From ba1428851e99cc140764ff4e1a8360bfc54052a5 Mon Sep 17 00:00:00 2001
From: Marco Allegretti <mightymarco4@gmail.com>
Date: Tue, 5 May 2026 13:30:52 +0200
Subject: [PATCH] Expose KWin titlebar button order to QML

Snap-assist needs the configured decoration button order to find the
maximize button after users move titlebar controls between sides.
---
 components/shellsettingsplugin/kwinsettings.cpp | 15 +++++++++++++++
 components/shellsettingsplugin/kwinsettings.h   | 13 +++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/components/shellsettingsplugin/kwinsettings.cpp b/components/shellsettingsplugin/kwinsettings.cpp
index 361a2188..11bd8b95 100644
--- a/components/shellsettingsplugin/kwinsettings.cpp
+++ b/components/shellsettingsplugin/kwinsettings.cpp
@@ -13,6 +13,7 @@ const QString CONFIG_FILE = QStringLiteral("kwinrc");
 const QString OVERLAY_CONFIG_FILE = QStringLiteral("plasma-mobile/kwinrc");
 const QString WAYLAND_CONFIG_GROUP = QStringLiteral("Wayland");
 const QString SCREEN_EDGES_CONFIG_GROUP = QStringLiteral("ScreenEdges");
+const QString DECORATION_CONFIG_GROUP = QStringLiteral("org.kde.kdecoration2");
 
 KWinSettings::KWinSettings(QObject *parent)
     : QObject{parent}
@@ -26,6 +27,8 @@ KWinSettings::KWinSettings(QObject *parent)
             Q_EMIT doubleTapWakeupChanged();
         } else if (group.name() == SCREEN_EDGES_CONFIG_GROUP) {
             Q_EMIT screenEdgeTouchTargetChanged();
+        } else if (group.name() == DECORATION_CONFIG_GROUP) {
+            Q_EMIT titleButtonsChanged();
         }
     });
 }
@@ -64,3 +67,15 @@ void KWinSettings::setScreenEdgeTouchTarget(int target)
         QDBusConnection::sessionBus().send(message);
     }
 }
+
+QString KWinSettings::titleButtonsOnLeft() const
+{
+    auto group = KConfigGroup{m_config, DECORATION_CONFIG_GROUP};
+    return group.readEntry("ButtonsOnLeft", QStringLiteral("MSE"));
+}
+
+QString KWinSettings::titleButtonsOnRight() const
+{
+    auto group = KConfigGroup{m_config, DECORATION_CONFIG_GROUP};
+    return group.readEntry("ButtonsOnRight", QStringLiteral("HIAX"));
+}
diff --git a/components/shellsettingsplugin/kwinsettings.h b/components/shellsettingsplugin/kwinsettings.h
index 87ab3805..8c47c010 100644
--- a/components/shellsettingsplugin/kwinsettings.h
+++ b/components/shellsettingsplugin/kwinsettings.h
@@ -20,6 +20,8 @@ class KWinSettings : public QObject
 
     Q_PROPERTY(bool doubleTapWakeup READ doubleTapWakeup WRITE setDoubleTapWakeup NOTIFY doubleTapWakeupChanged)
     Q_PROPERTY(int screenEdgeTouchTarget READ screenEdgeTouchTarget WRITE setScreenEdgeTouchTarget NOTIFY screenEdgeTouchTargetChanged)
+    Q_PROPERTY(QString titleButtonsOnLeft READ titleButtonsOnLeft NOTIFY titleButtonsChanged)
+    Q_PROPERTY(QString titleButtonsOnRight READ titleButtonsOnRight NOTIFY titleButtonsChanged)
 
 public:
     KWinSettings(QObject *parent = nullptr);
@@ -48,9 +50,20 @@ public:
      */
     void setScreenEdgeTouchTarget(int target);
 
+    /**
+     * Configured KWin titlebar buttons on the left side.
+     */
+    QString titleButtonsOnLeft() const;
+
+    /**
+     * Configured KWin titlebar buttons on the right side.
+     */
+    QString titleButtonsOnRight() const;
+
 Q_SIGNALS:
     void doubleTapWakeupChanged();
     void screenEdgeTouchTargetChanged();
+    void titleButtonsChanged();
 
 private:
     KConfigWatcher::Ptr m_configWatcher;