refs #892, disable audio settings when no audio context is available

* Info for which machine audio setup is displayed
* Obtain audio "location"
* Remark: Audio can run on core and in GUI which is different from other contexts

src/blackgui/components/audiosetupcomponent.cpp

@@ -39,14 +39,35 @@ namespace BlackGui
         {
             ui->setupUi(this);
 
+            Q_ASSERT_X(sGui, Q_FUNC_INFO, "Missing sGui");
+            Q_ASSERT_X(sGui->getIContextAudio(), Q_FUNC_INFO, "Missing Audio context");
+
+            // audio is optional
+            const bool audio = this->hasAudio();
+            this->setEnabled(audio);
+            if (!audio)
+            {
+                ui->lbl_ExtraInfo->setText("No audio, cannot change.");
+            }
+            else if (sGui->getIContextAudio()->isUsingImplementingObject())
+            {
+                const CIdentifier i = sGui->getIContextAudio()->audioRunsWhere();
+                const QString info = QString("Local audio on '%1', '%2'.").arg(i.getMachineName(), i.getProcessName());
+                ui->lbl_ExtraInfo->setText(info);
+            }
+            else
+            {
+                const CIdentifier i = sGui->getIContextAudio()->audioRunsWhere();
+                const QString info = QString("Remote audio on '%1', '%2'.").arg(i.getMachineName(), i.getProcessName());
+                ui->lbl_ExtraInfo->setText(info);
+            }
+
             bool c = connect(ui->tb_ExpandNotificationSounds, &QToolButton::toggled, this, &CAudioSetupComponent::ps_onToggleNotificationSoundsVisibility);
             Q_ASSERT(c);
-            Q_UNUSED(c);
             c = connect(ui->cb_SetupAudioLoopback, &QCheckBox::toggled, this, &CAudioSetupComponent::ps_onLoopbackToggled);
             Q_ASSERT(c);
-            Q_UNUSED(c);
 
-            if (sGui->getIContextAudio())
+            if (audio)
             {
                 this->initAudioDeviceLists();
 
@@ -56,18 +77,18 @@ namespace BlackGui
                 // the connects depend on initAudioDeviceLists
                 c = this->connect(ui->cb_SetupAudioInputDevice,  static_cast<void (QComboBox::*)(int)> (&QComboBox::currentIndexChanged), this, &CAudioSetupComponent::ps_audioDeviceSelected);
                 Q_ASSERT(c);
-                Q_UNUSED(c);
-
                 c = this->connect(ui->cb_SetupAudioOutputDevice, static_cast<void (QComboBox::*)(int)> (&QComboBox::currentIndexChanged), this, &CAudioSetupComponent::ps_audioDeviceSelected);
                 Q_ASSERT(c);
-                Q_UNUSED(c);
 
                 // context
-                this->connect(sGui->getIContextAudio(), &IContextAudio::changedAudioDevices, this, &CAudioSetupComponent::ps_onAudioDevicesChanged);
-                this->connect(sGui->getIContextAudio(), &IContextAudio::changedSelectedAudioDevices, this, &CAudioSetupComponent::ps_onCurrentAudioDevicesChanged);
+                c = this->connect(sGui->getIContextAudio(), &IContextAudio::changedAudioDevices, this, &CAudioSetupComponent::ps_onAudioDevicesChanged);
+                Q_ASSERT(c);
+                c = this->connect(sGui->getIContextAudio(), &IContextAudio::changedSelectedAudioDevices, this, &CAudioSetupComponent::ps_onCurrentAudioDevicesChanged);
+                Q_ASSERT(c);
             }
             this->ps_reloadSettings();
             ui->tb_ExpandNotificationSounds->setChecked(false); // collapse
+            Q_UNUSED(c);
         }
 
         CAudioSetupComponent::~CAudioSetupComponent()
@@ -88,11 +109,16 @@ namespace BlackGui
 
         void CAudioSetupComponent::initAudioDeviceLists()
         {
-            if (!sGui->getIContextAudio()) { return; }
+            if (!this->hasAudio()) { return; }
             this->ps_onAudioDevicesChanged(sGui->getIContextAudio()->getAudioDevices());
             this->ps_onCurrentAudioDevicesChanged(sGui->getIContextAudio()->getCurrentAudioDevices());
         }
 
+        bool CAudioSetupComponent::hasAudio() const
+        {
+            return sGui && sGui->getIContextAudio() && !sGui->getIContextAudio()->isEmptyObject();
+        }
+
         bool CAudioSetupComponent::playNotificationSounds() const
         {
             return ui->cb_SetupAudioPlayNotificationSounds->isChecked();
@@ -162,6 +188,5 @@ namespace BlackGui
             if (sGui->getIContextAudio()->isAudioLoopbackEnabled() == loopback) { return; }
             sGui->getIContextAudio()->enableAudioLoopback(loopback);
         }
-
     } // namespace
 } // namespace

src/blackgui/components/audiosetupcomponent.h

@@ -24,7 +24,6 @@
 class QWidget;
 
 namespace Ui { class CAudioSetupComponent; }
-
 namespace BlackGui
 {
     namespace Components
@@ -40,7 +39,7 @@ namespace BlackGui
             explicit CAudioSetupComponent(QWidget *parent = nullptr);
 
             //! Destructor
-            ~CAudioSetupComponent();
+            virtual ~CAudioSetupComponent();
 
             //! Play notification sounds (at all)
             bool playNotificationSounds() const;
@@ -49,10 +48,8 @@ namespace BlackGui
             //! Reload settings
             void ps_reloadSettings();
 
-            /*!
-             * \brief Audio device selected
-             * \param index audio device index (COM1, COM2)
-             */
+            //! Audio device selected
+            //! \param index audio device index (COM1, COM2)
             void ps_audioDeviceSelected(int index);
 
             //! Current audio devices changed
@@ -71,6 +68,9 @@ namespace BlackGui
             //! Audio device lists from settings
             void initAudioDeviceLists();
 
+            //! Audio is optional, check if available
+            bool hasAudio() const;
+
             QScopedPointer<Ui::CAudioSetupComponent> ui;
             BlackMisc::CSetting<BlackCore::Audio::TSettings> m_audioSettings { this, &CAudioSetupComponent::ps_reloadSettings };
 

src/blackgui/components/audiosetupcomponent.ui

@@ -2,6 +2,14 @@
 <ui version="4.0">
  <class>CAudioSetupComponent</class>
  <widget class="QFrame" name="CAudioSetupComponent">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>264</width>
+    <height>359</height>
+   </rect>
+  </property>
   <property name="windowTitle">
    <string>Audio setup</string>
   </property>
@@ -27,6 +35,22 @@
    <property name="bottomMargin">
     <number>2</number>
    </property>
+   <item>
+    <widget class="QWidget" name="wi_ExtraInfo" native="true">
+     <layout class="QVBoxLayout" name="vl_ExtraInfo">
+      <item>
+       <widget class="QLabel" name="lbl_ExtraInfo">
+        <property name="text">
+         <string>Extra info goes here</string>
+        </property>
+        <property name="wordWrap">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
    <item>
     <layout class="QFormLayout" name="fl_SetupAudio">
      <property name="sizeConstraint">
@@ -112,7 +136,7 @@
      <item row="2" column="1">
       <widget class="QCheckBox" name="cb_SetupAudioLoopback">
        <property name="text">
-        <string>Loopback, test sound input to output loop</string>
+        <string>Loopback, test sound in- to output</string>
        </property>
       </widget>
      </item>
@@ -120,6 +144,18 @@
    </item>
    <item>
     <layout class="QGridLayout" name="gl_NotificationSounds">
+     <property name="leftMargin">
+      <number>3</number>
+     </property>
+     <property name="topMargin">
+      <number>3</number>
+     </property>
+     <property name="rightMargin">
+      <number>3</number>
+     </property>
+     <property name="bottomMargin">
+      <number>3</number>
+     </property>
      <item row="0" column="1">
       <widget class="QLabel" name="lbl_NotificationSounds">
        <property name="text">