gridview.dart

GridView.builder(
            shrinkWrap: true,
            physics: NeverScrollableScrollPhysics(),
            gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
              crossAxisCount: columnCount,
            ),
            itemBuilder: (context, position) {
              // Get row and column number of square
              int rowNumber = (position / columnCount).floor();
              int columnNumber = (position % columnCount);

              Image image;

              if (openedSquares[position] == false) {
                if (flaggedSquares[position] == true) {
                  image = getImage(ImageType.flagged);
                } else {
                  image = getImage(ImageType.facingDown);
                }
              } else {
                if (board[rowNumber][columnNumber].hasBomb) {
                  image = getImage(ImageType.bomb);
                } else {
                  image = getImage(
                    getImageTypeFromNumber(
                        board[rowNumber][columnNumber].bombsAround),
                  );
                }
              }

              return InkWell(
                // Opens square
                onTap: () {
                  if (board[rowNumber][columnNumber].hasBomb) {
                    _handleGameOver();
                  }
                  if (board[rowNumber][columnNumber].bombsAround == 0) {
                    _handleTap(rowNumber, columnNumber);
                  } else {
                    setState(() {
                      openedSquares[position] = true;
                      squaresLeft = squaresLeft - 1;
                    });
                  }

                  if(squaresLeft <= bombCount) {
                    _handleWin();
                  }

                },
                // Flags square
                onLongPress: () {
                  if (openedSquares[position] == false) {
                    setState(() {
                      flaggedSquares[position] = true;
                    });
                  }
                },
                splashColor: Colors.grey,
                child: Container(
                  color: Colors.grey,
                  child: image,
                ),
              );
            },
            itemCount: rowCount * columnCount,
          ),