Change background color of element in Gridbox

[abdurj]

Hi, I have the following code:

  auto cell = []() { return filler() | bgcolor(Color::White); };
  vector<vector<Element>> rows;
  int x;
  cin >> x;
  for(int i = 0; i < x; ++i){
    vector<Element> row;
    for(int j = 0; j < x; ++j){
      row.emplace_back(cell());
    }
    rows.emplace_back(row);
  }
  auto display = gridbox(rows);
  auto screen = Screen::Create(Dimension::Fixed(10), Dimension::Fixed(10));
  Render(screen, display);

Say I wanted to change the background color of the element at display[0][0], how would I go about doing this?

[ArthurSonzogni]

You can apply the bgcolor function.

Using the pipe operator:

auto colored_element = element | bgcolor(Color::Red);

Or as a function:

auto colored_element = bgcolor(Color::Red, element);

In your example, you can use |= to apply the bgcolor and replace the element with the new version in the array.

rows[0][0] |= bgcolor(Color::Red);

[abdurj]

Is there a way to apply these operators after I've already constructed the gridbox?

For example if I do
auto display = gridbox(rows)
then do

rows[0][0] |= bgcolor(...)
Render(screen,display)

Edit:
Just needed to remake the gridbox:

auto display = gridbox(rows);
rows[0][0] |= bgcolor(Color::White);
display = gridbox(rows);
Render(screen, display);

Thanks :)