AudioPluginHost: Allow Audio IO window to display different channel layouts with matching channel counts

extras/AudioPluginHost/Source/Plugins/IOConfigurationWindow.cpp

@@ -171,7 +171,6 @@ private:
 
 //==============================================================================
 class IOConfigurationWindow::InputOutputConfig  : public Component,
-                                                  private ComboBox::Listener,
                                                   private Button::Listener,
                                                   private NumberedBoxes::Listener
 {
@@ -187,7 +186,6 @@ public:
         layoutLabel.setFont (layoutLabel.getFont().withStyle (Font::bold));
         enabledToggle.setClickingTogglesState (true);
 
-        layouts.addListener (this);
         enabledToggle.addListener (this);
 
         addAndMakeVisible (layoutLabel);
@@ -262,26 +260,32 @@ private:
             {
                 name.setText (bus->getName(), NotificationType::dontSendNotification);
 
-                int i;
-                for (i = 1; i < AudioChannelSet::maxChannelsOfNamedLayout; ++i)
-                    if ((layouts.indexOfItemId(i) == -1) != bus->supportedLayoutWithChannels (i).isDisabled())
-                        break;
-
                 // supported layouts have changed
-                if (i < AudioChannelSet::maxChannelsOfNamedLayout)
-                {
-                    layouts.clear();
+                layouts.clear (dontSendNotification);
+                auto* menu = layouts.getRootMenu();
+
+                auto itemId = 1;
+                auto selectedId = -1;
 
-                    for (i = 1; i < AudioChannelSet::maxChannelsOfNamedLayout; ++i)
+                for (auto i = 1; i < AudioChannelSet::maxChannelsOfNamedLayout; ++i)
+                {
+                    for (const auto& set : AudioChannelSet::channelSetsWithNumberOfChannels (i))
                     {
-                        auto set = bus->supportedLayoutWithChannels (i);
+                        if (bus->isLayoutSupported (set))
+                        {
+                            menu->addItem (PopupMenu::Item { set.getDescription() }
+                                               .setAction ([this, set] { applyBusLayout (set); })
+                                               .setID (itemId));
+                        }
 
-                        if (! set.isDisabled())
-                            layouts.addItem (set.getDescription(), i);
+                        if (bus->getCurrentLayout() == set)
+                            selectedId = itemId;
+
+                        ++itemId;
                     }
                 }
 
-                layouts.setSelectedId (bus->getLastEnabledLayout().size());
+                layouts.setSelectedId (selectedId);
 
                 const bool canBeDisabled = bus->isNumberOfChannelsSupported (0);
 
@@ -294,27 +298,18 @@ private:
     }
 
     //==============================================================================
-    void comboBoxChanged (ComboBox* combo) override
+    void applyBusLayout (const AudioChannelSet& set)
     {
-        if (combo == &layouts)
+        if (auto* p = owner.getAudioProcessor())
         {
-            if (auto* p = owner.getAudioProcessor())
+            if (auto* bus = p->getBus (isInput, currentBus))
             {
-                if (auto* bus = p->getBus (isInput, currentBus))
+                if (bus->setCurrentLayoutWithoutEnabling (set))
                 {
-                    auto selectedNumChannels = layouts.getSelectedId();
-
-                    if (selectedNumChannels != bus->getLastEnabledLayout().size())
-                    {
-                        if (isPositiveAndBelow (selectedNumChannels, AudioChannelSet::maxChannelsOfNamedLayout)
-                             && bus->setCurrentLayoutWithoutEnabling (bus->supportedLayoutWithChannels (selectedNumChannels)))
-                        {
-                            if (auto* config = owner.getConfig (! isInput))
-                                config->updateBusLayout();
+                    if (auto* config = owner.getConfig (! isInput))
+                        config->updateBusLayout();
 
-                            owner.update();
-                        }
-                    }
+                    owner.update();
                 }
             }
         }