jdk/test/jdk/java/awt/List/ListSelection/DeselectionUnitTest.java

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

import java.awt.Frame;
import java.awt.List;

/**
 * @test
 * @bug 8369327
 * @summary Test awt list deselection methods
 * @key headful
 */
public final class DeselectionUnitTest {

    public static void main(String[] args) {
        testNonDisplayable(DeselectionUnitTest::testSingleMode);
        testNonDisplayable(DeselectionUnitTest::testMultipleMode);
        testNonDisplayable(DeselectionUnitTest::testInvalidDeselection);
        testNonDisplayable(DeselectionUnitTest::testEmptyListDeselection);

        testDisplayable(DeselectionUnitTest::testSingleMode);
        testDisplayable(DeselectionUnitTest::testMultipleMode);
        testDisplayable(DeselectionUnitTest::testInvalidDeselection);
        testDisplayable(DeselectionUnitTest::testEmptyListDeselection);
    }

    interface Test {
        void execute(Frame frame);
    }

    private static void testNonDisplayable(Test test) {
        test.execute(null);
    }

    private static void testDisplayable(Test test) {
        Frame frame = new Frame();
        try {
            frame.setSize(300, 200);
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
            test.execute(frame);
        } finally {
            frame.dispose();
        }
    }

    private static List createList(Frame frame, boolean multi) {
        List list = new List(4, multi);
        if (frame != null) {
            frame.add(list);
        }
        list.add("Item1");
        list.add("Item2");
        list.add("Item3");
        return list;
    }

    private static void testSingleMode(Frame frame) {
        List list = createList(frame, false);

        // Select and deselect single item
        list.select(1);
        assertTrue(list.isIndexSelected(1));
        list.deselect(1);
        assertEquals(-1, list.getSelectedIndex());
        assertEquals(0, list.getSelectedIndexes().length);
        assertFalse(list.isIndexSelected(0));
        assertFalse(list.isIndexSelected(1));
        assertFalse(list.isIndexSelected(2));

        // Deselect non-selected item (should be no-op)
        list.select(0);
        list.deselect(2);
        assertEquals(0, list.getSelectedIndex());
        assertTrue(list.isIndexSelected(0));
        assertFalse(list.isIndexSelected(1));
        assertFalse(list.isIndexSelected(2));
    }

    private static void testMultipleMode(Frame frame) {
        List list = createList(frame, true);

        // Select multiple items and deselect one
        list.select(0);
        list.select(1);
        list.select(2);
        assertEquals(3, list.getSelectedIndexes().length);

        list.deselect(1);
        assertEquals(2, list.getSelectedIndexes().length);
        assertTrue(list.isIndexSelected(0));
        assertFalse(list.isIndexSelected(1));
        assertTrue(list.isIndexSelected(2));

        // Deselect all remaining
        list.deselect(0);
        list.deselect(2);
        assertEquals(-1, list.getSelectedIndex());
        assertEquals(0, list.getSelectedIndexes().length);
        assertFalse(list.isIndexSelected(0));
        assertFalse(list.isIndexSelected(1));
        assertFalse(list.isIndexSelected(2));
    }

    private static void testInvalidDeselection(Frame frame) {
        List list = createList(frame, false);

        // Deselect invalid indices (should be no-op)
        list.select(0);
        list.deselect(-1);
        list.deselect(5);
        assertEquals(0, list.getSelectedIndex());
        assertTrue(list.isIndexSelected(0));
        assertFalse(list.isIndexSelected(1));
        assertFalse(list.isIndexSelected(2));
    }

    private static void testEmptyListDeselection(Frame frame) {
        List list = new List();
        if (frame != null) {
            frame.add(list);
        }

        // Deselect on empty list (should be no-op)
        list.deselect(0);
        list.deselect(-1);
        assertEquals(-1, list.getSelectedIndex());
        assertEquals(0, list.getSelectedIndexes().length);
        assertFalse(list.isIndexSelected(0));
    }

    private static void assertEquals(int expected, int actual) {
        if (expected != actual) {
            throw new RuntimeException(
                    "Expected %d, got %d".formatted(expected, actual));
        }
    }

    private static void assertTrue(boolean condition) {
        if (!condition) {
            throw new RuntimeException("Expected true but got false");
        }
    }

    private static void assertFalse(boolean condition) {
        if (condition) {
            throw new RuntimeException("Expected false but got true");
        }
    }
}