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#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <OLEDDisplay.h>
#include <Wire.h>
#include "screen.h"
void draw_lines(OLEDDisplay *screen, struct display_status *status);
void update_lines(struct display_status *status);
void init_msg(char *msg, size_t size);
/* Effectively const. For type safety reasons. */
static char NOTHING[] = {'\0'};
void display_status_init(OLEDDisplay *screen, struct display_status *status, char *msg)
{
status->delta = 2; /* Currently default */
status->screen = screen;
init_msg(msg, strlen(msg));
status->message = msg;
status->line_cursor = 0;
status->last_scroll_time = time(NULL);
update_lines(status);
}
/**
* Turns all whitespace into literal spaces to save screen real-estate and
* possible misinterpretation.
*/
void init_msg(char *msg, size_t size)
{
size_t i;
for (i = 0; i < size; i++) {
switch (msg[i]) {
case '\n':
case '\t':
case '\r':
msg[i] = ' ';
break;
case '\0':
goto end;
default:
break;
}
}
end:
return;
}
int display_update_scroll(struct display_status *status)
{
time_t crr_time = time(NULL);
/* Only scroll lines once a delta, because --- duh! */
if (status->last_scroll_time - crr_time > status->delta) {
status->last_scroll_time += status->delta;
status->line_cursor++;
update_lines(status);
draw_lines(status->screen, status);
}
if (status->first_line == NOTHING && status->second_line == NOTHING) {
return END_OF_MESSAGE;
} else {
return 0;
}
}
void draw_lines(OLEDDisplay *screen, struct display_status *status)
{
screen->clear();
screen->drawString(0, 0, status->first_line);
screen->drawString(0, SCREEN_HEIGHT / 2, status->second_line);
screen->display();
}
void update_lines(struct display_status *status)
{
status->first_line = (status->line_cursor * SCREEN_MAX_CHARS < status->message_len)
? status->message + status->line_cursor * SCREEN_MAX_CHARS
: NOTHING;
status->second_line = (status->line_cursor * SCREEN_MAX_CHARS < status->message_len)
? status->message + (status->line_cursor + 1) * SCREEN_MAX_CHARS
: NOTHING;
}
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