fix(ui/modules/Linphone/Chat/Chat): block at each scroll

tests/src/components/chat/ChatProxyModel.cpp

@@ -25,7 +25,7 @@ void ChatModelFilter::setEntryTypeFilter (ChatModel::EntryType type) {
 
 // ===================================================================
 
-const unsigned int ChatProxyModel::ENTRIES_CHUNK_SIZE = 25;
+const unsigned int ChatProxyModel::ENTRIES_CHUNK_SIZE = 50;
 
 ChatProxyModel::ChatProxyModel (QObject *parent) : QSortFilterProxyModel(parent) {
   setSourceModel(&m_chat_model_filter);
@@ -43,8 +43,10 @@ void ChatProxyModel::loadMoreEntries () {
 
     invalidateFilter();
 
-    if (count < rowCount())
-      emit moreEntriesLoaded();
+    count = rowCount() - count;
+
+    if (count > 0)
+      emit moreEntriesLoaded(count);
   }
 }
 

tests/src/components/chat/ChatProxyModel.hpp

@@ -42,7 +42,7 @@ class ChatProxyModel : public QSortFilterProxyModel {
 
 signals:
   void sipAddressChanged (const QString &sipAddress);
-  void moreEntriesLoaded ();
+  void moreEntriesLoaded (int n);
   void entryTypeFilterChanged (ChatModel::EntryType type);
 
 public:

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

@@ -15,10 +15,6 @@ 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: 25
-
   // -----------------------------------------------------------------
 
   spacing: 0
@@ -28,12 +24,10 @@ ColumnLayout {
 
     property bool _tryToLoadMoreEntries: true
 
-    function _loadMoreEntries (force) {
-      if ((
-        chat.visibleArea.yPosition * chat.height <= _loadMoreEntriesAtPosition &&
-        !_tryToLoadMoreEntries
-      ) || force) {
+    function _loadMoreEntries () {
+      if (atYBeginning && !_tryToLoadMoreEntries) {
         _tryToLoadMoreEntries = true
+        positionViewAtIndex(0, ListView.Beginning)
         proxyModel.loadMoreEntries()
       }
     }
@@ -189,16 +183,9 @@ ColumnLayout {
       }
 
       // Received only if more entries was loaded.
-      proxyModel.moreEntriesLoaded.connect(function () {
-        if (ScrollBar.vertical.pressed && atYBeginning) {
-          // Use a timeout to not increase call stack.
-          Utils.setTimeout(chat, 0, function () {
-            _loadMoreEntries(true)
-            positionViewAtIndex(1, ListView.Beginning)
-          })
-        } else {
+      proxyModel.moreEntriesLoaded.connect(function (n) {
+        positionViewAtIndex(n - 1, ListView.Beginning)
         _tryToLoadMoreEntries = false
-        }
       })
 
       // When the view is changed (for example `Calls` -> `Messages`),