feat(ui/modules/Linphone): load more entries dynamically

tests/src/components/chat/ChatProxyModel.cpp

 #include "ChatProxyModel.hpp"
 
+// ===================================================================
+
 ChatModelFilter::ChatModelFilter (QObject *parent) : QSortFilterProxyModel(parent) {
   setSourceModel(&m_chat_model);
 }
@@ -30,7 +32,13 @@ ChatProxyModel::ChatProxyModel (QObject *parent) : QSortFilterProxyModel(parent)
 }
 
 void ChatProxyModel::loadMoreEntries () {
-  // TODO.
+  int count = rowCount();
+  m_n_max_displayed_entries += ENTRIES_CHUNK_SIZE;
+
+  invalidateFilter();
+
+  if (count < rowCount())
+    emit moreEntriesLoaded();
 }
 
 void ChatProxyModel::removeEntry (int id) {

tests/src/components/chat/ChatProxyModel.hpp

@@ -9,7 +9,7 @@
 // Fetch the L last filtered chat entries.
 // ===================================================================
 
-// Cannot be used as a nested class by Qt and `Q_OBJECTY` macro
+// Cannot be used as a nested class by Qt and `Q_OBJECT` macro
 // must be used in header c++ file.
 class ChatModelFilter : public QSortFilterProxyModel {
   friend class ChatProxyModel;
@@ -42,6 +42,7 @@ class ChatProxyModel : public QSortFilterProxyModel {
 
 signals:
   void sipAddressChanged (const QString &sipAddress);
+  void moreEntriesLoaded ();
 
 public:
   ChatProxyModel (QObject *parent = Q_NULLPTR);

tests/ui/modules/Linphone/Chat/Chat.qml

@@ -14,6 +14,10 @@ ColumnLayout {
   // Can be a model or a proxy chat model.
   property alias proxyModel: chat.model
 
+  // Set the offset position to load more entries.
+  // Not a style property.
+  property int _loadMoreEntriesAtPosition: 1
+
   // -----------------------------------------------------------------
 
   spacing: 0
@@ -21,17 +25,17 @@ ColumnLayout {
   ScrollableListView {
     id: chat
 
-    property bool _tryToLoadMoreEntries: false
+    property bool _tryToLoadMoreEntries: true
 
     function _loadMoreEntries () {
-      if (chat.contentY > 500 || _tryToLoadMoreEntries) {
-        return
-      }
-
+      if (
+        chat.visibleArea.yPosition * chat.height <= _loadMoreEntriesAtPosition &&
+          !_tryToLoadMoreEntries
+      ) {
         _tryToLoadMoreEntries = true
-
         proxyModel.loadMoreEntries()
       }
+    }
 
     Layout.fillHeight: true
     Layout.fillWidth: true
@@ -178,6 +182,15 @@ ColumnLayout {
     }
 
     onContentYChanged: _loadMoreEntries()
+
+    Component.onCompleted: {
+      positionViewAtEnd()
+      _tryToLoadMoreEntries = false
+
+      proxyModel.moreEntriesLoaded.connect(function () {
+        _tryToLoadMoreEntries = false
+      })
+    }
   }
 
   // -----------------------------------------------------------------