// mainwindow.h
private:
int gameData[4][4];

public:
int getGameData(int x, int y);
int setGameData(int x, int y, int val);

// mainwindow.cpp
void MainWindow::moveLeft(){

bool move = false;

// Сдвиг в влево
for(int x =0; x<4; x++){
    for(int y=0; y<4; y++){
        if(MainWindow::getGameData(x, y) == 0){
            for (int i = y; i < 4; i++){
                if(MainWindow::getGameData(x, i) != 0){
                    MainWindow::setGameData(x, y, MainWindow::getGameData(x, i));
                    MainWindow::setGameData(x, i, 0);
                    move = true;
                    break;
                }
            }
        }
    }
}

for(int x = 0; x<4; x++){
    for(int y = 0; y<3; y++){
        if(MainWindow::getGameData(x, y) == MainWindow::getGameData(x, y+1)){
            MainWindow::setGameData(x, y, MainWindow::getGameData(x, y)*2);
            MainWindow::scoreValuePlus(MainWindow::getGameData(x, y));
            MainWindow::setGameData(x, y+1, 0);
            move = true;
        }

        for(int x =0; x<4; x++){
            for(int y=0; y<4; y++){
                if(MainWindow::getGameData(x, y) == 0){
                    for (int i = y; i < 4; i++){
                        if(MainWindow::getGameData(x, i) != 0){
                            MainWindow::setGameData(x, y, MainWindow::getGameData(x, i));
                            MainWindow::setGameData(x, i, 0);
                            break;
                        }
                    }
                }
            }
        }

        if(MainWindow::getGameData(x, y) == 0){
            ui->gameGrid->item(x, y)->setData(Qt::DisplayRole, QVariant(""));;
        }
        else {
            ui->gameGrid->item(x, y)->setData(Qt::DisplayRole, QVariant(MainWindow::getGameData(x, y)));
        }
    }
}

if(move == true){
    MainWindow::generateCell(true);
    MainWindow::moveValuePlus();
}