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Serenity Operating System
1/*
2 * Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include "TimeZoneSettingsWidget.h"
8#include <AK/Time.h>
9#include <Applications/ClockSettings/TimeZoneSettingsWidgetGML.h>
10#include <LibGUI/ComboBox.h>
11#include <LibGUI/Event.h>
12#include <LibGUI/ImageWidget.h>
13#include <LibGUI/ItemListModel.h>
14#include <LibGUI/Label.h>
15#include <LibGUI/Layout.h>
16#include <LibGUI/Margins.h>
17#include <LibGUI/Painter.h>
18#include <LibGUI/Process.h>
19#include <LibGfx/Palette.h>
20#include <LibLocale/DateTimeFormat.h>
21#include <LibLocale/Locale.h>
22#include <LibTimeZone/TimeZone.h>
23#include <math.h>
24#include <spawn.h>
25#include <unistd.h>
26
27using StringViewListModel = GUI::ItemListModel<StringView, ReadonlySpan<StringView>>;
28
29static constexpr auto PI_OVER_180 = M_PIf32 / 180.0f;
30static constexpr auto PI_OVER_4 = M_PIf32 / 4.0f;
31static constexpr auto TAU = M_PIf32 * 2.0f;
32
33// The map as stored on disk is a valid Mercadian projected map. But it has quite a bit of dead space that
34// we can remove. This makes the map non-Mercadian, so we need to adjust our math based on what we removed.
35static constexpr auto TIME_ZONE_MAP_NORTHERN_TRIM = 78;
36static constexpr auto TIME_ZONE_MAP_SOUTHERN_TRIM = 50;
37
38static constexpr auto TIME_ZONE_TEXT_WIDTH = 210;
39static constexpr auto TIME_ZONE_TEXT_HEIGHT = 40;
40static constexpr auto TIME_ZONE_TEXT_PADDING = 5;
41static constexpr auto TIME_ZONE_TEXT_COLOR = Gfx::Color::from_rgb(0xeaf688);
42
43ErrorOr<NonnullRefPtr<TimeZoneSettingsWidget>> TimeZoneSettingsWidget::create()
44{
45 auto timezonesettings_widget = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) TimeZoneSettingsWidget));
46
47 auto time_zone_map_bitmap = TRY(Gfx::Bitmap::load_from_file("/res/graphics/map.png"sv));
48 auto time_zone_rect = time_zone_map_bitmap->rect().shrunken(TIME_ZONE_MAP_NORTHERN_TRIM, 0, TIME_ZONE_MAP_SOUTHERN_TRIM, 0);
49 time_zone_map_bitmap = TRY(time_zone_map_bitmap->cropped(time_zone_rect));
50
51 timezonesettings_widget->m_time_zone_map = *timezonesettings_widget->find_descendant_of_type_named<GUI::ImageWidget>("time_zone_map");
52 timezonesettings_widget->m_time_zone_map->set_bitmap(time_zone_map_bitmap);
53
54 auto time_zone_marker = TRY(Gfx::Bitmap::load_from_file("/res/icons/32x32/ladyball.png"sv));
55 timezonesettings_widget->m_time_zone_marker = TRY(time_zone_marker->scaled(0.75f, 0.75f));
56
57 timezonesettings_widget->set_time_zone_location();
58
59 return timezonesettings_widget;
60}
61
62TimeZoneSettingsWidget::TimeZoneSettingsWidget()
63{
64 load_from_gml(time_zone_settings_widget_gml).release_value_but_fixme_should_propagate_errors();
65
66 static auto time_zones = TimeZone::all_time_zones();
67 m_time_zone = TimeZone::system_time_zone();
68
69 m_time_zone_combo_box = *find_descendant_of_type_named<GUI::ComboBox>("time_zone_input");
70 m_time_zone_combo_box->set_only_allow_values_from_model(true);
71 m_time_zone_combo_box->set_model(*StringViewListModel::create(time_zones));
72 m_time_zone_combo_box->set_text(m_time_zone);
73 m_time_zone_combo_box->on_change = [&](auto, auto) {
74 set_modified(true);
75 };
76}
77
78void TimeZoneSettingsWidget::second_paint_event(GUI::PaintEvent& event)
79{
80 GUI::Widget::second_paint_event(event);
81
82 if (!m_time_zone_location.has_value())
83 return;
84
85 GUI::Painter painter(*this);
86 painter.add_clip_rect(event.rect());
87 painter.add_clip_rect(m_time_zone_map->relative_rect());
88
89 auto x = m_time_zone_map->x() + m_time_zone_map->parent_widget()->layout()->margins().left();
90 auto y = m_time_zone_map->y() + m_time_zone_map->parent_widget()->layout()->margins().top();
91
92 auto point = m_time_zone_location->to_type<int>().translated(x, y);
93 point.translate_by(-m_time_zone_marker->width() / 2, -m_time_zone_marker->height() / 2);
94 painter.blit(point, *m_time_zone_marker, rect());
95
96 point = m_time_zone_location->to_type<int>().translated(x, y);
97 point.translate_by(0, -TIME_ZONE_TEXT_HEIGHT / 2);
98
99 if (point.x() <= (m_time_zone_map->width() / 2))
100 point.translate_by(m_time_zone_marker->width() / 2 + TIME_ZONE_TEXT_PADDING, 0);
101 else
102 point.translate_by(-m_time_zone_marker->width() / 2 - TIME_ZONE_TEXT_PADDING - TIME_ZONE_TEXT_WIDTH, 0);
103
104 auto text_area = Gfx::IntRect { point.x(), point.y(), TIME_ZONE_TEXT_WIDTH, TIME_ZONE_TEXT_HEIGHT };
105 painter.draw_rect(text_area, palette().active_window_border1());
106
107 text_area.shrink(2, 2);
108 painter.fill_rect(text_area, TIME_ZONE_TEXT_COLOR);
109 painter.draw_text(text_area, m_time_zone_text, Gfx::TextAlignment::Center);
110}
111
112void TimeZoneSettingsWidget::reset_default_values()
113{
114 m_time_zone = "UTC"sv;
115 m_time_zone_combo_box->set_text(m_time_zone);
116 m_time_zone_location.clear();
117
118 set_time_zone();
119 update();
120}
121
122void TimeZoneSettingsWidget::apply_settings()
123{
124 m_time_zone = m_time_zone_combo_box->text();
125
126 set_time_zone_location();
127 set_time_zone();
128 update();
129}
130
131void TimeZoneSettingsWidget::set_time_zone_location()
132{
133 m_time_zone_location = compute_time_zone_location();
134
135 auto locale = Locale::default_locale();
136 auto now = AK::Time::now_realtime();
137
138 auto name = Locale::format_time_zone(locale, m_time_zone, Locale::CalendarPatternStyle::Long, now).release_value_but_fixme_should_propagate_errors();
139 auto offset = Locale::format_time_zone(locale, m_time_zone, Locale::CalendarPatternStyle::LongOffset, now).release_value_but_fixme_should_propagate_errors();
140
141 m_time_zone_text = DeprecatedString::formatted("{}\n({})", name, offset);
142}
143
144// https://en.wikipedia.org/wiki/Mercator_projection#Derivation
145Optional<Gfx::FloatPoint> TimeZoneSettingsWidget::compute_time_zone_location() const
146{
147 auto location = TimeZone::get_time_zone_location(m_time_zone);
148 if (!location.has_value())
149 return {};
150
151 auto latitude = location->latitude.decimal_coordinate();
152 auto longitude = location->longitude.decimal_coordinate();
153
154 auto rect = m_time_zone_map->bitmap()->rect().to_type<float>();
155
156 latitude = logf(tanf(PI_OVER_4 + (latitude * PI_OVER_180 / 2.0f)));
157
158 auto mercadian_x = (longitude + 180.0f) * (rect.width() / 360.0f);
159 auto mercadian_y = (rect.height() / 2.0f) - (rect.width() * latitude / TAU);
160
161 mercadian_y -= TIME_ZONE_MAP_NORTHERN_TRIM / 2;
162 mercadian_y += TIME_ZONE_MAP_SOUTHERN_TRIM / 2;
163
164 return Gfx::FloatPoint { mercadian_x, mercadian_y };
165}
166
167void TimeZoneSettingsWidget::set_time_zone()
168{
169 GUI::Process::spawn_or_show_error(window(), "/bin/timezone"sv, Array { m_time_zone.characters() });
170}