Add ProgressView initial scenario

- Relates #995

spring-shell-samples/spring-shell-sample-catalog/src/main/java/org/springframework/shell/samples/catalog/scenario/progress/SimpleProgressViewScenario.java

@@ -0,0 +1,126 @@
+/*
+ * Copyright 2024 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.progress;
+
+import java.time.Duration;
+import java.util.List;
+import java.util.ListIterator;
+
+import reactor.core.publisher.Flux;
+
+import org.springframework.messaging.Message;
+import org.springframework.messaging.support.MessageBuilder;
+import org.springframework.shell.component.message.ShellMessageHeaderAccessor;
+import org.springframework.shell.component.message.StaticShellMessageHeaderAccessor;
+import org.springframework.shell.component.view.control.GridView;
+import org.springframework.shell.component.view.control.ProgressView;
+import org.springframework.shell.component.view.control.ProgressView.ProgressViewItem;
+import org.springframework.shell.component.view.control.View;
+import org.springframework.shell.component.view.event.EventLoop;
+import org.springframework.shell.geom.HorizontalAlign;
+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 = "Simple progressview", description = "ProgressView sample", category = {
+		Scenario.CATEGORY_PROGRESSVIEW })
+public class SimpleProgressViewScenario extends AbstractScenario {
+
+	@Override
+	public ScenarioContext buildContext() {
+		ContextData contextData = buildContextData();
+		return ScenarioContext.of(contextData.view(), contextData.start(), contextData.stop());
+	}
+
+	private record ContextData(View view, List<ProgressView> progress, Runnable start, Runnable stop) {
+	}
+
+	private ContextData buildContextData() {
+		List<ProgressView> views = List.of(plain(), spinnerOnly(), percentOnly(), spreadAlign());
+		GridView grid = new GridView();
+		grid.setShowBorders(true);
+		configure(grid);
+		int[] rows = new int[views.size()];
+		for (int i = 0; i < rows.length; i++) {
+			rows[i] = 1;
+		}
+		grid.setRowSize(rows);
+		grid.setColumnSize(0);
+
+		ListIterator<ProgressView> iter = views.listIterator();
+		while (iter.hasNext()) {
+			ProgressView view = iter.next();
+			configure(view);
+			view.start();
+			grid.addItem(view, iter.previousIndex(), 0, 1, 1, 0, 0);
+		}
+
+		EventLoop eventLoop = getEventloop();
+
+		Flux<Message<?>> ticks = Flux.interval(Duration.ofMillis(500)).take(100).map(l -> {
+			Message<Long> message = MessageBuilder
+				.withPayload(l)
+				.setHeader(ShellMessageHeaderAccessor.EVENT_TYPE, EventLoop.Type.USER)
+				.setHeader("SimpleProgressViewScenario", "")
+				.build();
+			return message;
+		});
+
+		eventLoop.dispatch(ticks);
+
+		eventLoop.onDestroy(eventLoop.events()
+			.filter(m -> EventLoop.Type.USER.equals(StaticShellMessageHeaderAccessor.getEventType(m))
+					&& m.getHeaders().containsKey("SimpleProgressViewScenario"))
+			.subscribe(m -> {
+				views.forEach(v -> {
+					v.tickAdvance(1);
+				});
+			}));
+
+		Runnable stop = () -> {
+			views.forEach(v -> {
+				v.stop();
+			});
+		};
+
+		return new ContextData(grid, views, null, stop);
+	}
+
+	private ProgressView plain() {
+		ProgressView view = new ProgressView();
+		view.setDescription("desc");
+		return view;
+	}
+
+	private ProgressView spinnerOnly() {
+		ProgressView view = new ProgressView(ProgressViewItem.ofSpinner());
+		return view;
+	}
+
+	private ProgressView percentOnly() {
+		ProgressView view = new ProgressView(ProgressViewItem.ofPercent());
+		return view;
+	}
+
+	private ProgressView spreadAlign() {
+		ProgressView view = new ProgressView(ProgressViewItem.ofText(0, HorizontalAlign.LEFT),
+				ProgressViewItem.ofSpinner(0, HorizontalAlign.CENTER),
+				ProgressViewItem.ofPercent(0, HorizontalAlign.RIGHT));
+		view.setDescription("desc");
+		return view;
+	}
+
+}