headless backend demo

[fanfix.git] / src / jexer / backend / HeadlessBackend.java

diff --git a/src/jexer/backend/HeadlessBackend.java b/src/jexer/backend/HeadlessBackend.java
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+/*
+ * Jexer - Java Text User Interface
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (C) 2019 Kevin Lamonte
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * @author Kevin Lamonte [kevin.lamonte@gmail.com]
+ * @version 1
+ */
+package jexer.backend;
+
+import java.util.List;
+
+import jexer.event.TInputEvent;
+
+/**
+ * HeadlessBackend
+ */
+public class HeadlessBackend extends LogicalScreen implements Backend {
+
+    // ------------------------------------------------------------------------
+    // Variables --------------------------------------------------------------
+    // ------------------------------------------------------------------------
+
+    /**
+     * The session information.
+     */
+    private SessionInfo sessionInfo;
+
+    // ------------------------------------------------------------------------
+    // Constructors -----------------------------------------------------------
+    // ------------------------------------------------------------------------
+
+    /**
+     * Public constructor.
+     */
+    public HeadlessBackend() {
+        sessionInfo = new TSessionInfo(width, height);
+    }
+
+    // ------------------------------------------------------------------------
+    // Backend ----------------------------------------------------------------
+    // ------------------------------------------------------------------------
+
+    /**
+     * Getter for sessionInfo.
+     *
+     * @return the SessionInfo
+     */
+    public final SessionInfo getSessionInfo() {
+        return sessionInfo;
+    }
+
+    /**
+     * Get a Screen, which displays the text cells to the user.
+     *
+     * @return the Screen
+     */
+    public Screen getScreen() {
+        return this;
+    }
+
+    /**
+     * Subclasses must provide an implementation that syncs the logical
+     * screen to the physical device.
+     */
+    public void flushScreen() {
+        // NOP
+    }
+
+    /**
+     * Check if there are events in the queue.
+     *
+     * @return if true, getEvents() has something to return to the application
+     */
+    public boolean hasEvents() {
+        return false;
+    }
+
+    /**
+     * Subclasses must provide an implementation to get keyboard, mouse, and
+     * screen resize events.
+     *
+     * @param queue list to append new events to
+     */
+    public void getEvents(List<TInputEvent> queue) {
+        // NOP
+    }
+
+    /**
+     * Subclasses must provide an implementation that closes sockets,
+     * restores console, etc.
+     */
+    public void shutdown() {
+        // NOP
+    }
+
+    /**
+     * Set listener to a different Object.
+     *
+     * @param listener the new listening object that run() wakes up on new
+     * input
+     */
+    public void setListener(final Object listener) {
+        // NOP
+    }
+
+    /**
+     * Reload backend options from System properties.
+     */
+    public void reloadOptions() {
+        // NOP
+    }
+
+}