CheckBox and RadioButton: Opaque flag is no longer ignored when checkbox is used as table cell renderer (issue #77)

this fix replaces/improves fix made in commit 3ba8133890

CHANGELOG.md

@@ -10,6 +10,8 @@ FlatLaf Change Log
   (e.g. 1000).
 - Added Java 9 module descriptor to `flatlaf-extras-<version>.jar` and
   `flatlaf-swingx-<version>.jar`.
+- CheckBox and RadioButton: Flag `opaque` is no longer ignored when checkbox or
+  radio button is used as table cell renderer. (issue #77)
 
 
 ## 0.34

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

@@ -23,7 +23,6 @@ import java.awt.Graphics;
 import java.awt.Insets;
 import java.awt.Rectangle;
 import javax.swing.AbstractButton;
-import javax.swing.CellRendererPane;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
@@ -122,11 +121,10 @@ public class FlatRadioButtonUI
 	public void paint( Graphics g, JComponent c ) {
 		// fill background even if not opaque if
 		// - contentAreaFilled is true and
-		//   - used as cell renderer (because of selection background)
+		// - if background was explicitly set to a non-UIResource color
-		//   - or if background was explicitly set to a non-UIResource color
 		if( !c.isOpaque() &&
 			((AbstractButton)c).isContentAreaFilled() &&
-			(c.getParent() instanceof CellRendererPane || !(c.getBackground() instanceof UIResource)))
+			!(c.getBackground() instanceof UIResource) )
 		{
 			g.setColor( c.getBackground() );
 			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );

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

@@ -20,11 +20,13 @@ import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
+import javax.swing.JCheckBox;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicTableUI;
+import javax.swing.table.TableCellRenderer;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -132,6 +134,12 @@ public class FlatTableUI
 			oldIntercellSpacing = table.getIntercellSpacing();
 			table.setIntercellSpacing( intercellSpacing );
 		}
+
+		// checkbox is non-opaque in FlatLaf and therefore would not paint selection
+		// --> make checkbox renderer opaque (but opaque in Metal or Windows LaF)
+		TableCellRenderer booleanRenderer = table.getDefaultRenderer( Boolean.class );
+		if( booleanRenderer instanceof JCheckBox )
+			((JCheckBox)booleanRenderer).setOpaque( true );
 	}
 
 	@Override

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatInspector.java

@@ -304,6 +304,8 @@ public class FlatInspector
 		text += "Enabled: " + c.isEnabled() + '\n';
 		text += "Opaque: " + c.isOpaque() + (c instanceof JComponent &&
 			FlatUIUtils.hasOpaqueBeenExplicitlySet( (JComponent) c ) ? " EXPLICIT" : "") + '\n';
+		if( c instanceof AbstractButton )
+			text += "ContentAreaFilled: " + ((AbstractButton)c).isContentAreaFilled() + '\n';
 		text += "Focusable: " + c.isFocusable() + '\n';
 		text += "Left-to-right: " + c.getComponentOrientation().isLeftToRight() + '\n';
 		text += "Parent: " + c.getParent().getClass().getName();