Add attachment creation support, display picture messages

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

@@ -2,7 +2,9 @@ package envoy.client.ui.controller;
 
 import java.awt.Toolkit;
 import java.awt.datatransfer.StringSelection;
+import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
@@ -16,6 +18,7 @@ import javafx.scene.image.ImageView;
 import javafx.scene.input.KeyCode;
 import javafx.scene.input.KeyEvent;
 import javafx.scene.paint.Color;
+import javafx.stage.FileChooser;
 
 import envoy.client.data.*;
 import envoy.client.data.audio.AudioRecorder;
@@ -60,6 +63,9 @@ public final class ChatScene implements Restorable {
 	@FXML
 	private Button voiceButton;
 
+	@FXML
+	private Button attachmentButton;
+
 	@FXML
 	private Button settingsButton;
 
@@ -234,6 +240,7 @@ public final class ChatScene implements Restorable {
 		}
 		messageTextArea.setDisable(currentChat == null || postingPermanentlyDisabled);
 		voiceButton.setDisable(!recorder.isSupported());
+		attachmentButton.setDisable(false);
 	}
 
 	/**
@@ -287,6 +294,48 @@ public final class ChatScene implements Restorable {
 		}).start();
 	}
 
+	@FXML
+	private void attachmentButtonClicked() {
+
+		// Display file chooser
+		final var fileChooser = new FileChooser();
+		fileChooser.setTitle("Add Attachment");
+		fileChooser.setInitialDirectory(new File(System.getProperty("user.home")));
+		fileChooser.getExtensionFilters()
+			.addAll(new FileChooser.ExtensionFilter("Pictures", "*.png", "*.jpg"),
+					new FileChooser.ExtensionFilter("Videos", "*.mp4"),
+					new FileChooser.ExtensionFilter("All Files", "*.*"));
+		final var file = fileChooser.showOpenDialog(sceneContext.getStage());
+
+		if(file != null) {
+
+			// Check max file size
+			if (file.length() > 16E6) {
+				new Alert(AlertType.WARNING, "The selected file exceeds the size limit of 16MB!").showAndWait();
+				return;
+			}
+
+			// Get attachment type (default is document)
+			AttachmentType type = AttachmentType.DOCUMENT;
+			switch (fileChooser.getSelectedExtensionFilter().getDescription()) {
+				case "Pictures":
+					type = AttachmentType.PICTURE;
+					break;
+				case "Videos":
+					type = AttachmentType.VIDEO;
+					break;
+			}
+
+			// Create the pending attachment
+			try {
+				pendingAttachment = new Attachment(Files.readAllBytes(file.toPath()), type);
+				attachmentView.setVisible(true);
+			} catch (IOException e) {
+				new Alert(AlertType.ERROR, "The selected file could not be loaded!").showAndWait();
+			}
+		}
+	}
+
 	/**
 	 * Checks the text length of the {@code messageTextArea}, adjusts the
 	 * {@code remainingChars} label and checks whether to send the message
@@ -373,7 +422,8 @@ public final class ChatScene implements Restorable {
 		final var text = messageTextArea.getText().strip();
 		try {
 			// Creating the message and its metadata
-			final var	builder	= new MessageBuilder(localDB.getUser().getID(), currentChat.getRecipient().getID(), localDB.getIDGenerator())
+			final var builder = new MessageBuilder(localDB.getUser().getID(), currentChat.getRecipient().getID(), localDB
+				.getIDGenerator())
 				.setText(text);
 			// Setting an attachment, if present
 			if (pendingAttachment != null) {
@@ -382,7 +432,8 @@ public final class ChatScene implements Restorable {
 				attachmentView.setVisible(false);
 			}
 			// Building the final message
-			final var	message	= currentChat.getRecipient() instanceof Group ? builder.buildGroupMessage((Group) currentChat.getRecipient())
+			final var message = currentChat.getRecipient() instanceof Group ? builder.buildGroupMessage((Group) currentChat
+				.getRecipient())
 					: builder.build();
 
 			// Send message

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

@@ -2,6 +2,7 @@ package envoy.client.ui.listcell;
 
 import java.awt.Toolkit;
 import java.awt.datatransfer.StringSelection;
+import java.io.ByteArrayInputStream;
 import java.time.format.DateTimeFormatter;
 import java.util.Map;
 import java.util.logging.Level;
@@ -67,6 +68,7 @@ public class MessageControl extends Label {
 		if (message.hasAttachment()) {
 			switch (message.getAttachment().getType()) {
 				case PICTURE:
+					vbox.getChildren().add(new ImageView(new Image(new ByteArrayInputStream(message.getAttachment().getData()))));
 					break;
 				case VIDEO:
 					break;

src/main/resources/fxml/ChatScene.fxml

@@ -100,6 +100,9 @@
 				<Insets right="10.0" />
 			</GridPane.margin>
 			<buttons>
+				<Button fx:id="attachmentButton" disable="true"
+					mnemonicParsing="false" onAction="#attachmentButtonClicked"
+					text="Add Attachment" />
 				<Button fx:id="voiceButton" disable="true"
 					onAction="#voiceButtonClicked">
 					<padding>