chatgui: add scroll-to-bottom floating button, incremental message refresh via getMessagesSince

tools/chatgui/db/db_manager.cpp

@@ -8,6 +8,17 @@
 
 /* ── helpers ── */
 
+static QByteArray parseJsonField(const QByteArray& json, const char* key) {
+    QByteArray pat = "\"" + QByteArray(key) + "\":\"";
+    int idx = json.indexOf(pat);
+    if (idx < 0) return {};
+    idx += pat.size();
+    int end = idx;
+    while (end < json.size() && !(json[end] == '"' && (end == idx || json[end - 1] != '\\'))) end++;
+    if (end > idx) return QByteArray(json.constData() + idx, end - idx);
+    return {};
+}
+
 QString DbManager::sanitizeTableName(const QString& chId) {
     QString s;
     s.reserve(chId.size());
@@ -136,17 +147,6 @@ QList<MessageRow> DbManager::getMessages(const QString& chId, int limit) const {
     sqlite3_stmt* stmt = prepareOrNull(sql.toUtf8().constData());
     if (!stmt) return list;
     sqlite3_bind_int(stmt, 1, limit);
-    /* helper: parse JSON field from data column: {"n":<id>,"ch":"<id>","ct":"<>","d":"<>"} */
-    auto parseJsonField = [](const QByteArray& json, const char* key) -> QByteArray {
-        QByteArray pat = "\"" + QByteArray(key) + "\":\"";
-        int idx = json.indexOf(pat);
-        if (idx < 0) return {};
-        idx += pat.size();
-        int end = idx;
-        while (end < json.size() && !(json[end] == '"' && (end == idx || json[end - 1] != '\\'))) end++;
-        if (end > idx) return QByteArray(json.constData() + idx, end - idx);
-        return {};
-    };
     uint64_t myId = 0;
     { sqlite3_stmt* ms = prepareOrNull("SELECT node_id FROM local_identity WHERE id=1");
       if (ms) { if (sqlite3_step(ms) == SQLITE_ROW) myId = (uint64_t)sqlite3_column_int64(ms, 0); sqlite3_finalize(ms); } }
@@ -170,6 +170,33 @@ QList<MessageRow> DbManager::getMessages(const QString& chId, int limit) const {
     return list;
 }
 
+QList<MessageRow> DbManager::getMessagesSince(const QString& chId, qint64 sinceId) const {
+    QList<MessageRow> list;
+    QString sql = QStringLiteral(
+        "SELECT id, node_id, data, timestamp, chain_hash, author_signature"
+        " FROM \"%1\" WHERE id > ? ORDER BY id ASC").arg(msgTableName(chId));
+    sqlite3_stmt* stmt = prepareOrNull(sql.toUtf8().constData());
+    if (!stmt) return list;
+    sqlite3_bind_int64(stmt, 1, sinceId);
+    uint64_t myId = m_myNodeId;
+    while (sqlite3_step(stmt) == SQLITE_ROW) {
+        MessageRow m;
+        m.id           = sqlite3_column_int64(stmt, 0);
+        m.authorNodeId = (quint64)sqlite3_column_int64(stmt, 1);
+        QByteArray jdata = colBlob(stmt, 2);
+        m.data         = parseJsonField(jdata, "d");
+        m.timestamp    = sqlite3_column_int64(stmt, 3);
+        m.datahash     = 0;
+        m.chainHash    = colBlob(stmt, 4);
+        m.signature    = colBlob(stmt, 5);
+        m.isOutgoing   = (m.authorNodeId == myId);
+        m.isRead       = true;
+        list.append(m);
+    }
+    sqlite3_finalize(stmt);
+    return list;
+}
+
 /* ── peers (UI) ── */
 
 int DbManager::getChannelMemberCount(const QString& chId) const {

tools/chatgui/db/db_manager.h

@@ -89,6 +89,7 @@ public:
 
     /* ── Сообщения (UI) ── */
     QList<MessageRow> getMessages(const QString& chId, int limit = 50) const;
+    QList<MessageRow> getMessagesSince(const QString& chId, qint64 sinceId) const;
 
     /* ── Участники канала (UI) ── */
     int  getChannelMemberCount(const QString& chId) const;

tools/chatgui/src/chatview.cpp

@@ -6,11 +6,38 @@
 #include <QDebug>
 #include <QMouseEvent>
 #include <QKeyEvent>
+#include <QScrollBar>
 
 ChatView::ChatView(QWidget *parent)
     : QListView(parent)
 {
     setMouseTracking(true);
+
+    m_scrollDownBtn = new QPushButton(QStringLiteral("\u25BC"), this);
+    m_scrollDownBtn->setFixedSize(36, 36);
+    m_scrollDownBtn->setCursor(Qt::PointingHandCursor);
+    m_scrollDownBtn->setStyleSheet(
+        "QPushButton {"
+        "  background: rgba(60,60,60,180);"
+        "  color: #ffffff;"
+        "  border: none;"
+        "  border-radius: 18px;"
+        "  font-size: 16px;"
+        "}"
+        "QPushButton:hover {"
+        "  background: rgba(90,90,90,220);"
+        "}"
+    );
+    m_scrollDownBtn->setToolTip(tr("Scroll to bottom"));
+    m_scrollDownBtn->setVisible(false);
+
+    connect(m_scrollDownBtn, &QPushButton::clicked, this, [this]() {
+        scrollToBottom();
+    });
+    connect(verticalScrollBar(), &QScrollBar::valueChanged, this, &ChatView::updateScrollDownBtn);
+    connect(verticalScrollBar(), &QScrollBar::rangeChanged, this, &ChatView::updateScrollDownBtn);
+
+    m_scrollDownBtn->raise();
 }
 
 void ChatView::setBackgroundImage(const QString &path) {
@@ -24,6 +51,7 @@ void ChatView::setBackgroundImage(const QString &path) {
 void ChatView::resizeEvent(QResizeEvent *event) {
     QListView::resizeEvent(event);
     scheduleDelayedItemsLayout();
+    updateScrollDownBtn();
 }
 
 void ChatView::scrollContentsBy(int dx, int dy) {
@@ -150,3 +178,14 @@ void ChatView::copySelection() {
         QApplication::clipboard()->setText(r);
     }
 }
+
+void ChatView::updateScrollDownBtn() {
+    QScrollBar* sb = verticalScrollBar();
+    bool atBottom = sb && (sb->value() >= sb->maximum());
+    m_scrollDownBtn->setVisible(!atBottom);
+    if (!atBottom) {
+        QRect vr = viewport()->geometry();
+        m_scrollDownBtn->move(vr.right() - 44, vr.bottom() - 44);
+        m_scrollDownBtn->raise();
+    }
+}

tools/chatgui/src/chatview.h

@@ -3,6 +3,7 @@
 #include <QListView>
 #include <QPersistentModelIndex>
 #include <QPoint>
+#include <QPushButton>
 
 struct ChatTextSelection {
     QPersistentModelIndex index;
@@ -43,6 +44,7 @@ protected:
 
 private:
     void copySelection();
+    void updateScrollDownBtn();
 
     QPixmap m_background;
     QPersistentModelIndex m_selStart;
@@ -52,4 +54,5 @@ private:
     QPersistentModelIndex m_pressIndex;
     QPoint m_pressPos;
     bool m_selecting = false;
+    QPushButton *m_scrollDownBtn = nullptr;
 };

tools/chatgui/src/messagelist.cpp

@@ -250,8 +250,39 @@ void MessageList::loadChannel(const QString& channelId) {
 }
 
 void MessageList::refresh() {
-    if (!m_currentChannelId.isEmpty())
-        loadChannel(m_currentChannelId);
+    if (m_currentChannelId.isEmpty() || !m_db || !m_db->isOpen()) return;
+
+    qint64 maxId = 0;
+    for (int r = 0; r < m_model->rowCount(); r++)
+        if (m_model->item(r)->data(MsgIdRole).toLongLong() > maxId)
+            maxId = m_model->item(r)->data(MsgIdRole).toLongLong();
+
+    auto newMsgs = m_db->getMessagesSince(m_currentChannelId, maxId);
+    if (newMsgs.isEmpty()) return;
+
+    QScrollBar* sb = m_view->verticalScrollBar();
+    bool wasAtBottom = sb && (sb->value() >= sb->maximum());
+
+    for (const auto& m : newMsgs) {
+        AccountRow acc = m_db->getAccount(m.authorNodeId);
+        QString author  = m_db->getDisplayName(m.authorNodeId);
+        QString letter  = acc.avatarLetter.isEmpty() ? author.mid(0, 1) : acc.avatarLetter;
+        QColor  color(acc.avatarColor);
+        if (!m_avatarCache.contains(m.authorNodeId))
+            m_avatarCache[m.authorNodeId] = color;
+        auto avatar = makeAvatar(color, letter);
+        auto time   = QDateTime::fromMSecsSinceEpoch(m.timestamp).toString("HH:mm");
+        auto *item = new QStandardItem();
+        setMsg(item, author, QString::fromUtf8(m.data), time, avatar, false,
+               false, QString(), QString(), QVariantList{});
+        item->setData(m.id, MsgIdRole);
+        m_model->appendRow(item);
+        while (m_model->rowCount() > 100)
+            m_model->removeRow(0);
+    }
+
+    if (wasAtBottom) m_view->scrollToBottom();
+    m_readDebounce->start();
 }
 
 void MessageList::addMessage(const QString& channelId, quint64 authorNodeId,

tools/chatgui/transport/chat_msg.c

@@ -59,9 +59,6 @@ void chat_core_submit_message(struct chat_msg_submit* req) {
         DEBUG_ERROR(DEBUG_CATEGORY_CONNECTIVITY, "%s: db_sync_insert_signed failed ret=%d", CC_ID, ret);
         return;
     }
-    { uint8_t evt[73]; uint8_t cl=(uint8_t)strlen(req->channel_id); evt[0]=cl; memcpy(evt+1,req->channel_id,cl);
-      memcpy(evt+1+cl, &g_cc.my_node_id, 8);
-      gui_bridge_post(GUI_EVT_MSG_RECEIVED, evt, 1+cl+8); }
 }
 
 void chat_core_submit_trampoline(void* arg) { chat_core_submit_message((struct chat_msg_submit*)arg); u_free(arg); }