nesemu/debugger/cursor.c

//
// Created by william on 1/12/24.
//

#include <assert.h>
#include "cursor.h"

void cursor_init(Cursor *cursor, WINDOW *window, int max_x, int max_y) {
    cursor->window = window;
    cursor->min_x = 1;
    cursor->min_y = 1;
    cursor->max_x = max_x;
    cursor->max_y = max_y;
    cursor->multiplier_x = 1;
    cursor->multiplier_y = 1;
    cursor->width = 1;
    cursor->pos_x = 0;
    cursor->pos_y = 0;
    cursor->enabled = false;
}

void cursor_set_at(Cursor *cursor, int at) {
    int win_x = cursor->min_x + cursor->pos_x * cursor->multiplier_x;
    int win_y = cursor->min_y + cursor->pos_y * cursor->multiplier_y;

    mvwchgat(cursor->window, win_y, win_x, cursor->width, at, 0, NULL);
}

void cursor_enable(Cursor *cursor) {
    cursor_set_at(cursor, CURSOR_AT_ENABLED);
    cursor->enabled = true;
}

void cursor_disable(Cursor *cursor) {
    cursor_set_at(cursor, CURSOR_AT_DISABLED);
    cursor->enabled = false;
}

void cursor_set_pos(Cursor *cursor, int x, int y) {
    assert(x >= 0);
    assert(y >= 0);

    bool enabled = cursor->enabled;
    if (enabled) {
        // Remove the cursor from its old position
        cursor_disable(cursor);
    }

    cursor->pos_x = x;
    cursor->pos_y = y;

    if (enabled) {
        // Display the cursor in the new position
        cursor_enable(cursor);
    }
}

int cursor_limit(int value, int limit) {
    if (value < 0) {
        return 0;
    }

    if (value > limit) {
        return limit;
    }

    return value;
}

void cursor_move(Cursor *cursor, int offset_x, int offset_y) {
    int x = cursor->pos_x + offset_x;
    x = cursor_limit(x, cursor->max_x);

    int y = cursor->pos_y + offset_y;
    y = cursor_limit(y, cursor->max_y);

    cursor_set_pos(cursor, x, y);
}