TextField updates, and bug fixes from some recent commits.

- Added modified copy of slick.gui.TextField: added CTRL+BACKSPACE for word deletion, and disabled left/right arrows to move cursor and CTRL+Z to undo.
- Fixed musicEnded() incorrectly setting the "trackEnded" upon swapping tracks.  This has caused some nasty loops since #38.
- Fixed a null pointer exception in OsuDB from 0b03912.
- Fixed the song menu search bar transition being incorrectly reset when hitting backspace on a 0-length query.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/OsuGroupList.java

@@ -254,6 +254,7 @@ public class OsuGroupList {
 
 	/**
 	 * Returns the OsuGroupNode at an index, disregarding expansions.
+	 * @param index the node index
 	 */
 	public OsuGroupNode getBaseNode(int index) {
 		if (index < 0 || index >= size())

src/itdelatrisu/opsu/audio/MusicController.java

@@ -111,7 +111,10 @@ public class MusicController {
 			player = new Music(file.getPath(), true);
 			player.addListener(new MusicListener() {
 				@Override
-				public void musicEnded(Music music) { trackEnded = true; }
+				public void musicEnded(Music music) {
+					if (music == player)  // don't fire if music swapped
+						trackEnded = true;
+				}
 
 				@Override
 				public void musicSwapped(Music music, Music newMusic) {}

src/itdelatrisu/opsu/db/OsuDB.java

@@ -76,12 +76,6 @@ public class OsuDB {
 		// create the database
 		createDatabase();
 
-		// retrieve the cache size
-		getCacheSize();
-
-		// check the database version
-		checkVersion();
-
 		// prepare sql statements
 		try {
 			insertStmt = connection.prepareStatement(
@@ -96,6 +90,12 @@ public class OsuDB {
 		} catch (SQLException e) {
 			ErrorHandler.error("Failed to prepare beatmap statements.", e, true);
 		}
+
+		// retrieve the cache size
+		getCacheSize();
+
+		// check the database version
+		checkVersion();
 	}
 
 	/**

src/itdelatrisu/opsu/states/SongMenu.java

@@ -199,6 +199,9 @@ public class SongMenu extends BasicGameState {
 	/** Time, in milliseconds, for fading the search bar. */
 	private int searchTransitionTimer = SEARCH_TRANSITION_TIME;
 
+	/** The text length of the last string in the search TextField. */
+	private int lastSearchTextLength = -1;
+
 	// game-related variables
 	private GameContainer container;
 	private StateBasedGame game;
@@ -831,11 +834,14 @@ public class SongMenu extends BasicGameState {
 			if ((c > 31 && c < 127) || key == Input.KEY_BACK) {
 				searchTimer = 0;
 				int textLength = search.getText().length();
-				if (key == Input.KEY_BACK) {
-					if (textLength == 0)
+				if (lastSearchTextLength != textLength) {
+					if (key == Input.KEY_BACK) {
+						if (textLength == 0)
+							searchTransitionTimer = 0;
+					} else if (textLength == 1)
 						searchTransitionTimer = 0;
-				} else if (textLength == 1)
-					searchTransitionTimer = 0;
+					lastSearchTextLength = textLength;
+				}
 			}
 			break;
 		}