add tap tempo to metronomic app (#2605)

* _

* format

* fix new tree in Arch

firmware/application/external/metronome/ui_metronome.hpp

@@ -27,6 +27,8 @@
 #include "audio.hpp"
 #include "ch.h"
 
+#include <deque>
+
 namespace ui::external_app::metronome {
 
 class MetronomeView : public View {
@@ -73,6 +75,11 @@ class MetronomeView : public View {
         1,
         ' '};
 
+    Button button_enter_tap_tempo{
+        {(sizeof("BPM:") + 6) * 8, 1 * 16, (sizeof("Tap Tempo") + 3) * 8, 16},
+        "Tap Tempo",
+    };
+
     NumberField field_rythm_unaccent_time{// e.g. 3 in 3/4 beat
                                           {(sizeof("Rhythm:") + 1) * 8, 4 * 16},
                                           2,
@@ -121,6 +128,45 @@ class MetronomeView : public View {
         {0 * 16, 8 * 16, screen_width, screen_height - 14 * 16}};
 };
 
+class MetronomeTapTempoView : public View {
+   public:
+    std::function<void(uint16_t)> on_apply{};
+
+    MetronomeTapTempoView(NavigationView& nav, uint16_t bpm);
+
+    std::string title() const override { return "Tap.T"; };
+    void focus() override;
+    void paint(Painter& painter) override;
+
+   private:
+    void on_tap(Painter& painter);
+
+    NavigationView& nav_;
+
+    uint16_t bpm_{0};
+    uint16_t bpm_when_entered_{0};          // this pass from MetronomeView and need to restore if user cancel
+    std::deque<uint16_t> bpms_deque = {0};  // take average for recent taps to debounce
+    uint32_t last_tap_time{0};
+
+    std::string input_buffer{""};  // needed by text_prompt
+
+    Button button_input{
+        {0, 0, screen_width, 2 * 16},
+        "Input BPM"};
+
+    Button button_tap{
+        {0, 8 * 16, screen_width, 7 * 16},
+        "Tap BPM"};
+
+    Button button_cancel{
+        {1, 17 * 16, screen_width / 2 - 4, 2 * 16},
+        "Cancel"};
+
+    Button button_apply{
+        {1 + screen_width / 2 + 1, 17 * 16, screen_width / 2 - 4, 2 * 16},
+        "Apply"};
+};
+
 }  // namespace ui::external_app::metronome
 
 #endif /*__UI_METRONOME_H__*/