Issue #335: allow a different background on focus.

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

@@ -92,10 +92,12 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Component.borderColor				Color
  * @uiDefault Component.disabledBorderColor		Color
  * @uiDefault ComboBox.editableBackground		Color	optional; defaults to ComboBox.background
+ * @uiDefault ComboBox.focusedBackground		Color	optional
  * @uiDefault ComboBox.disabledBackground		Color
  * @uiDefault ComboBox.disabledForeground		Color
  * @uiDefault ComboBox.buttonBackground			Color
  * @uiDefault ComboBox.buttonEditableBackground	Color
+ * @uiDefault ComboBox.buttonFocusedBackground	Color	optional
  * @uiDefault ComboBox.buttonArrowColor			Color
  * @uiDefault ComboBox.buttonDisabledArrowColor	Color
  * @uiDefault ComboBox.buttonHoverArrowColor	Color
@@ -116,10 +118,12 @@ public class FlatComboBoxUI
 
 	protected Color editableBackground;
 	protected Color disabledBackground;
+	protected Color focusedBackground;
 	protected Color disabledForeground;
 
 	protected Color buttonBackground;
 	protected Color buttonEditableBackground;
+	protected Color buttonFocusedBackground;
 	protected Color buttonArrowColor;
 	protected Color buttonDisabledArrowColor;
 	protected Color buttonHoverArrowColor;
@@ -196,9 +200,11 @@ public class FlatComboBoxUI
 
 		editableBackground = UIManager.getColor( "ComboBox.editableBackground" );
 		disabledBackground = UIManager.getColor( "ComboBox.disabledBackground" );
+		focusedBackground = UIManager.getColor( "ComboBox.focusedBackground" );
 		disabledForeground = UIManager.getColor( "ComboBox.disabledForeground" );
 
 		buttonBackground = UIManager.getColor( "ComboBox.buttonBackground" );
+		buttonFocusedBackground = UIManager.getColor( "ComboBox.buttonFocusedBackground" );
 		buttonEditableBackground = UIManager.getColor( "ComboBox.buttonEditableBackground" );
 		buttonArrowColor = UIManager.getColor( "ComboBox.buttonArrowColor" );
 		buttonDisabledArrowColor = UIManager.getColor( "ComboBox.buttonDisabledArrowColor" );
@@ -225,10 +231,12 @@ public class FlatComboBoxUI
 
 		editableBackground = null;
 		disabledBackground = null;
+		focusedBackground = null;
 		disabledForeground = null;
 
 		buttonBackground = null;
 		buttonEditableBackground = null;
+		buttonFocusedBackground = null;
 		buttonArrowColor = null;
 		buttonDisabledArrowColor = null;
 		buttonHoverArrowColor = null;
@@ -423,7 +431,7 @@ public class FlatComboBoxUI
 
 			// paint arrow button background
 			if( enabled && !isCellRenderer ) {
-				g2.setColor( paintButton ? buttonEditableBackground : buttonBackground );
+				g2.setColor( paintButton ? buttonEditableBackground : buttonFocusedBackground != null && isFocusOwner() ? buttonFocusedBackground : buttonBackground );
 				Shape oldClip = g2.getClip();
 				if( isLeftToRight )
 					g2.clipRect( arrowX, 0, width - arrowX, height );
@@ -484,10 +492,16 @@ public class FlatComboBoxUI
 
 	protected Color getBackground( boolean enabled ) {
 		return enabled
-			? (editableBackground != null && comboBox.isEditable() ? editableBackground : comboBox.getBackground())
+			? (focusedBackground != null && isFocusOwner()
+				? focusedBackground
+				: (editableBackground != null && comboBox.isEditable() ? editableBackground : comboBox.getBackground()) )
 			: (isIntelliJTheme ? FlatUIUtils.getParentBackground( comboBox ) : disabledBackground);
 	}
 	
+	protected boolean isFocusOwner() {
+		return FlatUIUtils.isPermanentFocusOwner( comboBox ) || comboBox.getEditor() != null && comboBox.getEditor().getEditorComponent() != null && FlatUIUtils.isPermanentFocusOwner( comboBox.getEditor().getEditorComponent() );
+	}
+
 	protected Color getForeground( boolean enabled ) {
 		return enabled ? comboBox.getForeground() : disabledForeground;
 	}

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

@@ -50,6 +50,7 @@ import com.formdev.flatlaf.util.HiDPIUtils;
  * @uiDefault PasswordField.disabledBackground		Color	used if not enabled
  * @uiDefault PasswordField.inactiveBackground		Color	used if not editable
  * @uiDefault PasswordField.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault PasswordField.focusedBackground		Color	optional
  * @uiDefault PasswordField.border					Border
  * @uiDefault PasswordField.margin					Insets
  * @uiDefault PasswordField.echoChar				character
@@ -73,6 +74,7 @@ public class FlatPasswordFieldUI
 	protected int minimumWidth;
 	protected boolean isIntelliJTheme;
 	protected Color placeholderForeground;
+	protected Color focusedBackground;
 	protected boolean showCapsLock;
 	protected Icon capsLockIcon;
 
@@ -91,6 +93,7 @@ public class FlatPasswordFieldUI
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		placeholderForeground = UIManager.getColor( prefix + ".placeholderForeground" );
+		focusedBackground = UIManager.getColor( prefix + ".focusedBackground" );
 		showCapsLock = UIManager.getBoolean( "PasswordField.showCapsLock" );
 		capsLockIcon = UIManager.getIcon( "PasswordField.capsLockIcon" );
 
@@ -104,6 +107,7 @@ public class FlatPasswordFieldUI
 		super.uninstallDefaults();
 
 		placeholderForeground = null;
+		focusedBackground = null;
 		capsLockIcon = null;
 
 		MigLayoutVisualPadding.uninstall( getComponent() );
@@ -157,7 +161,7 @@ public class FlatPasswordFieldUI
 
 	@Override
 	protected void paintSafely( Graphics g ) {
-		FlatTextFieldUI.paintBackground( g, getComponent(), isIntelliJTheme );
+		FlatTextFieldUI.paintBackground( g, getComponent(), isIntelliJTheme, focusedBackground );
 		FlatTextFieldUI.paintPlaceholder( g, getComponent(), placeholderForeground );
 		paintCapsLock( g );
 

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

@@ -42,6 +42,7 @@ import com.formdev.flatlaf.util.HiDPIUtils;
  * @uiDefault TextArea.selectionBackground		Color
  * @uiDefault TextArea.selectionForeground		Color
  * @uiDefault TextArea.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault TextArea.focusedBackground		Color	optional
  * @uiDefault TextArea.border					Border
  * @uiDefault TextArea.margin					Insets
  * @uiDefault TextArea.caretBlinkRate			int		default is 500 milliseconds
@@ -63,6 +64,7 @@ public class FlatTextAreaUI
 	protected Color background;
 	protected Color disabledBackground;
 	protected Color inactiveBackground;
+	protected Color focusedBackground;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatTextAreaUI();
@@ -84,6 +86,7 @@ public class FlatTextAreaUI
 		background = UIManager.getColor( "TextArea.background" );
 		disabledBackground = UIManager.getColor( "TextArea.disabledBackground" );
 		inactiveBackground = UIManager.getColor( "TextArea.inactiveBackground" );
+		focusedBackground = UIManager.getColor( "TextArea.focusedBackground" );
 	}
 
 	@Override
@@ -93,6 +96,7 @@ public class FlatTextAreaUI
 		background = null;
 		disabledBackground = null;
 		inactiveBackground = null;
+		focusedBackground = null;
 	}
 
 	@Override
@@ -164,6 +168,12 @@ public class FlatTextAreaUI
 			return;
 		}
 
+		if( focusedBackground != null && FlatUIUtils.isPermanentFocusOwner( c ) ) {
+			g.setColor( focusedBackground );
+			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
+			return;
+		}
+
 		super.paintBackground( g );
 	}
 }

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

@@ -55,6 +55,7 @@ import com.formdev.flatlaf.util.JavaCompatibility;
  * @uiDefault TextField.disabledBackground		Color	used if not enabled
  * @uiDefault TextField.inactiveBackground		Color	used if not editable
  * @uiDefault TextField.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault TextField.focusedBackground		Color	optional
  * @uiDefault TextField.border					Border
  * @uiDefault TextField.margin					Insets
  * @uiDefault TextField.caretBlinkRate			int		default is 500 milliseconds
@@ -75,6 +76,7 @@ public class FlatTextFieldUI
 	protected int minimumWidth;
 	protected boolean isIntelliJTheme;
 	protected Color placeholderForeground;
+	protected Color focusedBackground;
 
 	private FocusListener focusListener;
 
@@ -90,6 +92,7 @@ public class FlatTextFieldUI
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		placeholderForeground = UIManager.getColor( prefix + ".placeholderForeground" );
+		focusedBackground = UIManager.getColor( prefix + ".focusedBackground" );
 
 		LookAndFeel.installProperty( getComponent(), "opaque", false );
 
@@ -101,6 +104,7 @@ public class FlatTextFieldUI
 		super.uninstallDefaults();
 
 		placeholderForeground = null;
+		focusedBackground = null;
 
 		MigLayoutVisualPadding.uninstall( getComponent() );
 	}
@@ -148,7 +152,7 @@ public class FlatTextFieldUI
 
 	@Override
 	protected void paintSafely( Graphics g ) {
-		paintBackground( g, getComponent(), isIntelliJTheme );
+		paintBackground( g, getComponent(), isIntelliJTheme, focusedBackground );
 		paintPlaceholder( g, getComponent(), placeholderForeground );
 
 		super.paintSafely( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ) );
@@ -159,7 +163,7 @@ public class FlatTextFieldUI
 		// background is painted elsewhere
 	}
 
-	static void paintBackground( Graphics g, JTextComponent c, boolean isIntelliJTheme ) {
+	static void paintBackground( Graphics g, JTextComponent c, boolean isIntelliJTheme, Color focusedBackground ) {
 		// do not paint background if:
 		//   - not opaque and
 		//   - border is not a flat border and
@@ -180,7 +184,7 @@ public class FlatTextFieldUI
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 
-			Color background = c.getBackground();
+			Color background = focusedBackground != null && FlatUIUtils.isPermanentFocusOwner( c ) ? focusedBackground : c.getBackground();
 			g2.setColor( !(background instanceof UIResource)
 				? background
 				: (isIntelliJTheme && (!c.isEnabled() || !c.isEditable())