Quelle zoom-keys.js Sprache: JAVA

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const ZOOM_PREF = "devtools.toolbox.zoomValue";
const MIN_ZOOM = 0.5;
const MAX_ZOOM = 2;

const { LocalizationHelper } = require("resource://devtools/shared/l10n.js");
const L10N = new LocalizationHelper(
  "devtools/client/locales/toolbox.properties"
);

/**
* Register generic keys to control zoom level of the given document.
* Used by both the toolboxes and the browser console.
*
* @param {DOMWindow}
*        The window on which we should listent to key strokes and modify the zoom factor.
* @param {KeyShortcuts}
*        KeyShortcuts instance where the zoom keys should be added.
*/
exports.register = function (window, shortcuts) {
  const bc = BrowsingContext.getFromWindow(window);
  let zoomValue = parseFloat(Services.prefs.getCharPref(ZOOM_PREF));
  const zoomIn = function (event) {
    setZoom(zoomValue + 0.1);
    event.preventDefault();
  };

  const zoomOut = function (event) {
    setZoom(zoomValue - 0.1);
    event.preventDefault();
  };

  const zoomReset = function (event) {
    setZoom(1);
    event.preventDefault();
  };

  const setZoom = function (newValue) {
    // cap zoom value
    zoomValue = Math.max(newValue, MIN_ZOOM);
    zoomValue = Math.min(zoomValue, MAX_ZOOM);
    // Prevent the floating-point error. (e.g. 1.1 + 0.1 = 1.2000000000000002)
    zoomValue = Math.round(zoomValue * 10) / 10;

    bc.fullZoom = zoomValue;

    Services.prefs.setCharPref(ZOOM_PREF, zoomValue);
  };

  // Set zoom to whatever the last setting was.
  setZoom(zoomValue);

  shortcuts.on(L10N.getStr("toolbox.zoomIn.key"), zoomIn);
  const zoomIn2 = L10N.getStr("toolbox.zoomIn2.key");
  if (zoomIn2) {
    shortcuts.on(zoomIn2, zoomIn);
  }

  shortcuts.on(L10N.getStr("toolbox.zoomOut.key"), zoomOut);
  const zoomOut2 = L10N.getStr("toolbox.zoomOut2.key");
  if (zoomOut2) {
    shortcuts.on(zoomOut2, zoomOut);
  }

  shortcuts.on(L10N.getStr("toolbox.zoomReset.key"), zoomReset);
  const zoomReset2 = L10N.getStr("toolbox.zoomReset2.key");
  if (zoomReset2) {
    shortcuts.on(zoomReset2, zoomReset);
  }
};

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