import java.util.List;
import jexer.event.TInputEvent;
-import jexer.io.Screen;
-import jexer.session.SessionInfo;
/**
- * This abstract class provides a screen, keyboard, and mouse to
- * TApplication. It also exposes session information as gleaned from lower
- * levels of the communication stack.
+ * This interface provides a screen, keyboard, and mouse to TApplication. It
+ * also exposes session information as gleaned from lower levels of the
+ * communication stack.
*/
-public abstract class Backend {
+public interface Backend {
/**
- * The session information.
- */
- protected SessionInfo sessionInfo;
-
- /**
- * Getter for sessionInfo.
+ * Get a SessionInfo, which exposes text width/height, language,
+ * username, and other information from the communication stack.
*
* @return the SessionInfo
*/
- public final SessionInfo getSessionInfo() {
- return sessionInfo;
- }
-
- /**
- * The screen to draw on.
- */
- protected Screen screen;
+ public SessionInfo getSessionInfo();
/**
- * Getter for screen.
+ * Get a Screen, which displays the text cells to the user.
*
* @return the Screen
*/
- public final Screen getScreen() {
- return screen;
- }
+ public Screen getScreen();
/**
- * Subclasses must provide an implementation that syncs the logical
- * screen to the physical device.
+ * Classes must provide an implementation that syncs the logical screen
+ * to the physical device.
*/
- public abstract void flushScreen();
+ public void flushScreen();
/**
- * Subclasses must provide an implementation to get keyboard, mouse, and
+ * Classes must provide an implementation to get keyboard, mouse, and
* screen resize events.
*
* @param queue list to append new events to
*/
- public abstract void getEvents(List<TInputEvent> queue);
+ public void getEvents(List<TInputEvent> queue);
/**
- * Subclasses must provide an implementation that closes sockets,
- * restores console, etc.
+ * Classes must provide an implementation that closes sockets, restores
+ * console, etc.
*/
- public abstract void shutdown();
+ public void shutdown();
/**
- * Subclasses must provide an implementation that sets the window title.
+ * Classes must provide an implementation that sets the window title.
*
* @param title the new title
*/
- public abstract void setTitle(final String title);
+ public void setTitle(final String 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);
}