Avoid hotcue buttons from being stucked in the pressed state

src/engine/controls/cuecontrol.cpp

@@ -769,8 +769,13 @@ void CueControl::hotcueGotoAndStop(HotcueControl* pControl, double value) {
     if (pCue) {
         double position = pCue->getPosition();
         if (position != Cue::kNoPosition) {
-            m_pPlay->set(0.0);
-            seekExact(position);
+            if (!m_iCurrentlyPreviewingHotcues && !m_bPreviewing) {
+                m_pPlay->set(0.0);
+                seekExact(position);
+            } else {
+                // this becomes a play latch command if we are previewing
+                m_pPlay->set(0.0);
+            }
         }
     }
 }
@@ -861,7 +866,7 @@ void CueControl::hotcueActivatePreview(HotcueControl* pControl, double value) {
     CuePointer pCue(pControl->getCue());
 
     if (value > 0) {
-        if (pCue && pCue->getPosition() != Cue::kNoPosition) {
+        if (pCue && pCue->getPosition() != Cue::kNoPosition && !pControl->isPreviewing()) {
             m_iCurrentlyPreviewingHotcues++;
             double position = pCue->getPosition();
             m_bypassCueSetByPlay = true;
@@ -1026,23 +1031,26 @@ void CueControl::cueGotoAndStop(double value) {
         return;
     }
 
-    QMutexLocker lock(&m_mutex);
-    m_pPlay->set(0.0);
-    double cuePoint = m_pCuePoint->get();
-
-    // Need to unlock before emitting any signals to prevent deadlock.
-    lock.unlock();
-
-    seekExact(cuePoint);
+    if (!m_iCurrentlyPreviewingHotcues && !m_bPreviewing) {
+        m_pPlay->set(0.0);
+        double position = m_pCuePoint->get();
+        seekExact(position);
+    } else {
+        // this becomes a play latch command if we are previewing
+        m_pPlay->set(0.0);
+    }
 }
 
 void CueControl::cuePreview(double value) {
+    //qDebug() << "CueControl::cuePreview" << value;
     QMutexLocker lock(&m_mutex);
 
     if (value > 0) {
-        m_bPreviewing = true;
-        m_bypassCueSetByPlay = true;
-        m_pPlay->set(1.0);
+        if (!m_bPreviewing) {
+            m_bPreviewing = true;
+            m_bypassCueSetByPlay = true;
+            m_pPlay->set(1.0);
+        }
     } else if (m_bPreviewing) {
         m_bPreviewing = false;
         if (m_iCurrentlyPreviewingHotcues) {
@@ -1071,7 +1079,10 @@ void CueControl::cueCDJ(double value) {
     TrackAt trackAt = getTrackAt();
 
     if (value > 0) {
-        if (m_iCurrentlyPreviewingHotcues) {
+        if (m_bPreviewing) {
+            // already previewing, do nothing
+            return;
+        } else if (m_iCurrentlyPreviewingHotcues) {
             // we are already previewing by hotcues
             // just jump to cue point and continue previewing
             m_bPreviewing = true;
@@ -1095,9 +1106,6 @@ void CueControl::cueCDJ(double value) {
         } else {
             // Pause not at cue point and not at end position
             cueSet(value);
-            // Just in case.
-            m_bPreviewing = false;
-            m_pPlay->set(0.0);
 
             // If quantize is enabled, jump to the cue point since it's not
             // necessarily where we currently are
@@ -1138,7 +1146,10 @@ void CueControl::cueDenon(double value) {
     TrackAt trackAt = getTrackAt();
 
     if (value > 0) {
-        if (m_iCurrentlyPreviewingHotcues) {
+        if (m_bPreviewing) {
+            // already previewing, do nothing
+            return;
+        } else if (m_iCurrentlyPreviewingHotcues) {
             // we are already previewing by hotcues
             // just jump to cue point and continue previewing
             m_bPreviewing = true;
@@ -1149,13 +1160,8 @@ void CueControl::cueDenon(double value) {
             m_bPreviewing = true;
             m_pPlay->set(1.0);
         } else {
-            // Just in case.
-            m_bPreviewing = false;
-            m_pPlay->set(0.0);
-
             // Need to unlock before emitting any signals to prevent deadlock.
             lock.unlock();
-
             seekAbs(m_pCuePoint->get());
         }
     } else if (m_bPreviewing) {

src/skin/tooltips.cpp

@@ -468,16 +468,19 @@ void Tooltips::addStandardTooltips() {
 
     QString whilePlaying = tr("(while playing)");
     QString whileStopped = tr("(while stopped)");
+    QString whilePreviewing = tr("(while previewing)");
     QString cueSet = tr("Places a cue point at the current position on the waveform.");
     QString cueWhilePlaying = tr("Stops track at cue point, OR go to cue point and play after release (CUP mode).");
     QString cueWhileStopped = tr("Set cue point (Pioneer/Mixxx/Numark mode), set cue point and play after release (CUP mode) "
             "OR preview from it (Denon mode).");
     QString cueHint = tr("Hint: Change the default cue mode in Preferences -> Interface.");
+    QString latchingPlay = tr("Is latching the playing state.");
 
     // Currently used for decks
     add("play_cue_set")
             << tr("Play/Pause")
             << QString("%1: %2").arg(leftClick, tr("Plays or pauses the track."))
+            << QString("%1 %2: %3").arg(leftClick, whilePreviewing, latchingPlay)
             << QString("%1: %2").arg(rightClick, cueSet);
 
     // Currently used for minimal decks
@@ -494,7 +497,8 @@ void Tooltips::addStandardTooltips() {
             << QString("%1 %2: %3").arg(leftClick, whileStopped, cueWhileStopped)
             << cueHint
             << quantizeSnap
-            << QString("%1: %2").arg(rightClick, tr("Seeks the track to the cue point and stops."));
+            << QString("%1: %2").arg(rightClick, tr("Seeks the track to the cue point and stops."))
+            << QString("%1 %2: %3").arg(rightClick, whilePreviewing, latchingPlay);
     add("cue_gotoandplay_cue_default")
             << tr("Play")
             << QString("%1: %2").arg(leftClick, tr("Plays track from the cue point."))

src/widget/whotcuebutton.cpp

@@ -83,6 +83,12 @@ void WHotcueButton::setup(const QDomNode& node, const SkinContext& context) {
 void WHotcueButton::mousePressEvent(QMouseEvent* e) {
     const bool rightClick = e->button() == Qt::RightButton;
     if (rightClick) {
+        if (isPressed()) {
+            // Discard right clicks when already left clicked.
+            // Otherwise the pop up menu receives the release event and the
+            // button stucks in the pressed stage.
+            return;
+        }
         if (readDisplayValue() == 1) {
             // hot cue is set
             TrackPointer pTrack = PlayerInfo::instance().getTrackInfo(m_group);
@@ -116,6 +122,15 @@ void WHotcueButton::mousePressEvent(QMouseEvent* e) {
     WPushButton::mousePressEvent(e);
 }
 
+void WHotcueButton::mouseReleaseEvent(QMouseEvent* e) {
+    const bool rightClick = e->button() == Qt::RightButton;
+    if (rightClick) {
+        // Don't handle stray release events
+        return;
+    }
+    WPushButton::mouseReleaseEvent(e);
+}
+
 ConfigKey WHotcueButton::createConfigKey(const QString& name) {
     ConfigKey key;
     key.group = m_group;

src/widget/whotcuebutton.h

@@ -21,6 +21,7 @@ class WHotcueButton : public WPushButton {
 
   protected:
     void mousePressEvent(QMouseEvent* e) override;
+    void mouseReleaseEvent(QMouseEvent* e) override;
     void restyleAndRepaint() override;
 
   private slots:

src/widget/wpushbutton.cpp

@@ -439,6 +439,20 @@ bool WPushButton::event(QEvent* e) {
         m_bHovered = true;
         restyleAndRepaint();
     } else if (e->type() == QEvent::Leave) {
+        if (m_bPressed) {
+            // A Leave event is send instead of a mouseReleaseEvent()
+            // fake it to get not stucked in pressed state
+            QMouseEvent mouseEvent = QMouseEvent(
+                    QEvent::MouseButtonRelease,
+                    QPointF(),
+                    QPointF(),
+                    QPointF(),
+                    Qt::LeftButton,
+                    Qt::NoButton,
+                    0,
+                    Qt::MouseEventSynthesizedByApplication);
+            mouseReleaseEvent(&mouseEvent);
+        }
         m_bHovered = false;
         restyleAndRepaint();
     }