fix: true pause/resume with position preservation

- SoundManager: pauseCurrentPcm()/resumeCurrentPcm() — stop/start without destroy
- VoicePlayState: added paused/pausedPosSec fields
- editorEvent: 3-state logic — playing→pause, paused→resume, stopped→new
- Different file click: stops old with full cleanup, plays new from start
- Timer: skips paused items, full cleanup on auto-complete

tools/chatgui/src/messagedelegate.cpp

@@ -25,8 +25,10 @@ MessageDelegate::MessageDelegate(QObject *parent)
 
 struct VoicePlayState {
     bool playing = false;
+    bool paused = false;
     qint64 startMs = 0;
     float durationSec = 0.0f;
+    float pausedPosSec = 0.0f;
 };
 static QMap<QString, VoicePlayState> s_voiceStates;
 static QTimer* s_voiceTimer = nullptr;
@@ -39,10 +41,13 @@ static void ensureVoiceTimer() {
             bool anyPlaying = false;
             qint64 now = QDateTime::currentMSecsSinceEpoch();
             for (auto it = s_voiceStates.begin(); it != s_voiceStates.end(); ) {
+                if (!it->playing && !it->paused) { ++it; continue; }
+                if (it->paused) { ++it; continue; }
                 if (!it->playing) { ++it; continue; }
                 float elapsed = (now - it->startMs) / 1000.0f;
                 if (elapsed >= it->durationSec && it->durationSec > 0) {
                     it->playing = false;
+                    it->paused = false;
                     SoundManager::instance()->stopCurrentPcm();
                     ++it;
                 } else {
@@ -51,7 +56,6 @@ static void ensureVoiceTimer() {
                 }
             }
             if (!anyPlaying) s_voiceTimer->stop();
-            // Trigger repaint through any visible view
             if (auto* w = QApplication::activeWindow()) w->update();
         });
     }
@@ -75,29 +79,57 @@ bool MessageDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
 
     ensureVoiceTimer();
     VoicePlayState& st = s_voiceStates[filePath];
+    bool isOtherPlaying = false;
+    for (auto it = s_voiceStates.begin(); it != s_voiceStates.end(); ++it) {
+        if (it.key() != filePath && (it->playing || it->paused))
+            isOtherPlaying = true;
+    }
 
     if (st.playing) {
+        /* Playing → Pause */
+        qint64 now = QDateTime::currentMSecsSinceEpoch();
+        st.pausedPosSec = (now - st.startMs) / 1000.0f;
         st.playing = false;
-        SoundManager::instance()->stopCurrentPcm();
-        model->setData(index, 0, MsgVoicePlayStateRole);
-    } else {
-        for (auto it = s_voiceStates.begin(); it != s_voiceStates.end(); ++it)
-            it->playing = false;
-        SoundManager::instance()->stopCurrentPcm();
-
-        QString durStr = index.data(MsgVoiceDurationRole).toString();
-        durStr.remove('s');
-        float dur = durStr.toFloat();
-        if (dur <= 0) dur = 1.0f;
+        st.paused = true;
+        SoundManager::instance()->pauseCurrentPcm();
+        model->setData(index, 2, MsgVoicePlayStateRole);
+        return true;
+    }
 
+    if (st.paused) {
+        /* Paused → Resume */
+        st.paused = false;
         st.playing = true;
-        st.startMs = QDateTime::currentMSecsSinceEpoch();
-        st.durationSec = dur;
-
-        VoicePlayer::playOpusFile(filePath);
+        qint64 now = QDateTime::currentMSecsSinceEpoch();
+        st.startMs = now - (qint64)(st.pausedPosSec * 1000.0);
+        SoundManager::instance()->resumeCurrentPcm();
         s_voiceTimer->start();
         model->setData(index, 1, MsgVoicePlayStateRole);
+        return true;
     }
+
+    /* Stopped or different file → stop old, play new */
+    if (isOtherPlaying) {
+        for (auto it = s_voiceStates.begin(); it != s_voiceStates.end(); ++it) {
+            it->playing = false; it->paused = false;
+        }
+        SoundManager::instance()->stopCurrentPcm();
+    }
+
+    QString durStr = index.data(MsgVoiceDurationRole).toString();
+    durStr.remove('s');
+    float dur = durStr.toFloat();
+    if (dur <= 0) dur = 1.0f;
+
+    st.playing = true;
+    st.paused = false;
+    st.pausedPosSec = 0;
+    st.startMs = QDateTime::currentMSecsSinceEpoch();
+    st.durationSec = dur;
+
+    VoicePlayer::playOpusFile(filePath);
+    s_voiceTimer->start();
+    model->setData(index, 1, MsgVoicePlayStateRole);
     return true;
 }
 
@@ -578,13 +610,14 @@ void MessageDelegate::paint(QPainter *painter, const QStyleOptionViewItem &optio
         }
 
         bool isPlaying = st.playing;
+        bool isPaused = st.paused;
         QRectF playR = L.voicePlayBtnRect;
 
         /* Play/Pause button */
         painter->setPen(Qt::NoPen);
         painter->setBrush(QColor(0x33, 0x90, 0xEC));
 
-        if (isPlaying) {
+        if (isPlaying || isPaused) {
             /* Pause icon (two vertical bars) */
             qreal bw = playR.width() / 5.0;
             qreal gap = playR.width() / 8.0;
@@ -617,10 +650,15 @@ void MessageDelegate::paint(QPainter *painter, const QStyleOptionViewItem &optio
         int pbTop = L.voicePlayBtnRect.bottom() + 6;
         int pbHeight = 3;
 
-        if (isPlaying && st.durationSec > 0) {
-            qint64 now = QDateTime::currentMSecsSinceEpoch();
-            float elapsed = (now - st.startMs) / 1000.0f;
-            if (elapsed > st.durationSec) elapsed = st.durationSec;
+        if ((isPlaying || isPaused) && st.durationSec > 0) {
+            float elapsed;
+            if (isPaused) {
+                elapsed = st.pausedPosSec;
+            } else {
+                qint64 now = QDateTime::currentMSecsSinceEpoch();
+                elapsed = (now - st.startMs) / 1000.0f;
+                if (elapsed > st.durationSec) elapsed = st.durationSec;
+            }
             float frac = elapsed / st.durationSec;
 
             painter->setPen(Qt::NoPen);