Overhaul ListView to support checked states

- ListView can be defined to use nocheck, checked or radio
- List can now scroll through up/down
- Actual visual is handled in a DefaultListCell
- Modify/add scenarios and catalog app
- Relates #865

spring-shell-samples/spring-shell-sample-catalog/src/main/java/org/springframework/shell/samples/catalog/Catalog.java

@@ -44,7 +44,7 @@ import org.springframework.shell.component.view.control.MenuView.MenuItemCheckSt
 import org.springframework.shell.component.view.control.StatusBarView;
 import org.springframework.shell.component.view.control.StatusBarView.StatusItem;
 import org.springframework.shell.component.view.control.View;
-import org.springframework.shell.component.view.control.cell.ListCell;
+import org.springframework.shell.component.view.control.cell.AbstractListCell;
 import org.springframework.shell.component.view.event.EventLoop;
 import org.springframework.shell.component.view.event.KeyEvent;
 import org.springframework.shell.component.view.event.KeyEvent.Key;
@@ -148,7 +148,7 @@ public class Catalog {
 		// start main scenario browser
 		ui.setRoot(app, true);
 		ui.setFocus(categories);
-		categories.setSelected(0);
+		// categories.setSelected(0);
 		ui.run();
 	}
 
@@ -238,7 +238,11 @@ public class Catalog {
 		return categories;
 	}
 
-	private static class ScenarioListCell extends ListCell<ScenarioData> {
+	private static class ScenarioListCell extends AbstractListCell<ScenarioData> {
+
+		public ScenarioListCell(ScenarioData item) {
+			super(item);
+		}
 
 		@Override
 		public void draw(Screen screen) {
@@ -257,7 +261,7 @@ public class Catalog {
 		scenarios.setTitle("Scenarios");
 		scenarios.setFocusedTitleStyle(ScreenItem.STYLE_BOLD);
 		scenarios.setShowBorder(true);
-		scenarios.setCellFactory(list -> new ScenarioListCell());
+		scenarios.setCellFactory((list, item) -> new ScenarioListCell(item));
 		return scenarios;
 	}
 

spring-shell-samples/spring-shell-sample-catalog/src/main/java/org/springframework/shell/samples/catalog/scenario/listview/CheckedListViewScenario.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.shell.samples.catalog.scenario.listview;
+
+import java.util.Arrays;
+
+import org.springframework.shell.component.view.control.ListView;
+import org.springframework.shell.component.view.control.View;
+import org.springframework.shell.component.view.control.ListView.ItemStyle;
+import org.springframework.shell.samples.catalog.scenario.AbstractScenario;
+import org.springframework.shell.samples.catalog.scenario.Scenario;
+import org.springframework.shell.samples.catalog.scenario.ScenarioComponent;
+
+@ScenarioComponent(name = "Radio List", description = "Items with radio states", category = { Scenario.CATEGORY_LISTVIEW })
+public class CheckedListViewScenario extends AbstractScenario {
+
+	@Override
+	public View build() {
+		ListView<String> view = new ListView<>(ItemStyle.RADIO);
+		view.setEventLoop(getEventloop());
+		view.setItems(Arrays.asList("item1", "item2", "item3"));
+		return view;
+	}
+
+}

spring-shell-samples/spring-shell-sample-catalog/src/main/java/org/springframework/shell/samples/catalog/scenario/listview/LongListViewScenario.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.shell.samples.catalog.scenario.listview;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+import org.springframework.shell.component.view.control.ListView;
+import org.springframework.shell.component.view.control.View;
+import org.springframework.shell.samples.catalog.scenario.AbstractScenario;
+import org.springframework.shell.samples.catalog.scenario.Scenario;
+import org.springframework.shell.samples.catalog.scenario.ScenarioComponent;
+
+@ScenarioComponent(name = "Long List", description = "Show many items", category = { Scenario.CATEGORY_LISTVIEW })
+public class LongListViewScenario extends AbstractScenario {
+
+	@Override
+	public View build() {
+		ListView<String> view = new ListView<>();
+		view.setEventLoop(getEventloop());
+		List<String> items = IntStream.of(20).mapToObj(i -> "item" + i).collect(Collectors.toList());
+		view.setItems(items);
+		return view;
+	}
+
+}

spring-shell-samples/spring-shell-sample-catalog/src/main/java/org/springframework/shell/samples/catalog/scenario/listview/RadioListViewScenario.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.shell.samples.catalog.scenario.listview;
+
+import java.util.Arrays;
+
+import org.springframework.shell.component.view.control.ListView;
+import org.springframework.shell.component.view.control.View;
+import org.springframework.shell.component.view.control.ListView.ItemStyle;
+import org.springframework.shell.samples.catalog.scenario.AbstractScenario;
+import org.springframework.shell.samples.catalog.scenario.Scenario;
+import org.springframework.shell.samples.catalog.scenario.ScenarioComponent;
+
+@ScenarioComponent(name = "Checked List", description = "Items with checked states", category = { Scenario.CATEGORY_LISTVIEW })
+public class RadioListViewScenario extends AbstractScenario {
+
+	@Override
+	public View build() {
+		ListView<String> view = new ListView<>(ItemStyle.CHECKED);
+		view.setEventLoop(getEventloop());
+		view.setItems(Arrays.asList("item1", "item2", "item3"));
+		return view;
+	}
+
+}