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/*
* Copyright (C) 2021 Niels De Graef <nielsdegraef@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
using Folks;
/**
* A subclass of {@link Gtk.Filter} which applies a {@link Folks.Query} as a
* filter on a list of individuals.
*
* Since {@link Folks.Query.is_match} returns a "match strength" number, you
* can specify also an (exclusive) lower bound before the filter returns true.
*/
public class Contacts.QueryFilter : Gtk.Filter {
public Query query { get; construct; }
// if this.query is a SimpleQuery, we can save the query string to enable
// some optimizations (see later)
private string query_string = "";
private uint _min_strength = 0;
public uint min_strength {
get { return this._min_strength; }
set {
if (value == this._min_strength)
return;
this._min_strength = value;
this.changed (Gtk.FilterChange.DIFFERENT);
}
}
construct {
if (this.query is SimpleQuery)
this.query_string = ((SimpleQuery) this.query).query_string;
this.query.notify.connect (on_query_notify);
}
public QueryFilter (Query query) {
Object (query: query);
}
private void on_query_notify (Object object, ParamSpec pspec) {
unowned var query = (Query) object;
// We can optimize a bit in the case of a SimpleQuery
if (query is SimpleQuery) {
// SimpleQuery notifies its locale changed on a query string update,
// even if it didn't change (and we don't support changing it either)
if (pspec.get_name () == "query-locale")
return;
// A very common use case is that the user is typing in the search bar.
// In case they add a letter, we know the filter will be more strict (and
// vice versa)
if (pspec.get_name () == "query-string") {
var old_query_str = this.query_string;
this.query_string = ((SimpleQuery) query).query_string;
// We shouldn't get a notify for this but in reality we do, so ignore it
if (this.query_string == old_query_str)
return;
}
}
this.changed (Gtk.FilterChange.DIFFERENT);
}
public override bool match (GLib.Object? item) {
unowned var individual = item as Individual;
return_val_if_fail (individual != null, false);
return this.query.is_match (individual) > this.min_strength;
}
public override Gtk.FilterMatch get_strictness () {
if (this.query is SimpleQuery &&
((SimpleQuery) query).query_string == "")
return Gtk.FilterMatch.ALL;
return Gtk.FilterMatch.SOME;
}
}
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