GenericAudioProcessorEditor: Update parameter names when AudioProcessor changes

modules/juce_audio_processors/processors/juce_GenericAudioProcessorEditor.cpp

@@ -406,12 +406,16 @@ private:
 };
 
 //==============================================================================
-class ParameterDisplayComponent   : public Component
+class ParameterDisplayComponent   : public Component,
+                                    private AudioProcessorListener,
+                                    private AsyncUpdater
 {
 public:
     ParameterDisplayComponent (AudioProcessorEditor& editorIn, AudioProcessorParameter& param)
         : editor (editorIn), parameter (param)
     {
+        editor.processor.addListener (this);
+
         parameterName.setText (parameter.getName (128), dontSendNotification);
         parameterName.setJustificationType (Justification::centredRight);
         parameterName.setInterceptsMouseClicks (false, false);
@@ -426,6 +430,12 @@ public:
         setSize (400, 40);
     }
 
+    ~ParameterDisplayComponent() override
+    {
+        cancelPendingUpdate();
+        editor.processor.removeListener (this);
+    }
+
     void resized() override
     {
         auto area = getLocalBounds();
@@ -479,6 +489,25 @@ private:
         return std::make_unique<SliderParameterComponent> (processor, parameter);
     }
 
+    void audioProcessorParameterChanged (AudioProcessor*, int, float) override {}
+
+    void audioProcessorChanged (AudioProcessor*, const ChangeDetails& details) override
+    {
+        if (! details.parameterInfoChanged)
+            return;
+
+        if (MessageManager::getInstance()->isThisTheMessageThread())
+            handleAsyncUpdate();
+        else
+            triggerAsyncUpdate();
+    }
+
+    void handleAsyncUpdate() override
+    {
+        parameterName .setText (parameter.getName (128), dontSendNotification);
+        parameterLabel.setText (parameter.getLabel(),    dontSendNotification);
+    }
+
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ParameterDisplayComponent)
 };