streamyard-keyboard-shortcuts.user.js

// ==UserScript==
// @name     Streamyard: Keyboard Shortcuts
// @version  1.0
// @grant    none
// @match    https://streamyard.com/*
// ==/UserScript==
//
// Copyright 2020 Michael Farrell <micolous+git@gmail.com>
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its 
//    contributors may be used to endorse or promote products derived from this
//    software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

'use strict';

(() => {
  var globalButtons = {};
  
  const keyboardShortcuts = [
    '1',
    '2',
    '3',
    '4',
    '5',
    '6',
    '7',
    '8',
    '9',
    '0',
  ];
  
  const soloButtonLabels = [
    'Solo layout',
    'Exit solo layout',
    'Fullscreen layout',
    'Exit fullscreen layout',
    'Add to stream',
  ];
  
  // Elements to ignore when doing our keypress handling.
  const ignoredElements = [
    'input',
    'textarea',
    'select',
  ];
  
  function redecorateButtons(resolve, reject) {
    var buttonsWithShortcuts = {};
    var nextButtonIdx = 0;
    const allButtons = document.getElementsByTagName('button');
    for (const button of allButtons) {
      var ariaLabel = button.attributes['aria-label'];
      if (ariaLabel === undefined) {
        continue;
      }

      ariaLabel = ariaLabel.textContent;
      if (!soloButtonLabels.includes(ariaLabel)) {
        continue;
      }

      // Probably what we want...
      // button -> LayoutButtonWrap -> CardControlRow -> CardTop -> CardWrap
      var cardWrap = button.parentElement.parentElement.parentElement.parentElement;

      if (!cardWrap.className.startsWith('Card__CardWrap-')) {
        // Not an appropriate element
        continue;
      }
      
      // Remove any existing shortcut element
      var cardNameWrap = cardWrap.children[1];
      for (const kbd of cardNameWrap.getElementsByTagName('kbd')) {
        cardNameWrap.removeChild(kbd);
      }
      
      if (nextButtonIdx >= keyboardShortcuts.length) {
        // No more shortcuts available.
        // Keep going, so we clean up remaining <kbd> elements.
        continue;
      }

      // Lets stick our keyboard shortcut in.
      var shortcut = keyboardShortcuts[nextButtonIdx++];
      
      // Create a new element
      var shortcutElement = document.createElement('kbd');
      shortcutElement.innerText = shortcut;
      shortcutElement.style.backgroundColor = 'white';
      shortcutElement.style.color = 'black';
      shortcutElement.style.fontWeight = 'bold';
      shortcutElement.style.fontSize = '20px';
      shortcutElement.style.padding = '5px';
      cardNameWrap.insertBefore(shortcutElement, cardNameWrap.firstChild);
      
      // Assign to result
      buttonsWithShortcuts[shortcut] = button;
    }

    if (Object.getOwnPropertyNames(buttonsWithShortcuts).length == 0) {
      // No buttons available :(
      reject();
    } else {
    	resolve(buttonsWithShortcuts);
    }
  }
  
  // Repeatedly look for the layout buttons.
  function lookForButtons() {    
    const p = new Promise(redecorateButtons);
    
    p.then((buttonsWithShortcuts) => {
      globalButtons = buttonsWithShortcuts;
    }).catch(() => {
      console.log('no buttons :(');
    }).finally(() => {
      // Try again in 1 second
      setTimeout(lookForButtons, 1000);
    });
  }
  
  // Handle keypress events that are not sent to a focussed element.
  function handleKeyDown(e) {
    if (ignoredElements.includes(e.target.tagName.toLowerCase())) {
      // Don't play with text boxes.
      return;
    }
    
    const button = globalButtons[e.key];
    if (button == undefined) {
      // Other key code.
      return;
    }
    
    button.click();
    e.preventDefault();
  };
  
  // Install event handler.
  document.addEventListener('keydown', handleKeyDown);
  
  // Kick off the lookForButtons loop.
  lookForButtons();
})();