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#pragma once
#include "RenderObject.h"
namespace cru::ui::render {
template <typename TChildLayoutData>
class LayoutRenderObject : public RenderObject {
public:
using ChildLayoutData = TChildLayoutData;
private:
struct ChildData {
/**
* May be nullptr.
*/
RenderObject* render_object;
ChildLayoutData layout_data;
EventHandlerRevokerListGuard event_guard;
};
protected:
LayoutRenderObject(std::string name) : RenderObject(std::move(name)) {}
public:
Index GetChildCount() { return static_cast<Index>(children_.size()); }
RenderObject* GetChildAt(Index position) {
Expects(position >= 0 && position < GetChildCount());
return children_[position].render_object;
}
void AddChild(RenderObject* render_object, Index position) {
if (position < 0) position = 0;
if (position > GetChildCount()) position = GetChildCount();
auto iter = children_.insert(children_.begin() + position,
ChildData{render_object, ChildLayoutData()});
render_object->SetParent(this);
iter->event_guard +=
render_object->DestroyEvent()->AddSpyOnlyHandler([this, render_object] {
auto iter = std::ranges::find_if(
children_, [render_object](const ChildData& data) {
return data.render_object == render_object;
});
if (iter != children_.cend()) {
iter->render_object = nullptr;
}
});
InvalidateLayout();
}
void RemoveChild(Index position) {
Expects(position >= 0 && position < GetChildCount());
auto render_object = children_[position].render_object;
if (render_object) {
render_object->SetParent(nullptr);
}
children_.erase(children_.begin() + position);
InvalidateLayout();
}
void ClearChildren() {
for (const auto& child : children_) {
auto render_object = child.render_object;
if (render_object) {
render_object->SetParent(nullptr);
}
}
children_.clear();
InvalidateLayout();
}
const ChildLayoutData& GetChildLayoutDataAt(Index position) {
Expects(position >= 0 && position < GetChildCount());
return children_[position].layout_data;
}
void SetChildLayoutDataAt(Index position, ChildLayoutData data) {
Expects(position >= 0 && position < GetChildCount());
children_[position].layout_data = std::move(data);
InvalidateLayout();
}
RenderObject* HitTest(const Point& point) override {
const auto child_count = GetChildCount();
for (auto i = child_count - 1; i >= 0; --i) {
const auto child = GetChildAt(i);
const auto result = child->HitTest(point - child->GetOffset());
if (result != nullptr) {
return result;
}
}
return GetPaddingRect().IsPointInside(point) ? this : nullptr;
}
protected:
void OnDraw(RenderObjectDrawContext& context) override {
auto painter = context.painter;
for (const auto& child : children_) {
context.DrawChild(child.render_object);
}
}
private:
std::vector<ChildData> children_;
};
} // namespace cru::ui::render
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