From b3355266572deef1a5c3e494ad162c592383e455 Mon Sep 17 00:00:00 2001
From: isXander <xandersmith2008@gmail.com>
Date: Mon, 14 Aug 2023 23:27:45 +0100
Subject: More-or-less complete API for YACL auto-gen

---
 .../isxander/yacl3/gui/utils/UndoRedoHelper.java   | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 common/src/main/java/dev/isxander/yacl3/gui/utils/UndoRedoHelper.java

(limited to 'common/src/main/java/dev/isxander/yacl3/gui/utils')

diff --git a/common/src/main/java/dev/isxander/yacl3/gui/utils/UndoRedoHelper.java b/common/src/main/java/dev/isxander/yacl3/gui/utils/UndoRedoHelper.java
new file mode 100644
index 0000000..3328c16
--- /dev/null
+++ b/common/src/main/java/dev/isxander/yacl3/gui/utils/UndoRedoHelper.java
@@ -0,0 +1,42 @@
+package dev.isxander.yacl3.gui.utils;
+
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class UndoRedoHelper {
+    private final List<FieldState> history = new ArrayList<>();
+    private int index = 0;
+
+    public UndoRedoHelper(String text, int cursorPos, int selectionLength) {
+        history.add(new FieldState(text, cursorPos, selectionLength));
+    }
+
+    public void save(String text, int cursorPos, int selectionLength) {
+        int max = history.size();
+        history.subList(index, max).clear();
+        history.add(new FieldState(text, cursorPos, selectionLength));
+        index++;
+    }
+
+    public @Nullable FieldState undo() {
+        index--;
+        index = Math.max(index, 0);
+
+        if (history.isEmpty())
+            return null;
+        return history.get(index);
+    }
+
+    public @Nullable FieldState redo() {
+        if (index < history.size() - 1) {
+            index++;
+            return history.get(index);
+        } else {
+            return null;
+        }
+    }
+
+    public record FieldState(String text, int cursorPos, int selectionLength) {}
+}
-- 
cgit