Make StatusBarView work with hotkeys

- StatusItem can now define a hotkey which is then
  bound to its action.
- In catalog app replace use of raw key event to
  item's hotkey for status bar visibility.
- Various doc updates.
- Relates #826

spring-shell-core/src/main/java/org/springframework/shell/component/view/control/AppView.java

@@ -135,7 +135,10 @@ public class AppView extends BoxView {
 
 	@Override
 	public KeyHandler getHotKeyHandler() {
-		return menu != null ? menu.getHotKeyHandler() : super.getHotKeyHandler();
+		KeyHandler mainHandler = main != null ? main.getHotKeyHandler() : super.getHotKeyHandler();
+		KeyHandler menuHandler = menu != null ? menu.getHotKeyHandler() : super.getHotKeyHandler();
+		KeyHandler statusHandler = status != null ? status.getHotKeyHandler() : super.getHotKeyHandler();
+		return mainHandler.thenIfNotConsumed(menuHandler).thenIfNotConsumed(statusHandler);
 	}
 
 	@Override

spring-shell-core/src/main/java/org/springframework/shell/component/view/control/StatusBarView.java

@@ -121,6 +121,7 @@ public class StatusBarView extends BoxView {
 	public void setItems(List<StatusItem> items) {
 		this.items.clear();
 		this.items.addAll(items);
+		registerHotKeys();
 	}
 
 	/**
@@ -132,6 +133,17 @@ public class StatusBarView extends BoxView {
 		return items;
 	}
 
+	private void registerHotKeys() {
+		getItems().stream()
+			.filter(item -> item.getHotKey() != null)
+			.forEach(item -> {
+				Runnable action = item.getAction();
+				if (action != null) {
+					registerHotKeyBinding(item.getHotKey(), action);
+				}
+			});
+	}
+
 	/**
 	 * {@link StatusItem} represents an item in a {@link StatusBarView}.
 	 */
@@ -139,14 +151,32 @@ public class StatusBarView extends BoxView {
 
 		private String title;
 		private Runnable action;
+		private Integer hotKey;
 
 		public StatusItem(String title) {
 			this(title, null);
 		}
 
 		public StatusItem(String title, Runnable action) {
+			this(title, action, null);
+		}
+
+		public StatusItem(String title, Runnable action, Integer hotKey) {
 			this.title = title;
 			this.action = action;
+			this.hotKey = hotKey;
+		}
+
+		public static StatusItem of(String title) {
+			return new StatusItem(title);
+		}
+
+		public static StatusItem of(String title, Runnable action) {
+			return new StatusItem(title, action);
+		}
+
+		public static StatusItem of(String title, Runnable action, Integer hotKey) {
+			return new StatusItem(title, action, hotKey);
 		}
 
 		public String getTitle() {
@@ -157,8 +187,18 @@ public class StatusBarView extends BoxView {
 			return action;
 		}
 
-		public void setAction(Runnable action) {
+		public StatusItem setAction(Runnable action) {
 			this.action = action;
+			return this;
+		}
+
+		public Integer getHotKey() {
+			return hotKey;
+		}
+
+		public StatusItem setHotKey(Integer hotKey) {
+			this.hotKey = hotKey;
+			return this;
 		}
 
 	}

spring-shell-core/src/test/java/org/springframework/shell/component/view/control/StatusBarViewTests.java

@@ -26,6 +26,7 @@ import reactor.test.StepVerifier;
 
 import org.springframework.shell.component.view.control.StatusBarView.StatusBarViewOpenSelectedItemEvent;
 import org.springframework.shell.component.view.control.StatusBarView.StatusItem;
+import org.springframework.shell.component.view.event.KeyEvent.Key;
 import org.springframework.shell.component.view.event.MouseEvent;
 import org.springframework.shell.component.view.event.MouseHandler.MouseHandlerResult;
 import org.springframework.test.util.ReflectionTestUtils;
@@ -51,8 +52,23 @@ class StatusBarViewTests extends AbstractViewTests {
 
 			view = new StatusBarView(Arrays.asList(new StatusItem("item1")));
 			assertThat(view.getItems()).hasSize(1);
+
+			view = new StatusBarView(Arrays.asList(StatusItem.of("item1")));
+			assertThat(view.getItems()).hasSize(1);
 		}
 
+		@Test
+		void hotkeys() {
+			StatusItem item;
+
+			item = StatusItem.of("title");
+			assertThat(item.getHotKey()).isNull();
+			item.setHotKey(Key.f);
+			assertThat(item.getHotKey()).isEqualTo(Key.f);
+
+			item = StatusItem.of("title").setHotKey(Key.f);
+			assertThat(item.getHotKey()).isEqualTo(Key.f);
+		}
 	}
 
 	@Nested

spring-shell-docs/modules/ROOT/nav.adoc

@@ -56,6 +56,7 @@
 ** xref:tui/intro/index.adoc[]
 *** xref:tui/intro/terminalui.adoc[]
 ** xref:tui/views/index.adoc[]
+*** xref:tui/views/app.adoc[]
 *** xref:tui/views/box.adoc[]
 *** xref:tui/views/button.adoc[]
 *** xref:tui/views/dialog.adoc[]
@@ -63,6 +64,7 @@
 *** xref:tui/views/list.adoc[]
 *** xref:tui/views/menu.adoc[]
 *** xref:tui/views/menubar.adoc[]
+*** xref:tui/views/statusbar.adoc[]
 ** xref:tui/events/index.adoc[]
 *** xref:tui/events/eventloop.adoc[]
 *** xref:tui/events/key.adoc[]

spring-shell-docs/modules/ROOT/pages/tui/views/app.adoc

@@ -0,0 +1,41 @@
+= AppView
+:page-section-summary-toc: 1
+
+ifndef::snippets[:snippets: ../../../../../src/test/java/org/springframework/shell/docs]
+
+_AppView_ is a base implementation providing functionality to draw opinionated _application view_.
+Inherits xref:tui/views/box.adoc[].
+
+Generic idea is to have menu and status views which typically are xref:tui/views/menubar.adoc[] and
+xref:tui/views/statusbar.adoc[] respectively. Main content view is then whatever user want to show
+in it.
+
+[source, text]
+----
+┌──────────────────────────┐
+│           Menu           │
+├──────────────────────────┤
+│                          │
+│           Main           │
+│                          │
+├──────────────────────────┤
+│          Status          │
+└──────────────────────────┘
+----
+
+== Key Handling
+If menu has a focus key handling is processed there, then main is consulted for handling.
+Lastly cursor left/right are processed to dispatch _AppViewEvent_.
+
+== HotKey Handling
+Hotkeys are processed in order of _main_, _menu_ and _status_.
+
+== Events
+.AppView Events
+|===
+|Event |Description
+
+|AppViewEvent
+|Direction for a next selection.
+
+|===

spring-shell-docs/modules/ROOT/pages/tui/views/menubar.adoc

@@ -7,6 +7,13 @@ ifndef::snippets[:snippets: ../../../../../src/test/java/org/springframework/she
 _MenuBarView_ is a base implementation providing functionality to draw a menu bar.
 Inherits xref:tui/views/box.adoc[].
 
+[source, text]
+----
+┌─────────────────────────────┐
+│ File Help                   │
+└─────────────────────────────┘
+----
+
 == Default Bindings
 Default _key bindigs_ are:
 

spring-shell-docs/modules/ROOT/pages/tui/views/statusbar.adoc

@@ -0,0 +1,48 @@
+= StatusBarView
+:page-section-summary-toc: 1
+
+ifndef::snippets[:snippets: ../../../../../src/test/java/org/springframework/shell/docs]
+
+_StatusBarView_ is a base implementation providing functionality to draw a status bar.
+Inherits xref:tui/views/box.adoc[].
+
+[source, text]
+----
+┌─────────────────────────────┐
+│ Item1 | Item2 | Item3       │
+└─────────────────────────────┘
+----
+
+You can create a simple status bar with an item:
+
+[source, java, indent=0]
+----
+include::{snippets}/StatusBarViewSnippets.java[tag=simple]
+----
+
+Constructor can take array form which allows to lay out simple
+item definitions in a _dsl_ style.
+
+[source, java, indent=0]
+----
+include::{snippets}/StatusBarViewSnippets.java[tag=viaarray]
+----
+
+Items support runnable actions which generally as executed when
+item is selected. It can also get attached to a hot key.
+
+[source, java, indent=0]
+----
+include::{snippets}/StatusBarViewSnippets.java[tag=items]
+----
+
+
+== Events
+.StatusBarView Events
+|===
+|Event |Description
+
+|StatusBarViewOpenSelectedItemEvent
+|StatusItem is selected.
+
+|===

spring-shell-docs/src/test/java/org/springframework/shell/docs/StatusBarViewSnippets.java

@@ -0,0 +1,63 @@
+/*
+ * 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.docs;
+
+import java.util.List;
+
+import org.springframework.shell.component.view.control.StatusBarView;
+import org.springframework.shell.component.view.control.StatusBarView.StatusItem;
+import org.springframework.shell.component.view.event.KeyEvent;
+import org.springframework.shell.component.view.event.KeyEvent.Key;
+
+class StatusBarViewSnippets {
+
+	@SuppressWarnings("unused")
+	void simple() {
+		// tag::simple[]
+		StatusItem item1 = new StatusBarView.StatusItem("Item1");
+		StatusBarView statusBar = new StatusBarView(List.of(item1));
+		// end::simple[]
+	}
+
+	void items() {
+		// tag::items[]
+		StatusItem item1 = StatusBarView.StatusItem.of("Item1");
+
+		Runnable action1 = () -> {};
+		StatusItem item2 = StatusBarView.StatusItem.of("Item2", action1);
+
+		Runnable action2 = () -> {};
+		StatusItem item3 = StatusBarView.StatusItem.of("Item3", action2, KeyEvent.Key.f10);
+
+		StatusBarView statusBar = new StatusBarView();
+		statusBar.setItems(List.of(item1, item2, item3));
+		// end::items[]
+	}
+
+	void viaArray() {
+		// tag::viaarray[]
+		new StatusBarView(new StatusItem[] {
+			StatusItem.of("Item1"),
+			StatusItem.of("Item2")
+				.setAction(() -> {}),
+			StatusItem.of("Item3")
+				.setAction(() -> {})
+				.setHotKey(Key.f10)
+		});
+		// end::viaarray[]
+	}
+
+}

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

@@ -16,7 +16,6 @@
 package org.springframework.shell.samples.catalog;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
@@ -203,21 +202,6 @@ public class Catalog {
 				}
 			));
 
-		// we could potentially do keybinding somewhere else
-		// but at least this shows how to do it in low level.
-		// essentially we now just handle F10 to toggle
-		// menubar visibility
-		// TODO: when we get support for hotkeys we should do
-		//       binding there
-		eventLoop.onDestroy(eventLoop.keyEvents()
-			.subscribe(event -> {
-					log.debug("Raw keyevent {}", event);
-					if (event.isKey(KeyEvent.Key.f10)) {
-						app.toggleStatusBarVisibility();
-					}
-				}
-			));
-
 		return app;
 	}
 
@@ -322,11 +306,12 @@ public class Catalog {
 
 	private StatusBarView buildStatusBar(EventLoop eventLoop) {
 		Runnable quitAction = () -> requestQuit();
-		StatusBarView statusBar = new StatusBarView();
+		Runnable visibilyAction = () -> app.toggleStatusBarVisibility();
+		StatusBarView statusBar = new StatusBarView(new StatusItem[] {
+			StatusItem.of("CTRL-Q Quit", quitAction),
+			StatusItem.of("F10 Status Bar", visibilyAction, KeyEvent.Key.f10)
+		});
 		ui.configure(statusBar);
-		StatusItem item1 = new StatusBarView.StatusItem("CTRL-Q Quit", quitAction);
-		StatusItem item2 = new StatusBarView.StatusItem("F10 Status Bar");
-		statusBar.setItems(Arrays.asList(item1, item2));
 		return statusBar;
 	}