bugs concerning the state of history arrow buttons fixed

src/net/java/sip/communicator/impl/gui/main/message/ChatConversationPanel.java

@@ -78,7 +78,7 @@ public class ChatConversationPanel
 
     private Date lastIncomingMsgTimestamp = new Date(0);
     
-    private Date pageFirstMsgTimestamp = new Date(System.currentTimeMillis());
+    private Date pageFirstMsgTimestamp = new Date(Long.MAX_VALUE);
     
     private Date pageLastMsgTimestamp = new Date(0);
     

src/net/java/sip/communicator/impl/gui/main/message/ChatPanel.java

@@ -127,7 +127,6 @@ public void run(){
                 loadHistoryPeriod();
             }
         }.start();
-        
     }
 
     /**
@@ -383,17 +382,12 @@ public void componentShown(ComponentEvent e) {
                 JTabbedPane tabbedPane = (JTabbedPane) parent;
                 if (tabbedPane.getSelectedComponent() == component) {
                     SwingUtilities.invokeLater(new Runnable() {
-                        public void run() {
-                            getChatWindow().setTitle(
-                                    getMetaContact().getDisplayName());
+                        public void run() {                           
 
                             chatWindow.setCurrentChatPanel(ChatPanel.this);
-                            
-                            chatWindow.getMainToolBar().changeHistoryButtonsSate(
-                                    ChatPanel.this);
-
+                           
                             writeMessagePanel.getEditorPane()
-                                    .requestFocus();
+                                    .requestFocus();                               
                         }
                     });
                 }
@@ -788,6 +782,8 @@ else if(o1 instanceof MessageReceivedEvent) {
                 this.lastHistoryMsgTimestamp = evt.getTimestamp();
             }
         }
+
+        this.chatWindow.getMainToolBar().changeHistoryButtonsState(this);
     }
 
     public Date getFirstHistoryMsgTimestamp()

src/net/java/sip/communicator/impl/gui/main/message/ChatWindow.java

@@ -186,7 +186,6 @@ public MainToolBar getMainToolBar()
     public ChatPanel createChat(MetaContact contact, PresenceStatus status,
         Contact protocolContact)
     {
-
         ChatPanel chatPanel = new ChatPanel(this, contact, protocolContact);
 
         this.contactChats.put(contact.getMetaUID(), chatPanel);
@@ -418,6 +417,10 @@ public ChatPanel getCurrentChatPanel()
     public void setCurrentChatPanel(ChatPanel currentChatPanel)
     {
         this.currentChatPanel = currentChatPanel;
+
+        this.setTitle(currentChatPanel.getMetaContact().getDisplayName());
+
+        this.getMainToolBar().changeHistoryButtonsState(currentChatPanel);
     }
 
     /**

src/net/java/sip/communicator/impl/gui/main/message/toolBars/MainToolBar.java

@@ -92,7 +92,8 @@ public MainToolBar(ChatWindow messageWindow) {
         this.setBorder(BorderFactory.createEmptyBorder(2, 2, 5, 2));
         
         this.nextButton.setEnabled(false);
-
+        this.previousButton.setEnabled(false);
+        
         this.add(saveButton);
         this.add(printButton);
 
@@ -374,7 +375,7 @@ public void run()
             
             conversationPanel.setDefaultContent();
             
-            changeHistoryButtonsSate(chatPanel);
+            changeHistoryButtonsState(chatPanel);
         }
     }
     
@@ -382,23 +383,30 @@ public void run()
      * Disables/Enables history arrow buttons depending on whether the
      * current page is the first, the last page or a middle page.
      */
-    public void changeHistoryButtonsSate(ChatPanel chatPanel)
-    {
+    public void changeHistoryButtonsState(ChatPanel chatPanel)
+    {   
         ChatConversationPanel convPanel = chatPanel.getChatConversationPanel();
         
-        if(chatPanel.getFirstHistoryMsgTimestamp() == null)
+        Date firstMsgInHistory = chatPanel.getFirstHistoryMsgTimestamp();
+        Date lastMsgInHistory = chatPanel.getLastHistoryMsgTimestamp();
+        Date firstMsgInPage = convPanel.getPageFirstMsgTimestamp();
+        Date lastMsgInPage = convPanel.getPageLastMsgTimestamp();
+        
+        if(firstMsgInHistory == null || lastMsgInHistory == null) {
+            previousButton.setEnabled(false);
+            nextButton.setEnabled(false);
             return;
+        }
         
-        if(chatPanel.getFirstHistoryMsgTimestamp()
-            .compareTo(convPanel.getPageFirstMsgTimestamp()) < 0) {
+        if(firstMsgInHistory.compareTo(firstMsgInPage) < 0) {
             previousButton.setEnabled(true);
         }
         else {
             previousButton.setEnabled(false);
         }
         
-        if(chatPanel.getLastHistoryMsgTimestamp()
-            .compareTo(convPanel.getPageLastMsgTimestamp()) > 0) {
+        if(lastMsgInPage.getTime() > 0
+                && (lastMsgInHistory.compareTo(lastMsgInPage) > 0)) {
             nextButton.setEnabled(true);
         }
         else {