Окно перестает обновляться при нажатии клавиши

Всякий раз, когда я нажимаю клавишу для перемещения спрайта, экран не будет обновляться, пока я не отпущу клавишу. Единственный способ исправить это - очистить, нарисовать и отобразить окно в каждом цикле KeyPressed.

Гораздо разумнее сделать каждую из этих вещей один раз, независимо от каких-либо нажатий клавиш. Я не знаю, почему это не работает, или как лучше всего это исправить.

В приведенной ниже программе я разместил код очистки/отрисовки/отображения в нескольких разных местах, надеясь, что размещение его в нужном месте сработает. До сих пор это не так. В противном случае избыточность бессмысленна.

#include <SFML/Window.hpp>
#include <iostream>
#include <SFML/Graphics.hpp>
#include <SFML/System.hpp>

using namespace std;

int main()
{
int windowx = 800;
int windowy = 600;

float playerx = 400.0;
float playery = 300.0;

sf::Sprite playersprite;
sf::Sprite enemysprite;

float playerspeedx = 0;
float playerspeedy = 0;

float playerspeedx2 = 0;
float playerspeedy2 = 0;

float accelerationx = 50.0;
float accelerationy = 50.0;
float deccelerationx = 50.0;
float deccelerationy = 50.0;
float frictionx = 25.0;
float frictiony = 25.0;
float playermaxspeedx = 500.0;
float playermaxspeedy = 200.0;

sf::Texture hoverdrone; //player's sprite
if (!hoverdrone.loadFromFile("hoverdrone.png"))
    {
        cout << "error loading image";
    }
sf::Texture floatdrone; //for sprite enemysprite
    if (!floatdrone.loadFromFile("floatdrone.png"))
    {
        cout << "error loading image";
    }

    playersprite.setTexture(hoverdrone);
    enemysprite.setTexture(floatdrone);
    enemysprite.setPosition(sf::Vector2f(400, 400));
    playersprite.setPosition(sf::Vector2f(400, 300));


sf::RenderWindow mywindow(sf::VideoMode(windowx, windowy), "FishTank");

//sf::Clock clock; //Begin clock.
//sf::Int32 baseclock = clock.getElapsedTime().asMilliseconds();

// run the program as long as the window is open
while (mywindow.isOpen())
{
    // check all the window's events that were triggered since the last iteration of the loop
    sf::Event event;

    while (mywindow.pollEvent(event))
    {
        // "close requested" event: we close the window
        if (event.type == sf::Event::Closed)
            {
                cout <<"You have closed the window."<<endl;
                mywindow.close();
            }
        mywindow.clear(sf::Color::Black);
        mywindow.draw(playersprite);
        mywindow.draw(enemysprite);
        playersprite.setPosition(sf::Vector2f(playerx, playery));
        mywindow.display();
        sf::sleep(sf::microseconds(5));

        // left key is pressed: move our character
        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Left))
            {
                sf::Clock leftclock;

                while (sf::Keyboard::isKeyPressed(sf::Keyboard::Left))
                {
                    playerx -= 0.01; //will replace later with time based movement
                    sf::Int32 leftclock1 = leftclock.getElapsedTime().asMilliseconds();
                    cout << leftclock1 << endl;

                    /*mywindow.clear(sf::Color::Black);
                    mywindow.draw(playersprite);
                    mywindow.draw(enemysprite);
                    playersprite.setPosition(sf::Vector2f(playerx, playery));
                    mywindow.display();*/

                }

            }
        // right key is pressed: move our character
        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Right))
            {
                sf::Clock rightclock;

                while (sf::Keyboard::isKeyPressed(sf::Keyboard::Right))
                {
                    playerx += 0.01; //will replace later with time based movement
                    sf::Int32 rightclock1 = rightclock.getElapsedTime().asMilliseconds();
                    cout << rightclock1 << endl;

                    /*mywindow.clear(sf::Color::Black);
                    mywindow.draw(playersprite);
                    mywindow.draw(enemysprite);
                    playersprite.setPosition(sf::Vector2f(playerx, playery));
                    mywindow.display();*/

                }
            }
        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Up))
            {
                // up key is pressed: move our character
                //will replace later with time based movement
                (playery--);
            }
        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Down))
            {
                // down key is pressed: move our character
                // currently just resets sprite position for testing purposes
                    playerx = 400.0;
                    playery = 300.0;
            }
        if (playerx < 0) //Player cannot leave screen x left boundary
            {
                playerx = 0;
            }
        if (playerx > windowx) //Player cannot leave screen x right boundary
            {
                playerx = windowx - 10;
            }
    }
    mywindow.clear(sf::Color::Black);
    mywindow.draw(playersprite);
    mywindow.draw(enemysprite);
    playersprite.setPosition(sf::Vector2f(playerx, playery));
    mywindow.display();
    sf::sleep(sf::microseconds(5));
}
mywindow.clear(sf::Color::Black);
mywindow.draw(playersprite);
mywindow.draw(enemysprite);
playersprite.setPosition(sf::Vector2f(playerx, playery));
mywindow.display();
sf::sleep(sf::microseconds(5));
return 0;

}