ability to reparent elements

src/ui/elements/ui_element.cpp

@@ -24,6 +24,7 @@ Element::Element(Element* parent, uint32_t events_enabled, Rml::String base_clas
     if (parent != nullptr) {
         base = parent->base->AppendChild(std::move(base_owning));
         parent->add_child(this);
+        this->parent = parent;
     }
     else {
         base = base_owning.get();
@@ -59,6 +60,19 @@ void Element::add_child(Element *child) {
     }
 }
 
+void Element::set_parent(Element *new_parent) {
+    if (parent != nullptr) {
+        parent->remove_child(this, false);
+        base_owning = parent->base->RemoveChild(base);
+
+        parent = new_parent;
+    
+        base = parent->base->AppendChild(std::move(base_owning), true);
+        parent->add_child(this);
+    }
+
+}
+
 void Element::set_property(Rml::PropertyId property_id, const Rml::Property &property) {
     assert(base != nullptr);
 
@@ -306,7 +320,7 @@ void Element::clear_children() {
     children.clear();
 }
 
-bool Element::remove_child(ResourceId child) {
+bool Element::remove_child(ResourceId child, bool remove_from_context) {
     bool found = false;
 
     ContextId context = get_current_context();
@@ -315,7 +329,9 @@ bool Element::remove_child(ResourceId child) {
         Element* cur_child = *it;
         if (cur_child->get_resource_id() == child) {
             children.erase(it);
-            context.destroy_resource(cur_child);
+            if (remove_from_context) {
+                context.destroy_resource(cur_child);
+            }
             found = true;
             break;
         }
@@ -541,4 +557,8 @@ Element Element::get_element_with_tag_name(std::string_view tag_name) {
     throw std::runtime_error("Select element has no child with the specified tag name");
 }
 
+bool Element::is_pseudo_class_set(Rml::String pseudo_class) {
+    return base->IsPseudoClassSet(pseudo_class);
+}
+
 } // namespace recompui

src/ui/elements/ui_element.h

@@ -32,6 +32,7 @@ private:
     std::unordered_set<std::string_view> style_active_set;
     std::unordered_multimap<std::string_view, uint32_t> style_name_index_map;
     std::vector<UICallback> callbacks;
+    Element *parent = nullptr;
     std::vector<Element *> children;
     std::string id;
     bool shim = false;
@@ -67,8 +68,9 @@ public:
     Element(Element* parent, uint32_t events_enabled = 0, Rml::String base_class = "div", bool can_set_text = false);
     virtual ~Element();
     void clear_children();
-    bool remove_child(ResourceId child);
-    bool remove_child(Element *child) { return remove_child(child->get_resource_id()); }
+    bool remove_child(ResourceId child, bool remove_from_context = true);
+    bool remove_child(Element *child, bool remove_from_context = true) { return remove_child(child->get_resource_id(), remove_from_context); }
+    void set_parent(Element *new_parent);
     void add_style(Style *style, std::string_view style_name);
     void add_style(Style *style, const std::initializer_list<std::string_view> &style_names);
     Element get_element_with_tag_name(std::string_view tag_name);
@@ -100,6 +102,7 @@ public:
     void set_input_value_float(float val) { set_input_value(val); }
     void set_input_value_double(double val) { set_input_value(val); }
     const std::string& get_id() { return id; }
+    bool is_pseudo_class_set(Rml::String pseudo_class);
 
     Element *select_add_option(std::string_view text, std::string_view value);
 };