Add hook-in for plugin to report that a preset has been loaded (#142)

include/clap-juce-extensions/clap-juce-extensions.h

@@ -290,6 +290,17 @@ struct clap_juce_audio_processor_capabilities
             onPresetLoadError(location_kind, location, load_key, os_error, message);
     }
 
+    /**
+     * The plugin should call this when it has loaded a preset (whether requested from the host,
+     * or from internally within the plugin). The provided information will help the host to
+     * keep it's preset browser in-sync with the plugin.
+     */
+    void reportPresetLoaded(uint32_t location_kind, const char *location, const char *load_key)
+    {
+        if (onPresetLoaded != nullptr)
+            onPresetLoaded(location_kind, location, load_key);
+    }
+
     /*
      * If you are working with a host that chooses to not implement cookies you will
      * need to look up parameters by param_id. Use this method to do so.
@@ -320,6 +331,8 @@ struct clap_juce_audio_processor_capabilities
     std::function<void(uint32_t location_kind, const char *location, const char *load_key,
                        int32_t os_error, const juce::String &msg)>
         onPresetLoadError = nullptr;
+    std::function<void(uint32_t location_kind, const char *location, const char *load_key)>
+        onPresetLoaded = nullptr;
     std::function<const void *(const char *)> extensionGet = nullptr;
 
     friend const clap_plugin *ClapAdapter::clap_create_plugin(const struct clap_plugin_factory *,

src/wrapper/clap-juce-wrapper.cpp

@@ -42,7 +42,7 @@ JUCE_BEGIN_IGNORE_WARNINGS_MSVC(4100 4127 4244)
 #include <clap/helpers/plugin.hh>
 #include <clap/helpers/plugin.hxx>
 
-#if CLAP_VERSION_LT(1,2,0)
+#if CLAP_VERSION_LT(1, 2, 0)
 static_assert(false, "CLAP juce wrapper requires at least clap 1.2.0");
 #endif
 
@@ -442,6 +442,11 @@ class ClapJuceWrapper : public clap::helpers::Plugin<
                         _host.presetLoadOnError(location_kind, location, load_key, os_error,
                                                 msg.toRawUTF8());
                 };
+            processorAsClapExtensions->onPresetLoaded =
+                [this](uint32_t location_kind, const char *location, const char *load_key) {
+                    if (_host.canUsePresetLoad())
+                        _host.presetLoadLoaded(location_kind, location, load_key);
+                };
             processorAsClapExtensions->extensionGet = [this](const char *name) {
                 return _host.host()->get_extension(_host.host(), name);
             };