MultiBackend and MultiScreen

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

diff --git a/src/jexer/backend/MultiBackend.java b/src/jexer/backend/MultiBackend.java
new file mode 100644 (file)
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+++ b/src/jexer/backend/MultiBackend.java
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+/*
+ * Jexer - Java Text User Interface
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (C) 2017 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.LinkedList;
+import java.util.List;
+
+import jexer.event.TInputEvent;
+
+/**
+ * MultiBackend mirrors its I/O to several backends.
+ */
+public class MultiBackend implements Backend {
+
+    /**
+     * The screen to use.
+     */
+    private MultiScreen multiScreen;
+
+    /**
+     * The list of backends to use.
+     */
+    private List<Backend> backends = new LinkedList<Backend>();
+
+    /**
+     * Public constructor requires one backend.  Note that this backend's
+     * screen will be replaced with a MultiScreen.
+     *
+     * @param backend the backend to add
+     */
+    public MultiBackend(final Backend backend) {
+        backends.add(backend);
+        multiScreen = new MultiScreen(backend.getScreen());
+    }
+
+    /**
+     * Add a backend to the list.
+     *
+     * @param backend the backend to add
+     */
+    public void addBackend(final Backend backend) {
+        backends.add(backend);
+        multiScreen.addScreen(backend.getScreen());
+    }
+
+    /**
+     * Remove a backend from the list.
+     *
+     * @param backend the backend to remove
+     */
+    public void removeBackend(final Backend backend) {
+        if (backends.size() > 1) {
+            multiScreen.removeScreen(backend.getScreen());
+            backends.remove(backend);
+        }
+    }
+
+    /**
+     * Getter for sessionInfo.
+     *
+     * @return the SessionInfo
+     */
+    public final SessionInfo getSessionInfo() {
+        return backends.get(0).getSessionInfo();
+    }
+
+    /**
+     * Getter for screen.
+     *
+     * @return the Screen
+     */
+    public final Screen getScreen() {
+        return multiScreen;
+    }
+
+    /**
+     * Subclasses must provide an implementation that syncs the logical
+     * screen to the physical device.
+     */
+    public void flushScreen() {
+        for (Backend backend: backends) {
+            backend.flushScreen();
+        }
+    }
+
+    /**
+     * 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) {
+        for (Backend backend: backends) {
+            backend.getEvents(queue);
+        }
+    }
+
+    /**
+     * Subclasses must provide an implementation that closes sockets,
+     * restores console, etc.
+     */
+    public void shutdown() {
+        for (Backend backend: backends) {
+            backend.shutdown();
+        }
+    }
+
+    /**
+     * Subclasses must provide an implementation that sets the window title.
+     *
+     * @param title the new title
+     */
+    public void setTitle(final String title) {
+        for (Backend backend: backends) {
+            backend.setTitle(title);
+        }
+    }
+
+    /**
+     * 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) {
+        for (Backend backend: backends) {
+            backend.setListener(listener);
+        }
+    }
+
+}