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 void paint( Graphics g, JComponent c ) {
  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 static Path2D createPath( boolean close, double... points ) {
  }
 
  /**
+ * 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,