Implement type to seek for map table in download UI.

game-app/game-core/src/main/java/games/strategy/engine/framework/map/download/DownloadMapsWindow.java

@@ -233,11 +233,12 @@ private JTabbedPane newAvailableInstalledTabbedPanel(
         mapList.getOutOfDateExcluding(pendingDownloads);
     // For the UX, always show an available maps tab, even if it is empty
     final JPanel available =
-        newMapSelectionPanel(mapList.getAvailableExcluding(pendingDownloads), MapAction.INSTALL);
+        newMapSelectionPanel(
+            mapList.getAvailableExcluding(pendingDownloads), MapAction.INSTALL, true);
     tabbedPane.addTab("New Maps", available);
 
     if (!outOfDateDownloads.isEmpty()) {
-      final JPanel outOfDate = newMapSelectionPanel(outOfDateDownloads, MapAction.UPDATE);
+      final JPanel outOfDate = newMapSelectionPanel(outOfDateDownloads, MapAction.UPDATE, false);
       tabbedPane.addTab("Updates Available", outOfDate);
     }
 
@@ -247,14 +248,17 @@ private JTabbedPane newAvailableInstalledTabbedPanel(
               mapList.getInstalled().keySet().stream()
                   .sorted(Comparator.comparing(m -> m.getMapName().toUpperCase()))
                   .collect(Collectors.toList()),
-              MapAction.REMOVE);
+              MapAction.REMOVE,
+              false);
       tabbedPane.addTab("Installed", installed);
     }
     return tabbedPane;
   }
 
   private JPanel newMapSelectionPanel(
-      final List<MapDownloadItem> unsortedMaps, final MapAction action) {
+      final List<MapDownloadItem> unsortedMaps,
+      final MapAction action,
+      final boolean requestFocus) {
     final JPanel main = new JPanelBuilder().border(30).borderLayout().build();
     final JEditorPane descriptionPane = SwingComponents.newHtmlJEditorPane();
     main.add(SwingComponents.newJScrollPane(descriptionPane), BorderLayout.CENTER);
@@ -264,6 +268,9 @@ private JPanel newMapSelectionPanel(
     if (!unsortedMaps.isEmpty()) {
       final MapDownloadSwingTable mapDownloadSwingTable = new MapDownloadSwingTable(unsortedMaps);
       final JTable gamesList = mapDownloadSwingTable.getSwingComponent();
+      if (requestFocus) {
+        SwingUtilities.invokeLater(() -> gamesList.requestFocus());
+      }
       mapDownloadSwingTable.addMapSelectionListener(
           mapSelections ->
               newDescriptionPanelUpdatingSelectionListener(

game-app/game-core/src/main/java/games/strategy/engine/framework/map/download/MapDownloadSwingTable.java

@@ -12,6 +12,7 @@
 import org.triplea.http.client.maps.listing.MapDownloadItem;
 import org.triplea.http.client.maps.listing.MapTag;
 import org.triplea.swing.JTableBuilder;
+import org.triplea.swing.JTableTypeAheadListener;
 
 /**
  * UI component representing a list of maps to download. The table is sortable and displays
@@ -50,6 +51,7 @@ public MapDownloadSwingTable(final Collection<MapDownloadItem> maps) {
                     .collect(Collectors.toList()))
             .rowMapper(mapDownloadListing -> rowMapper(mapDownloadListing, tagNames))
             .build();
+    table.addKeyListener(new JTableTypeAheadListener(table, 0));
   }
 
   /**

lib/swing-lib/src/main/java/org/triplea/swing/JTableTypeAheadListener.java

@@ -0,0 +1,51 @@
+package org.triplea.swing;
+
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+import javax.swing.JTable;
+import lombok.RequiredArgsConstructor;
+
+/** A KeyListener that implements row selection in a JTable by prefix-matching typed text. */
+@RequiredArgsConstructor
+public class JTableTypeAheadListener extends KeyAdapter {
+  private static int INPUT_RESET_TIME_MS = 500; // 0.5s
+
+  private final JTable table;
+  // Column that contains text data that should be matched.
+  private final int columnIndex;
+
+  private String inputString = "";
+  private long keyPressTime;
+
+  @Override
+  public void keyPressed(KeyEvent evt) {
+    char ch = evt.getKeyChar();
+    if (!Character.isLetterOrDigit(ch)) {
+      return;
+    }
+
+    long time = System.currentTimeMillis();
+    if (time > keyPressTime + INPUT_RESET_TIME_MS) {
+      inputString = "";
+    }
+    keyPressTime = keyPressTime;
+    inputString += Character.toLowerCase(ch);
+
+    final var tableModel = table.getModel();
+    final int rowCount = tableModel.getRowCount();
+    final int selectedRow = table.getSelectedRow();
+    for (int i = 0; i < rowCount; i++) {
+      int row = (selectedRow + i) % rowCount;
+      String str = "" + tableModel.getValueAt(row, columnIndex);
+      if (str.toLowerCase().startsWith(inputString)) {
+        selectRow(row);
+        break;
+      }
+    }
+  }
+
+  private void selectRow(int rowIndex) {
+    table.setRowSelectionInterval(rowIndex, rowIndex);
+    table.scrollRectToVisible(table.getCellRect(rowIndex, 0, true));
+  }
+}