feat(ui): Added MIDI activity indicator to the Channel Node (input + …

…output)

src/MidiChannelNode.cpp

@@ -14,6 +14,12 @@ const char* mc::MidiChannelNode::sm_combo_items[] = {
 
 mc::MidiChannelNode::MidiChannelNode(std::function<float()> get_scale) : m_get_scale(get_scale)
 {
+    m_midi_channel_map_node.add_observer(this);
+}
+
+mc::MidiChannelNode::~MidiChannelNode()
+{
+    m_midi_channel_map_node.remove_observer(this);
 }
 
 void mc::MidiChannelNode::accept_serializer(nlohmann::json&       j,
@@ -33,11 +39,15 @@ void mc::MidiChannelNode::render_internal()
     ImGui::TextUnformatted("Channel map");
     ImNodes::EndNodeTitleBar();
     ImNodes::BeginInputAttribute(in_id());
+    m_input_indicator.render();
+    ImGui::SameLine();
     ImGui::TextUnformatted("MIDI in");
     ImNodes::EndInputAttribute();
     ImGui::SameLine(100 * m_get_scale());
     ImNodes::BeginOutputAttribute(out_id());
     ImGui::TextUnformatted("MIDI out");
+    ImGui::SameLine();
+    m_output_indicator.render();
     ImNodes::EndOutputAttribute();
 
     std::array<int, midi::ChannelMap::num_channels> channels;
@@ -113,6 +123,16 @@ void mc::MidiChannelNode::render_internal()
     }
 }
 
+void mc::MidiChannelNode::message_processed(std::span<const unsigned char> /*message_bytes*/)
+{
+    m_output_indicator.trigger();
+}
+
+void mc::MidiChannelNode::message_received(std::span<const unsigned char> /*message_bytes*/)
+{
+    m_input_indicator.trigger();
+}
+
 const char* mc::MidiChannelNode::get_label(size_t index)
 {
     static std::vector<std::string> labels;

src/MidiChannelNode.hpp

@@ -2,16 +2,18 @@
 
 #include <functional>
 
+#include "ActivityIndicator.hpp"
 #include "Node.hpp"
 #include "midi/ChannelMapNode.hpp"
 
 namespace mc
 {
 
-class MidiChannelNode final : public Node
+class MidiChannelNode final : public Node, private midi::GraphObserver
 {
 public:
-    MidiChannelNode(std::function<float()> get_scale);
+    explicit MidiChannelNode(std::function<float()> get_scale);
+    ~MidiChannelNode();
 
     void accept_serializer(nlohmann::json& j, const NodeSerializer& serializer) const override;
 
@@ -20,6 +22,8 @@ class MidiChannelNode final : public Node
 
 private:
     void render_internal() override;
+    void message_processed(std::span<const unsigned char> message_bytes) override;
+    void message_received(std::span<const unsigned char> message_bytes) override;
 
     static const char* get_label(size_t index);
     static const char* get_hidden_label(size_t index);
@@ -30,6 +34,9 @@ class MidiChannelNode final : public Node
     std::function<float()> m_get_scale;
     midi::ChannelMapNode   m_midi_channel_map_node;
 
+    ActivityIndicator m_input_indicator;
+    ActivityIndicator m_output_indicator;
+
     friend class NodeSerializer;
 };