From 700467f6564283fd82870e2c901b9c0444fa3030 Mon Sep 17 00:00:00 2001
From: Stenzek <stenzek@gmail.com>
Date: Sun, 1 Mar 2026 14:19:34 +1000
Subject: [PATCH] Qt: Disable 'Disable Style Sheets' button when unavailable

---
 src/duckstation-qt/interfacesettingswidget.cpp | 18 +++++++++++++-----
 src/duckstation-qt/interfacesettingswidget.h   |  2 ++
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/src/duckstation-qt/interfacesettingswidget.cpp b/src/duckstation-qt/interfacesettingswidget.cpp
index 3ab2c4b0f..7a5b1c034 100644
--- a/src/duckstation-qt/interfacesettingswidget.cpp
+++ b/src/duckstation-qt/interfacesettingswidget.cpp
@@ -111,13 +111,16 @@ InterfaceSettingsWidget::InterfaceSettingsWidget(SettingsWindow* dialog, QWidget
          "this option may cause some UI elements to not fit within windows."));
 #endif
 
-    QCheckBox* const disable_stylesheet = new QCheckBox(tr("Disable Style Sheets"), m_ui.appearanceGroup);
-    SettingWidgetBinder::BindWidgetToBoolSetting(sif, disable_stylesheet, "Main", "DisableStylesheet", false);
-    connect(disable_stylesheet, &QCheckBox::checkStateChanged, this, &QtHost::UpdateApplicationTheme);
-    m_ui.appearanceLayout->addWidget(disable_stylesheet, next_appearance_row, next_appearance_col++ * 2, 1, 2);
-    dialog->registerWidgetHelp(disable_stylesheet, tr("Disable Style Sheets"), tr("Unchecked"),
+    m_disable_style_sheets = new QCheckBox(tr("Disable Style Sheets"), m_ui.appearanceGroup);
+    SettingWidgetBinder::BindWidgetToBoolSetting(sif, m_disable_style_sheets, "Main", "DisableStylesheet", false);
+    connect(m_disable_style_sheets, &QCheckBox::checkStateChanged, this, &QtHost::UpdateApplicationTheme);
+    m_ui.appearanceLayout->addWidget(m_disable_style_sheets, next_appearance_row, next_appearance_col++ * 2, 1, 2);
+    dialog->registerWidgetHelp(m_disable_style_sheets, tr("Disable Style Sheets"), tr("Unchecked"),
                                tr("Disables the use of style sheets in the application, reverting to the original "
                                   "'Fusion' style but retaining the color scheme."));
+    connect(m_ui.theme, &QComboBox::currentIndexChanged, this,
+            &InterfaceSettingsWidget::updateDisableStyleSheetsEnabled);
+    updateDisableStyleSheetsEnabled();
 
     SettingWidgetBinder::BindWidgetToBoolSetting(sif, m_ui.autoUpdateEnabled, "AutoUpdater", "CheckAtStartup", true);
     for (const auto& [name, desc] : AutoUpdaterDialog::getChannelList())
@@ -288,6 +291,11 @@ void InterfaceSettingsWidget::onLanguageChanged()
   g_main_window->recreate();
 }
 
+void InterfaceSettingsWidget::updateDisableStyleSheetsEnabled()
+{
+  m_disable_style_sheets->setEnabled(QtHost::IsStylesheetTheme(m_ui.theme->currentData().toString().toStdString()));
+}
+
 void InterfaceSettingsWidget::checkForUpdates()
 {
   // this will return null if there's already a check in progress
diff --git a/src/duckstation-qt/interfacesettingswidget.h b/src/duckstation-qt/interfacesettingswidget.h
index 090e5804a..7406e56ad 100644
--- a/src/duckstation-qt/interfacesettingswidget.h
+++ b/src/duckstation-qt/interfacesettingswidget.h
@@ -23,9 +23,11 @@ public:
 private:
   void updateRenderToSeparateWindowOptions();
   void onLanguageChanged();
+  void updateDisableStyleSheetsEnabled();
   void checkForUpdates();
 
   Ui::InterfaceSettingsWidget m_ui;
 
   SettingsWindow* m_dialog;
+  QCheckBox* m_disable_style_sheets = nullptr;
 };