ra8_widget_button.c

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#include "ra8_check.h"
#include "ra8_widget.h"
#include "ra8_widget_internal.h"

static const char* s_tag = "ra8_widget_button";

RA8_INTERNAL
static uint32_t internal_button_face(const ra8_widget_button_t* b)
{
  if (b->pressed) {
    return b->face_pressed;
  }
  return b->face;
}

RA8_INTERNAL
static void internal_button_render(ra8_widget_t* w)
{
  ra8_widget_button_t* b = (ra8_widget_button_t*)w->ctx;
  if (b == nullptr) {
    return;
  }
  if (b->paint == nullptr) {
    return;
  }
  const uint32_t face = internal_button_face(b);
  priv_widget_fill_box(b->paint, &w->rect, face, b->border, b->border_w);
  if (b->text == nullptr) {
    return;
  }
  if (b->paint->draw_text == nullptr) {
    return;
  }
  int32_t tx = 0;
  int32_t ty = 0;
  priv_widget_text_pos(b->paint, &w->rect, b->text, b->pad, b->align, &tx, &ty);
  b->paint->draw_text(b->paint->user, tx, ty, b->text, b->fg, face);
}

RA8_INTERNAL
static bool internal_button_on_input(ra8_widget_t* w, const ra8_widget_event_t* ev)
{
  ra8_widget_button_t* b = (ra8_widget_button_t*)w->ctx;
  if (b == nullptr) {
    return false;
  }
  if (ev->kind != k_ra8_widget_ev_touch) {
    return false;
  }
  b->pressed = !b->pressed;
  b->presses++;
  (void)ra8_widget_invalidate(w, k_ra8_widget_refresh_fast);
  if (b->on_press != nullptr) {
    b->on_press(w);
  }
  return true;
}

static const ra8_widget_vtable_t s_button_vt = {
  .measure  = nullptr,
  .render   = internal_button_render,
  .on_input = internal_button_on_input,
};
 
const ra8_widget_vtable_t* ra8_widget_button_vtable(void)
{
  return &s_button_vt;
}
 
[[nodiscard]] ra8_err_t ra8_widget_button_init(ra8_widget_t* w, ra8_widget_button_t* button)
{
  RA8_CHECK_NULL_PTR(w, s_tag, "w must not be nullptr");
  RA8_CHECK_NULL_PTR(button, s_tag, "button must not be nullptr");
  w->vt      = ra8_widget_button_vtable();
  w->ctx     = button;
  w->visible = true;
  return k_ra8_ok;
}