Qt: Implement missing settings

Source/Core/DolphinQt2/HotkeyScheduler.cpp

@@ -159,18 +159,18 @@ void HotkeyScheduler::Run()
       if (IsHotkey(HK_EXIT))
         emit ExitHotkey();
 
+      auto& settings = Settings::Instance();
+
       // Volume
       if (IsHotkey(HK_VOLUME_DOWN))
-        AudioCommon::DecreaseVolume(3);
+        settings.DecreaseVolume(3);
 
       if (IsHotkey(HK_VOLUME_UP))
-        AudioCommon::IncreaseVolume(3);
+        settings.IncreaseVolume(3);
 
       if (IsHotkey(HK_VOLUME_TOGGLE_MUTE))
         AudioCommon::ToggleMuteVolume();
 
-      auto& settings = Settings::Instance();
-
       // Wiimote
       if (settings.IsBluetoothPassthroughEnabled())
       {

Source/Core/DolphinQt2/Settings.cpp

@@ -5,6 +5,7 @@
 #include <QDir>
 #include <QSize>
 
+#include "AudioCommon/AudioCommon.h"
 #include "Common/FileSearch.h"
 #include "Common/FileUtil.h"
 #include "Common/StringUtil.h"
@@ -230,6 +231,32 @@ bool Settings::GetHideCursor() const
   return SConfig::GetInstance().bHideCursor;
 }
 
+int Settings::GetVolume() const
+{
+  return SConfig::GetInstance().m_Volume;
+}
+
+void Settings::SetVolume(int volume)
+{
+  if (GetVolume() != volume)
+  {
+    SConfig::GetInstance().m_Volume = volume;
+    emit VolumeChanged(volume);
+  }
+}
+
+void Settings::IncreaseVolume(int volume)
+{
+  AudioCommon::IncreaseVolume(volume);
+  emit VolumeChanged(GetVolume());
+}
+
+void Settings::DecreaseVolume(int volume)
+{
+  AudioCommon::DecreaseVolume(volume);
+  emit VolumeChanged(GetVolume());
+}
+
 bool& Settings::BannerVisible() const
 {
   return SConfig::GetInstance().m_showBannerColumn;

Source/Core/DolphinQt2/Settings.h

@@ -75,6 +75,12 @@ public:
   void SetHideCursor(bool hide_cursor);
   bool GetHideCursor() const;
 
+  // Audio
+  int GetVolume() const;
+  void SetVolume(int volume);
+  void IncreaseVolume(int volume);
+  void DecreaseVolume(int volume);
+
   // Columns
   bool& BannerVisible() const;
   bool& CountryVisible() const;
@@ -116,6 +122,7 @@ signals:
   void PathAdded(const QString&);
   void PathRemoved(const QString&);
   void HideCursorChanged();
+  void VolumeChanged(int volume);
 
 private:
   Settings();