Moved hasUndo and hasRedo from Editor::Paint to Editor::Scene.

Telegram/SourceFiles/editor/editor_paint.cpp

@@ -81,8 +81,8 @@ Paint::Paint(
 			(*it)->setVisible(!isUndo);
 		}
 
-		_hasUndo = hasUndo();
-		_hasRedo = hasRedo();
+		_hasUndo = _scene->hasUndo();
+		_hasRedo = _scene->hasRedo();
 	}, lifetime());
 
 	controllers->undoController->setCanPerformChanges(rpl::merge(
@@ -217,16 +217,6 @@ void Paint::keepResult() {
 	}) | ranges::to_vector;
 }
 
-bool Paint::hasUndo() const {
-	return ranges::any_of(_scene->items(), &QGraphicsItem::isVisible);
-}
-
-bool Paint::hasRedo() const {
-	return ranges::any_of(
-		_scene->items(),
-		[=](const ItemPtr &i) { return isItemHidden(i); });
-}
-
 void Paint::clearRedoList() {
 	const auto items = _scene->items(Qt::AscendingOrder);
 	auto &&filtered = ranges::views::all(
@@ -252,8 +242,8 @@ bool Paint::isItemToRemove(const ItemPtr &item) const {
 }
 
 void Paint::updateUndoState() {
-	_hasUndo = hasUndo();
-	_hasRedo = hasRedo();
+	_hasUndo = _scene->hasUndo();
+	_hasRedo = _scene->hasRedo();
 }
 
 void Paint::applyBrush(const Brush &brush) {

Telegram/SourceFiles/editor/editor_paint.h

@@ -49,8 +49,6 @@ private:
 
 	ItemBase::Data itemBaseData() const;
 
-	bool hasUndo() const;
-	bool hasRedo() const;
 	void clearRedoList();
 
 	bool isItemToRemove(const std::shared_ptr<QGraphicsItem> &item) const;

Telegram/SourceFiles/editor/scene/scene.cpp

@@ -163,6 +163,14 @@ void Scene::restoreItemsState(SaveState state) {
 	}
 }
 
+bool Scene::hasUndo() const {
+	return ranges::any_of(_items, &NumberedItem::isNormalStatus);
+}
+
+bool Scene::hasRedo() const {
+	return ranges::any_of(_items, &NumberedItem::isUndidStatus);
+}
+
 Scene::~Scene() {
 	// Prevent destroying by scene of all items.
 	QGraphicsScene::removeItem(_canvas.get());

Telegram/SourceFiles/editor/scene/scene.h

@@ -49,6 +49,9 @@ public:
 
 	void saveItemsState(SaveState state);
 	void restoreItemsState(SaveState state);
+
+	[[nodiscard]] bool hasUndo() const;
+	[[nodiscard]] bool hasRedo() const;
 protected:
 	void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
 	void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;