improve progress bar, refactor node destruction, simplify layers export

src/node.cpp

@@ -41,6 +41,7 @@ void Node::app_redraw()
 {
     App::I->redraw = true;
     App::I->ui_cv.notify_all();
+    App::I->render_cv.notify_all();
 }
 
 void Node::watch(std::function<bool(Node*)> observer)
@@ -58,20 +59,17 @@ void Node::watch(std::function<bool(Node*)> observer)
 
 void Node::destroy()
 {
-    m_destroyed = true;
+    auto children_copy = m_children;
+    for (auto c : children_copy)
+        c->destroy();
     mouse_release();
     key_release();
-}
-
-void Node::destroy_immediate()
-{
-    for (auto c : m_children)
-        c->destroy_immediate();
+    remove_from_parent();
+    app_redraw();
 }
 
 Node* Node::root()
 {
-
     Node* ret = this;
     while (ret->m_parent)
         ret = ret->m_parent;
@@ -657,7 +655,6 @@ Node::Node(Node&& o)
     m_flood_events = o.m_flood_events;
     m_force_mouse_capture = o.m_force_mouse_capture;
     m_capture_children = o.m_capture_children;
-    m_destroyed = false;// o.m_destroyed;
 
     m_scale = o.m_scale;
     m_pos_origin = o.m_pos_origin;
@@ -1007,16 +1004,6 @@ void Node::update_internal(const glm::vec2& origin, const glm::mat4& proj, float
     m_mvp = proj * pos * scale * pivot * prescale;
     m_proj = proj;
 
-    for (int i = 0; i < m_children.size(); i++)
-    {
-        if (m_children[i]->m_destroyed)
-        {
-            m_children[i]->destroy_immediate();
-            remove_child(m_children[i].get());
-            i--;
-        }
-    }
-
     if (m_size != old_size || m_zoom != zoom)
     {
         m_zoom = zoom;
@@ -1370,14 +1357,11 @@ void Node::clone_copy(Node* dest) const
     dest->m_mvp = m_mvp;
     dest->m_mouse_inside = m_mouse_inside;
     dest->m_capture_children = m_capture_children;
-    dest->m_destroyed = false;// m_destroyed;
     dest->m_scale = m_scale;
     dest->m_pos_origin = m_pos_origin;
     dest->m_pos_offset = m_pos_offset;
     dest->m_pos_offset_childred = m_pos_offset_childred;
     dest->m_clip_uncut = m_clip_uncut;
-
-
 }
 
 void Node::clone_children(Node* dest) const