More-or-less complete API for YACL auto-gen

1 files changed, 42 insertions, 0 deletions

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) {}
+}