Move decorationHasAlpha from Client to AbstractClient

abstract_client.cpp

@@ -1311,4 +1311,13 @@ void AbstractClient::destroyDecoration()
     m_decoration = nullptr;
 }
 
+bool AbstractClient::decorationHasAlpha() const
+{
+    if (!isDecorated() || decoration()->isOpaque()) {
+        // either no decoration or decoration has alpha disabled
+        return false;
+    }
+    return true;
+}
+
 }

abstract_client.h

@@ -200,6 +200,10 @@ class KWIN_EXPORT AbstractClient : public Toplevel
      * Notify signal is emitted when the Client starts or ends move/resize mode.
      **/
     Q_PROPERTY(bool resize READ isResize NOTIFY moveResizedChanged)
+    /**
+     * Whether the decoration is currently using an alpha channel.
+     **/
+    Q_PROPERTY(bool decorationHasAlpha READ decorationHasAlpha)
 public:
     virtual ~AbstractClient();
 
@@ -491,6 +495,7 @@ public:
     bool isDecorated() const {
         return m_decoration != nullptr;
     }
+    bool decorationHasAlpha() const;
 
     // TODO: remove boolean trap
     static bool belongToSameApplication(const AbstractClient* c1, const AbstractClient* c2, bool active_hack = false);

client.cpp

@@ -2060,15 +2060,6 @@ NET::WindowType Client::windowType(bool direct, int supportedTypes) const
     return wt;
 }
 
-bool Client::decorationHasAlpha() const
-{
-    if (!isDecorated() || decoration()->isOpaque()) {
-        // either no decoration or decoration has alpha disabled
-        return false;
-    }
-    return true;
-}
-
 void Client::cancelFocusOutTimer()
 {
     if (m_focusOutTimer) {

client.h

@@ -128,10 +128,6 @@ class Client
      * Use with care!
      **/
     Q_PROPERTY(bool blocksCompositing READ isBlockingCompositing WRITE setBlockingCompositing NOTIFY blockingCompositingChanged)
-    /**
-     * Whether the decoration is currently using an alpha channel.
-     **/
-    Q_PROPERTY(bool decorationHasAlpha READ decorationHasAlpha)
     /**
      * Whether the Client uses client side window decorations.
      * Only GTK+ are detected.
@@ -358,7 +354,6 @@ public:
 
     QRect transparentRect() const;
 
-    bool decorationHasAlpha() const;
     bool isClientSideDecorated() const;
     bool wantsShadowToBeRendered() const override;