add basic metronome app (#409)

* add basic metronome app

* add bpb, tap to bpm, update widgets

* use event pressed for bpm tap

* move case statement break to the right place

* narrow bpm selection range, override touch events

* fix arc knob style

* re-enable sleeping in destructor

1 files changed, 169 insertions, 0 deletions

diff --git a/src/displayapp/screens/Metronome.cpp b/src/displayapp/screens/Metronome.cpp
new file mode 100644
index 00000000..c536e301
--- /dev/null
+++ b/src/displayapp/screens/Metronome.cpp
@@ -0,0 +1,169 @@
+#include "Metronome.h"
+
+#include "Screen.h"
+#include "Symbols.h"
+#include "lvgl/lvgl.h"
+#include "FreeRTOSConfig.h"
+#include "task.h"
+
+#include <string>
+#include <tuple>
+
+using namespace Pinetime::Applications::Screens;
+
+namespace {
+  float calculateDelta(const TickType_t startTime, const TickType_t currentTime) {
+    TickType_t delta = 0;
+    // Take care of overflow
+    if (startTime > currentTime) {
+      delta = 0xffffffff - startTime;
+      delta += (currentTime + 1);
+    } else {
+      delta = currentTime - startTime;
+    }
+    return static_cast<float>(delta) / static_cast<float>(configTICK_RATE_HZ);
+  }
+
+  static void eventHandler(lv_obj_t* obj, lv_event_t event) {
+    Metronome* screen = static_cast<Metronome*>(obj->user_data);
+    screen->OnEvent(obj, event);
+  }
+
+  lv_obj_t* createLabel(const char* name, lv_obj_t* reference, lv_align_t align, lv_font_t* font, uint8_t x = 0, uint8_t y = 0) {
+    lv_obj_t* label = lv_label_create(lv_scr_act(), nullptr);
+    lv_obj_set_style_local_text_font(label, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, font);
+    lv_obj_set_style_local_text_color(label, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GRAY);
+    lv_label_set_text(label, name);
+    lv_obj_align(label, reference, align, x, y);
+
+    return label;
+  }
+}
+
+Metronome::Metronome(DisplayApp* app, Controllers::MotorController& motorController, System::SystemTask& systemTask)
+  : Screen(app), running {true}, currentState {States::Stopped}, startTime {}, motorController {motorController}, systemTask {systemTask} {
+
+  bpmArc = lv_arc_create(lv_scr_act(), nullptr);
+  bpmArc->user_data = this;
+  lv_obj_set_event_cb(bpmArc, eventHandler);
+  lv_arc_set_bg_angles(bpmArc, 0, 270);
+  lv_arc_set_rotation(bpmArc, 135);
+  lv_arc_set_range(bpmArc, 40, 220);
+  lv_arc_set_value(bpmArc, bpm);
+  lv_obj_set_size(bpmArc, 210, 210);
+  lv_arc_set_adjustable(bpmArc, true);
+  lv_obj_align(bpmArc, lv_scr_act(), LV_ALIGN_IN_TOP_MID, 0, 7);
+
+  bpmValue = createLabel(std::to_string(lv_arc_get_value(bpmArc)).c_str(), bpmArc, LV_ALIGN_IN_TOP_MID, &jetbrains_mono_76, 0, 55);
+  bpmLegend = createLabel("bpm", bpmValue, LV_ALIGN_OUT_BOTTOM_MID, &jetbrains_mono_bold_20, 0, 0);
+
+  bpmTap = lv_btn_create(lv_scr_act(), nullptr);
+  bpmTap->user_data = this;
+  lv_obj_set_event_cb(bpmTap, eventHandler);
+  lv_obj_set_style_local_bg_opa(bpmTap, LV_BTN_PART_MAIN, LV_STATE_DEFAULT, LV_OPA_TRANSP);
+  lv_obj_set_height(bpmTap, 80);
+  lv_obj_align(bpmTap, bpmValue, LV_ALIGN_IN_TOP_MID, 0, 0);
+
+  bpbDropdown = lv_dropdown_create(lv_scr_act(), nullptr);
+  bpbDropdown->user_data = this;
+  lv_obj_set_event_cb(bpbDropdown, eventHandler);
+  lv_obj_set_style_local_pad_left(bpbDropdown, LV_DROPDOWN_PART_MAIN, LV_STATE_DEFAULT, 20);
+  lv_obj_set_style_local_pad_left(bpbDropdown, LV_DROPDOWN_PART_LIST, LV_STATE_DEFAULT, 20);
+  lv_obj_align(bpbDropdown, lv_scr_act(), LV_ALIGN_IN_BOTTOM_LEFT, 15, -4);
+  lv_dropdown_set_options(bpbDropdown, "1\n2\n3\n4\n5\n6\n7\n8\n9");
+  lv_dropdown_set_selected(bpbDropdown, bpb - 1);
+  bpbLegend = lv_label_create(bpbDropdown, nullptr);
+  lv_label_set_text(bpbLegend, "bpb");
+  lv_obj_align(bpbLegend, bpbDropdown, LV_ALIGN_IN_RIGHT_MID, -15, 0);
+
+  playPause = lv_btn_create(lv_scr_act(), nullptr);
+  playPause->user_data = this;
+  lv_obj_set_event_cb(playPause, eventHandler);
+  lv_obj_align(playPause, lv_scr_act(), LV_ALIGN_IN_BOTTOM_RIGHT, -15, -10);
+  lv_obj_set_height(playPause, 39);
+  playPauseLabel = lv_label_create(playPause, nullptr);
+  lv_label_set_text(playPauseLabel, Symbols::play);
+
+  app->SetTouchMode(DisplayApp::TouchModes::Polling);
+}
+
+Metronome::~Metronome() {
+  app->SetTouchMode(DisplayApp::TouchModes::Gestures);
+  systemTask.PushMessage(Pinetime::System::SystemTask::Messages::EnableSleeping);
+  lv_obj_clean(lv_scr_act());
+}
+
+bool Metronome::OnTouchEvent(Pinetime::Applications::TouchEvents event) {
+  return true;
+}
+
+bool Metronome::Refresh() {
+  switch (currentState) {
+    case States::Stopped: {
+      break;
+    }
+    case States::Running: {
+      if (calculateDelta(startTime, xTaskGetTickCount()) >= (60.0 / bpm)) {
+        counter--;
+        startTime -= 60.0 / bpm;
+        startTime = xTaskGetTickCount();
+        if (counter == 0) {
+          counter = bpb;
+          motorController.SetDuration(90);
+        } else {
+          motorController.SetDuration(30);
+        }
+      }
+      break;
+    }
+  }
+  return running;
+}
+
+void Metronome::OnEvent(lv_obj_t* obj, lv_event_t event) {
+  switch (event) {
+    case LV_EVENT_VALUE_CHANGED: {
+      if (obj == bpmArc) {
+        bpm = lv_arc_get_value(bpmArc);
+        lv_label_set_text_fmt(bpmValue, "%03d", bpm);
+      } else if (obj == bpbDropdown) {
+        bpb = lv_dropdown_get_selected(obj) + 1;
+      }
+      break;
+    }
+    case LV_EVENT_PRESSED: {
+      if (obj == bpmTap) {
+        float timeDelta = calculateDelta(tappedTime, xTaskGetTickCount());
+        if (tappedTime == 0 || timeDelta > 3) {
+          tappedTime = xTaskGetTickCount();
+        } else {
+          bpm = ceil(60.0 / timeDelta);
+          lv_arc_set_value(bpmArc, bpm);
+          lv_label_set_text_fmt(bpmValue, "%03d", bpm);
+          tappedTime = xTaskGetTickCount();
+        }
+      }
+      break;
+    }
+    case LV_EVENT_CLICKED: {
+      if (obj == playPause) {
+        currentState = (currentState == States::Stopped ? States::Running : States::Stopped);
+        switch (currentState) {
+          case States::Stopped: {
+            lv_label_set_text(playPauseLabel, Symbols::play);
+            systemTask.PushMessage(Pinetime::System::SystemTask::Messages::EnableSleeping);
+            break;
+          }
+          case States::Running: {
+            lv_label_set_text(playPauseLabel, Symbols::pause);
+            systemTask.PushMessage(Pinetime::System::SystemTask::Messages::DisableSleeping);
+            startTime = xTaskGetTickCount();
+            counter = 1;
+            break;
+          }
+        }
+      }
+      break;
+    }
+  }
+}