signal-desktop/preload.js

(function () {
  'use strict';
  console.log('preload');
  const electron = require('electron')

  window.config = require('url').parse(window.location.toString(), true).query;

  const ipc = electron.ipcRenderer
  window.config.locale_json = ipc.sendSync('locale-data');

  window.setBadgeCount = function(count) {
    ipc.send('set-badge-count', count);
  };
  /**
  * Enables spell-checking and the right-click context menu in text editors.
  * Electron (`webFrame.setSpellCheckProvider`) only underlines misspelled words;
  * we must manage the menu ourselves.
  *
  * Run this in the renderer process.
  */
  var remote = electron.remote;
  var webFrame = electron.webFrame;
  var SpellCheckProvider = require('electron-spell-check-provider');
  // `remote.require` since `Menu` is a main-process module.
  var buildEditorContextMenu = remote.require('electron-editor-context-menu');

  var selection;
  function resetSelection() {
    selection = {
      isMisspelled: false,
      spellingSuggestions: []
    };
  }
  resetSelection();

  // Reset the selection when clicking around, before the spell-checker runs and the context menu shows.
  window.addEventListener('mousedown', resetSelection);

  // The spell-checker runs when the user clicks on text and before the 'contextmenu' event fires.
  // Thus, we may retrieve spell-checking suggestions to put in the menu just before it shows.
  webFrame.setSpellCheckProvider(
    'en-US',
    // Not sure what this parameter (`autoCorrectWord`) does: https://github.com/atom/electron/issues/4371
    // The documentation for `webFrame.setSpellCheckProvider` passes `true` so we do too.
    true,
    new SpellCheckProvider('en-US').on('misspelling', function(suggestions) {
      // Prime the context menu with spelling suggestions _if_ the user has selected text. Electron
      // may sometimes re-run the spell-check provider for an outdated selection e.g. if the user
      // right-clicks some misspelled text and then an image.
      if (window.getSelection().toString()) {
        selection.isMisspelled = true;
        // Take the first three suggestions if any.
        selection.spellingSuggestions = suggestions.slice(0, 3);
      }
    }));

  window.addEventListener('contextmenu', function(e) {
    // Only show the context menu in text editors.
    if (!e.target.closest('textarea, input, [contenteditable="true"]')) return;

    var menu = buildEditorContextMenu(selection);

    // The 'contextmenu' event is emitted after 'selectionchange' has fired but possibly before the
    // visible selection has changed. Try to wait to show the menu until after that, otherwise the
    // visible selection will update after the menu dismisses and look weird.
    setTimeout(function() {
      menu.popup(remote.getCurrentWindow());
    }, 30);
  });
})();