add message history

Author: ArtifactForms

voxels-client/src/main/java/client/usecases/chat/ChatComponent.java

@@ -60,6 +60,17 @@ public void onKeyPressed(KeyEvent e) {
       case ESCAPE:
         controller.closeChat();
         return;
+
+      case ARROW_UP:
+        controller.moveHistoryUp();
+        return;
+
+      case ARROW_DOWN:
+        controller.moveHistoryDown();
+        return;
+
+      default:
+        return;
     }
   }
 

voxels-client/src/main/java/client/usecases/chat/ChatController.java

@@ -1,89 +1,131 @@
 package client.usecases.chat;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class ChatController {
 
   private static final int MAX_MESSAGE_LENGTH = 256;
+  private static final int MAX_HISTORY_SIZE = 50;
 
   private final StringBuilder buffer = new StringBuilder();
-
   private int cursor = 0;
   private boolean open = false;
 
+  private final List<String> history = new ArrayList<>();
+  private int historyIndex = -1;
+  private String currentDraft = "";
+
   private final SendChatMessageController sendController;
 
   public ChatController(SendChatMessageController sendController) {
     this.sendController = sendController;
   }
 
+  public void moveHistoryUp() {
+    if (history.isEmpty()) return;
+
+    if (historyIndex == -1) {
+      currentDraft = buffer.toString();
+    }
+
+    if (historyIndex < history.size() - 1) {
+      historyIndex++;
+      loadHistoryEntry(history.get(history.size() - 1 - historyIndex));
+    }
+  }
+
+  public void moveHistoryDown() {
+    if (historyIndex == -1) return;
+
+    historyIndex--;
+
+    if (historyIndex == -1) {
+      loadHistoryEntry(currentDraft);
+    } else {
+      loadHistoryEntry(history.get(history.size() - 1 - historyIndex));
+    }
+  }
+
+  private void loadHistoryEntry(String text) {
+    buffer.setLength(0);
+    buffer.append(text);
+    cursor = buffer.length();
+  }
+
   public void openChat() {
     open = true;
+    historyIndex = -1;
+    currentDraft = "";
     sendController.onOpenChat();
   }
 
   public void closeChat() {
     open = false;
     buffer.setLength(0);
     cursor = 0;
+    historyIndex = -1;
     sendController.onCloseChat();
   }
 
-  public boolean isOpen() {
-    return open;
-  }
+  public void send() {
+    String msg = buffer.toString().trim();
 
-  public String getText() {
-    return buffer.toString();
-  }
+    if (!msg.isEmpty()) {
+      sendController.onSendMessage(msg);
 
-  public int getCursor() {
-    return cursor;
-  }
+      if (history.isEmpty() || !history.get(history.size() - 1).equals(msg)) {
+        history.add(msg);
+        if (history.size() > MAX_HISTORY_SIZE) {
+          history.remove(0);
+        }
+      }
+    }
 
-  // =========================
-  // Editing
-  // =========================
+    closeChat();
+  }
 
   public void insert(char c) {
-
     if (buffer.length() >= MAX_MESSAGE_LENGTH) return;
 
+    if (historyIndex != -1) {
+      historyIndex = -1;
+    }
+
     buffer.insert(cursor, c);
     cursor++;
   }
 
   public void backspace() {
-
     if (cursor == 0) return;
-
     buffer.deleteCharAt(cursor - 1);
     cursor--;
+    if (historyIndex != -1) historyIndex = -1;
   }
 
   public void delete() {
-
     if (cursor >= buffer.length()) return;
-
     buffer.deleteCharAt(cursor);
+    if (historyIndex != -1) historyIndex = -1;
   }
 
   public void moveLeft() {
-
     if (cursor > 0) cursor--;
   }
 
   public void moveRight() {
-
     if (cursor < buffer.length()) cursor++;
   }
 
-  public void send() {
-
-    String msg = buffer.toString().trim();
+  public boolean isOpen() {
+    return open;
+  }
 
-    if (!msg.isEmpty()) {
-      sendController.onSendMessage(msg);
-    }
+  public String getText() {
+    return buffer.toString();
+  }
 
-    closeChat();
+  public int getCursor() {
+    return cursor;
   }
 }