Changes to Notifier→Observer relations

The new Notifier→Observer relation chain:
	* Conversation → ConversationItem, ConversationView
	* User → UserListItem, UserInfoWindow, UserPopUp
	* Contact → RosterItem

These line up pretty intuitively― if something changes in the conversation, you
want the list item and view to change too.

But there's one more here that's less intuitive:
	* User → Conversation

If Conversation observes something from a user (i.e., status change), it
immediately knows to do one thing only: invalidate the user list, because
something's changed.

application/Conversation.cpp

@@ -32,6 +32,7 @@ Conversation::Conversation(BString id, BMessenger msgn)
 	fDateFormatter()
 {
 	fConversationItem = new ConversationItem(fName.String(), this);
+	RegisterObserver(fConversationItem);
 }
 
 
@@ -77,26 +78,24 @@ Conversation::ImMessage(BMessage* msg)
 void
 Conversation::ObserveString(int32 what, BString str)
 {
-	if (fChatView != NULL)
-		fChatView->ObserveString(what, str);
+	GetView()->InvalidateUserList();
+}
+
+
+void
+Conversation::ObserveInteger(int32 what, int32 value)
+{
+	GetView()->InvalidateUserList();
 }
 
 
 void
 Conversation::ObservePointer(int32 what, void* ptr)
 {
-	if (fChatView != NULL)
-		fChatView->ObservePointer(what, ptr);
+	GetView()->InvalidateUserList();
 }
 
 
-void
-Conversation::ObserveInteger(int32 what, int32 val)
-{
-	if (fChatView != NULL)
-		fChatView->ObserveInteger(what, val);
-}
-
 
 BMessenger
 Conversation::Messenger() const
@@ -162,6 +161,7 @@ void
 Conversation::RemoveUser(User* user)
 {
 	fUsers.RemoveItemFor(user->GetId());
+	user->UnregisterObserver(this);
 	GetView()->UpdateUserList(fUsers);
 }
 
@@ -190,6 +190,7 @@ Conversation::GetView()
 	logMsg.AddStrings("body", logs);
 	fChatView->MessageReceived(&logMsg);
 
+	RegisterObserver(fChatView);
 	return fChatView;
 }
 
@@ -290,6 +291,7 @@ Conversation::_EnsureUser(BMessage* msg)
 		fUsers.AddItem(id, user);
 		GetView()->UpdateUserList(fUsers);
 	}
+	user->RegisterObserver(this);
 	return user;
 }
 

application/Conversation.h

@@ -24,16 +24,15 @@ class Server;
 typedef KeyMap<BString, User*> UserMap;
 
 
-class Conversation : public Observer {
+class Conversation : public Notifier, public Observer {
 public:
 						Conversation(BString id, BMessenger msgn);
 
 	BString				GetId() const;
 
-	// Handles required state changes from an IM message; forwards to ChatWindow
 	void				ImMessage(BMessage* msg);
 
-	// Observer inherits; just forwards to ChatWindow
+	// Tell the ConversationView to invalidate user list
 	void				ObserveString(int32 what, BString str);
 	void				ObserveInteger(int32 what, int32 value);
 	void				ObservePointer(int32 what, void* ptr);

application/Server.cpp

@@ -162,7 +162,6 @@ Server::ImMessage(BMessage* msg)
 			BString statusMsg;
 			if (msg->FindString("message", &statusMsg) == B_OK) {
 				user->SetNotifyPersonalStatus(statusMsg);
-//				contact->GetView()->UpdatePersonalMessage();
 			}
 			break;
 		}

application/User.cpp

@@ -143,7 +143,7 @@ UserItem*
 User::GetListItem()
 {
 	if (fListItem == NULL) {
-		fListItem = new UserItem(fName, this);
+		fListItem = new UserItem(fName, this, (int32)fStatus);
 		RegisterObserver(fListItem);
 	}
 	return fListItem;

application/views/ConversationView.cpp

@@ -206,75 +206,29 @@ ConversationView::UpdateUserList(UserMap users)
 }
 
 
+void
+ConversationView::InvalidateUserList()
+{
+	for (int i = 0; i < fUserList->CountItems(); i++)
+		fUserList->InvalidateItem(i);
+}
+
+
 void
 ConversationView::ObserveString(int32 what, BString str)
 {
-//	switch (what) {
-//		case STR_CONTACT_NAME:
-//			if (Lock()) {
-//				SetTitle(str);
-//				Unlock();
-//			}
-//			break;
-//		case STR_PERSONAL_STATUS:
-//			break;
-//	}
 }
 
 
 void
 ConversationView::ObservePointer(int32 what, void* ptr)
 {
-//	switch (what) {
-//		case PTR_AVATAR_BITMAP:
-//			break;
-//	}
 }
 
 
 void
 ConversationView::ObserveInteger(int32 what, int32 val)
 {
-	switch (what) {
-		case INT_CONTACT_STATUS:
-			if (fUserList->CountItems() <= 2)
-				AppendStatus((CayaStatus)val);
-			break;
-	}
-}
-
-
-void
-ConversationView::AppendStatus(CayaStatus status)
-{
-	BString message(fContact->GetName());
-
-	switch (status) {
-		case CAYA_ONLINE:
-			message << " is available";
-			break;
-		case CAYA_AWAY:
-			message << " is away";
-			break;
-		case CAYA_DO_NOT_DISTURB:
-			message << " is busy, please do not disturb!";
-			break;
-		case CAYA_CUSTOM_STATUS:
-			message << " has set a custom status.";
-			break;
-		case CAYA_INVISIBLE:
-			message << " is invisible.";
-			break;
-		case CAYA_OFFLINE:
-			message << " is offline";
-			break;
-		default:
-			break;
-	}
-
-	fReceiveView->Append(message.String(), COL_TEXT, COL_TEXT, R_TEXT);
- 	fReceiveView->Append("\n", COL_TEXT, COL_TEXT, R_TEXT);
-	fReceiveView->ScrollToSelection();
 }
 
 

application/views/ConversationView.h

@@ -10,6 +10,7 @@
 
 #include "CayaConstants.h"
 #include "Conversation.h"
+#include "Observer.h"
 
 class BStringView;
 class BTextView;
@@ -20,7 +21,7 @@ class User;
 class UserListView;
 
 
-class ConversationView : public BGroupView {
+class ConversationView : public BGroupView, public Observer {
 public:
 						ConversationView();
 						ConversationView(Conversation* chat);
@@ -34,17 +35,16 @@ public:
 			Conversation* GetConversation();
 			void		SetConversation(Conversation* chat);
 
-
 			void		UpdateAvatar();
 			void		UpdatePersonalMessage();
+
 			void		UpdateUserList(UserMap users);
+			void		InvalidateUserList();
 
 			void		ObserveString(int32 what, BString str);
 			void		ObservePointer(int32 what, void* ptr);
 			void		ObserveInteger(int32 what, int32 val);
 
-			void		AppendStatus(CayaStatus status);
-
 			void		AvoidFocus(bool avoid);
 
 private: