feat: edit function "Load chat history"

src/widget/form/genericchatform.cpp

@@ -811,12 +811,22 @@ void GenericChatForm::onLoadHistory()
 {
     LoadHistoryDialog dlg(&chatLog);
     if (dlg.exec()) {
-        QDateTime time = dlg.getFromDate();
-        auto idx = firstItemAfterDate(dlg.getFromDate().date(), chatLog);
-        auto end = ChatLogIdx(idx.get() + 100);
         chatWidget->clear();
         messages.clear();
-        renderMessages(idx, end);
+
+        QDateTime time = dlg.getFromDate();
+        auto type = dlg.getLoadType();
+
+        auto begin = firstItemAfterDate(dlg.getFromDate().date(), chatLog);
+        auto end = ChatLogIdx(begin.get() + 1);
+
+        renderMessages(begin, end);
+
+        if (type == LoadHistoryDialog::from) {
+            loadHistoryUpper();
+        } else {
+            loadHistoryLower();
+        }
     }
 }
 
@@ -986,15 +996,13 @@ void GenericChatForm::renderMessages(ChatLogIdx begin, ChatLogIdx end,
 
 void GenericChatForm::loadHistoryLower()
 {
-    auto begin = messages.begin()->first;
+    auto end = messages.begin()->first;
-
+    auto begin = ChatLogIdx(0);
-    if (begin.get() > 100) {
+    if (end.get() > 100) {
-        begin = ChatLogIdx(begin.get() - 100);
+        begin = ChatLogIdx(end.get() - 100);
-    } else {
-        begin = ChatLogIdx(0);
     }
 
-    renderMessages(begin, chatLog.getNextIdx());
+    renderMessages(begin, end);
 }
 
 void GenericChatForm::loadHistoryUpper()

src/widget/form/loadhistorydialog.cpp

@@ -62,6 +62,15 @@ QDateTime LoadHistoryDialog::getFromDate()
     return res;
 }
 
+LoadHistoryDialog::LoadType LoadHistoryDialog::getLoadType()
+{
+    if (ui->loadTypeComboBox->currentIndex() == 0) {
+        return LoadType::from;
+    }
+
+    return LoadType::to;
+}
+
 void LoadHistoryDialog::setTitle(const QString& title)
 {
     setWindowTitle(title);

src/widget/form/loadhistorydialog.h

@@ -34,11 +34,17 @@ class LoadHistoryDialog : public QDialog
     Q_OBJECT
 
 public:
+    enum LoadType {
+        from,
+        to
+    };
+
     explicit LoadHistoryDialog(const IChatLog* chatLog, QWidget* parent = nullptr);
     explicit LoadHistoryDialog(QWidget* parent = nullptr);
     ~LoadHistoryDialog();
 
     QDateTime getFromDate();
+    LoadType getLoadType();
     void setTitle(const QString& title);
     void setInfoLabel(const QString& info);
 

src/widget/form/loadhistorydialog.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>347</width>
+    <width>410</width>
-    <height>264</height>
+    <height>332</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -16,22 +16,60 @@
   <property name="modal">
    <bool>true</bool>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout_3">
+  <layout class="QFormLayout" name="formLayout">
+   <item row="0" column="0">
+    <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
       <widget class="QLabel" name="fromLabel">
        <property name="text">
-      <string>Load history from:</string>
+        <string>Load history</string>
        </property>
       </widget>
      </item>
      <item>
+      <widget class="QComboBox" name="loadTypeComboBox">
+       <item>
+        <property name="text">
+         <string>from</string>
+        </property>
+       </item>
+       <item>
+        <property name="text">
+         <string>to</string>
+        </property>
+       </item>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>(about 100 messages are loaded)</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>17</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
+   <item row="1" column="0">
     <widget class="QCalendarWidget" name="fromDate">
      <property name="gridVisible">
       <bool>false</bool>
      </property>
     </widget>
    </item>
-   <item>
+   <item row="2" column="0">
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">
       <enum>Qt::Horizontal</enum>