Initial ButtonView

- Relates #854

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

@@ -0,0 +1,122 @@
+/*
+ * 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.component.view.control;
+
+import org.springframework.shell.component.view.event.KeyEvent.Key;
+import org.springframework.shell.component.view.event.KeyHandler;
+import org.springframework.shell.component.view.event.MouseEvent;
+import org.springframework.shell.component.view.event.MouseHandler;
+import org.springframework.shell.component.view.geom.Dimension;
+import org.springframework.shell.component.view.geom.HorizontalAlign;
+import org.springframework.shell.component.view.geom.Rectangle;
+import org.springframework.shell.component.view.geom.VerticalAlign;
+import org.springframework.shell.component.view.message.ShellMessageBuilder;
+import org.springframework.shell.component.view.screen.Screen;
+import org.springframework.shell.component.view.screen.Screen.Writer;
+
+/**
+ * {@code ButtonView} is a {@link View} with border and text acting as a button.
+ *
+ * @author Janne Valkealahti
+ */
+public class ButtonView extends BoxView {
+
+	private String text;
+	private Runnable action;
+
+	public ButtonView() {
+		this(null, null);
+	}
+
+	public ButtonView(String text) {
+		this(text, null);
+	}
+
+	public ButtonView(String text, Runnable action) {
+		this.text = text;
+		this.action = action;
+	}
+
+	@Override
+	protected void initInternal() {
+		registerKeyBinding(Key.Enter, () -> keySelect());
+		registerMouseBinding(MouseEvent.Type.Released | MouseEvent.Button.Button1, event -> mouseSelect(event));
+	}
+
+	@Override
+	public KeyHandler getKeyHandler() {
+		return super.getKeyHandler();
+	}
+
+	@Override
+	public MouseHandler getMouseHandler() {
+		return super.getMouseHandler();
+	}
+
+	@Override
+	protected void drawInternal(Screen screen) {
+		Rectangle rect = getInnerRect();
+		Writer writer = screen.writerBuilder().layer(getLayer()).build();
+		if (text != null) {
+			writer.border(rect.x(), rect.y(), rect.width(), rect.height());
+			writer.text(text, rect, HorizontalAlign.CENTER, VerticalAlign.CENTER);
+		}
+
+		super.drawInternal(screen);
+	}
+
+	public Dimension getPreferredDimension() {
+		return null;
+	}
+
+	public void setText(String text) {
+		this.text = text;
+	}
+
+	public void setAction(Runnable action) {
+		this.action = action;
+	}
+
+	private void keySelect() {
+		dispatch();
+	}
+
+	private void mouseSelect(MouseEvent event) {
+		dispatch();
+	}
+
+	private void dispatch() {
+		dispatch(ShellMessageBuilder.ofView(this, ButtonViewSelectEvent.of(this)));
+		if (action != null) {
+			dispatchRunnable(action);
+		}
+	}
+
+	public record ButtonViewItemEventArgs() implements ViewEventArgs {
+
+		public static ButtonViewItemEventArgs of() {
+			return new ButtonViewItemEventArgs();
+		}
+	}
+
+	public record ButtonViewSelectEvent(View view, ButtonViewItemEventArgs args) implements ViewEvent {
+
+		public static ButtonViewSelectEvent of(View view) {
+			return new ButtonViewSelectEvent(view, ButtonViewItemEventArgs.of());
+		}
+	}
+
+}