Qt: Clean up style tweaking.

qt/src/BindingPanel.cpp

@@ -12,9 +12,7 @@ BindingPanel::BindingPanel(EmuApplication *app)
 
 void BindingPanel::setTableWidget(QTableWidget *bindingTableWidget, EmuBinding *binding, int width, int height)
 {
-    QString iconset = ":/icons/blackicons/";
-    if (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark)
-        iconset = ":/icons/whiteicons/";
+    QString iconset = app->iconPrefix();
     keyboard_icon.addFile(iconset + "key.svg");
     joypad_icon.addFile(iconset + "joypad.svg");
     this->binding_table_widget = bindingTableWidget;

qt/src/ControllerPanel.cpp

@@ -6,7 +6,6 @@
 #include <optional>
 #include <QtEvents>
 #include <QTimer>
-#include <QStyleHints>
 
 ControllerPanel::ControllerPanel(EmuApplication *app)
     : BindingPanel(app)
@@ -49,7 +48,7 @@ ControllerPanel::ControllerPanel(EmuApplication *app)
     editToolButton->setMenu(&edit_menu);
     editToolButton->setPopupMode(QToolButton::InstantPopup);
 
-    QString iconset = QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark ? ":/icons/whiteicons/" : ":/icons/blackicons/";
+    QString iconset = app->iconPrefix();
     const char *icons[] = {
         "up", "down", "left", "right", "a", "b", "x", "y", "l", "r", "start", "select", "a", "b", "x", "y", "l", "r"
     };

qt/src/EmuApplication.cpp

@@ -11,6 +11,7 @@
 #include <QTimer>
 #include <QScreen>
 #include <QThread>
+#include <QStyleHints>
 #include <thread>
 #include <chrono>
 using namespace std::chrono_literals;
@@ -523,6 +524,23 @@ bool EmuApplication::isCoreActive()
     return core->active;
 }
 
+QString EmuApplication::iconPrefix()
+{
+    const char *whiteicons = ":/icons/whiteicons/";
+    const char *blackicons = ":/icons/blackicons/";
+
+    if (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark)
+        return whiteicons;
+    if (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Light)
+        return blackicons;
+
+    if (QGuiApplication::palette().color(QPalette::WindowText).lightness() >
+        QGuiApplication::palette().color(QPalette::Window).lightness())
+        return whiteicons;
+
+    return blackicons;
+}
+
 void EmuThread::runOnThread(std::function<void()> func, bool blocking)
 {
     if (QThread::currentThread() != this)

qt/src/EmuApplication.hpp

@@ -37,7 +37,7 @@ Q_OBJECT
     };
 
     int status = eDead;
-    
+
   public slots:
     void runOnThread(std::function<void()> func, bool blocking = false);
 };
@@ -82,6 +82,7 @@ struct EmuApplication
     void startThread();
     void stopThread();
     bool isCoreActive();
+    QString iconPrefix();
 
     enum Handler
     {

qt/src/EmuMainWindow.cpp

@@ -309,10 +309,7 @@ void EmuMainWindow::createWidgets()
                                               tr("&Controllers..."),
                                               tr("Shortcu&ts..."),
                                               tr("&Files...") };
-    QString iconset =
-        QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark
-            ? ":/icons/whiteicons/"
-            : ":/icons/blackicons/";
+    QString iconset = app->iconPrefix();
     const char *setting_icons[] = { "settings.svg",
                                     "display.svg",
                                     "sound.svg",

qt/src/EmuSettingsWindow.cpp

@@ -3,7 +3,6 @@
 #include "EmuConfig.hpp"
 
 #include <QScrollArea>
-#include <QStyleHints>
 #include <QWhatsThis>
 
 EmuSettingsWindow::EmuSettingsWindow(QWidget *parent, EmuApplication *app_)
@@ -46,9 +45,7 @@ EmuSettingsWindow::EmuSettingsWindow(QWidget *parent, EmuApplication *app_)
         stackedWidget->setCurrentIndex(panelList->currentRow());
     });
 
-    QString iconset = ":/icons/whiteicons/";
-    if (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Light)
-        iconset = ":/icons/blackicons/";
+    auto iconset = app->iconPrefix();
     auto icon = [iconset](QString name) -> QIcon { return QIcon(iconset + name); };
 
     panelList->item(0)->setIcon(icon("settings.svg"));

qt/src/main.cpp

@@ -3,8 +3,6 @@
 #include "EmuMainWindow.hpp"
 #include "SDLInputManager.hpp"
 
-#include <QStyle>
-#include <QStyleHints>
 #include <clocale>
 #include <qnamespace.h>
 
@@ -26,7 +24,6 @@ int main(int argc, char *argv[])
     emu.qtapp = std::make_unique<QApplication>(argc, argv);
 
     QGuiApplication::setDesktopFileName("snes9x-gtk");
-    //emu.qtapp->setStyle("fusion");
 
 #ifndef _WIN32
     auto quit_handler = [](int) { QApplication::quit(); };