From db2a2258559289f99e2d8f5bdea445660c3ebe27 Mon Sep 17 00:00:00 2001
From: Gary Talent <gary@drinkingtea.net>
Date: Sat, 19 Feb 2022 03:05:45 -0600
Subject: [PATCH] [nostalgia/studio] Add redo and undo triggered signals to
 UndoStack

---
 src/nostalgia/studio/lib/undostack.cpp | 2 ++
 src/nostalgia/studio/lib/undostack.hpp | 8 ++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/nostalgia/studio/lib/undostack.cpp b/src/nostalgia/studio/lib/undostack.cpp
index dd5bb88e0..a4817245e 100644
--- a/src/nostalgia/studio/lib/undostack.cpp
+++ b/src/nostalgia/studio/lib/undostack.cpp
@@ -19,12 +19,14 @@ void UndoStack::redo() noexcept {
 	if (m_stackIdx < m_stack.size()) {
 		m_stack[m_stackIdx++]->redo();
 	}
+	redoTriggered.emit();
 }
 
 void UndoStack::undo() noexcept {
 	if (m_stackIdx) {
 		m_stack[--m_stackIdx]->undo();
 	}
+	undoTriggered.emit();
 }
 
 }
\ No newline at end of file
diff --git a/src/nostalgia/studio/lib/undostack.hpp b/src/nostalgia/studio/lib/undostack.hpp
index c08ae3166..71bc64263 100644
--- a/src/nostalgia/studio/lib/undostack.hpp
+++ b/src/nostalgia/studio/lib/undostack.hpp
@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <ox/event/signal.hpp>
 #include <ox/std/error.hpp>
 #include <ox/std/memory.hpp>
 #include <ox/std/vector.hpp>
@@ -30,14 +31,17 @@ class UndoStack {
 		void undo() noexcept;
 
 		[[nodiscard]]
-		constexpr bool canRedo() noexcept {
+		constexpr bool canRedo() const noexcept {
 			return m_stackIdx < m_stack.size();
 		}
 
 		[[nodiscard]]
-		constexpr bool canUndo() noexcept {
+		constexpr bool canUndo() const noexcept {
 			return m_stackIdx;
 		}
+
+		ox::Signal<ox::Error()> redoTriggered;
+		ox::Signal<ox::Error()> undoTriggered;
 };
 
 }
\ No newline at end of file