New Undo / Redo stack for the gizmos. The Gizmo specific stack is

entered with Plater::enter_gizmos_stack(), and left with
Plater::enter_gizmos_stack(). Other than that, the 2nd Undo / Redo
stack is transparent to the user of the Plater.

WIP: Currently the Gizmo stack takes a snapshot of the whole scene on
Plater::enter_gizmos_stack(). While it should work, it may be cheaper
to modify the Undo/Redo stack to only take a snapshot of the gizmos
in the Gizmo mode.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/slic3r/Utils/UndoRedo.hpp b/src/slic3r/Utils/UndoRedo.hpp
index 37cc5a049..558449003 100644
--- a/src/slic3r/Utils/UndoRedo.hpp
+++ b/src/slic3r/Utils/UndoRedo.hpp
@@ -71,7 +71,8 @@ struct Snapshot
 
 // Excerpt of Slic3r::GUI::Selection for serialization onto the Undo / Redo stack.
 struct Selection : public Slic3r::ObjectBase {
-	unsigned char							mode;
+	void clear() { mode = 0; volumes_and_instances.clear(); }
+	unsigned char							mode = 0;
 	std::vector<std::pair<size_t, size_t>>	volumes_and_instances;
 	template<class Archive> void serialize(Archive &ar) { ar(mode, volumes_and_instances); }
 };
@@ -86,6 +87,9 @@ public:
 	Stack();
 	~Stack();
 
+	void clear();
+	bool empty() const;
+
 	// Set maximum memory threshold. If the threshold is exceeded, least recently used snapshots are released.
 	void set_memory_limit(size_t memsize);
 	size_t get_memory_limit() const;