Start on TTS support by logging the data that will become TTS lines

Includes some misc cleanup of haptic double-triggering (or
non-triggering), since those cases all end up being TTS event
double-reporting, which to me crosses the threshold from "annoying" to
"usability issue"

1 files changed, 97 insertions, 0 deletions

diff --git a/src/tangara/input/feedback_tts.cpp b/src/tangara/input/feedback_tts.cpp
new file mode 100644
index 00000000..a9267aa8
--- /dev/null
+++ b/src/tangara/input/feedback_tts.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2024 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "input/feedback_tts.hpp"
+
+#include <cstdint>
+#include <variant>
+
+#include "lvgl/lvgl.h"
+
+#include "core/lv_event.h"
+#include "core/lv_group.h"
+#include "core/lv_obj.h"
+#include "core/lv_obj_class.h"
+#include "core/lv_obj_tree.h"
+#include "extra/widgets/list/lv_list.h"
+#include "tts/events.hpp"
+#include "widgets/lv_label.h"
+
+#include "tts/events.hpp"
+#include "tts/provider.hpp"
+
+namespace input {
+
+TextToSpeech::TextToSpeech(tts::Provider& tts)
+    : tts_(tts), last_obj_(nullptr) {}
+
+auto TextToSpeech::feedback(lv_group_t* group, uint8_t event_type) -> void {
+  if (group != last_group_) {
+    last_group_ = group;
+    last_obj_ = nullptr;
+    if (group) {
+      tts_.feed(tts::SimpleEvent::kContextChanged);
+    }
+  }
+
+  if (group) {
+    lv_obj_t* focused = lv_group_get_focused(group);
+    if (focused == last_obj_) {
+      return;
+    }
+
+    last_obj_ = focused;
+    if (focused != nullptr) {
+      describe(*focused);
+    }
+  }
+}
+
+auto TextToSpeech::describe(lv_obj_t& obj) -> void {
+  if (lv_obj_check_type(&obj, &lv_btn_class) ||
+      lv_obj_check_type(&obj, &lv_list_btn_class)) {
+    auto desc = findDescription(obj);
+    tts_.feed(tts::SelectionChanged{
+        .new_selection =
+            tts::SelectionChanged::Selection{
+                .description = desc,
+                .is_interactive = true,
+            },
+    });
+  } else {
+    auto desc = findDescription(obj);
+    tts_.feed(tts::SelectionChanged{
+        .new_selection =
+            tts::SelectionChanged::Selection{
+                .description = desc,
+                .is_interactive = false,
+            },
+    });
+  }
+}
+
+auto TextToSpeech::findDescription(lv_obj_t& obj)
+    -> std::optional<std::string> {
+  if (lv_obj_get_child_cnt(&obj) > 0) {
+    for (size_t i = 0; i < lv_obj_get_child_cnt(&obj); i++) {
+      auto res = findDescription(*lv_obj_get_child(&obj, i));
+      if (res) {
+        return res;
+      }
+    }
+  }
+
+  if (lv_obj_check_type(&obj, &lv_label_class)) {
+    std::string text = lv_label_get_text(&obj);
+    if (!text.empty()) {
+      return text;
+    }
+  }
+
+  return {};
+}
+
+}  // namespace input