Add Audio Playback Capability

* Add envoy.client.data.audio package
* Move AudioRecorder to the audio package
* Add AudioPlayer class
* Add AudioControl class that acts as a small media player
* Display the audio control in message controls that contain voice
  messages

src/main/java/envoy/client/data/audio/AudioPlayer.java

@@ -0,0 +1,64 @@
+package envoy.client.data.audio;
+
+import javax.sound.sampled.*;
+
+import envoy.exception.EnvoyException;
+
+/**
+ * Plays back audio from a byte array.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>AudioPlayer.java</strong><br>
+ * Created: <strong>05.07.2020</strong><br>
+ * 
+ * @author Kai S. K. Engelbart
+ * @since Envoy Client v0.1-beta
+ */
+public final class AudioPlayer {
+
+	private final AudioFormat format;
+	private final DataLine.Info	info;
+
+	private Clip clip;
+
+	/**
+	 * Initializes the player with the default audio format.
+	 * 
+	 * @since Envoy Client v0.1-beta
+	 */
+	public AudioPlayer() { this(AudioRecorder.DEFAULT_AUDIO_FORMAT); }
+
+	/**
+	 * Initializes the player with a given audio format.
+	 * 
+	 * @param format the audio format to use
+	 * @since Envoy Client v0.1-beta
+	 */
+	public AudioPlayer(AudioFormat format) {
+		this.format	= format;
+		info		= new DataLine.Info(Clip.class, format);
+	}
+
+	/**
+	 * @return {@code true} if audio play back is supported
+	 * @since Envoy Client v0.1-beta
+	 */
+	public boolean isSupported() { return AudioSystem.isLineSupported(info); }
+
+	/**
+	 * Plays back an audio clip.
+	 * 
+	 * @param data the data of the clip
+	 * @throws EnvoyException if the play back failed
+	 * @since Envoy Client v0.1-beta
+	 */
+	public void play(byte[] data) throws EnvoyException {
+		try {
+			clip = (Clip) AudioSystem.getLine(info);
+			clip.open(format, data, 0, data.length);
+			clip.start();
+		} catch (LineUnavailableException e) {
+			throw new EnvoyException("Cannot play back audio", e);
+		}
+	}
+}

src/main/java/envoy/client/data/audio/AudioRecorder.java

@@ -1,4 +1,4 @@
-package envoy.client.data;
+package envoy.client.data.audio;
 
 import java.io.IOException;
 import java.nio.file.Files;
@@ -20,21 +20,49 @@ import envoy.exception.EnvoyException;
  */
 public final class AudioRecorder {
 
-	private final AudioFormat format;
+	/**
+	 * The default audio format used for recording and play back.
+	 * 
+	 * @since Envoy Client v0.1-beta
+	 */
+	public static final AudioFormat DEFAULT_AUDIO_FORMAT = new AudioFormat(16000, 16, 1, true, false);
+
+	private final AudioFormat	format;
+	private final DataLine.Info	info;
 
-	private DataLine.Info	info;
 	private TargetDataLine	line;
 	private Path			tempFile;
 
-	public AudioRecorder() { this(new AudioFormat(16000, 16, 1, true, false)); }
+	/**
+	 * Initializes the recorder with the default audio format.
+	 * 
+	 * @since Envoy Client v0.1-beta
+	 */
+	public AudioRecorder() { this(DEFAULT_AUDIO_FORMAT); }
 
+	/**
+	 * Initializes the recorder with a given audio format.
+	 * 
+	 * @param format the audio format to use
+	 * @since Envoy Client v0.1-beta
+	 */
 	public AudioRecorder(AudioFormat format) {
 		this.format	= format;
 		info		= new DataLine.Info(TargetDataLine.class, format);
 	}
 
+	/**
+	 * @return {@code true} if audio recording is supported
+	 * @since Envoy Client v0.1-beta
+	 */
 	public boolean isSupported() { return AudioSystem.isLineSupported(info); }
 
+	/**
+	 * Starts the audio recording.
+	 * 
+	 * @throws EnvoyException if starting the recording failed
+	 * @since Envoy Client v0.1-beta
+	 */
 	public void start() throws EnvoyException {
 		try {
 
@@ -54,6 +82,13 @@ public final class AudioRecorder {
 		}
 	}
 
+	/**
+	 * Stops the recording.
+	 * 
+	 * @return the finished recording
+	 * @throws EnvoyException if finishing the recording failed
+	 * @since Envoy Client v0.1-beta
+	 */
 	public byte[] finish() throws EnvoyException {
 		try {
 			line.stop();

src/main/java/envoy/client/data/audio/package-info.java

@@ -0,0 +1,11 @@
+/**
+ * Contains classes related to recording and playing back audio clips.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>package-info.java</strong><br>
+ * Created: <strong>05.07.2020</strong><br>
+ * 
+ * @author Kai S. K. Engelbart
+ * @since Envoy Client v0.1-beta
+ */
+package envoy.client.data.audio;

src/main/java/envoy/client/ui/AudioControl.java

@@ -0,0 +1,40 @@
+package envoy.client.ui;
+
+import javafx.scene.control.Button;
+import javafx.scene.layout.HBox;
+
+import envoy.client.data.audio.AudioPlayer;
+import envoy.exception.EnvoyException;
+
+/**
+ * Enables the play back of audio clips through a button.
+ * <p>
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>AudioControl.java</strong><br>
+ * Created: <strong>05.07.2020</strong><br>
+ * 
+ * @author Kai S. K. Engelbart
+ * @since Envoy Client v0.1-beta
+ */
+public final class AudioControl extends HBox {
+
+	private AudioPlayer player = new AudioPlayer();
+
+	/**
+	 * Initializes the audio control.
+	 * 
+	 * @param audioData the audio data to play.
+	 * @since Envoy Client v0.1-beta
+	 */
+	public AudioControl(byte[] audioData) {
+		var button = new Button("Play");
+		button.setOnAction(e -> {
+			try {
+				player.play(audioData);
+			} catch (EnvoyException ex) {
+
+			}
+		});
+		getChildren().add(button);
+	}
+}

src/main/java/envoy/client/ui/controller/ChatScene.java

@@ -18,6 +18,7 @@ import javafx.scene.input.KeyEvent;
 import javafx.scene.paint.Color;
 
 import envoy.client.data.*;
+import envoy.client.data.audio.AudioRecorder;
 import envoy.client.event.MessageCreationEvent;
 import envoy.client.net.Client;
 import envoy.client.net.WriteProxy;

src/main/java/envoy/client/ui/listcell/MessageControl.java

@@ -9,7 +9,9 @@ import javafx.scene.image.Image;
 import javafx.scene.image.ImageView;
 import javafx.scene.layout.VBox;
 
+import envoy.client.ui.AudioControl;
 import envoy.client.ui.IconUtil;
+import envoy.data.Attachment.AttachmentType;
 import envoy.data.Message;
 import envoy.data.Message.MessageStatus;
 import envoy.data.User;
@@ -38,6 +40,11 @@ public class MessageControl extends VBox {
 	public MessageControl(Message message) {
 		// Creating the underlying VBox, the dateLabel and the textLabel
 		super(new Label(dateFormat.format(message.getCreationDate())));
+
+		// Voice attachment
+		if (message.hasAttachment() && message.getAttachment().getType() == AttachmentType.VOICE)
+			getChildren().add(new AudioControl(message.getAttachment().getData()));
+
 		final var textLabel = new Label(message.getText());
 		textLabel.setWrapText(true);
 		getChildren().add(textLabel);

src/main/resources/fxml/ChatScene.fxml

@@ -13,21 +13,35 @@
 <?import javafx.scene.layout.GridPane?>
 <?import javafx.scene.layout.RowConstraints?>
 
-<GridPane hgap="5.0" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="400.0" minWidth="350.0" prefHeight="400.0" prefWidth="600.0" vgap="2.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="envoy.client.ui.controller.ChatScene">
+<GridPane hgap="5.0" maxHeight="-Infinity" maxWidth="-Infinity"
+	minHeight="400.0" minWidth="350.0" prefHeight="400.0" prefWidth="600.0"
+	vgap="2.0" xmlns="http://javafx.com/javafx/11.0.1"
+	xmlns:fx="http://javafx.com/fxml/1"
+	fx:controller="envoy.client.ui.controller.ChatScene">
 	<columnConstraints>
-		<ColumnConstraints hgrow="NEVER" minWidth="60.0" prefWidth="160.0" />
+		<ColumnConstraints hgrow="NEVER" minWidth="60.0"
-		<ColumnConstraints hgrow="ALWAYS" maxWidth="1.7976931348623157E308" minWidth="10.0" prefWidth="357.0" />
+			prefWidth="160.0" />
+		<ColumnConstraints hgrow="ALWAYS"
+			maxWidth="1.7976931348623157E308" minWidth="10.0" prefWidth="357.0" />
 	</columnConstraints>
 	<rowConstraints>
-		<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="50.0" vgrow="NEVER" />
+		<RowConstraints maxHeight="-Infinity"
-		<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="20.0" vgrow="NEVER" />
+			minHeight="-Infinity" prefHeight="50.0" vgrow="NEVER" />
-		<RowConstraints maxHeight="1.7976931348623157E308" minHeight="50.0" prefHeight="155.14286150251115" vgrow="ALWAYS" />
+		<RowConstraints maxHeight="-Infinity"
-		<RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="20.0" vgrow="NEVER" />
+			minHeight="-Infinity" prefHeight="20.0" vgrow="NEVER" />
-		<RowConstraints maxHeight="120.0" minHeight="40.0" prefHeight="60.0" vgrow="NEVER" />
+		<RowConstraints maxHeight="1.7976931348623157E308"
-      <RowConstraints maxHeight="-Infinity" minHeight="-Infinity" prefHeight="40.0" vgrow="NEVER" />
+			minHeight="50.0" prefHeight="155.14286150251115" vgrow="ALWAYS" />
+		<RowConstraints maxHeight="-Infinity"
+			minHeight="-Infinity" prefHeight="20.0" vgrow="NEVER" />
+		<RowConstraints maxHeight="120.0" minHeight="40.0"
+			prefHeight="60.0" vgrow="NEVER" />
+		<RowConstraints maxHeight="-Infinity"
+			minHeight="-Infinity" prefHeight="40.0" vgrow="NEVER" />
 	</rowConstraints>
 	<children>
-		<ListView fx:id="userList" onMouseClicked="#userListClicked" prefHeight="211.0" prefWidth="300.0" GridPane.rowIndex="1" GridPane.rowSpan="2147483647">
+		<ListView fx:id="userList" onMouseClicked="#userListClicked"
+			prefHeight="211.0" prefWidth="300.0" GridPane.rowIndex="1"
+			GridPane.rowSpan="2147483647">
 			<GridPane.margin>
 				<Insets bottom="10.0" left="10.0" />
 			</GridPane.margin>
@@ -37,12 +51,14 @@
 			<contextMenu>
 				<ContextMenu anchorLocation="CONTENT_TOP_LEFT">
 					<items>
-						<MenuItem fx:id="deleteContactMenuItem" mnemonicParsing="false" onAction="#deleteContact" text="Delete" />
+						<MenuItem fx:id="deleteContactMenuItem"
+							mnemonicParsing="false" onAction="#deleteContact" text="Delete" />
 					</items>
 				</ContextMenu>
 			</contextMenu>
 		</ListView>
-		<Label fx:id="contactLabel" prefHeight="27.0" prefWidth="134.0" GridPane.columnSpan="2">
+		<Label fx:id="contactLabel" prefHeight="27.0" prefWidth="134.0"
+			GridPane.columnSpan="2">
 			<GridPane.margin>
 				<Insets left="10.0" />
 			</GridPane.margin>
@@ -50,7 +66,10 @@
 				<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
 			</padding>
 		</Label>
-		<Button fx:id="settingsButton" mnemonicParsing="true" onAction="#settingsButtonClicked" text="_Settings" GridPane.columnIndex="1" GridPane.halignment="RIGHT" GridPane.valignment="CENTER">
+		<Button fx:id="settingsButton" mnemonicParsing="true"
+			onAction="#settingsButtonClicked" text="_Settings"
+			GridPane.columnIndex="1" GridPane.halignment="RIGHT"
+			GridPane.valignment="CENTER">
 			<GridPane.margin>
 				<Insets bottom="10.0" right="10.0" top="10.0" />
 			</GridPane.margin>
@@ -58,7 +77,10 @@
 				<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
 			</padding>
 		</Button>
-		<ListView fx:id="messageList" prefHeight="257.0" prefWidth="465.0" GridPane.columnIndex="1" GridPane.columnSpan="2147483647" GridPane.rowIndex="1" GridPane.rowSpan="2">
+		<ListView fx:id="messageList" prefHeight="257.0"
+			prefWidth="465.0" GridPane.columnIndex="1"
+			GridPane.columnSpan="2147483647" GridPane.rowIndex="1"
+			GridPane.rowSpan="2">
 			<GridPane.margin>
 				<Insets left="5.0" right="10.0" />
 			</GridPane.margin>
@@ -68,29 +90,43 @@
 			<contextMenu>
 				<ContextMenu anchorLocation="CONTENT_TOP_LEFT">
 					<items>
-						<MenuItem mnemonicParsing="false" onAction="#copyMessage" text="Copy" />
+						<MenuItem mnemonicParsing="false" onAction="#copyMessage"
-						<MenuItem mnemonicParsing="false" onAction="#deleteMessage" text="Delete" />
+							text="Copy" />
-						<MenuItem mnemonicParsing="false" onAction="#forwardMessage" text="Forward" />
+						<MenuItem mnemonicParsing="false"
-						<MenuItem mnemonicParsing="false" onAction="#quoteMessage" text="Quote" />
+							onAction="#deleteMessage" text="Delete" />
-						<MenuItem mnemonicParsing="false" onAction="#loadMessageInfoScene" text="Info" />
+						<MenuItem mnemonicParsing="false"
+							onAction="#forwardMessage" text="Forward" />
+						<MenuItem mnemonicParsing="false"
+							onAction="#quoteMessage" text="Quote" />
+						<MenuItem mnemonicParsing="false"
+							onAction="#loadMessageInfoScene" text="Info" />
 					</items>
 				</ContextMenu>
 			</contextMenu>
 		</ListView>
-      <ButtonBar prefWidth="436.0" GridPane.columnIndex="1" GridPane.halignment="CENTER" GridPane.rowIndex="5" GridPane.valignment="BOTTOM">
+		<ButtonBar prefWidth="436.0" GridPane.columnIndex="1"
+			GridPane.halignment="CENTER" GridPane.rowIndex="5"
+			GridPane.valignment="BOTTOM">
 			<GridPane.margin>
 				<Insets right="10.0" top="5.0" />
 			</GridPane.margin>
 			<buttons>
-            <Button fx:id="voiceButton" onAction="#voiceButtonClicked" text="_Record Voice Message" />
+				<Button fx:id="voiceButton" onAction="#voiceButtonClicked"
-      		<Button fx:id="postButton" defaultButton="true" disable="true" mnemonicParsing="true" onAction="#postMessage" prefHeight="10.0" prefWidth="75.0" text="_Post">
+					text="_Record Voice Message" />
+				<Button fx:id="postButton" defaultButton="true"
+					disable="true" mnemonicParsing="true" onAction="#postMessage"
+					prefHeight="10.0" prefWidth="75.0" text="_Post">
 					<tooltip>
-      				<Tooltip anchorLocation="WINDOW_TOP_LEFT" autoHide="true" maxWidth="350.0" text="Click this button to send the message. If it is disabled, you first have to select a contact to send it to. A message may automatically be sent when you press (Ctrl + ) Enter, according to your preferences. Additionally sends a message when pressing &quot;Alt&quot; + &quot;P&quot;." wrapText="true" />
+						<Tooltip anchorLocation="WINDOW_TOP_LEFT" autoHide="true"
+							maxWidth="350.0"
+							text="Click this button to send the message. If it is disabled, you first have to select a contact to send it to. A message may automatically be sent when you press (Ctrl + ) Enter, according to your preferences. Additionally sends a message when pressing &quot;Alt&quot; + &quot;P&quot;."
+							wrapText="true" />
 					</tooltip>
 					<contextMenu>
 						<ContextMenu anchorLocation="CONTENT_TOP_LEFT">
 							<items>
-      						<MenuItem mnemonicParsing="false" onAction="#copyAndPostMessage" text="Copy and Send" />
+								<MenuItem mnemonicParsing="false"
+									onAction="#copyAndPostMessage" text="Copy and Send" />
 							</items>
 						</ContextMenu>
 					</contextMenu>
@@ -100,7 +136,11 @@
 				</Button>
 			</buttons>
 		</ButtonBar>
-		<TextArea fx:id="messageTextArea" disable="true" onInputMethodTextChanged="#messageTextUpdated" onKeyPressed="#checkPostConditions" onKeyTyped="#checkKeyCombination" prefHeight="200.0" prefWidth="200.0" wrapText="true" GridPane.columnIndex="1" GridPane.rowIndex="4">
+		<TextArea fx:id="messageTextArea" disable="true"
+			onInputMethodTextChanged="#messageTextUpdated"
+			onKeyPressed="#checkPostConditions" onKeyTyped="#checkKeyCombination"
+			prefHeight="200.0" prefWidth="200.0" wrapText="true"
+			GridPane.columnIndex="1" GridPane.rowIndex="4">
 			<GridPane.margin>
 				<Insets bottom="10.0" left="5.0" right="10.0" top="3.0" />
 			</GridPane.margin>
@@ -108,7 +148,10 @@
 				<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
 			</opaqueInsets>
 		</TextArea>
-		<Button mnemonicParsing="true" onAction="#addContactButtonClicked" text="_Add Contacts" GridPane.halignment="CENTER" GridPane.rowIndex="5" GridPane.valignment="CENTER">
+		<Button mnemonicParsing="true"
+			onAction="#addContactButtonClicked" text="_Add Contacts"
+			GridPane.halignment="CENTER" GridPane.rowIndex="5"
+			GridPane.valignment="CENTER">
 			<padding>
 				<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
 			</padding>
@@ -116,7 +159,11 @@
 				<Insets bottom="10.0" left="10.0" right="5.0" top="5.0" />
 			</GridPane.margin>
 		</Button>
-		<Label id="remainingCharsLabel" fx:id="remainingChars" ellipsisString="" maxHeight="30.0" maxWidth="180.0" prefHeight="30.0" prefWidth="180.0" text="remaining chars: 0/x" textFill="LIME" textOverrun="LEADING_WORD_ELLIPSIS" visible="false" GridPane.columnIndex="1" GridPane.rowIndex="3">
+		<Label id="remainingCharsLabel" fx:id="remainingChars"
+			ellipsisString="" maxHeight="30.0" maxWidth="180.0" prefHeight="30.0"
+			prefWidth="180.0" text="remaining chars: 0/x" textFill="LIME"
+			textOverrun="LEADING_WORD_ELLIPSIS" visible="false"
+			GridPane.columnIndex="1" GridPane.rowIndex="3">
 			<GridPane.margin>
 				<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
 			</GridPane.margin>
@@ -127,10 +174,14 @@
 				<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
 			</opaqueInsets>
 			<tooltip>
-				<Tooltip text="Shows how many chars you can still enter in this message" wrapText="true" />
+				<Tooltip
+					text="Shows how many chars you can still enter in this message"
+					wrapText="true" />
 			</tooltip>
 		</Label>
-		<Label fx:id="infoLabel" text="Something happened" textFill="#faa007" visible="false" wrapText="true" GridPane.columnIndex="1" GridPane.rowIndex="1">
+		<Label fx:id="infoLabel" text="Something happened"
+			textFill="#faa007" visible="false" wrapText="true"
+			GridPane.columnIndex="1" GridPane.rowIndex="1">
 			<GridPane.margin>
 				<Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
 			</GridPane.margin>