deb2f30b37
Just as SOURCE_CONTINUE/SOURCE_REMOVE in source functions, these constants increase code clarity over plain true/false. https://bugzilla.gnome.org/show_bug.cgi?id=719567
112 lines
3.1 KiB
JavaScript
112 lines
3.1 KiB
JavaScript
// -*- mode: js; js-indent-level: 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 Clutter = imports.gi.Clutter;
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const Params = imports.misc.params;
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const DEFAULT_LIMIT = 512;
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const HistoryManager = new Lang.Class({
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Name: 'HistoryManager',
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_init: function(params) {
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params = Params.parse(params, { gsettingsKey: null,
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limit: DEFAULT_LIMIT,
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entry: null });
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this._key = params.gsettingsKey;
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this._limit = params.limit;
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this._historyIndex = 0;
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if (this._key) {
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this._history = global.settings.get_strv(this._key);
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global.settings.connect('changed::' + this._key,
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Lang.bind(this, this._historyChanged));
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} else {
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this._history = [];
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}
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this._entry = params.entry;
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if (this._entry) {
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this._entry.connect('key-press-event',
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Lang.bind(this, this._onEntryKeyPress));
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}
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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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_setPrevItem: function(text) {
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if (this._historyIndex <= 0)
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return false;
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if (text)
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this._history[this._historyIndex] = text;
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this._historyIndex--;
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this._indexChanged();
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return true;
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},
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_setNextItem: function(text) {
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if (this._historyIndex >= this._history.length)
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return false;
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if (text)
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this._history[this._historyIndex] = text;
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this._historyIndex++;
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this._indexChanged();
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return true;
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},
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lastItem: function() {
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if (this._historyIndex != this._history.length) {
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this._historyIndex = this._history.length;
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this._indexChanged();
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}
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return this._historyIndex[this._history.length];
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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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this._historyIndex = this._history.length;
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},
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_onEntryKeyPress: function(entry, event) {
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let symbol = event.get_key_symbol();
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if (symbol == Clutter.KEY_Up) {
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return this._setPrevItem(entry.get_text());
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} else if (symbol == Clutter.KEY_Down) {
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return this._setNextItem(entry.get_text());
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}
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return Clutter.EVENT_PROPAGATE;
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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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if (this._entry)
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this._entry.set_text(current);
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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._limit);
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if (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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