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history.js
115 lines (91 loc) · 3.12 KB
/
history.js
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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
const Lang = imports.lang;
const Signals = imports.signals;
const Clutter = imports.gi.Clutter;
const Params = imports.misc.params;
const DEFAULT_LIMIT = 512;
function HistoryManager(params) {
this._init(params);
}
HistoryManager.prototype = {
_init: function(params) {
params = Params.parse(params, { gsettingsKey: null,
limit: DEFAULT_LIMIT,
entry: null });
this._key = params.gsettingsKey;
this._limit = params.limit;
this._historyIndex = 0;
if (this._key) {
this._history = global.settings.get_strv(this._key);
global.settings.connect('changed::' + this._key,
Lang.bind(this, this._historyChanged));
} else {
this._history = [];
}
this._entry = params.entry;
if (this._entry) {
this._entry.connect('key-press-event',
Lang.bind(this, this._onEntryKeyPress));
}
},
_historyChanged: function() {
this._history = global.settings.get_strv(this._key);
this._historyIndex = this._history.length;
},
prevItem: function(text) {
if (this._historyIndex <= 0)
return text;
if (text)
this._history[this._historyIndex] = text;
this._historyIndex--;
return this._indexChanged();
},
nextItem: function(text) {
if (this._historyIndex >= this._history.length)
return text;
if (text)
this._history[this._historyIndex] = text;
this._historyIndex++;
return this._indexChanged();
},
lastItem: function() {
if (this._historyIndex != this._history.length) {
this._historyIndex = this._history.length;
this._indexChanged();
}
return this._historyIndex[this._history.length];
},
addItem: function(input) {
if (this._history.length == 0 ||
this._history[this._history.length - 1] != input) {
this._history.push(input);
this._save();
}
this._historyIndex = this._history.length;
},
_onEntryKeyPress: function(entry, event) {
let symbol = event.get_key_symbol();
if (symbol == Clutter.KEY_Up) {
this.prevItem(entry.get_text());
return true;
} else if (symbol == Clutter.KEY_Down) {
this.nextItem(entry.get_text());
return true;
}
return false;
},
_indexChanged: function() {
let current = this._history[this._historyIndex] || '';
this.emit('changed', current);
if (this._entry)
this._entry.set_text(current);
return current;
},
_save: function() {
if (this._history.length > this._limit)
this._history.splice(0, this._history.length - this._limit);
if (this._key)
global.settings.set_strv(this._key, this._history);
}
};
Signals.addSignalMethods(HistoryManager.prototype);