use proper icon set and style outside of Plasma

the framework functions used will setup the proper
icon set and re-coloring and style to use

details see

https://invent.kde.org/frameworks/kiconthemes/-/issues/3

1 files changed, 25 insertions, 1 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 207a12116..6df53b62e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -22,6 +22,7 @@
 #include <KCrash>
 #include <KDBusService>
 #include <KIO/PreviewJob>
+#include <KIconTheme>
 #include <KLocalizedString>
 #include <KWindowSystem>
 
@@ -29,6 +30,11 @@
 #include <Kdelibs4ConfigMigrator>
 #endif
 
+#define HAVE_STYLE_MANAGER __has_include(<KStyleManager>)
+#if HAVE_STYLE_MANAGER
+#include <KStyleManager>
+#endif
+
 #include <QApplication>
 #include <QCommandLineParser>
 #include <QDBusConnection>
@@ -70,6 +76,13 @@ int main(int argc, char **argv)
 #endif
 
     /**
+     * trigger initialisation of proper icon theme
+     */
+#if KICONTHEMES_VERSION >= QT_VERSION_CHECK(6, 3, 0)
+    KIconTheme::initTheme();
+#endif
+
+    /**
      * enable high dpi support
      */
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
@@ -79,9 +92,20 @@ int main(int argc, char **argv)
     QApplication app(argc, argv);
     app.setWindowIcon(QIcon::fromTheme(QStringLiteral("system-file-manager"), app.windowIcon()));
 
-#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
+#if HAVE_STYLE_MANAGER
+    /**
+     * trigger initialisation of proper application style
+     */
+    KStyleManager::initStyle();
+#else
+    /**
+     * For Windows and macOS: use Breeze if available
+     * Of all tested styles that works the best for us
+     */
+#if defined(Q_OS_MACOS) || defined(Q_OS_WIN)
     QApplication::setStyle(QStringLiteral("breeze"));
 #endif
+#endif
 
     KCrash::initialize();