Merge PR #484: Fix NPE when painting icon on OS X top menu bar

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatHelpButtonIcon.java

@@ -96,8 +96,8 @@ public class FlatHelpButtonIcon
 			</svg>
 		*/
 
-		boolean enabled = c.isEnabled();
-		boolean focused = FlatUIUtils.isPermanentFocusOwner( c );
+		boolean enabled = c == null || c.isEnabled();
+		boolean focused = c != null && FlatUIUtils.isPermanentFocusOwner( c );
 
 		float xy = 0.5f;
 		float wh = iconSize() - 1;

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatMenuArrowIcon.java

@@ -63,7 +63,7 @@ public class FlatMenuArrowIcon
 
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
-		if( !c.getComponentOrientation().isLeftToRight() )
+		if( c != null && !c.getComponentOrientation().isLeftToRight() )
 			g.rotate( Math.toRadians( 180 ), width / 2., height / 2. );
 
 		g.setColor( getArrowColor( c ) );
@@ -82,7 +82,7 @@ public class FlatMenuArrowIcon
 		if( c instanceof JMenu && ((JMenu)c).isSelected() && !isUnderlineSelection() )
 			return selectionForeground;
 
-		return c.isEnabled() ? arrowColor : disabledArrowColor;
+		return c == null || c.isEnabled() ? arrowColor : disabledArrowColor;
 	}
 
 	protected boolean isUnderlineSelection() {

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

@@ -573,6 +573,9 @@ public class FlatButtonUI
 	public static Color buttonStateColor( Component c, Color enabledColor, Color disabledColor,
 		Color focusedColor, Color hoverColor, Color pressedColor )
 	{
+		if( c == null )
+			return enabledColor;
+
 		if( !c.isEnabled() )
 			return disabledColor;
 

flatlaf-core/src/test/java/com/formdev/flatlaf/icons/TestFlatIconPaintingNullComponent.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2022 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.icons;
+
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.image.BufferedImage;
+import javax.swing.Icon;
+import com.formdev.flatlaf.ui.TestUtils;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+class TestFlatIconPaintingNullComponent
+{
+	static Graphics graphics;
+
+	@BeforeAll
+	static void setup() {
+		TestUtils.setup( false );
+		graphics = new BufferedImage( 32, 32, BufferedImage.TYPE_INT_ARGB ).getGraphics();
+		graphics.setColor( Color.white );
+	}
+
+	@AfterAll
+	static void cleanup() {
+		TestUtils.cleanup();
+		graphics = null;
+	}
+
+	@Test
+	void flatHelpButtonIcon() {
+		paintWithoutException( new FlatHelpButtonIcon() );
+	}
+
+	@Test
+	void flatMenuArrowIcon() {
+		paintWithoutException( new FlatMenuArrowIcon() );
+	}
+
+	@Test
+	void flatSearchIcon() {
+		paintWithoutException( new FlatSearchIcon() );
+	}
+
+	private void paintWithoutException( Icon icon ) {
+		graphics.clearRect( 0, 0, 32, 32 );
+		assertDoesNotThrow( () -> icon.paintIcon( null, graphics, 0, 0 ) );
+	}
+}