Cómo usar varias pantallas

Palances Liao
Palances Liao
Thomas Steiner

El método moderno

Usa window.getScreenDetails()

Para asegurarte de que tu navegador admita el método getScreenDetails(), primero verifica si existe en el objeto window. Luego, llama a window.getScreenDetails() para obtener las pantallas adjuntas. Agregar un objeto de escucha de eventos para adaptarse a los detalles de la pantalla modificados te permite administrar varias pantallas según las necesidades de tu app.

if ('getScreenDetails' in window) {
  // The Window Management API is supported.
  const screenDetails = await window.getScreenDetails();
  screenDetails.addEventListener('screenschange', (event) => {
    // Handle screens change.
  });
}

Browser Support

  • Chrome: 100.
  • Edge: 100.
  • Firefox: not supported.
  • Safari: not supported.

Source

El método clásico

Usa el método window.screen

No hay una forma clásica de controlar los diseños de varias pantallas, pero puedes volver a controlar la pantalla actual con la propiedad window.screen y el polyfill de la nueva forma de API.

if (!('getScreenDetails' in window)) {
  // Returning a one-element array with the current screen,
  // noting that there might be more.
  window.getScreenDetails = async () => [window.screen];
  // Set to `false`, noting that this might be a lie.
  window.screen.isExtended = false;
}

Browser Support

  • Chrome: 1.
  • Edge: 12.
  • Firefox: 1.
  • Safari: 1.

Source

Mejora progresiva

En la siguiente demostración, se muestra cómo puedes controlar varias pantallas con la API de Window Management. El código primero verifica la capacidad del navegador y, luego, vuelve al método clásico.

const detectButton = document.querySelector('#detectScreen');
const createButton = document.querySelector('#create');
const permissionLabel = document.querySelector('#permissionStatus');
const screensAvailLabel = document.querySelector('#screensAvail');
const popupUrl = './popup.html';
let screenDetails = undefined;
let permission = undefined;
let currentScreenLength = undefined;

detectButton.addEventListener('click', async () => {
  if ('getScreenDetails' in window) {
    screenDetails = await window.getScreenDetails();
    screenDetails.addEventListener('screenschange', (event) => {
      if (screenDetails.screens.length !== currentScreenLength) {
        currentScreenLength = screenDetails.screens.length;
        updateScreenInfo();
      }
    });
    try {
      permission =
        (await navigator.permissions.query({ name: 'window-management' })).state === 'granted'
          ? 'Granted'
          : 'No Permission';
    } catch (err) {
      console.error(err);
    }
    currentScreenLength = screenDetails.screens.length;
    updateScreenInfo();
  } else {
    screenDetails = window.screen;
    permission = 'Window Management API - NOT SUPPORTED';
    currentScreenLength = 1;
    updateScreenInfo();
  }
});

createButton.addEventListener('click', () => {
  let screen = screenDetails.screens[Math.floor(Math.random() * currentScreenLength)];
  options = {
    x: screen.availLeft,
    y: screen.availTop,
    width: screen.availWidth,
    height: screen.availHeight,
  };
  window.open(popupUrl, '_blank', getFeaturesFromOptions(options));
});

function getFeaturesFromOptions(options) {
  return (
    'left=' +
    options.x +
    ',top=' +
    options.y +
    ',width=' +
    options.width +
    ',height=' +
    options.height
  );
}

updateScreenInfo = () => {
  screensAvailLabel.innerHTML = currentScreenLength;
  permissionLabel.innerHTML = permission;
  if ('getScreenDetails' in window && screenDetails.screens.length >= 1) {
    createButton.disabled = false;
  } else {
    createButton.disabled = true;
  }
};

Lecturas adicionales

Demostración

HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link
      rel="icon"
      href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🎉</text></svg>"
    />
    <title>How to use multiple screens</title>
    <link rel="stylesheet" href="/style.css" />
    <!-- TODO: Devsite - Removed inline handlers -->
    <!-- <script src="/script.js" type="module"></script> -->
  </head>
  <body>
    <h1>How to use multiple screens</h1>
    <div>
      <div>
        Permission Status:
        <span id="permissionStatus"></span>
      </div>
      <div>Screens Available: <span id="screensAvail"></span></div>
    </div>
    <button id="detectScreen">Detect Screens</button>
    <button id="create" disabled>Create Page On Random Screen</button>
  </body>
</html>

CSS


        :root {
  color-scheme: dark light;
}

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

body {
  margin: 1rem;
  font-family: system-ui, sans-serif;
}

JS


        const detectButton = document.querySelector('#detectScreen');
const createButton = document.querySelector('#create');
const permissionLabel = document.querySelector('#permissionStatus');
const screensAvailLabel = document.querySelector('#screensAvail');
const popupUrl = 'supporting-popup.html';
let screenDetails = undefined;
let permission = undefined;
let currentScreenLength = undefined;

detectButton.addEventListener('click', async () => {
  if ('getScreenDetails' in window) {
    screenDetails = await window.getScreenDetails();
    screenDetails.addEventListener('screenschange', (event) => {
      if (screenDetails.screens.length !== currentScreenLength) {
        currentScreenLength = screenDetails.screens.length;
        updateScreenInfo();
      }
    });
    try {
      permission =
        (await navigator.permissions.query({ name: 'window-placement' }))
          .state === 'granted'
          ? 'Granted'
          : 'No Permission';
    } catch (err) {
      console.error(err);
    }
    currentScreenLength = screenDetails.screens.length;
    updateScreenInfo();
  } else {
    screenDetails = window.screen;
    permission = 'Multi-Screen Window Placement API - NOT SUPPORTED';
    currentScreenLength = 1;
    updateScreenInfo();
  }
});

createButton.addEventListener('click', () => {
  const screen =
    screenDetails.screens[Math.floor(Math.random() * currentScreenLength)];
  const options = {
    x: screen.availLeft,
    y: screen.availTop,
    width: screen.availWidth,
    height: screen.availHeight,
  };
  window.open(popupUrl, '_blank', getFeaturesFromOptions(options));
});

const getFeaturesFromOptions = (options) => {
  return (
    'left=' +
    options.x +
    ',top=' +
    options.y +
    ',width=' +
    options.width +
    ',height=' +
    options.height
  );
};

const updateScreenInfo = () => {
  screensAvailLabel.innerHTML = currentScreenLength;
  permissionLabel.innerHTML = permission;
  if ('getScreenDetails' in window && screenDetails.screens.length > 1) {
    createButton.disabled = false;
  } else {
    createButton.disabled = true;
  }
};