Add scroll velocity + more input methods

2 files changed, 226 insertions, 4 deletions

diff --git a/src/ui/encoder_input.cpp b/src/ui/encoder_input.cpp
index 62cb4c8b..f6f74aaf 100644
--- a/src/ui/encoder_input.cpp
+++ b/src/ui/encoder_input.cpp
@@ -10,11 +10,24 @@
 #include <memory>
 
 #include "core/lv_group.h"
+#include "esp_timer.h"
 #include "gpios.hpp"
 #include "hal/lv_hal_indev.h"
+#include "nvs.hpp"
 #include "relative_wheel.hpp"
 #include "touchwheel.hpp"
 
+constexpr int kDPadAngleThreshold = 20;
+constexpr int kLongPressDelayMs = 500;
+constexpr int kRepeatDelayMs = 250;
+
+static inline auto IsAngleWithin(int16_t wheel_angle,
+                                 int16_t target_angle,
+                                 int threshold) -> bool {
+  int16_t difference = (wheel_angle - target_angle + 127 + 255) % 255 - 127;
+  return difference <= threshold && difference >= -threshold;
+}
+
 namespace ui {
 
 static void encoder_read(lv_indev_drv_t* drv, lv_indev_data_t* data) {
@@ -25,7 +38,9 @@ static void encoder_read(lv_indev_drv_t* drv, lv_indev_data_t* data) {
 EncoderInput::EncoderInput(drivers::IGpios& gpios, drivers::TouchWheel& wheel)
     : gpios_(gpios),
       raw_wheel_(wheel),
-      relative_wheel_(std::make_unique<drivers::RelativeWheel>(wheel)) {
+      relative_wheel_(std::make_unique<drivers::RelativeWheel>(wheel)),
+      scroller_(std::make_unique<Scroller>()),
+      mode_(drivers::NvsStorage::InputModes::kRotatingWheel) {
   lv_indev_drv_init(&driver_);
   driver_.type = LV_INDEV_TYPE_ENCODER;
   driver_.read_cb = encoder_read;
@@ -37,10 +52,178 @@ EncoderInput::EncoderInput(drivers::IGpios& gpios, drivers::TouchWheel& wheel)
 auto EncoderInput::Read(lv_indev_data_t* data) -> void {
   raw_wheel_.Update();
   relative_wheel_->Update();
+  // GPIOs updating is handled by system_fsm.
+
+  uint64_t now_ms = esp_timer_get_time() / 1000;
+
+  // Deal with the potential overflow of our timer.
+  for (auto& it : touch_time_ms_) {
+    if (it.second > now_ms) {
+      // esp_timer overflowed.
+      it.second = 0;
+    }
+  }
+
+  // Check each button.
+  HandleKey(Keys::kVolumeUp, now_ms, !gpios_.Get(drivers::IGpios::Pin::kKeyUp));
+  HandleKey(Keys::kVolumeDown, now_ms,
+            !gpios_.Get(drivers::IGpios::Pin::kKeyDown));
+
+  drivers::TouchWheelData wheel_data = raw_wheel_.GetTouchWheelData();
+  HandleKey(Keys::kTouchWheel, now_ms, wheel_data.is_wheel_touched);
+  HandleKey(Keys::kTouchWheelCenter, now_ms, wheel_data.is_button_touched);
+
+  HandleKey(
+      Keys::kDirectionalUp, now_ms,
+      wheel_data.is_wheel_touched &&
+          IsAngleWithin(wheel_data.wheel_position, 0, kDPadAngleThreshold));
+  HandleKey(
+      Keys::kDirectionalLeft, now_ms,
+      wheel_data.is_wheel_touched &&
+          IsAngleWithin(wheel_data.wheel_position, 63, kDPadAngleThreshold));
+  HandleKey(
+      Keys::kDirectionalDown, now_ms,
+      wheel_data.is_wheel_touched &&
+          IsAngleWithin(wheel_data.wheel_position, 127, kDPadAngleThreshold));
+  HandleKey(
+      Keys::kDirectionalRight, now_ms,
+      wheel_data.is_wheel_touched &&
+          IsAngleWithin(wheel_data.wheel_position, 189, kDPadAngleThreshold));
+
+  // We now have enough information to give LVGL its update.
+  switch (mode_) {
+    case drivers::NvsStorage::InputModes::kButtonsOnly:
+      data->state = LV_INDEV_STATE_RELEASED;
+      if (ShortPressTrigger(Keys::kVolumeUp)) {
+        data->enc_diff = -1;
+      } else if (ShortPressTrigger(Keys::kVolumeDown)) {
+        data->enc_diff = 1;
+      } else if (LongPressTrigger(Keys::kVolumeDown, now_ms)) {
+        data->state = LV_INDEV_STATE_PRESSED;
+      } else if (LongPressTrigger(Keys::kVolumeUp, now_ms)) {
+        // TODO: Back button event
+      }
+      break;
+    case drivers::NvsStorage::InputModes::kButtonsWithWheel:
+      data->state = ShortPressTrigger(Keys::kTouchWheel)
+                        ? LV_INDEV_STATE_PRESSED
+                        : LV_INDEV_STATE_RELEASED;
+      if (ShortPressTriggerRepeating(Keys::kVolumeUp, now_ms)) {
+        data->enc_diff = scroller_->AddInput(now_ms, -1);
+      } else if (ShortPressTriggerRepeating(Keys::kVolumeDown, now_ms)) {
+        data->enc_diff = scroller_->AddInput(now_ms, 1);
+      }
+
+      if (!touch_time_ms_.contains(Keys::kVolumeDown) &&
+          !touch_time_ms_.contains(Keys::kVolumeUp)) {
+        data->enc_diff = scroller_->AddInput(now_ms, 0);
+      }
+      // TODO: Long-press events.
+      break;
+    case drivers::NvsStorage::InputModes::kDirectionalWheel:
+      data->state = ShortPressTrigger(Keys::kTouchWheelCenter)
+                        ? LV_INDEV_STATE_PRESSED
+                        : LV_INDEV_STATE_RELEASED;
+      if (!ShortPressTriggerRepeating(Keys::kTouchWheel, now_ms)) {
+        break;
+      }
+      if (ShortPressTriggerRepeating(Keys::kDirectionalUp, now_ms)) {
+        data->enc_diff = scroller_->AddInput(now_ms, -1);
+      } else if (ShortPressTriggerRepeating(Keys::kDirectionalDown, now_ms)) {
+        data->enc_diff = scroller_->AddInput(now_ms, 1);
+      } else if (ShortPressTrigger(Keys::kDirectionalRight)) {
+        // TODO: ???
+      } else if (ShortPressTrigger(Keys::kDirectionalLeft)) {
+        // TODO: Back button event.
+      }
+
+      if (!touch_time_ms_.contains(Keys::kDirectionalUp) &&
+          !touch_time_ms_.contains(Keys::kDirectionalDown)) {
+        data->enc_diff = scroller_->AddInput(now_ms, 0);
+      }
+      // TODO: Long-press events.
+      break;
+    case drivers::NvsStorage::InputModes::kRotatingWheel:
+      if (!raw_wheel_.GetTouchWheelData().is_wheel_touched) {
+        data->enc_diff = scroller_->AddInput(now_ms, 0);
+      } else if (relative_wheel_->ticks() != 0) {
+        data->enc_diff = scroller_->AddInput(now_ms, relative_wheel_->ticks());
+      } else {
+        data->enc_diff = 0;
+      }
+      data->state = relative_wheel_->is_clicking() ? LV_INDEV_STATE_PRESSED
+                                                   : LV_INDEV_STATE_RELEASED;
+      // TODO: Long-press events.
+      break;
+  }
 
-  data->enc_diff = relative_wheel_->ticks();
-  data->state = relative_wheel_->is_clicking() ? LV_INDEV_STATE_PRESSED
-                                               : LV_INDEV_STATE_RELEASED;
+  // TODO: Apply inertia / acceleration.
 }
 
+auto EncoderInput::HandleKey(Keys key, uint64_t ms, bool clicked) -> void {
+  if (!clicked) {
+    touch_time_ms_.erase(key);
+    short_press_fired_.erase(key);
+    long_press_fired_.erase(key);
+    return;
+  }
+  if (!touch_time_ms_.contains(key)) {
+    touch_time_ms_[key] = ms;
+  }
+}
+
+auto EncoderInput::ShortPressTrigger(Keys key) -> bool {
+  if (touch_time_ms_.contains(key) && !short_press_fired_.contains(key)) {
+    short_press_fired_[key] = true;
+    return true;
+  }
+  return false;
+}
+
+auto EncoderInput::ShortPressTriggerRepeating(Keys key, uint64_t ms) -> bool {
+  if (touch_time_ms_.contains(key) &&
+      (!short_press_fired_.contains(key) ||
+       ms - touch_time_ms_[key] >= kRepeatDelayMs)) {
+    touch_time_ms_[key] = ms;
+    short_press_fired_[key] = true;
+    return true;
+  }
+  return false;
+}
+
+auto EncoderInput::LongPressTrigger(Keys key, uint64_t ms) -> bool {
+  if (touch_time_ms_.contains(key) && !long_press_fired_.contains(key) &&
+      ms - touch_time_ms_[key] >= kLongPressDelayMs) {
+    long_press_fired_[key] = true;
+    return true;
+  }
+  return false;
+}
+
+auto Scroller::AddInput(uint64_t ms, int direction) -> int {
+  bool dir_changed =
+      ((velocity_ < 0 && direction > 0) || (velocity_ > 0 && direction < 0));
+  if (direction == 0 || dir_changed) {
+    last_input_ms_ = ms;
+    velocity_ = 0;
+    return 0;
+  }
+  // Decay with time
+  if (last_input_ms_ > ms) {
+    last_input_ms_ = 0;
+  }
+  uint diff = ms - last_input_ms_;
+  uint diff_steps = diff / 25;
+  last_input_ms_ = ms + (last_input_ms_ % 50);
+  // Use powers of two for our exponential decay so we can implement decay
+  // trivially via bit shifting.
+  velocity_ >>= diff_steps;
+
+  velocity_ += direction * 1000;
+  if (velocity_ > 0) {
+    return (velocity_ + 500) / 1000;
+  } else {
+    return (velocity_ - 500) / 1000;
+  }
+}
 }  // namespace ui
diff --git a/src/ui/include/encoder_input.hpp b/src/ui/include/encoder_input.hpp
index 9c114e80..e685a7a2 100644
--- a/src/ui/include/encoder_input.hpp
+++ b/src/ui/include/encoder_input.hpp
@@ -6,17 +6,22 @@
 
 #pragma once
 
+#include <stdint.h>
+#include <deque>
 #include <memory>
 
 #include "core/lv_group.h"
 #include "gpios.hpp"
 #include "hal/lv_hal_indev.h"
 
+#include "nvs.hpp"
 #include "relative_wheel.hpp"
 #include "touchwheel.hpp"
 
 namespace ui {
 
+class Scroller;
+
 /*
  * Main input device abstracting that handles turning lower-level input device
  * drivers into events and LVGL inputs.
@@ -31,6 +36,7 @@ class EncoderInput {
   auto Read(lv_indev_data_t* data) -> void;
   auto registration() -> lv_indev_t* { return registration_; }
 
+  auto mode(drivers::NvsStorage::InputModes mode) { mode_ = mode; }
   auto lock(bool l) -> void { is_locked_ = l; }
 
  private:
@@ -40,8 +46,41 @@ class EncoderInput {
   drivers::IGpios& gpios_;
   drivers::TouchWheel& raw_wheel_;
   std::unique_ptr<drivers::RelativeWheel> relative_wheel_;
+  std::unique_ptr<Scroller> scroller_;
 
+  drivers::NvsStorage::InputModes mode_;
   bool is_locked_;
+
+  enum class Keys {
+    kVolumeUp,
+    kVolumeDown,
+    kTouchWheel,
+    kTouchWheelCenter,
+    kDirectionalUp,
+    kDirectionalRight,
+    kDirectionalDown,
+    kDirectionalLeft,
+  };
+
+  std::unordered_map<Keys, uint64_t> touch_time_ms_;
+  std::unordered_map<Keys, bool> short_press_fired_;
+  std::unordered_map<Keys, bool> long_press_fired_;
+
+  auto HandleKey(Keys key, uint64_t ms, bool clicked) -> void;
+  auto ShortPressTrigger(Keys key) -> bool;
+  auto ShortPressTriggerRepeating(Keys key, uint64_t ms) -> bool;
+  auto LongPressTrigger(Keys key, uint64_t ms) -> bool;
+};
+
+class Scroller {
+ public:
+  Scroller() : last_input_ms_(0), velocity_(0) {}
+
+  auto AddInput(uint64_t, int) -> int;
+
+ private:
+  uint64_t last_input_ms_;
+  int velocity_;
 };
 
 }  // namespace ui