UI Operations History Manager, for Firefox older than its version 57.

This project is obsolete and not maintained anymore.

Usage

var OH = window['piro.sakura.ne.jp'].operationHistory;

// window specific history
OH.doOperation(
  // the operation which becomes "undo-able" (optional)
  function() {
    MyService.myProp = newValue;
  },
  // name of history (optional)
  'MyAddonFeature',
  // target window for the history (optional)
  window,
  // history entry
  { name   : 'myaddon-changeTabbar',
    label  : 'Change tabbar position',
    onUndo : function() { MyService.myProp = oldValue; },
    onRedo : function() { MyService.myProp = newValue; } }
);
OH.undo('MyAddonFeature', window);
OH.redo('MyAddonFeature', window);

// global history (not associated to window)
OH.doOperation(
  function() { ... },
  'MyAddonFeature',
  { ... }
);
OH.undo('MyAddonFeature');

// anonymous, window specific
OH.doOperation(function() { ... }, { ... }, window);
OH.undo(window);

// anonymous, global
OH.doOperation(function() { ... }, { ... });
OH.undo();

// You should use "getId()" and "getTargetById()" to get
// windows and DOM elements which are targets of operations.
var w, b, t;
OH.doOperation(
  function() {
    var tab = targetWindow.gBrowser.selectedTab;
    w = OH.getId(targetWindow);
    b = OH.getId(targetWindow.gBrowser);
    t = OH.getId(tab);
    tab.style.border = '2px solid red';
  },
  {
    id : OH.getWindowId(targetWindow),
    onUndo : function() {
      var win = OH.getTargetById(w);
      var browser = OH.getTargetById(b, win);
      var tab = OH.getTargetById(t, b.mTabContainer);
      tab.style.border = '';
    },
    onRedo : function() { ... }
  }
);

// enumerate history entries
var history = OH.getHistory('MyAddonFeature', window); // options are same to undo/redo
OH.entries.forEach(function(aEntry, aIndex) {
  var item = MyService.appendItem(aEntry.label);
  if (aIndex == history.index)
    item.setAttribute('checked', true);
});