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#pragma once
#include "Control.h"
namespace cru::ui::controls {
template <typename TRenderObject>
class SingleChildControl : public Control {
protected:
SingleChildControl() : container_render_object_(new TRenderObject()) {
container_render_object_->SetAttachedControl(this);
}
public:
CRU_DELETE_COPY(SingleChildControl)
CRU_DELETE_MOVE(SingleChildControl)
~SingleChildControl() override { SetChild(nullptr); }
Control* GetChild() const { return child_; }
void SetChild(Control* child) {
if (child == child_) return;
assert(child == nullptr || child->GetParent() == nullptr);
if (child_) {
child_->SetParent(nullptr);
}
child_ = child;
if (child) {
child->SetParent(this);
}
container_render_object_->SetChild(
child == nullptr ? nullptr : child->GetRenderObject());
}
render::RenderObject* GetRenderObject() const override {
return container_render_object_.get();
}
TRenderObject* GetContainerRenderObject() const {
return container_render_object_.get();
}
void ForEachChild(const std::function<void(Control*)>& predicate) override {
if (child_) {
predicate(child_);
}
}
void RemoveChild(Control* child) override {
if (child_ == child) {
SetChild(nullptr);
}
}
private:
Control* child_ = nullptr;
std::unique_ptr<TRenderObject> container_render_object_;
};
} // namespace cru::ui::controls
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