SwingX: JXTitledPanel support (issue #22)

flatlaf-swingx/src/main/java/com/formdev/flatlaf/swingx/ui/FlatTaskPaneUI.java

@@ -84,7 +84,7 @@ public class FlatTaskPaneUI
 	public void uninstallUI( JComponent c ) {
 		if( group.getContentPane() instanceof JComponent ) {
 			// uninstall our content border, because it does not implement UIResource,
-			// to alloy other LaF to install its own border
+			// to allow other LaF to install its own border
 			JComponent content = (JComponent) group.getContentPane();
 			if( content.getBorder() instanceof FlatContentPaneBorder )
 				content.setBorder( null );

flatlaf-swingx/src/main/java/com/formdev/flatlaf/swingx/ui/FlatTitledPanelUI.java

@@ -0,0 +1,96 @@
+/*
+ * 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.ui;
+
+import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.Graphics2D;
+import java.awt.Insets;
+import java.awt.geom.Rectangle2D;
+import javax.swing.JComponent;
+import javax.swing.UIManager;
+import javax.swing.plaf.ComponentUI;
+import org.jdesktop.swingx.JXTitledPanel;
+import org.jdesktop.swingx.SwingXUtilities;
+import org.jdesktop.swingx.painter.MattePainter;
+import org.jdesktop.swingx.plaf.PainterUIResource;
+import org.jdesktop.swingx.plaf.basic.BasicTitledPanelUI;
+import com.formdev.flatlaf.ui.FlatLineBorder;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link org.jdesktop.swingx.JXTitledPanel}.
+ *
+ * @author Karl Tauber
+ */
+public class FlatTitledPanelUI
+	extends BasicTitledPanelUI
+{
+	public static ComponentUI createUI( JComponent c ) {
+		return new FlatTitledPanelUI();
+	}
+
+	@Override
+	protected void installDefaults( JXTitledPanel titledPanel ) {
+		super.installDefaults( titledPanel );
+
+		// replace gradient background
+		installProperty( titledPanel, "titlePainter", new PainterUIResource<>(
+			new TitlePainter( UIManager.getColor( "JXTitledPanel.titleBackground" ),
+				UIManager.getColor( "JXTitledPanel.borderColor" ) ) ) );
+
+		// make title bold
+		installProperty( titledPanel, "titleFont", UIManager.getFont( "JXTitledPanel.titleFont" ).deriveFont( Font.BOLD ) );
+	}
+
+	@Override
+	protected void installComponents( JXTitledPanel titledPanel ) {
+		super.installComponents( titledPanel );
+
+		if (SwingXUtilities.isUIInstallable(titledPanel.getBorder()))
+			titledPanel.setBorder( new FlatLineBorder( new Insets( 1, 1, 1, 1 ),
+				UIManager.getColor( "JXTitledPanel.borderColor" ) ) );
+	}
+
+	@Override
+	protected Insets getCaptionInsets() {
+		return UIScale.scale( super.getCaptionInsets() );
+	}
+
+	//---- class TitlePainter -------------------------------------------------
+
+	private static class TitlePainter
+		extends MattePainter
+	{
+		private final Color borderColor;
+
+		TitlePainter( Color color, Color borderColor ) {
+			super( color );
+			this.borderColor = borderColor;
+		}
+
+		@Override
+		protected void doPaint( Graphics2D g, Object component, int width, int height ) {
+			super.doPaint( g, component, width, height );
+
+			float h = scale( 1f );
+			g.setColor( borderColor );
+			g.fill( new Rectangle2D.Float( 0, height - h, width, h ) );
+		}
+	}
+}