From ca97bfc5547057c3fbb1abd566f4d247143ad0f6 Mon Sep 17 00:00:00 2001
From: Victor <annimon119@gmail.com>
Date: Wed, 6 Sep 2017 14:58:15 +0300
Subject: [PATCH] Add undo/redo functionality

---
 .../hotarufx/ui/controller/EditorController.java | 16 ++++++++++++++++
 app/src/main/resources/fxml/Editor.fxml          |  4 ++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/com/annimon/hotarufx/ui/controller/EditorController.java b/app/src/main/java/com/annimon/hotarufx/ui/controller/EditorController.java
index 6b7afd2..f3fbec8 100644
--- a/app/src/main/java/com/annimon/hotarufx/ui/controller/EditorController.java
+++ b/app/src/main/java/com/annimon/hotarufx/ui/controller/EditorController.java
@@ -20,9 +20,11 @@ import java.util.Arrays;
 import java.util.ResourceBundle;
 import java.util.concurrent.Executors;
 import javafx.application.Platform;
+import javafx.beans.binding.Bindings;
 import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
+import javafx.scene.control.Button;
 import javafx.scene.control.TextArea;
 import javafx.scene.control.TitledPane;
 import javafx.stage.Stage;
@@ -32,6 +34,9 @@ import org.fxmisc.richtext.LineNumberFactory;
 
 public class EditorController implements Initializable, DocumentListener {
 
+    @FXML
+    private Button undoButton, redoButton;
+
     @FXML
     private CodeArea editor;
 
@@ -120,7 +125,18 @@ public class EditorController implements Initializable, DocumentListener {
         syntaxHighlighter = new SyntaxHighlighter(editor, Executors.newSingleThreadExecutor());
         syntaxHighlighter.init();
         documentManager = new FileManager();
+        initUndoRedo();
         openSample();
+        editor.getUndoManager().forgetHistory();
+    }
+
+    private void initUndoRedo() {
+        undoButton.disableProperty().bind(
+                Bindings.not(editor.undoAvailableProperty()));
+        redoButton.disableProperty().bind(
+                Bindings.not(editor.redoAvailableProperty()));
+        undoButton.setOnAction(a -> editor.undo());
+        redoButton.setOnAction(a -> editor.redo());
     }
 
     public void setPrimaryStage(Stage primaryStage) {
diff --git a/app/src/main/resources/fxml/Editor.fxml b/app/src/main/resources/fxml/Editor.fxml
index eed701a..a621fce 100644
--- a/app/src/main/resources/fxml/Editor.fxml
+++ b/app/src/main/resources/fxml/Editor.fxml
@@ -31,12 +31,12 @@
                 </Menu>
             </MenuBar>
             <ToolBar>
-                <Button>
+                <Button fx:id="undoButton">
                     <graphic>
                         <FontAwesomeIcon icon="undo"/>
                     </graphic>
                 </Button>
-                <Button>
+                <Button fx:id="redoButton">
                     <graphic>
                         <FontAwesomeIcon icon="redo"/>
                     </graphic>