SwingX: added SwingX LaF addon (#8)

flatlaf-swingx/src/main/java/com/formdev/flatlaf/swingx/FlatLookAndFeelAddons.java

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+/*
+ * Copyright 2019 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.swingx;
+
+import javax.swing.UIManager;
+import org.jdesktop.swingx.plaf.basic.BasicLookAndFeelAddons;
+import com.formdev.flatlaf.FlatLaf;
+
+/**
+ * SwingX LaF addon.
+ *
+ * This class is required because without this class, the system addon would be used,
+ * which may result in wrong UI defaults. (e.g. background of TaskPaneContainer)
+ *
+ * @author Karl Tauber
+ */
+public class FlatLookAndFeelAddons
+	extends BasicLookAndFeelAddons
+{
+	@Override
+	protected boolean matches() {
+		return UIManager.getLookAndFeel() instanceof FlatLaf;
+	}
+}

flatlaf-swingx/src/main/resources/META-INF/services/org.jdesktop.swingx.plaf.LookAndFeelAddons

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+com.formdev.flatlaf.swingx.FlatLookAndFeelAddons