configuration_shared: Initial functions and data for manual tristate

Sets up initial support for implementing colored tristate functions. These functions color a QWidget blue when it's overriding a global setting, and discolor it when not. The lack of color indicates it uses the global state, replacing the Qt::CheckState::PartiallyChecked state with the global state.

src/yuzu/configuration/configuration_shared.cpp

@@ -4,10 +4,15 @@
 
 #include <QCheckBox>
 #include <QComboBox>
+#include <QObject>
 #include "core/settings.h"
 #include "yuzu/configuration/configuration_shared.h"
 #include "yuzu/configuration/configure_per_game.h"
 
+namespace ConfigurationShared {
+Trackers trackers = {};
+}
+
 void ConfigurationShared::ApplyPerGameSetting(Settings::Setting<bool>* setting,
                                               const QCheckBox* checkbox) {
     if (checkbox->checkState() == Qt::PartiallyChecked) {
@@ -18,6 +23,17 @@ void ConfigurationShared::ApplyPerGameSetting(Settings::Setting<bool>* setting,
     }
 }
 
+void ConfigurationShared::ApplyPerGameSetting(Settings::Setting<bool>* setting,
+                                              const QCheckBox* checkbox,
+                                              const CheckState& tracker) {
+    if (tracker == CheckState::Global) {
+        setting->SetGlobal(true);
+    } else {
+        setting->SetGlobal(false);
+        setting->SetValue(checkbox->checkState());
+    }
+}
+
 void ConfigurationShared::ApplyPerGameSetting(Settings::Setting<int>* setting,
                                               const QComboBox* combobox) {
     if (combobox->currentIndex() == ConfigurationShared::USE_GLOBAL_INDEX) {
@@ -69,6 +85,32 @@ void ConfigurationShared::SetPerGameSetting(
                                                            ConfigurationShared::USE_GLOBAL_OFFSET);
 }
 
+void ConfigurationShared::SetBGColor(QWidget* widget, bool highlighted) {
+    if (highlighted) {
+        widget->setStyleSheet(QStringLiteral("background-color:rgba(0,203,255,0.5);"));
+    } else {
+        widget->setStyleSheet(QStringLiteral("background-color:rgba(0,0,0,0);"));
+    }
+    widget->show();
+}
+
+void ConfigurationShared::SetColoredTristate(QCheckBox* checkbox, Settings::Setting<bool>& setting,
+                                             ConfigurationShared::CheckState& tracker) {
+    if (setting.UsingGlobal()) {
+        tracker = CheckState::Global;
+    } else {
+        tracker = (setting.GetValue() == setting.GetValue(true)) ? CheckState::On : CheckState::Off;
+    }
+    SetBGColor(checkbox, tracker != CheckState::Global);
+    QObject::connect(checkbox, &QCheckBox::clicked, checkbox, [checkbox, setting, &tracker]() {
+        tracker = static_cast<ConfigurationShared::CheckState>((tracker + 1) % CheckState::Count);
+        if (tracker == CheckState::Global) {
+            checkbox->setChecked(setting.GetValue(true));
+        }
+        SetBGColor(checkbox, tracker != CheckState::Global);
+    });
+}
+
 void ConfigurationShared::InsertGlobalItem(QComboBox* combobox) {
     const QString use_global_text = ConfigurePerGame::tr("Use global configuration");
     combobox->insertItem(ConfigurationShared::USE_GLOBAL_INDEX, use_global_text);

src/yuzu/configuration/configuration_shared.h

@@ -15,8 +15,20 @@ constexpr int USE_GLOBAL_INDEX = 0;
 constexpr int USE_GLOBAL_SEPARATOR_INDEX = 1;
 constexpr int USE_GLOBAL_OFFSET = 2;
 
+enum CheckState {
+    Off,
+    On,
+    Global,
+    Count,
+};
+
+struct Trackers {
+} extern trackers;
+
 // Global-aware apply and set functions
 
+void ApplyPerGameSetting(Settings::Setting<bool>* setting, const QCheckBox* checkbox,
+                         const CheckState& tracker);
 void ApplyPerGameSetting(Settings::Setting<bool>* setting, const QCheckBox* checkbox);
 void ApplyPerGameSetting(Settings::Setting<int>* setting, const QComboBox* combobox);
 void ApplyPerGameSetting(Settings::Setting<Settings::RendererBackend>* setting,
@@ -31,6 +43,10 @@ void SetPerGameSetting(QComboBox* combobox,
 void SetPerGameSetting(QComboBox* combobox,
                        const Settings::Setting<Settings::GPUAccuracy>* setting);
 
+void SetBGColor(QWidget* widget, bool highlighted);
+void SetColoredTristate(QCheckBox* checkbox, Settings::Setting<bool>& setting,
+                        ConfigurationShared::CheckState& tracker);
+
 void InsertGlobalItem(QComboBox* combobox);
 
 } // namespace ConfigurationShared