Create new component system & initial settings window

src/dusk/ui/component.cpp

@@ -0,0 +1,45 @@
+#include "component.hpp"
+
+#include "aurora/lib/dolphin/gd/gd.hpp"
+
+namespace dusk::ui {
+static aurora::Module Log{"dusk::ui::component"};
+
+Component::Component(Rml::Element* root) : mRoot(root) {}
+
+Component::~Component() = default;
+
+void Component::update() {
+    for (const auto& child : mChildren) {
+        child->update();
+    }
+}
+
+Rml::Element* Component::append(Rml::Element* parent, const Rml::String& tag) {
+    if (parent == nullptr) {
+        return nullptr;
+    }
+    auto* doc = parent->GetOwnerDocument();
+    if (doc == nullptr) {
+        return nullptr;
+    }
+    return parent->AppendChild(doc->CreateElement(tag));
+}
+
+void Component::listen(Rml::Element* element, Rml::EventId event,
+    ScopedEventListener::Callback callback, bool capture) {
+    if (element == nullptr) {
+        element = mRoot;
+    }
+    mListeners.emplace_back(
+        std::make_unique<ScopedEventListener>(element, event, std::move(callback), capture));
+}
+
+void Component::clear_children() {
+    mChildren.clear();
+    while (mRoot->GetNumChildren() > 0) {
+        mRoot->RemoveChild(mRoot->GetFirstChild());
+    }
+}
+
+}  // namespace dusk::ui