8202702: Clearing selection on JTable causes disappearance of a row

Reviewed-by: serb

src/java.desktop/share/classes/javax/swing/plaf/basic/BasicTableUI.java

@@ -1872,7 +1872,12 @@ public class BasicTableUI extends TableUI
             // and if there is any selected rows
             if (rMax != (table.getRowCount() - 1) &&
                     (table.getSelectedRow() == -1)) {
-                rMax = rMax - 1;
+                // Do not decrement rMax if rMax becomes
+                // less than or equal to rMin
+                // else cells will not be painted
+                if (rMax - rMin > 1) {
+                    rMax = rMax - 1;
+                }
             }
         }
 

test/jdk/javax/swing/JTable/TestClearSel.java

@@ -0,0 +1,194 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * 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.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+/*
+ * @test
+ * @key headful
+ * @bug 8202702
+ * @summary  Verifies if Jtable clear selction causes disappearance of a row.
+ * @run main/manual TestClearSel
+ */
+import java.awt.BorderLayout;
+import java.awt.Component;
+import java.awt.FlowLayout;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import javax.swing.JButton;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.JTable;
+import javax.swing.JTextArea;
+import javax.swing.SwingUtilities;
+import javax.swing.table.DefaultTableModel;
+import javax.swing.table.TableModel;
+
+public class TestClearSel {
+
+    static DefaultTableModel model;
+
+    public static void main(String[] args) throws Exception {
+        final CountDownLatch latch = new CountDownLatch(1);
+
+        ClearSelTest test = new ClearSelTest(latch);
+        Thread T1 = new Thread(test);
+        T1.start();
+
+        // wait for latch to complete
+        boolean ret = false;
+        try {
+            ret = latch.await(60, TimeUnit.SECONDS);
+        } catch (InterruptedException ie) {
+            throw ie;
+        }
+        if (!ret) {
+            test.dispose();
+            throw new RuntimeException(" User has not executed the test");
+        }
+
+        if (test.testResult == false) {
+            throw new RuntimeException("Some text were not rendered properly"
+                    + " during painting of Jtable rows ");
+        }
+    }
+}
+
+class ClearSelTest implements Runnable {
+    static JFrame f;
+    static JDialog dialog;
+    static DefaultTableModel model;
+    public boolean testResult = false;
+    private final CountDownLatch latch;
+    private static String[] rows = new String[]{
+            "Row1", "Row2", "Row3", "Row4", "Row5",
+            "Row6", "Row7", "Row8", "Row9", "Row10"};
+
+    public ClearSelTest(CountDownLatch latch) throws Exception {
+        this.latch = latch;
+    }
+
+    @Override
+    public void run() {
+        try {
+            SwingUtilities.invokeAndWait(() -> {
+                createUI();
+                clearSelTest();
+            });
+        } catch (Exception ex) {
+            if (f != null) {
+                f.dispose();
+            }
+            latch.countDown();
+            throw new RuntimeException("createUI Failed: " + ex.getMessage());
+        }
+
+    }
+
+    public void dispose() {
+        dialog.dispose();
+        f.dispose();
+    }
+
+    private static void clearSelTest() {
+        final DefaultTableModel model = new DefaultTableModel();
+        model.addColumn("Test", rows);
+        final JTable table = new JTable(model);
+        table.setRowHeight(25);
+
+        final MouseAdapter adapt = new MouseAdapter() {
+
+            @Override
+            public void mouseMoved(final MouseEvent pE) {
+                final int row = table.rowAtPoint(pE.getPoint());
+                if (row > -1) {
+                    table.setRowSelectionInterval(row, row);
+                } else {
+                    table.clearSelection();
+                }
+            }
+
+            @Override
+            public void mouseEntered(final MouseEvent pE) {
+                final int row = table.rowAtPoint(pE.getPoint());
+                if (row > -1) {
+                    table.setRowSelectionInterval(row, row);
+                } else {
+                    table.clearSelection();
+                }
+            }
+
+            @Override
+            public void mouseExited(final MouseEvent pE) {
+                table.clearSelection();
+            }
+        };
+        table.addMouseListener(adapt);
+        table.addMouseMotionListener(adapt);
+
+        f = new JFrame();
+        f.setSize(300, 300);
+        f.setLocationRelativeTo(null);
+        f.add(table);
+        f.setVisible(true);
+    }
+
+
+    private final void createUI() {
+        String description
+                = " INSTRUCTIONS:\n"
+                + " A JTable will be shown.\n"
+                + " Move mouse over different row to select the row.\n "
+                + " Please verify if row text disappear "
+                + " if mouse is moved out of table.\n"
+                + " If any moment any part of the rows will not be\n "
+                + " painted properly and if some text are missing in JTable,\n "
+                + " then press fail else press pass";
+
+        dialog = new JDialog();
+        dialog.setTitle("textselectionTest");
+        JTextArea textArea = new JTextArea(description);
+        textArea.setEditable(false);
+        final JButton passButton = new JButton("PASS");
+        passButton.addActionListener((e) -> {
+            testResult = true;
+            dispose();
+            latch.countDown();
+        });
+        final JButton failButton = new JButton("FAIL");
+        failButton.addActionListener((e) -> {
+            testResult = false;
+            dispose();
+            latch.countDown();
+        });
+        JPanel mainPanel = new JPanel(new BorderLayout());
+        mainPanel.add(textArea, BorderLayout.CENTER);
+        JPanel buttonPanel = new JPanel(new FlowLayout());
+        buttonPanel.add(passButton);
+        buttonPanel.add(failButton);
+        mainPanel.add(buttonPanel, BorderLayout.SOUTH);
+        dialog.add(mainPanel);
+        dialog.pack();
+        dialog.setVisible(true);
+    }
+}