Panel: added UI delegate

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPanelUI.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2020 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
+ *
+ *     https://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.ui;
+
+import javax.swing.JComponent;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicPanelUI;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link javax.swing.JPanel}.
+ *
+ * <!-- BasicPanelUI -->
+ *
+ * @uiDefault Panel.font				Font	unused
+ * @uiDefault Panel.background			Color	only used if opaque
+ * @uiDefault Panel.foreground			Color
+ * @uiDefault Panel.border				Border
+ *
+ * @author Karl Tauber
+ */
+public class FlatPanelUI
+	extends BasicPanelUI
+{
+	private static ComponentUI instance;
+
+	public static ComponentUI createUI( JComponent c ) {
+		if( instance == null )
+			instance = new FlatPanelUI();
+		return instance;
+	}
+}

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLaf.properties

@@ -33,6 +33,7 @@ MenuUI=com.formdev.flatlaf.ui.FlatMenuUI
 MenuBarUI=com.formdev.flatlaf.ui.FlatMenuBarUI
 MenuItemUI=com.formdev.flatlaf.ui.FlatMenuItemUI
 OptionPaneUI=com.formdev.flatlaf.ui.FlatOptionPaneUI
+PanelUI=com.formdev.flatlaf.ui.FlatPanelUI
 PasswordFieldUI=com.formdev.flatlaf.ui.FlatPasswordFieldUI
 PopupMenuUI=com.formdev.flatlaf.ui.FlatPopupMenuUI
 PopupMenuSeparatorUI=com.formdev.flatlaf.ui.FlatPopupMenuSeparatorUI