ToolTip: use anti-aliasing to render multi-line tooltips

CHANGELOG.md

@@ -9,6 +9,7 @@ FlatLaf Change Log
   and is no longer interrupted by the scroll buttons.
 - TabbedPane: Content pane is no longer opaque. Use antialiasing for painting
   separator and content border.
+- ToolTip: Use anti-aliasing to render multi-line tooltips.
 - JIDE Common Layer: Support `JideTabbedPane`.
 
 

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

@@ -81,7 +81,7 @@ public class FlatToolTipUI
 			boolean leftToRight = (comp != null ? comp : c).getComponentOrientation().isLeftToRight();
 			for( String line : lines ) {
 				y += lineHeight;
-				g.drawString( line, leftToRight ? x : x2 - SwingUtilities.computeStringWidth( fm, line ), y );
+				FlatUIUtils.drawString( c, g, line, leftToRight ? x : x2 - SwingUtilities.computeStringWidth( fm, line ), y );
 			}
 		} else
 			super.paint( g, c );

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

@@ -256,6 +256,22 @@ public class FlatUIUtils
 	}
 
 	/**
+	 * Draws the given string at the specified location using text properties
+	 * and anti-aliasing hints from the provided component.
+	 *
+	 * Use this method instead of Graphics.drawString() for correct anti-aliasing.
+	 *
+	 * Replacement for SwingUtilities2.drawString()
+	 */
+	public static void drawString( JComponent c, Graphics g, String text, int x, int y ) {
+		JavaCompatibility.drawStringUnderlineCharAt( c, g, text, -1, x, y );
+	}
+
+	/**
+	 * Draws the given string at the specified location underlining the specified
+	 * character. The provided component is used to query text properties and
+	 * anti-aliasing hints.
+	 *
 	 * Replacement for SwingUtilities2.drawStringUnderlineCharAt()
 	 */
 	public static void drawStringUnderlineCharAt( JComponent c, Graphics g,