怎样创建一个简易的聊天框

class gfx.controls.Window extends UIComponent {

var WorldInfo ThisWorld;
var SFPlayerController PC;

var array<string> chatMessages; // this will hold all the chat messages
var bool bChatting;

// These are our CLIK widgets for the chat system
var GFxClikWidget MyChatInput, MyChatSendButton, MyChatLog;

function Init(optional LocalPlayer player)
{
  super.Init(player);
  ThisWorld = GetPC().WorldInfo;

  Start();
  Advance(0);

  // ... other initialization code here ...

  // Register the HUD with the PlayerController
  PC = SFPlayerController(GetPC());
  PC.registerHUD(self);
}

/** Toggles mouse cursor on/off */
function ToggleCursor(bool showCursor, float mx, float my)
{
  if (showCursor)
  {
    MouseContainer = CreateMouseCursor();
    MouseCursor = MouseContainer.GetObject("my_cursor");
    MouseCursor.SetPosition(mx,my);
    MouseContainer.SetBool("topmostLevel", true);
  }
  else
  {
    MouseContainer.Invoke("removeMovieClip", args);
    MouseContainer = none;
  }

  if (!bChatting)
  {
    bCaptureInput = showCursor;
    bIgnoreMouseInput = !showCursor;
  }
  else
  {
    bCaptureInput = true;
    bIgnoreMouseInput = false;
  }
}

event bool WidgetInitialized(name WidgetName, name WidgetPath, GFxObject Widget)
{
  switch(WidgetName)
  {
  case ('chatInput'):
    MyChatInput = GFxClikWidget(Widget);
    MyChatInput.AddEventListener('CLIK_press', OnChat);
    break;

  case ('chatSendBtn'):
    MyChatSendButton = GFxClikWidget(Widget);
    MyWidget.AddEventListener('CLIK_press', OnClickHandler);
    break;

  case ('chatLog'):
    MyChatLog = GFxClikWidget(Widget);
    break;

  default:
    break;
  }

  return true;
}

// Event Handler - handles when the player clicks on the chat box text input field.
function OnChat(GFxClikWidget.EventData ev)
{
  bChatting = true;
}

function OnChatSend(GFxClikWidget.EventData ev)
{
  local string Msg;

  Msg = MyChatInput.GetString("text");

  if (Msg != "")
  {
    PC.SendTextToServer(PC, Msg);
  }

  MyChatInput.SetString("text", "");
  self.bCaptureInput = false;
  bChatting = false;
}

function UpdateChatLog(string message)
{
  local string displayMsg;
  local int i;

  chatMessages.AddItem(message);

  displayMsg = "";

  for (i = 0; i < chatMessages.length; i++)
  {
    displayMsg @= chatMessages[i];
    displayMsg @= "\n";
  }

  MyChatLog.SetString("text", displayMsg);
  MyChatLog.SetFloat("position", MyChatLog.GetFloat("maxscroll"));
}

defaultproperties
{
    WidgetBindings.Add((WidgetName="chatInput",WidgetClass=class'GFxClikWidget'))
    WidgetBindings.Add((WidgetName="chatSendBtn",WidgetClass=class'GFxClikWidget'))
    WidgetBindings.Add((WidgetName="chatLog",WidgetClass=class'GFxClikWidget'))

    bIgnoreMouseInput = true;
    bCaptureInput = false;
}

var class<BroadcastHandler> BroadcastHandlerClass;
var BroadcastHandler BroadcastHandler;   // handles message (text and localized) broadcasts

event InitGame( string Options, out string ErrorMessage )
{
    Super.InitGame(Options, ErrorMessage);
    BroadcastHandler = spawn(BroadcastHandlerClass);
}

event Broadcast(Actor Sender, coerce string Msg, optional name Type)
{
  local SFPlayerController PC;
  local PlayerReplicationInfo PRI;

  // This code gets the PlayerReplicationInfo of the sender. 我们会使用它得到带有PRI.PlayerName的发送者的名字。
  if (Pawn(Sender) != None)
  {
    PRI = Pawn(Sender).PlayerReplicationInfo;
  }
  else if (Controller(Sender) != None)
  {
    PRI = Controller(Sender).PlayerReplicationInfo;
  }

  // This line executes a "Say"
  BroadcastHandler.Broadcast(Sender, Msg, Type);

  // This is where we broadcast the received message to all players (PlayerControllers)
  if (WorldInfo != None)
  {
    ForEach WorldInfo.AllControllers(class'SFPlayerController',PC)
    {
      `Log(Self$":: Sending "$PC$" a broadcast message from "$PRI.PlayerName$" which is '"$Msg$"'.");
      PC.ReceiveBroadcast(PRI.PlayerName, Msg);
    }
  }
}

defaultproperties
{
  PlayerControllerClass=class'SFPlayerController'
  BroadcastHandlerClass=class'Engine.BroadcastHandler'
  HUDType=class'SFTutorial.SFHudWrapper'
  bUseClassicHUD=true
}

class SFPlayerController extends UTPlayerController;

var SFHud MySFHud;

function registerHUD(SFHud hud)
{
  MySFHud = hud;
}

exec function SendTextToServer(SFPlayerController PC, String TextToSend)
{
  `Log(Self$":: Client wants to send '"$TextToSend$"' to the server.");
  ServerReceiveText(PC, TextToSend);
}

reliable server function ServerReceiveText(SFPlayerController PC, String ReceivedText)
{
  WorldInfo.Game.Broadcast(PC, ReceivedText, 'Say');
}

reliable client function ReceiveBroadcast(String PlayerName, String ReceivedText)
{
    `Log(Self$":: The Server sent me '"$ReceivedText$"' from "$PlayerName$".");
    MySFHud.UpdateChatLog(PlayerName @ ": " @ ReceivedText);
}

.Bindings=(Name="Enter",Command="ChatHandler")

.Bindings=(Name="Enter",Command="GBA_Use")

exec function ChatHandler()
{
  HudMovie.ToggleChat(); // Replace HudMovie with the reference name of your HUD movie.
}

AddFocusIgnoreKey('Enter');

function ToggleChat()
{
  if (!bChatting)
  {
    bCaptureInput = true;
    OnChat();
  }
  else
  {
    bCaptureInput = false;
    OnChatSend();
  }
}

function OnChat(optional GFxClikWidget.EventData ev)
function OnChatSend(optional GFxClikWidget.EventData ev)

MyChatInput.SetBool("focused", true);

MyChatLog.SetBool("focused", true);