[FL-3816] Text Box rework (#3642)

* text box: rework text box to use less memory
* text box: optimize lines iteration
* text box: fix back scrolling
* text box: add end focus support
* text box: allocate index buffer on stack instead of heap
* text box: fix index decrement
* apps: add text box debug app
* debug: rework text box view app with view stack
* debug app: rename text_box_test app to text_box_element_test
* text box: rework text box module
* debug: update text box view test
* text box: fix end focus initial offset
* debug: fix memory leak in text box view test app

Co-authored-by: あく <alleteam@gmail.com>
Co-authored-by: hedger <hedger@users.noreply.github.com>

applications/debug/text_box_element_test/application.fam

@@ -0,0 +1,10 @@
+App(
+    appid="text_box_element_test",
+    name="Text Box Element Test",
+    apptype=FlipperAppType.DEBUG,
+    entry_point="text_box_element_test_app",
+    requires=["gui"],
+    stack_size=1 * 1024,
+    order=140,
+    fap_category="Debug",
+)

applications/debug/text_box_element_test/text_box_element_test.c

@@ -0,0 +1,129 @@
+#include <furi.h>
+#include <gui/gui.h>
+#include <input/input.h>
+#include <gui/elements.h>
+
+#define TAG "TextBoxTest"
+
+static void text_box_center_top_secondary_128x22(Canvas* canvas) {
+    canvas_draw_frame(canvas, 0, 0, 128, 22);
+    elements_text_box(canvas, 0, 0, 128, 22, AlignCenter, AlignTop, "secondary font test", false);
+}
+
+static void text_box_right_bottom_bold_128x22(Canvas* canvas) {
+    canvas_draw_frame(canvas, 0, 0, 128, 22);
+    elements_text_box(
+        canvas, 0, 0, 128, 22, AlignRight, AlignBottom, "\e#Bold font test\e#", false);
+}
+
+static void text_box_left_center_mixed_80x50(Canvas* canvas) {
+    canvas_draw_frame(canvas, 0, 0, 80, 50);
+    elements_text_box(
+        canvas,
+        0,
+        0,
+        80,
+        50,
+        AlignLeft,
+        AlignCenter,
+        "\e#Never\e# gonna give you up\n\e!Never\e! gonna let you down",
+        false);
+}
+
+static void text_box_center_center_secondary_110x44(Canvas* canvas) {
+    canvas_draw_frame(canvas, 4, 20, 110, 30);
+    elements_text_box(
+        canvas,
+        4,
+        20,
+        110,
+        30,
+        AlignCenter,
+        AlignCenter,
+        "Loooooooooooooo0000000ooong file name from happy 100500 Flipper 0wners",
+        true);
+}
+
+static void (*text_box_test_render[])(Canvas* canvas) = {
+    text_box_center_top_secondary_128x22,
+    text_box_right_bottom_bold_128x22,
+    text_box_left_center_mixed_80x50,
+    text_box_center_center_secondary_110x44,
+};
+
+typedef struct {
+    uint32_t idx;
+    FuriMutex* mutex;
+} TextBoxTestState;
+
+static void text_box_test_render_callback(Canvas* canvas, void* ctx) {
+    TextBoxTestState* state = ctx;
+    furi_mutex_acquire(state->mutex, FuriWaitForever);
+    canvas_clear(canvas);
+
+    text_box_test_render[state->idx](canvas);
+
+    furi_mutex_release(state->mutex);
+}
+
+static void text_box_test_input_callback(InputEvent* input_event, void* ctx) {
+    FuriMessageQueue* event_queue = ctx;
+    furi_message_queue_put(event_queue, input_event, FuriWaitForever);
+}
+
+int32_t text_box_element_test_app(void* p) {
+    UNUSED(p);
+    FuriMessageQueue* event_queue = furi_message_queue_alloc(32, sizeof(InputEvent));
+    furi_check(event_queue);
+
+    TextBoxTestState state = {.idx = 0, .mutex = NULL};
+    state.mutex = furi_mutex_alloc(FuriMutexTypeNormal);
+
+    if(!state.mutex) {
+        FURI_LOG_E(TAG, "Cannot create mutex");
+        return 0;
+    }
+
+    ViewPort* view_port = view_port_alloc();
+
+    view_port_draw_callback_set(view_port, text_box_test_render_callback, &state);
+    view_port_input_callback_set(view_port, text_box_test_input_callback, event_queue);
+
+    // Open GUI and register view_port
+    Gui* gui = furi_record_open(RECORD_GUI);
+    gui_add_view_port(gui, view_port, GuiLayerFullscreen);
+
+    uint32_t test_renders_num = COUNT_OF(text_box_test_render);
+    InputEvent event;
+    while(furi_message_queue_get(event_queue, &event, FuriWaitForever) == FuriStatusOk) {
+        furi_mutex_acquire(state.mutex, FuriWaitForever);
+
+        if(event.type == InputTypeShort) {
+            if(event.key == InputKeyRight) {
+                if(state.idx < test_renders_num - 1) {
+                    state.idx++;
+                }
+            } else if(event.key == InputKeyLeft) {
+                if(state.idx > 0) {
+                    state.idx--;
+                }
+            } else if(event.key == InputKeyBack) {
+                furi_mutex_release(state.mutex);
+                break;
+            }
+        }
+
+        furi_mutex_release(state.mutex);
+        view_port_update(view_port);
+    }
+
+    // remove & free all stuff created by app
+    gui_remove_view_port(gui, view_port);
+    view_port_free(view_port);
+    furi_message_queue_free(event_queue);
+    furi_mutex_free(state.mutex);
+
+    furi_record_close(RECORD_GUI);
+
+    return 0;
+}