List:

- fixed wrong x/width bounds of alternating rows for multi-column lists (PR #939)
- Demo: added "alternating rows" checkboxes to "Data Components" page

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponents2Test.java

@@ -494,6 +494,11 @@ public class FlatComponents2Test
 			list.setVisibleRowCount( visibleRowCount );
 	}
 
+	private void listAlternatingRowsChanged() {
+		UIManager.put( "List.alternateRowColor", listAlternatingRowsCheckBox.isSelected() ? Color.YELLOW : null );
+		FlatLaf.updateUILater();
+	}
+
 	private void treeRendererChanged() {
 		Object sel = treeRendererComboBox.getSelectedItem();
 		if( !(sel instanceof String) )
@@ -530,6 +535,11 @@ public class FlatComponents2Test
 			tree.putClientProperty( FlatClientProperties.TREE_WIDE_CELL_RENDERER, wideCellRenderer );
 	}
 
+	private void treeAlternatingRowsChanged() {
+		UIManager.put( "Tree.alternateRowColor", treeAlternatingRowsCheckBox.isSelected() ? Color.cyan : null );
+		FlatLaf.updateUILater();
+	}
+
 	private void treePaintSelectionChanged() {
 		boolean paintSelection = treePaintSelectionCheckBox.isSelected();
 		for( JTree tree : allTrees )
@@ -670,12 +680,14 @@ public class FlatComponents2Test
 		listLayoutOrientationField = new JComboBox<>();
 		JLabel listVisibleRowCountLabel = new JLabel();
 		listVisibleRowCountSpinner = new JSpinner();
+		listAlternatingRowsCheckBox = new JCheckBox();
 		treeOptionsPanel = new JPanel();
 		JLabel treeRendererLabel = new JLabel();
 		treeRendererComboBox = new JComboBox<>();
 		treeWideSelectionCheckBox = new JCheckBox();
 		treeWideCellRendererCheckBox = new JCheckBox();
 		treePaintSelectionCheckBox = new JCheckBox();
+		treeAlternatingRowsCheckBox = new JCheckBox();
 		treePaintLinesCheckBox = new JCheckBox();
 		treeRedLinesCheckBox = new JCheckBox();
 		treeEditableCheckBox = new JCheckBox();
@@ -737,7 +749,7 @@ public class FlatComponents2Test
 				// rows
 				"[]" +
 				"[grow]" +
-				"[]" +
+				"[]0" +
 				"[]"));
 
 			//---- listLabel ----
@@ -780,7 +792,7 @@ public class FlatComponents2Test
 				// rows
 				"[]" +
 				"[grow]" +
-				"[]" +
+				"[]0" +
 				"[]"));
 
 			//---- tableLabel ----
@@ -817,7 +829,7 @@ public class FlatComponents2Test
 				// rows
 				"[]" +
 				"[grow]" +
-				"[]" +
+				"[]0" +
 				"[]"));
 
 			//---- treeLabel ----
@@ -1006,6 +1018,7 @@ public class FlatComponents2Test
 				// rows
 				"[]" +
 				"[]" +
+				"[]" +
 				"[]"));
 
 			//---- listRendererLabel ----
@@ -1043,6 +1056,11 @@ public class FlatComponents2Test
 			listVisibleRowCountSpinner.setModel(new SpinnerNumberModel(8, 0, null, 1));
 			listVisibleRowCountSpinner.addChangeListener(e -> listVisibleRowCountChanged());
 			listOptionsPanel.add(listVisibleRowCountSpinner, "cell 1 2");
+
+			//---- listAlternatingRowsCheckBox ----
+			listAlternatingRowsCheckBox.setText("alternating rows");
+			listAlternatingRowsCheckBox.addActionListener(e -> listAlternatingRowsChanged());
+			listOptionsPanel.add(listAlternatingRowsCheckBox, "cell 0 3 2 1,alignx left,growx 0");
 		}
 		add(listOptionsPanel, "cell 0 4 4 1");
 
@@ -1096,6 +1114,11 @@ public class FlatComponents2Test
 			treePaintSelectionCheckBox.addActionListener(e -> treePaintSelectionChanged());
 			treeOptionsPanel.add(treePaintSelectionCheckBox, "cell 0 2");
 
+			//---- treeAlternatingRowsCheckBox ----
+			treeAlternatingRowsCheckBox.setText("alternating rows");
+			treeAlternatingRowsCheckBox.addActionListener(e -> treeAlternatingRowsChanged());
+			treeOptionsPanel.add(treeAlternatingRowsCheckBox, "cell 0 2");
+
 			//---- treePaintLinesCheckBox ----
 			treePaintLinesCheckBox.setText("paint lines");
 			treePaintLinesCheckBox.addActionListener(e -> treePaintLinesChanged());
@@ -1253,11 +1276,13 @@ public class FlatComponents2Test
 	private JComboBox<String> listRendererComboBox;
 	private JComboBox<String> listLayoutOrientationField;
 	private JSpinner listVisibleRowCountSpinner;
+	private JCheckBox listAlternatingRowsCheckBox;
 	private JPanel treeOptionsPanel;
 	private JComboBox<String> treeRendererComboBox;
 	private JCheckBox treeWideSelectionCheckBox;
 	private JCheckBox treeWideCellRendererCheckBox;
 	private JCheckBox treePaintSelectionCheckBox;
+	private JCheckBox treeAlternatingRowsCheckBox;
 	private JCheckBox treePaintLinesCheckBox;
 	private JCheckBox treeRedLinesCheckBox;
 	private JCheckBox treeEditableCheckBox;
@@ -1363,7 +1388,7 @@ public class FlatComponents2Test
 		@Override
 		public String getElementAt( int index ) {
 			return (index < 20)
-				? "item " + (index + 1)
+				? "item " + (index + 1) + ((index + 1) % 5 == 0 ? " ####" : "")
 				: "item " + (index + 1) + "   " + randomRowString( index );
 		}
 	}

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponents2Test.jfd

@@ -33,7 +33,7 @@ new FormModel {
 			} )
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$columnConstraints": "[fill]"
-				"$rowConstraints": "[][grow][][]"
+				"$rowConstraints": "[][grow][]0[]"
 				"$layoutConstraints": "ltr,insets 0,hidemode 3"
 			} ) {
 				name: "panel1"
@@ -95,7 +95,7 @@ new FormModel {
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "insets 0,hidemode 3"
 				"$columnConstraints": "[fill]"
-				"$rowConstraints": "[][grow][][]"
+				"$rowConstraints": "[][grow][]0[]"
 			} ) {
 				name: "panel3"
 				"$client.FlatLaf.internal.testing.ignore": true
@@ -146,7 +146,7 @@ new FormModel {
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "insets 0,hidemode 3"
 				"$columnConstraints": "[fill]"
-				"$rowConstraints": "[][grow][][]"
+				"$rowConstraints": "[][grow][]0[]"
 			} ) {
 				name: "panel2"
 				"$client.FlatLaf.internal.testing.ignore": true
@@ -385,7 +385,7 @@ new FormModel {
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "insets 8,hidemode 3"
 				"$columnConstraints": "[fill][fill]"
-				"$rowConstraints": "[][][]"
+				"$rowConstraints": "[][][][]"
 			} ) {
 				name: "listOptionsPanel"
 				"border": new javax.swing.border.TitledBorder( "JList Control" )
@@ -455,6 +455,16 @@ new FormModel {
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 1 2"
 				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "listAlternatingRowsCheckBox"
+					"text": "alternating rows"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "listAlternatingRowsChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 3 2 1,alignx left,growx 0"
+				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 0 4 4 1"
 			} )
@@ -527,6 +537,16 @@ new FormModel {
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 2"
 				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "treeAlternatingRowsCheckBox"
+					"text": "alternating rows"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "treeAlternatingRowsChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 2"
+				} )
 				add( new FormComponent( "javax.swing.JCheckBox" ) {
 					name: "treePaintLinesCheckBox"
 					"text": "paint lines"