YouTube Volume Control with Memory

Set YouTube volume manually on a scale of 1-100, remember last set volume, and inject the UI to the left of the volume slider on the video player. Syncs the slider, disables invalid inputs, and adds debugging.
目前为 2024-11-25 提交的版本。查看最新版本。
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// ==UserScript==
// @name         YouTube Volume Control with Memory
// @namespace    https://github.com/Nick2bad4u/UserStyles
// @version      4.0
// @description  Set YouTube volume manually on a scale of 1-100, remember last set volume, and inject the UI to the left of the volume slider on the video player. Syncs the slider, disables invalid inputs, and adds debugging.
// @author       Nick2bad4u
// @match        *://www.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        GM.getValue
// @grant        GM.setValue
// @license      UnLicense
// @tag          youtube
// ==/UserScript==

(async function () {
  'use strict';

  // Default volume if none is saved
  let previousVolume = await GM.getValue('youtubeVolume', 5);

  // Create input element for volume control
  const volumeInput = document.createElement('input');
  volumeInput.type = 'number';
  volumeInput.min = 0;
  volumeInput.max = 100;
  volumeInput.value = previousVolume;

  // Set input field styles to resemble YouTube's UI
  volumeInput.style.width = '30px';
  volumeInput.style.marginRight = '10px';
  volumeInput.style.backgroundColor = 'rgba(255, 255, 255, 0.0)';
  volumeInput.style.color = 'white';
  volumeInput.style.border = '0px solid rgba(255, 255, 255, 0.0)';
  volumeInput.style.borderRadius = '4px';
  volumeInput.style.zIndex = 9999;
  volumeInput.style.height = '24px';
  volumeInput.style.fontSize = '16px';
  volumeInput.style.padding = '0 4px';
  volumeInput.style.transition = 'border-color 0.3s, background-color 0.3s';
  volumeInput.style.outline = 'none';
  volumeInput.style.position = 'relative';
  volumeInput.style.top = '13px';

  // Change border color on focus
  volumeInput.addEventListener('focus', () => {
    volumeInput.style.borderColor = 'rgba(255, 255, 255, 0.6)';
  });

  volumeInput.addEventListener('blur', () => {
    volumeInput.style.borderColor = 'rgba(255, 255, 255, 0.3)';
  });

  // Change background color on hover
  volumeInput.addEventListener('mouseenter', () => {
    volumeInput.style.backgroundColor = 'rgba(0, 0, 0, 0.8)';
  });

  volumeInput.addEventListener('mouseleave', () => {
    volumeInput.style.backgroundColor = 'rgba(255, 255, 255, 0.0)';
  });

  // Prevent YouTube hotkeys when typing in the input
  volumeInput.addEventListener('keydown', function (event) {
    event.stopPropagation();
    console.log('Keydown event in volume input, stopping propagation.');
  });

  // Function to set the volume based on input value
  async function setVolume(volumeValue) {
    const player = document.querySelector('video');
    if (player) {
      // Validate input (must be between 0 and 100)
      if (volumeValue < 0) volumeValue = 0;
      if (volumeValue > 100) volumeValue = 100;
      volumeInput.value = volumeValue;

      // Set the player volume and save to Tampermonkey storage
      player.volume = volumeValue / 100;
      await GM.setValue('youtubeVolume', volumeValue);
      console.log(`Volume set to ${volumeValue} and saved to Tampermonkey storage.`);

      // Sync YouTube's volume slider UI
      const volumeSlider = document.querySelector('.ytp-volume-slider-handle');
      if (volumeSlider) {
        volumeSlider.style.left = `${volumeValue}%`;
        console.log('YouTube volume slider updated.');
      }
    }
  }

  // Event listener for input change (manually changing the volume in the input box)
  volumeInput.addEventListener('input', () => setVolume(volumeInput.value));

  // Function to update the input field when YouTube's player volume is changed
  async function updateVolumeInput() {
    const player = document.querySelector('video');
    if (player) {
      const currentVolume = Math.round(player.volume * 100);
      volumeInput.value = currentVolume;
      await GM.setValue('youtubeVolume', currentVolume);
      console.log(`Volume input updated to ${currentVolume} from video player.`);

      // Show 0 if the video is muted
      if (player.muted) {
        volumeInput.value = 0;
      }
    }
  }

  // Function to handle mute changes
  async function handleMuteChange() {
    const player = document.querySelector('video');
    if (player) {
      if (player.muted) {
        volumeInput.value = 0; // Show 0 when muted
      } else {
        volumeInput.value = previousVolume; // Restore previous volume when unmuted
        player.volume = previousVolume / 100; // Set the player volume back to previous
      }
      console.log(`Mute state changed: muted = ${player.muted}`);
    }
  }

  // Inject the input box into YouTube's control bar
  function injectVolumeControl() {
    const volumeSliderPanel = document.querySelector('.ytp-volume-panel');
    if (volumeSliderPanel) {
      volumeSliderPanel.parentNode.insertBefore(volumeInput, volumeSliderPanel);
      setVolume(previousVolume); // Set initial volume
      const player = document.querySelector('video');
      if (player) {
        player.addEventListener('volumechange', updateVolumeInput);
        player.addEventListener('mute', handleMuteChange);
        player.addEventListener('unmute', handleMuteChange);
        console.log('Volume input injected and event listeners attached.');
      }
    } else {
      console.log('Volume panel not found, retrying...');
      setTimeout(injectVolumeControl, 500);
    }
  }

  // Inject the volume control when the page is ready
  injectVolumeControl();
})();
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