You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: direction.rs
    path of file: ./repos/komorebi/komorebi-core/src
    
    the code of the file until where you have to start completion: use crate::custom_layout::Column;
use crate::custom_layout::ColumnSplit;
use crate::custom_layout::ColumnSplitWithCapacity;
use crate::custom_layout::CustomLayout;
use crate::DefaultLayout;
use crate::OperationDirection;

pub trait Direction {
    fn index_in_direction(
        &self,
        op_direction: OperationDirection,
        idx: usize,
        count: usize,
    ) -> Option<usize>;

    fn is_valid_direction(
        &self,
        op_direction: OperationDirection,
        idx: usize,
        count: usize,
    ) -> bool;
    fn up_index(
        &self,
        op_direction: Option<OperationDirection>,
        idx: usize,
        count: Option<usize>,
    ) -> usize;
    fn down_index(
        &self,
        op_direction: Option<OperationDirection>,
        idx: usize,
        count: Option<usize>,
    ) -> usize;
    fn left_index(
        &self,
        op_direction: Option<OperationDirection>,
        idx: usize,
        count: Option<usize>,
    ) -> usize;
    fn right_index(
        &self,
        op_direction: Option<OperationDirection>,
        idx: us
    
fn get_grid_item(idx: usize, count: usize) -> GridItem {
    let num_cols = (count as f32).sqrt().ceil() as usize;
    let mut iter = 0;

    for col in 0..num_cols {
        let remaining_windows = count - iter;
        let remaining_columns = num_cols - col;
        let num_rows_in_this_col = remaining_windows / remaining_columns;

        for row in 0..num_rows_in_this_col {
            if iter == idx {
                return GridItem {
                    state: GridItemState::Valid,
                    row: row + 1,
                    num_rows: num_rows_in_this_col,
                    touching_edges: GridTouchingEdges {
                        left: col == 0,
                        right: col == num_cols - 1,
                        up: row == 0,
                        down: row == num_rows_in_this_col - 1,
                    },
                };
            }

            iter += 1;
        }
    }

    GridItem {
        state: GridItemState::Invalid,
        row: 0,
        num_rows: 0,
        touching_edges: GridTouchingEdges {
            left: true,
            right: true,
            up: true,
            down: true,
        },
    }
}