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