implement mru time for folders, part of folder views, 251296, sr=mscott

mailnews/base/public/msgCore.h

@@ -59,6 +59,12 @@ class nsIMsgFolder;
  */
 #define SUMMARY_SUFFIX ".msf"
 
+/*
+ * These are folder property strings, which are used in several places.
+
+ */
+#define MRU_TIME_PROPERTY "MRUTime"
+
 /* NS_ERROR_MODULE_MAILNEWS is defined in mozilla/xpcom/public/nsError.h */
 
 /*

mailnews/base/util/nsMsgDBFolder.cpp

@@ -396,6 +396,12 @@ NS_IMETHODIMP nsMsgDBFolder::SetHasNewMessages(PRBool curNewMessages)
 {
   if (curNewMessages != mNewMessages) 
   {
+    // Only change mru time if we're going from doesn't have new to has new.
+    // technically, we should probably update mru time for every new message
+    // but we would pay a performance penalty for that. If the user
+    // opens the folder, the mrutime will get updated anyway.
+    if (curNewMessages) 
+      SetMRUTime();
     /** @params
      * nsIAtom* property, PRBool oldValue, PRBool newValue
      */
@@ -5201,3 +5207,12 @@ nsresult nsMsgDBFolder::GetMsgPreviewTextFromStream(nsIMsgDBHdr *msgHdr, nsIInpu
   return rv;
 }
 
+void nsMsgDBFolder::SetMRUTime()
+{
+  PRUint32 seconds;
+  PRTime2Seconds(PR_Now(), &seconds);
+  nsCAutoString nowStr;
+  nowStr.AppendInt(seconds);
+  SetStringProperty(MRU_TIME_PROPERTY, nowStr.get());
+}
+

mailnews/base/util/nsMsgDBFolder.h

@@ -107,13 +107,13 @@ public:
   nsresult GetMsgPreviewTextFromStream(nsIMsgDBHdr *msgHdr, nsIInputStream *stream);
 protected:
   
-	// this is a little helper function that is not part of the public interface. 
-	// we use it to get the IID of the incoming server for the derived folder.
-	// w/out a function like this we would have to implement GetServer in each
-	// derived folder class.
-	virtual const char* GetIncomingServerType() = 0;
+  // this is a little helper function that is not part of the public interface. 
+  // we use it to get the IID of the incoming server for the derived folder.
+  // w/out a function like this we would have to implement GetServer in each
+  // derived folder class.
+  virtual const char* GetIncomingServerType() = 0;
 
-	virtual nsresult CreateBaseMessageURI(const char *aURI);
+  virtual nsresult CreateBaseMessageURI(const char *aURI);
 
 
   // helper routine to parse the URI and update member variables
@@ -161,7 +161,7 @@ protected:
   virtual nsresult SpamFilterClassifyMessage(const char *aURI, nsIMsgWindow *aMsgWindow, nsIJunkMailPlugin *aJunkMailPlugin);
   virtual nsresult SpamFilterClassifyMessages(const char **aURIArray, PRUint32 aURICount, nsIMsgWindow *aMsgWindow, nsIJunkMailPlugin *aJunkMailPlugin);
 
-
+  void    SetMRUTime();
 protected:
   nsCOMPtr<nsIMsgDatabase> mDatabase;
   nsCString mCharset;