gnome-shell/js/misc/history.js
Jasper St. Pierre cf3c631cde Add a history manager
runDialog and lookingGlass both implement a home-made history
manager, each working slightly differently than each other in
behavior and implementation.

Extract the behavior and implementation from runDialog, which
reads and saves to GSettings.

https://bugzilla.gnome.org/show_bug.cgi?id=642237
2011-02-19 13:28:16 -05:00

73 lines
2.0 KiB
JavaScript

/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */
const Lang = imports.lang;
const Signals = imports.signals;
const DEFAULT_LIMIT = 512;
function HistoryManager(settings_key) {
this._init(settings_key);
}
HistoryManager.prototype = {
_init: function(settings_key, limit) {
this._limit = limit || DEFAULT_LIMIT;
this._key = settings_key;
this._history = global.settings.get_strv(settings_key);
this._historyIndex = -1;
global.settings.connect('changed::' + settings_key,
Lang.bind(this, this._historyChanged));
},
_historyChanged: function() {
this._history = global.settings.get_strv(this._key);
this._historyIndex = this._history.length;
},
prevItem: function(text) {
this._setHistory(this._historyIndex--, text);
return this._indexChanged();
},
nextItem: function(text) {
this._setHistory(this._historyIndex++, text);
return this._indexChanged();
},
lastItem: function() {
this._historyIndex = this._history.length;
return this._indexChanged();
},
addItem: function(input) {
if (this._history.length == 0 ||
this._history[this._history.length - 1] != input) {
this._history.push(input);
this._save();
}
},
_indexChanged: function() {
let current = this._history[this._historyIndex] || '';
this.emit('changed', current);
return current;
},
_setHistory: function(index, text) {
this._historyIndex = Math.max(this._historyIndex, 0);
this._historyIndex = Math.min(this._historyIndex, this._history.length);
if (text)
this._history[index] = text;
},
_save: function() {
if (this._history.length > this._limit)
this._history.splice(0, this._history.length - this._key);
global.settings.set_strv(this._key, this._history);
}
};
Signals.addSignalMethods(HistoryManager.prototype);