8362095: HeaderButtonMetrics should not be used across toolkit boundary

modules/javafx.graphics/src/main/java/com/sun/glass/ui/HeaderButtonMetrics.java

@@ -26,7 +26,6 @@
 package com.sun.glass.ui;
 
 import javafx.geometry.Dimension2D;
-import javafx.scene.layout.HeaderBar;
 import javafx.stage.StageStyle;
 import java.util.Objects;
 
@@ -37,7 +36,6 @@
  * @param rightInset the size of the right inset
  * @param minHeight the minimum height of the window buttons
  * @see HeaderButtonOverlay
- * @see HeaderBar
  */
 public record HeaderButtonMetrics(Dimension2D leftInset, Dimension2D rightInset, double minHeight) {
 

modules/javafx.graphics/src/main/java/com/sun/javafx/stage/HeaderButtonMetrics.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.javafx.stage;
+
+import javafx.geometry.Dimension2D;
+import javafx.scene.layout.HeaderBar;
+import javafx.stage.StageStyle;
+import java.util.Objects;
+
+/**
+ * Provides metrics about the header buttons of {@link StageStyle#EXTENDED} windows.
+ *
+ * @param leftInset the size of the left inset
+ * @param rightInset the size of the right inset
+ * @param minHeight the minimum height of the window buttons
+ * @see HeaderBar
+ */
+public record HeaderButtonMetrics(Dimension2D leftInset, Dimension2D rightInset, double minHeight) {
+
+    public HeaderButtonMetrics {
+        Objects.requireNonNull(leftInset);
+        Objects.requireNonNull(rightInset);
+
+        if (minHeight < 0) {
+            throw new IllegalArgumentException("minHeight cannot be negative");
+        }
+    }
+}

modules/javafx.graphics/src/main/java/com/sun/javafx/stage/StageHelper.java

@@ -25,7 +25,6 @@
 
 package com.sun.javafx.stage;
 
-import com.sun.glass.ui.HeaderButtonMetrics;
 import com.sun.javafx.util.Utils;
 import javafx.beans.value.ObservableValue;
 import javafx.stage.Stage;

modules/javafx.graphics/src/main/java/com/sun/javafx/stage/StagePeerListener.java

@@ -25,10 +25,8 @@
 
 package com.sun.javafx.stage;
 
-import com.sun.glass.ui.HeaderButtonMetrics;
 import javafx.stage.Stage;
 
-
 public class StagePeerListener extends WindowPeerListener {
     private final Stage stage;
     private final StageAccessor stageAccessor;

modules/javafx.graphics/src/main/java/com/sun/javafx/tk/quantum/WindowStage.java

@@ -42,6 +42,7 @@
 import com.sun.javafx.PlatformUtil;
 import com.sun.javafx.iio.common.PushbroomScaler;
 import com.sun.javafx.iio.common.ScalerFactory;
+import com.sun.javafx.stage.HeaderButtonMetrics;
 import com.sun.javafx.stage.StagePeerListener;
 import com.sun.javafx.tk.FocusCause;
 import com.sun.javafx.tk.TKScene;
@@ -227,7 +228,9 @@ private void computeAndSetBackground(List<javafx.scene.paint.Stop> stops) {
 
     private void notifyHeaderButtonMetricsChanged() {
         if (stageListener instanceof StagePeerListener listener && platformWindow != null) {
-            listener.changedHeaderButtonMetrics(platformWindow.headerButtonMetricsProperty().get());
+            var metrics = platformWindow.headerButtonMetricsProperty().get();
+            listener.changedHeaderButtonMetrics(
+                new HeaderButtonMetrics(metrics.leftInset(), metrics.rightInset(), metrics.minHeight()));
         }
     }
 

modules/javafx.graphics/src/main/java/javafx/scene/layout/HeaderBar.java

@@ -25,10 +25,10 @@
 
 package javafx.scene.layout;
 
-import com.sun.glass.ui.HeaderButtonMetrics;
 import com.sun.javafx.PreviewFeature;
 import com.sun.javafx.geom.Vec2d;
 import com.sun.javafx.scene.layout.HeaderButtonBehavior;
+import com.sun.javafx.stage.HeaderButtonMetrics;
 import com.sun.javafx.stage.StageHelper;
 import javafx.beans.property.BooleanProperty;
 import javafx.beans.property.BooleanPropertyBase;

modules/javafx.graphics/src/main/java/javafx/stage/Stage.java

@@ -41,11 +41,11 @@
 import javafx.scene.input.KeyCombination;
 import javafx.scene.layout.HeaderBar;
 
-import com.sun.glass.ui.HeaderButtonMetrics;
 import com.sun.javafx.PreviewFeature;
 import com.sun.javafx.collections.VetoableListDecorator;
 import com.sun.javafx.collections.TrackableObservableList;
 import com.sun.javafx.scene.SceneHelper;
+import com.sun.javafx.stage.HeaderButtonMetrics;
 import com.sun.javafx.stage.StageHelper;
 import com.sun.javafx.stage.StagePeerListener;
 import com.sun.javafx.tk.TKStage;