From 3f543347b87b1ae3af9f6c5018594d03bf8da507 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Thu, 6 Sep 2018 00:01:50 +0300
Subject: [PATCH] Add language and scale settings.

---
 Telegram/Resources/langs/lang.strings         |   3 +
 Telegram/SourceFiles/boxes/language_box.cpp   |  25 +++
 Telegram/SourceFiles/boxes/language_box.h     |   3 +
 .../old_settings/settings_general_widget.cpp  |  13 +-
 .../old_settings/settings_general_widget.h    |   3 +-
 Telegram/SourceFiles/settings/settings.style  |   5 +
 .../SourceFiles/settings/settings_main.cpp    | 170 +++++++++++++++++-
 Telegram/SourceFiles/settings/settings_main.h |   5 +
 Telegram/SourceFiles/ui/rp_widget.h           |  14 +-
 Telegram/SourceFiles/ui/widgets/checkbox.cpp  |   5 +
 10 files changed, 226 insertions(+), 20 deletions(-)

diff --git a/Telegram/Resources/langs/lang.strings b/Telegram/Resources/langs/lang.strings
index b696ee4d7b..8b742b7ee9 100644
--- a/Telegram/Resources/langs/lang.strings
+++ b/Telegram/Resources/langs/lang.strings
@@ -328,6 +328,9 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_settings_bg_tile" = "Tile background";
 "lng_settings_adaptive_wide" = "Adaptive layout for wide screens";
 
+"lng_settings_language" = "Language";
+"lng_settings_default_scale" = "Default interface scale";
+
 "lng_backgrounds_header" = "Choose your new chat background";
 "lng_theme_sure_keep" = "Keep this theme?";
 "lng_theme_reverting#one" = "Reverting to the old theme in {count} second.";
diff --git a/Telegram/SourceFiles/boxes/language_box.cpp b/Telegram/SourceFiles/boxes/language_box.cpp
index c8fc3751b0..73742d8761 100644
--- a/Telegram/SourceFiles/boxes/language_box.cpp
+++ b/Telegram/SourceFiles/boxes/language_box.cpp
@@ -14,6 +14,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "boxes/confirm_box.h"
 #include "mainwidget.h"
 #include "mainwindow.h"
+#include "messenger.h"
 #include "lang/lang_instance.h"
 #include "lang/lang_cloud_manager.h"
 #include "styles/style_boxes.h"
@@ -150,3 +151,27 @@ void LanguageBox::refreshLanguages() {
 	}
 	_inner->setSelected(currentIndex);
 }
+
+base::binary_guard LanguageBox::Show() {
+	auto result = base::binary_guard();
+
+	const auto manager = Messenger::Instance().langCloudManager();
+	if (manager->languageList().isEmpty()) {
+		auto guard = std::make_shared<base::binary_guard>();
+		std::tie(result, *guard) = base::make_binary_guard();
+		auto alive = std::make_shared<std::unique_ptr<base::Subscription>>(
+			std::make_unique<base::Subscription>());
+		**alive = manager->languageListChanged().add_subscription([=] {
+			const auto show = guard->alive();
+			*alive = nullptr;
+			if (show) {
+				Ui::show(Box<LanguageBox>());
+			}
+		});
+	} else {
+		Ui::show(Box<LanguageBox>());
+	}
+	manager->requestLanguageList();
+
+	return result;
+}
diff --git a/Telegram/SourceFiles/boxes/language_box.h b/Telegram/SourceFiles/boxes/language_box.h
index 19392d3e97..23b10cfb19 100644
--- a/Telegram/SourceFiles/boxes/language_box.h
+++ b/Telegram/SourceFiles/boxes/language_box.h
@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "lang/lang_cloud_manager.h"
 #include "boxes/abstract_box.h"
 #include "mtproto/sender.h"
+#include "base/binary_guard.h"
 
 namespace Ui {
 class RadiobuttonGroup;
@@ -21,6 +22,8 @@ public:
 	LanguageBox(QWidget*) {
 	}
 
+	static base::binary_guard Show();
+
 protected:
 	void prepare() override;
 
diff --git a/Telegram/SourceFiles/old_settings/settings_general_widget.cpp b/Telegram/SourceFiles/old_settings/settings_general_widget.cpp
index 5a6c9266a4..98b3822dd0 100644
--- a/Telegram/SourceFiles/old_settings/settings_general_widget.cpp
+++ b/Telegram/SourceFiles/old_settings/settings_general_widget.cpp
@@ -220,17 +220,8 @@ void GeneralWidget::onChangeLanguage() {
 		Lang::CurrentCloudManager().switchToLanguage(qsl("custom"));
 		return;
 	}
-	auto manager = Messenger::Instance().langCloudManager();
-	if (manager->languageList().isEmpty()) {
-		_languagesLoadedSubscription = subscribe(manager->languageListChanged(), [this] {
-			unsubscribe(base::take(_languagesLoadedSubscription));
-			Ui::show(Box<LanguageBox>());
-		});
-	} else {
-		unsubscribe(base::take(_languagesLoadedSubscription));
-		Ui::show(Box<LanguageBox>());
-	}
-	manager->requestLanguageList();
+
+	_languagesLoadWaiter = LanguageBox::Show();
 }
 
 void GeneralWidget::onRestart() {
diff --git a/Telegram/SourceFiles/old_settings/settings_general_widget.h b/Telegram/SourceFiles/old_settings/settings_general_widget.h
index 082c8e2bd8..c50930ffb8 100644
--- a/Telegram/SourceFiles/old_settings/settings_general_widget.h
+++ b/Telegram/SourceFiles/old_settings/settings_general_widget.h
@@ -8,6 +8,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #pragma once
 
 #include "old_settings/settings_block_widget.h"
+#include "base/binary_guard.h"
 #include "ui/rp_widget.h"
 
 namespace OldSettings {
@@ -98,7 +99,7 @@ private:
 	Ui::SlideWrap<Ui::Checkbox> *_startMinimized = nullptr;
 	Ui::Checkbox *_addInSendTo = nullptr;
 
-	int _languagesLoadedSubscription = 0;
+	base::binary_guard _languagesLoadWaiter;
 
 };
 
diff --git a/Telegram/SourceFiles/settings/settings.style b/Telegram/SourceFiles/settings/settings.style
index 1ad80c9cf3..ac05d7ad5b 100644
--- a/Telegram/SourceFiles/settings/settings.style
+++ b/Telegram/SourceFiles/settings/settings.style
@@ -10,3 +10,8 @@ using "ui/widgets/widgets.style";
 using "info/info.style";
 
 settingsSectionButton: infoProfileButton;
+settingsSectionSkip: infoProfileSkip;
+settingsButtonRightPosition: point(28px, 10px);
+settingsButtonRight: FlatLabel(defaultFlatLabel) {
+	textFg: windowActiveTextFg;
+}
diff --git a/Telegram/SourceFiles/settings/settings_main.cpp b/Telegram/SourceFiles/settings/settings_main.cpp
index 4c6effa9f6..9ca787f69f 100644
--- a/Telegram/SourceFiles/settings/settings_main.cpp
+++ b/Telegram/SourceFiles/settings/settings_main.cpp
@@ -9,13 +9,165 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "settings/settings_common.h"
 #include "boxes/abstract_box.h"
+#include "boxes/language_box.h"
+#include "boxes/confirm_box.h"
 #include "ui/wrap/vertical_layout.h"
+#include "ui/wrap/padding_wrap.h"
+#include "ui/widgets/labels.h"
+#include "ui/widgets/discrete_sliders.h"
 #include "info/profile/info_profile_button.h"
 #include "info/profile/info_profile_cover.h"
 #include "lang/lang_keys.h"
+#include "storage/localstorage.h"
 #include "styles/style_settings.h"
 
 namespace Settings {
+namespace {
+
+void AddSkip(not_null<Ui::VerticalLayout*> container) {
+	container->add(object_ptr<Ui::FixedHeightWidget>(
+		container,
+		st::settingsSectionSkip));
+}
+
+void AddDivider(not_null<Ui::VerticalLayout*> container) {
+	container->add(object_ptr<BoxContentDivider>(container));
+}
+
+void SetupLanguageButton(not_null<Ui::VerticalLayout*> container) {
+	const auto button = container->add(object_ptr<Button>(
+		container,
+		Lang::Viewer(lng_settings_language),
+		st::settingsSectionButton));
+	const auto guard = Ui::AttachAsChild(button, base::binary_guard());
+	button->addClickHandler([=] {
+		*guard = LanguageBox::Show();
+	});
+	const auto name = Ui::CreateChild<Ui::FlatLabel>(
+		button,
+		Lang::Viewer(lng_language_name),
+		st::settingsButtonRight);
+	rpl::combine(
+		name->widthValue(),
+		button->widthValue()
+	) | rpl::start_with_next([=] {
+		name->moveToRight(
+			st::settingsButtonRightPosition.x(),
+			st::settingsButtonRightPosition.y());
+	}, name->lifetime());
+}
+
+void SetupInterfaceScale(not_null<Ui::VerticalLayout*> container) {
+	if (cRetina()) {
+		return;
+	}
+	AddDivider(container);
+	AddSkip(container);
+
+	const auto toggled = Ui::AttachAsChild(
+		container,
+		rpl::event_stream<bool>());
+
+	const auto button = container->add(object_ptr<Button>(
+		container,
+		Lang::Viewer(lng_settings_default_scale),
+		st::settingsSectionButton)
+	)->toggleOn(toggled->events_starting_with(cConfigScale() == dbisAuto));
+
+	const auto slider = container->add(
+		object_ptr<Ui::SettingsSlider>(container),
+		st::settingsSectionButton.padding);
+
+	const auto inSetScale = Ui::AttachAsChild(container, false);
+	const auto setScale = std::make_shared<Fn<void(DBIScale)>>();
+	*setScale = [=](DBIScale scale) {
+		if (*inSetScale) return;
+		*inSetScale = true;
+		const auto guard = gsl::finally([=] { *inSetScale = false; });
+
+		if (scale == cScreenScale()) {
+			scale = dbisAuto;
+		}
+		toggled->fire(scale == dbisAuto);
+		const auto applying = scale;
+		if (scale == dbisAuto) {
+			scale = cScreenScale();
+		}
+		slider->setActiveSection(scale - 1);
+
+		if (cEvalScale(scale) != cEvalScale(cRealScale())) {
+			const auto confirmed = crl::guard(button, [=] {
+				cSetConfigScale(scale);
+				Local::writeSettings();
+				App::restart();
+			});
+			const auto cancelled = crl::guard(button, [=] {
+				App::CallDelayed(
+					st::defaultSettingsSlider.duration,
+					button,
+					[=] { (*setScale)(cRealScale()); });
+			});
+			Ui::show(Box<ConfirmBox>(
+				lang(lng_settings_need_restart),
+				lang(lng_settings_restart_now),
+				confirmed,
+				cancelled));
+		} else {
+			cSetConfigScale(scale);
+			Local::writeSettings();
+		}
+	};
+	button->toggledValue(
+	) | rpl::start_with_next([=](bool checked) {
+		auto scale = checked ? dbisAuto : cEvalScale(cConfigScale());
+		if (scale == cScreenScale()) {
+			if (scale != cScale()) {
+				scale = cScale();
+			} else {
+				switch (scale) {
+				case dbisOne: scale = dbisOneAndQuarter; break;
+				case dbisOneAndQuarter: scale = dbisOne; break;
+				case dbisOneAndHalf: scale = dbisOneAndQuarter; break;
+				case dbisTwo: scale = dbisOneAndHalf; break;
+				}
+			}
+		}
+		(*setScale)(scale);
+	}, button->lifetime());
+
+	const auto label = [](DBIScale scale) {
+		switch (scale) {
+		case dbisOne: return qsl("100%");
+		case dbisOneAndQuarter: return qsl("125%");
+		case dbisOneAndHalf: return qsl("150%");
+		case dbisTwo: return qsl("200%");
+		}
+		Unexpected("Value in scale label.");
+	};
+	const auto scaleByIndex = [](int index) {
+		switch (index) {
+		case 0: return dbisOne;
+		case 1: return dbisOneAndQuarter;
+		case 2: return dbisOneAndHalf;
+		case 3: return dbisTwo;
+		}
+		Unexpected("Index in scaleByIndex.");
+	};
+
+	slider->addSection(label(dbisOne));
+	slider->addSection(label(dbisOneAndQuarter));
+	slider->addSection(label(dbisOneAndHalf));
+	slider->addSection(label(dbisTwo));
+	slider->setActiveSectionFast(cEvalScale(cConfigScale()) - 1);
+	slider->sectionActivated(
+	) | rpl::start_with_next([=](int section) {
+		(*setScale)(scaleByIndex(section));
+	}, slider->lifetime());
+
+	AddSkip(container);
+}
+
+} // namespace
 
 Main::Main(
 	QWidget *parent,
@@ -35,11 +187,19 @@ void Main::setupContent(not_null<Window::Controller*> controller) {
 		controller));
 	cover->setOnlineCount(rpl::single(0));
 
-	content->add(object_ptr<BoxContentDivider>(content));
+	setupSections(content);
+	SetupInterfaceScale(content);
+
+	Ui::ResizeFitChild(this, content);
+}
+
+void Main::setupSections(not_null<Ui::VerticalLayout*> container) {
+	AddDivider(container);
+	AddSkip(container);
 
 	const auto addSection = [&](LangKey label, Type type) {
-		content->add(object_ptr<Button>(
-			content,
+		container->add(object_ptr<Button>(
+			container,
 			Lang::Viewer(label),
 			st::settingsSectionButton)
 		)->addClickHandler([=] {
@@ -52,7 +212,9 @@ void Main::setupContent(not_null<Window::Controller*> controller) {
 	addSection(lng_settings_section_general, Type::General);
 	addSection(lng_settings_section_chat_settings, Type::Chat);
 
-	Ui::ResizeFitChild(this, content);
+	SetupLanguageButton(container);
+
+	AddSkip(container);
 }
 
 rpl::producer<Type> Main::sectionShowOther() {
diff --git a/Telegram/SourceFiles/settings/settings_main.h b/Telegram/SourceFiles/settings/settings_main.h
index 98a6eef656..da4c036875 100644
--- a/Telegram/SourceFiles/settings/settings_main.h
+++ b/Telegram/SourceFiles/settings/settings_main.h
@@ -13,6 +13,10 @@ namespace Window {
 class Controller;
 } // namespace Window
 
+namespace Ui {
+class VerticalLayout;
+} // namespace Ui
+
 namespace Settings {
 
 class Main : public Section {
@@ -26,6 +30,7 @@ public:
 
 private:
 	void setupContent(not_null<Window::Controller*> controller);
+	void setupSections(not_null<Ui::VerticalLayout*> container);
 
 	not_null<UserData*> _self;
 	rpl::event_stream<Type> _showOther;
diff --git a/Telegram/SourceFiles/ui/rp_widget.h b/Telegram/SourceFiles/ui/rp_widget.h
index 6e25cf1f9c..33f1747cd6 100644
--- a/Telegram/SourceFiles/ui/rp_widget.h
+++ b/Telegram/SourceFiles/ui/rp_widget.h
@@ -24,6 +24,10 @@ public:
 	, _value(std::forward<OtherValue>(value)) {
 	}
 
+	not_null<Value*> value() {
+		return &_value;
+	}
+
 private:
 	Value _value;
 
@@ -57,11 +61,13 @@ void ResizeFitChild(
 	not_null<RpWidget*> child);
 
 template <typename Value>
-inline void AttachAsChild(not_null<QObject*> parent, Value &&value) {
-	using PlainValue = std::decay_t<Value>;
-	CreateChild<details::AttachmentOwner<PlainValue>>(
+inline not_null<std::decay_t<Value>*> AttachAsChild(
+		not_null<QObject*> parent,
+		Value &&value) {
+	return CreateChild<details::AttachmentOwner<std::decay_t<Value>>>(
 		parent.get(),
-		std::forward<Value>(value));
+		std::forward<Value>(value)
+	)->value();
 }
 
 template <typename Widget>
diff --git a/Telegram/SourceFiles/ui/widgets/checkbox.cpp b/Telegram/SourceFiles/ui/widgets/checkbox.cpp
index 6b46f007e0..552d52892c 100644
--- a/Telegram/SourceFiles/ui/widgets/checkbox.cpp
+++ b/Telegram/SourceFiles/ui/widgets/checkbox.cpp
@@ -29,11 +29,15 @@ AbstractCheckView::AbstractCheckView(int duration, bool checked, Fn<void()> upda
 }
 
 void AbstractCheckView::setCheckedFast(bool checked) {
+	const auto fire = (_checked != checked);
 	_checked = checked;
 	finishAnimating();
 	if (_updateCallback) {
 		_updateCallback();
 	}
+	if (fire) {
+		_checks.fire_copy(_checked);
+	}
 }
 
 void AbstractCheckView::setUpdateCallback(Fn<void()> updateCallback) {
@@ -53,6 +57,7 @@ void AbstractCheckView::setCheckedAnimated(bool checked) {
 	if (_checked != checked) {
 		_checked = checked;
 		_toggleAnimation.start(_updateCallback, _checked ? 0. : 1., _checked ? 1. : 0., _duration);
+		_checks.fire_copy(_checked);
 	}
 }