remove channel/posted/forum info when no group is selected

retroshare-gui/src/gui/Posted/PostedListWidget.cpp

@@ -454,6 +454,10 @@ void PostedListWidget::applyRanking()
 	ui->scrollAreaWidgetContents->update();
 }
 
+void PostedListWidget::blank()
+{
+    clearPosts();
+}
 void PostedListWidget::clearPosts()
 {
 	/* clear all messages */

retroshare-gui/src/gui/Posted/PostedListWidget.h

@@ -63,6 +63,7 @@ protected:
 	virtual void insertAllPosts(const uint32_t &token, GxsMessageFramePostThread *thread);
 	virtual void insertPosts(const uint32_t &token);
 	virtual void clearPosts();
+	virtual void blank();
 	virtual bool navigatePostItem(const RsGxsMessageId& msgId);
 
 	/* GxsMessageFrameWidget */

retroshare-gui/src/gui/gxs/GxsMessageFramePostWidget.h

@@ -57,6 +57,7 @@ protected:
 	virtual void groupNameChanged(const QString &/*name*/) {}
 
 	virtual void clearPosts() = 0;
+	virtual void blank() = 0;
 	virtual bool navigatePostItem(const RsGxsMessageId& msgId) = 0;
 
 	/* Thread functions */

retroshare-gui/src/gui/gxs/GxsMessageFrameWidget.cpp

@@ -72,12 +72,11 @@ bool GxsMessageFrameWidget::isWaiting()
 
 void GxsMessageFrameWidget::setGroupId(const RsGxsGroupId &groupId)
 {
-	if (mGroupId == groupId) {
+	if (mGroupId == groupId  && !groupId.isNull())
-		if (!groupId.isNull()) {
 		return;
-		}
-	}
 
+    if(!groupId.isNull())
+	{
 		mAcknowledgeReadStatusToken = 0;
 		if (mStateHelper->isLoading(mTokenTypeAcknowledgeReadStatus)) {
 			mStateHelper->setLoading(mTokenTypeAcknowledgeReadStatus, false);
@@ -87,6 +86,12 @@ void GxsMessageFrameWidget::setGroupId(const RsGxsGroupId &groupId)
 
 		mGroupId = groupId;
 		groupIdChanged();
+	}
+    else
+    {
+        mGroupId.clear();
+        blank();	// clear the displayed data, because no group is selected.
+    }
 }
 
 void GxsMessageFrameWidget::setAllMessagesRead(bool read)

retroshare-gui/src/gui/gxs/GxsMessageFrameWidget.h

@@ -43,6 +43,7 @@ public:
 	virtual void groupIdChanged() = 0;
 	virtual QString groupName(bool withUnreadCount) = 0;
 	virtual QIcon groupIcon() = 0;
+    virtual void blank() =0;
 	virtual bool navigate(const RsGxsMessageId& msgId) = 0;
 	virtual bool isLoading();
 	virtual bool isWaiting();

retroshare-gui/src/gui/gxschannels/GxsChannelPostsWidget.cpp

@@ -596,6 +596,20 @@ void GxsChannelPostsWidget::clearPosts()
 	ui->fileWidget->clear();
 }
 
+void GxsChannelPostsWidget::blank()
+{
+	mStateHelper->setWidgetEnabled(ui->postButton, false);
+	mStateHelper->setWidgetEnabled(ui->subscribeToolButton, false);
+
+	clearPosts();
+
+    groupNameChanged(QString());
+
+	ui->infoWidget->hide();
+	ui->feedWidget->show();
+	ui->fileWidget->hide();
+}
+
 bool GxsChannelPostsWidget::navigatePostItem(const RsGxsMessageId &msgId)
 {
 	FeedItem *feedItem = ui->feedWidget->findGxsFeedItem(groupId(), msgId);

retroshare-gui/src/gui/gxschannels/GxsChannelPostsWidget.h

@@ -73,6 +73,7 @@ protected:
 	virtual bool useThread() { return mUseThread; }
 	virtual void fillThreadCreatePost(const QVariant &post, bool related, int current, int count);
 	virtual bool navigatePostItem(const RsGxsMessageId& msgId);
+    virtual void blank() ;
 
 	/* GxsMessageFrameWidget */
 	virtual void setAllMessagesReadDo(bool read, uint32_t &token);

retroshare-gui/src/gui/gxsforums/GxsForumThreadWidget.cpp

@@ -299,6 +299,28 @@ GxsForumThreadWidget::GxsForumThreadWidget(const RsGxsGroupId &forumId, QWidget
 
 }
 
+void GxsForumThreadWidget::blank()
+{
+	ui->progressBar->hide();
+	ui->progressText->hide();
+	ui->postText->clear() ;
+	ui->by_label->setId(RsGxsId()) ;
+	ui->time_label->clear();
+	ui->lineRight->hide();
+	ui->lineLeft->hide();
+	ui->by_text_label->hide();
+	ui->by_label->hide();
+	ui->postText->setImageBlockWidget(ui->imageBlockWidget) ;
+	ui->postText->resetImagesStatus(Settings->getForumLoadEmbeddedImages());
+    ui->threadTreeWidget->clear();
+	ui->forumName->setText("");
+
+    mStateHelper->setWidgetEnabled(ui->newthreadButton, false);
+	mStateHelper->setWidgetEnabled(ui->previousButton, false);
+	mStateHelper->setWidgetEnabled(ui->nextButton, false);
+	ui->versions_CB->hide();
+}
+
 GxsForumThreadWidget::~GxsForumThreadWidget()
 {
 	if (mFillThread) {

retroshare-gui/src/gui/gxsforums/GxsForumThreadWidget.h

@@ -58,6 +58,7 @@ public:
 
 	// Callback for all Loads.
 	virtual void loadRequest(const TokenQueue *queue, const TokenRequest &req);
+    virtual void blank();
 
 protected:
 	bool eventFilter(QObject *obj, QEvent *ev);