exit/Cancel
              E-Z      Ignored
*/

#include <stdlib.h>
#include <stdio.h>

#include "../shared/sockets.h"
#include "../shared/debug.h"

#include "drivers/lcd.h"

#include "client_data.h"
#include "clients.h"
#include "screen.h"
#include "screenlist.h"
#include "menus.h"

#include "input.h"


int server_input(int key);

// FIXME!  The server tends to crash when "E" is pressed..  (?!)
// (but only when the joystick driver is the last one on the list...)

// Checks for keypad input, and dispatches it
int handle_input()
{
   char str[256];
   int key;
   screen *s;
   client *c;
   
   key = lcd.getkey();

   if (!key) return 0;

   debug("handle_input(%c)\n", (char)key);
   
   if(key)
   {
      s = screenlist_current();
      if(s)
      {
         c = s->parent;
         if(c)
         {
            // TODO:  Interpret and translate keys!
            // If the client should have this keypress...
            // Send keypress to client
            if(key >= 'E'  && key <= 'Z')
            {
               // TODO:  Implement client "acceptable key" lists
               sprintf(str, "key %c\n", key);
               sock_send_string(c->sock, str);
            }
            // Otherwise, tell the server about it.
            else
            {
               server_input(key);
            }
         }
         else
         {
            // If no parent, it means we're on the server screen.
            // so, the server gets all keypresses there.
            server_input(key);
         }
      }
   }

   return 0;
}



int server_input(int key)
{
   debug("server_input(%c)\n", (char)key);
   
   switch(key)
   {
      case 'A':
         if(screenlist_action == SCR_HOLD)
            screenlist_action = 0;
         else
            screenlist_action = SCR_HOLD;
         break;
      case 'B':
         screenlist_action = SCR_BACK;
         screenlist_prev();
         break;
      case 'C':
         screenlist_action = SCR_SKIP;
         screenlist_next();
         break;
      case 'D':
         debug("got the menu key!\n");
         server_menu();
         break;
      default:
         debug("server_input: Invalid key \"%c\" (%i)\n",
                 (char)key, key);
         break;
   }

   return 0;
}