hide focus indicator when the containing window became inactive

CHANGELOG.md

@@ -1,6 +1,11 @@
 FlatLaf Change Log
 ==================
 
+## Unreleased
+
+- Hide focus indicator when window is inactive.
+
+
 ## 0.37
 
 - Custom window decorations (Windows 10 only; PR #108; issues #47 and #82)

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

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.EventQueue;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
 import javax.swing.JComponent;
@@ -106,7 +107,11 @@ public class FlatListUI
 			@Override
 			public void focusLost( FocusEvent e ) {
 				super.focusLost( e );
-				toggleSelectionColors();
+
+				// use invokeLater for the case that the window is deactivated
+				EventQueue.invokeLater( () -> {
+					toggleSelectionColors();
+				} );
 			}
 		};
 	}

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

@@ -18,6 +18,7 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
 import java.awt.Dimension;
+import java.awt.EventQueue;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
 import javax.swing.JCheckBox;
@@ -174,7 +175,11 @@ public class FlatTableUI
 			@Override
 			public void focusLost( FocusEvent e ) {
 				super.focusLost( e );
-				toggleSelectionColors();
+
+				// use invokeLater for the case that the window is deactivated
+				EventQueue.invokeLater( () -> {
+					toggleSelectionColors();
+				} );
 			}
 		};
 	}

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

@@ -38,6 +38,7 @@ import java.awt.geom.RoundRectangle2D;
 import java.util.function.Consumer;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.border.Border;
 import javax.swing.border.CompoundBorder;
@@ -139,8 +140,14 @@ public class FlatUIUtils
 		return c instanceof JComponent && Boolean.TRUE.equals( ((JComponent)c).getClientProperty( "JComboBox.isTableCellEditor" ) );
 	}
 
+	/**
+	 * Returns whether the given component is the permanent focus owner and
+	 * is in the active window. Used to paint focus indicators.
+	 */
 	public static boolean isPermanentFocusOwner( Component c ) {
-		return (KeyboardFocusManager.getCurrentKeyboardFocusManager().getPermanentFocusOwner() == c);
+		KeyboardFocusManager keyboardFocusManager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
+		return keyboardFocusManager.getPermanentFocusOwner() == c &&
+			keyboardFocusManager.getActiveWindow() == SwingUtilities.windowForComponent( c );
 	}
 
 	public static boolean isRoundRect( Component c ) {