feat: load messages from the database after date

src/chatlog/chatlog.cpp

@@ -382,6 +382,22 @@ void ChatLog::insertChatlineAtBottom(ChatLine::Ptr l)
     updateTypingNotification();
 }
 
+void ChatLog::insertChatlineAtBottom(const QList<ChatLine::Ptr>& newLines)
+{
+    if (newLines.isEmpty())
+        return;
+
+    for (ChatLine::Ptr l : newLines) {
+        l->setRow(lines.size());
+        l->addToScene(scene);
+        l->visibilityChanged(false);
+        lines.append(l);
+    }
+
+    layout(lines.last()->getRow(), lines.size(), useableWidth());
+    startResizeWorker();
+}
+
 void ChatLog::insertChatlineOnTop(ChatLine::Ptr l)
 {
     if (!l.get())
@@ -718,8 +734,12 @@ void ChatLog::checkVisibility(bool causedByScroll)
         emit firstVisibleLineChanged(visibleLines.at(0));
     }
 
-    if (causedByScroll && lowerBound != lines.cend() && lowerBound->get()->row == 0) {
+    if (causedByScroll) {
-        emit loadHistoryLower();
+        if (lowerBound != lines.cend() && lowerBound->get()->row == 0) {
+            emit loadHistoryLower();
+        } else if (upperBound != lines.cend() && upperBound->get()->row >= lines.size() - 10) {
+            emit loadHistoryUpper();
+        }
     }
 }
 

src/chatlog/chatlog.h

@@ -43,6 +43,7 @@ public:
     virtual ~ChatLog();
 
     void insertChatlineAtBottom(ChatLine::Ptr l);
+    void insertChatlineAtBottom(const QList<ChatLine::Ptr>& newLines);
     void insertChatlineOnTop(ChatLine::Ptr l);
     void insertChatlinesOnTop(const QList<ChatLine::Ptr>& newLines);
     void clearSelection();
@@ -73,6 +74,7 @@ signals:
     void workerTimeoutFinished();
     void firstVisibleLineChanged(const ChatLine::Ptr&);
     void loadHistoryLower();
+    void loadHistoryUpper();
 
 public slots:
     void forceRelayout();

src/widget/form/genericchatform.cpp

@@ -356,6 +356,7 @@ GenericChatForm::GenericChatForm(const Contact* contact, IChatLog& chatLog,
             &GenericChatForm::onChatContextMenuRequested);
     connect(chatWidget, &ChatLog::firstVisibleLineChanged, this, &GenericChatForm::updateShowDateInfo);
     connect(chatWidget, &ChatLog::loadHistoryLower, this, &GenericChatForm::loadHistoryLower);
+    connect(chatWidget, &ChatLog::loadHistoryUpper, this, &GenericChatForm::loadHistoryUpper);
 
     connect(searchForm, &SearchForm::searchInBegin, this, &GenericChatForm::searchInBegin);
     connect(searchForm, &SearchForm::searchUp, this, &GenericChatForm::onSearchUp);
@@ -812,7 +813,10 @@ void GenericChatForm::onLoadHistory()
     if (dlg.exec()) {
         QDateTime time = dlg.getFromDate();
         auto idx = firstItemAfterDate(dlg.getFromDate().date(), chatLog);
-        renderMessages(idx, chatLog.getNextIdx());
+        auto end = ChatLogIdx(idx.get() + 100);
+        chatWidget->clear();
+        messages.clear();
+        renderMessages(idx, end);
     }
 }
 
@@ -993,6 +997,18 @@ void GenericChatForm::loadHistoryLower()
     renderMessages(begin, chatLog.getNextIdx());
 }
 
+void GenericChatForm::loadHistoryUpper()
+{
+    auto begin = messages.end()->first;
+
+    int add = 100;
+    if (begin.get() + 100 > chatLog.getNextIdx().get()) {
+        add = chatLog.getNextIdx().get() - (begin.get() + 100);
+    }
+    auto end = ChatLogIdx(begin.get() + add);
+    renderMessages(begin, end);
+}
+
 void GenericChatForm::updateShowDateInfo(const ChatLine::Ptr& line)
 {
     const auto date = getTime(line);

src/widget/form/genericchatform.h

@@ -127,6 +127,7 @@ protected slots:
                         std::function<void(void)> onCompletion = std::function<void(void)>());
 
     void loadHistoryLower();
+    void loadHistoryUpper();
 
 private:
     void retranslateUi();