feat: voice playback delay compensation + waveform click-to-seek

tools/chatgui/src/messagedelegate.cpp

@@ -71,15 +71,58 @@ bool MessageDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
 
     QMouseEvent* me = static_cast<QMouseEvent*>(event);
     QPoint localPos = me->pos() - option.rect.topLeft();
-    if (!L.voicePlayBtnRect.contains(localPos)) return false;
+
+    bool onPlayBtn = L.voicePlayBtnRect.contains(localPos);
+    bool onWaveform = L.voiceWaveformRect.contains(localPos);
+    if (!onPlayBtn && !onWaveform) return false;
 
     QString filePath = index.data(MsgVoiceFileRole).toString();
-    GUI_DEBUG("editorEvent voice click: filePath=%s exists=%d",
-              qPrintable(filePath), QFile::exists(filePath));
+    GUI_DEBUG("editorEvent voice click: filePath=%s exists=%d wave=%d",
+              qPrintable(filePath), QFile::exists(filePath), (int)onWaveform);
     if (filePath.isEmpty()) return false;
 
     ensureVoiceTimer();
     VoicePlayState& st = s_voiceStates[filePath];
+
+    QString durStr = index.data(MsgVoiceDurationRole).toString();
+    durStr.remove('s');
+    float dur = durStr.toFloat();
+    if (dur <= 0) dur = 1.0f;
+
+    if (onWaveform) {
+        float clickFrac = (float)(localPos.x() - L.voiceWaveformRect.x()) / L.voiceWaveformRect.width();
+        if (clickFrac < 0) clickFrac = 0; if (clickFrac > 1) clickFrac = 1;
+        float targetSec = clickFrac * dur;
+        qint64 now = QDateTime::currentMSecsSinceEpoch();
+
+        if (!st.playing && !st.paused) {
+            /* Start playback then seek */
+            st.playing = true;
+            st.paused = false;
+            st.durationSec = dur;
+            st.startMs = now - (qint64)(targetSec * 1000.0);
+            st.pausedPosSec = targetSec;
+            VoicePlayer::playOpusFile(filePath);
+            int sr = SoundManager::instance()->currentPcmSampleRate();
+            if (sr > 0)
+                SoundManager::instance()->seekCurrentPcm((unsigned long long)(targetSec * sr));
+            s_voiceTimer->start();
+            model->setData(index, 1, MsgVoicePlayStateRole);
+        } else {
+            /* Currently playing or paused — seek */
+            st.startMs = now - (qint64)(targetSec * 1000.0);
+            if (st.paused)
+                st.pausedPosSec = targetSec;
+            else if (!st.playing)
+                { st.playing = true; s_voiceTimer->start(); }
+            int sr = SoundManager::instance()->currentPcmSampleRate();
+            if (sr > 0)
+                SoundManager::instance()->seekCurrentPcm((unsigned long long)(targetSec * sr));
+        }
+        return true;
+    }
+
+    /* --- Play button click (original logic) --- */
     bool isOtherPlaying = false;
     for (auto it = s_voiceStates.begin(); it != s_voiceStates.end(); ++it) {
         if (it.key() != filePath && (it->playing || it->paused))
@@ -117,11 +160,6 @@ bool MessageDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
         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;
@@ -633,7 +671,11 @@ void MessageDelegate::paint(QPainter *painter, const QStyleOptionViewItem &optio
             elapsed = (now - st.startMs) / 1000.0f;
             if (elapsed > durSec) elapsed = durSec;
         }
-        if (durSec > 0) frac = elapsed / durSec;
+        if (durSec > 0) {
+            float dispElapsed = elapsed - 0.2f; /* 200ms audio output delay */
+            if (dispElapsed < 0) dispElapsed = 0;
+            frac = dispElapsed / durSec;
+        }
         if (frac < 0) frac = 0; if (frac > 1) frac = 1;
 
         QRectF playR = L.voicePlayBtnRect;