lvgl_cpp/examples/others/fragment/lv_example_fragment_2.c

/**
 * @file lv_example_fragment_2.c
 * @brief Navigation stack using obj fragment
 */
#include "../../lv_examples.h"

#if LV_USE_FRAGMENT && LV_USE_WIN && LV_BUILD_EXAMPLES

static void sample_fragment_ctor(lv_fragment_t * self, void * args);

static lv_obj_t * sample_fragment_create_obj(lv_fragment_t * self, lv_obj_t * parent);

static void sample_push_click(lv_event_t * e);

static void sample_pop_click(lv_event_t * e);

static void sample_fragment_inc_click(lv_event_t * e);

typedef struct sample_fragment_t {
    lv_fragment_t base;
    lv_obj_t * label;
    int depth;
    int counter;
} sample_fragment_t;

static const lv_fragment_class_t sample_cls = {
    .constructor_cb = sample_fragment_ctor,
    .create_obj_cb = sample_fragment_create_obj,
    .instance_size = sizeof(sample_fragment_t)
};

static lv_obj_t * container = NULL;

void lv_example_fragment_2(void)
{
    lv_obj_t * root = lv_obj_create(lv_scr_act());
    lv_obj_set_size(root, LV_PCT(100), LV_PCT(100));
    lv_obj_set_layout(root, LV_LAYOUT_GRID);
    static const lv_coord_t col_dsc[] = {LV_GRID_FR(1), LV_GRID_FR(1), LV_GRID_TEMPLATE_LAST};
    static const lv_coord_t row_dsc[] = {LV_GRID_FR(1), LV_GRID_CONTENT, LV_GRID_TEMPLATE_LAST};
    lv_obj_set_grid_dsc_array(root, col_dsc, row_dsc);
    container = lv_obj_create(root);
    lv_obj_remove_style_all(container);
    lv_obj_set_grid_cell(container, LV_GRID_ALIGN_STRETCH, 0, 2, LV_GRID_ALIGN_STRETCH, 0, 1);

    lv_obj_t * push_btn = lv_btn_create(root);
    lv_obj_t * push_label = lv_label_create(push_btn);
    lv_label_set_text(push_label, "Push");

    lv_obj_t * pop_btn = lv_btn_create(root);
    lv_obj_t * pop_label = lv_label_create(pop_btn);
    lv_label_set_text(pop_label, "Pop");
    lv_obj_set_grid_cell(push_btn, LV_GRID_ALIGN_START, 0, 1, LV_GRID_ALIGN_CENTER, 1, 1);
    lv_obj_set_grid_cell(pop_btn, LV_GRID_ALIGN_END, 1, 1, LV_GRID_ALIGN_CENTER, 1, 1);

    lv_fragment_manager_t * manager = lv_fragment_manager_create(NULL);
    int depth = 0;
    lv_fragment_t * fragment = lv_fragment_create(&sample_cls, &depth);
    lv_fragment_manager_push(manager, fragment, &container);
    lv_obj_add_event_cb(push_btn, sample_push_click, LV_EVENT_CLICKED, manager);
    lv_obj_add_event_cb(pop_btn, sample_pop_click, LV_EVENT_CLICKED, manager);
}


static void sample_fragment_ctor(lv_fragment_t * self, void * args)
{
    LV_UNUSED(args);
    ((sample_fragment_t *) self)->depth = *((int *) args);
    ((sample_fragment_t *) self)->counter = 0;
}

static lv_obj_t * sample_fragment_create_obj(lv_fragment_t * self, lv_obj_t * parent)
{
    sample_fragment_t * fragment = (sample_fragment_t *) self;
    lv_obj_t * content = lv_obj_create(parent);
    lv_obj_remove_style_all(content);
    lv_obj_set_style_bg_opa(content, LV_OPA_50, 0);
    lv_obj_set_style_bg_color(content, lv_palette_main(LV_PALETTE_YELLOW), 0);
    lv_obj_set_size(content, LV_PCT(100), LV_PCT(100));
    lv_obj_set_flex_flow(content, LV_FLEX_FLOW_COLUMN);
    lv_obj_t * depth = lv_label_create(content);
    lv_label_set_text_fmt(depth, "Depth: %d", fragment->depth);
    lv_obj_t * label = lv_label_create(content);
    fragment->label = label;
    lv_label_set_text_fmt(label, "The button has been pressed %d times", fragment->counter);

    lv_obj_t * inc_btn = lv_btn_create(content);
    lv_obj_t * inc_label = lv_label_create(inc_btn);
    lv_label_set_text(inc_label, "+1");
    lv_obj_add_event_cb(inc_btn, sample_fragment_inc_click, LV_EVENT_CLICKED, fragment);

    return content;
}

static void sample_push_click(lv_event_t * e)
{
    lv_fragment_manager_t * manager = (lv_fragment_manager_t *) lv_event_get_user_data(e);
    size_t stack_size = lv_fragment_manager_get_stack_size(manager);
    lv_fragment_t * fragment = lv_fragment_create(&sample_cls, &stack_size);
    lv_fragment_manager_push(manager, fragment, &container);
}

static void sample_pop_click(lv_event_t * e)
{
    lv_fragment_manager_t * manager = (lv_fragment_manager_t *) lv_event_get_user_data(e);
    lv_fragment_manager_pop(manager);
}

static void sample_fragment_inc_click(lv_event_t * e)
{
    sample_fragment_t * fragment = (sample_fragment_t *) lv_event_get_user_data(e);
    fragment->counter++;
    lv_label_set_text_fmt(fragment->label, "The button has been pressed %d times", fragment->counter);
}

#endif