implement mementos snapshots

1 files changed, 23 insertions, 0 deletions

diff --git a/Canvas.cpp b/Canvas.cpp
index b7cc8a5..86b5bec 100644
--- a/Canvas.cpp
+++ b/Canvas.cpp
@@ -109,3 +109,26 @@ void Canvas::update_tiles() {
 	}
 }
 
+Memories Canvas::save() {
+	Memories data;
+	data.push_back(make_unique<CanvasDataMemento>(this->data));
+	for (Tile * tile : this->tiles) {
+		data.push_back(make_unique<TileDataMemento>(tile->data));
+	}
+	return data;
+}
+
+void Canvas::restore(const Memories & memories) {
+	for (const unique_ptr<Memento> & memory : memories) {
+		auto canvas = dynamic_cast<CanvasDataMemento *>(memory.get());
+		if (canvas != nullptr) {
+			this->set_data(canvas->data);
+		}
+
+		auto tile = dynamic_cast<TileDataMemento *>(memory.get());
+		if (tile != nullptr) {
+			this->set_tile(tile->data);
+		}
+	}
+}
+