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// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
/* 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";

this.EXPORTED_SYMBOLS = [ "URLBarZoom" ];

Components.utils.import("resource://gre/modules/Services.jsm");

var URLBarZoom = {

  init: function(aWindow) {
    // Register ourselves with the service so we know when the zoom prefs change.
    Services.obs.addObserver(updateZoomButton, "browser-fullZoom:zoomChange", false);
    Services.obs.addObserver(updateZoomButton, "browser-fullZoom:zoomReset", false);
    Services.obs.addObserver(updateZoomButton, "browser-fullZoom:location-change", false);
  },
}

function updateZoomButton(aSubject, aTopic) {
  let win = aSubject.ownerDocument.defaultView;
  let customizableZoomControls = win.document.getElementById("zoom-controls");
  let zoomResetButton = win.document.getElementById("urlbar-zoom-button");
  let zoomFactor = Math.round(win.ZoomManager.zoom * 100);

  // Ensure that zoom controls haven't already been added to browser in Customize Mode
  if (customizableZoomControls &&
      customizableZoomControls.getAttribute("cui-areatype") == "toolbar") {
    zoomResetButton.hidden = true;
    return;
  }
  if (zoomFactor != 100) {
    // Check if zoom button is visible and update label if it is
    if (zoomResetButton.hidden) {
      zoomResetButton.hidden = false;
    }
    // Only allow pulse animation for zoom changes, not tab switching
    if (aTopic != "browser-fullZoom:location-change") {
      zoomResetButton.setAttribute("animate", "true");
    } else {
      zoomResetButton.removeAttribute("animate");
    }
    zoomResetButton.setAttribute("label",
        win.gNavigatorBundle.getFormattedString("urlbar-zoom-button.label", [zoomFactor]));
  // Hide button if zoom is at 100%
  } else {
      zoomResetButton.hidden = true;
  }
}