FTXUI/include/ftxui/dom/node.hpp
2022-03-31 02:17:43 +02:00

68 lines
1.7 KiB
C++

#ifndef FTXUI_DOM_NODE_HPP
#define FTXUI_DOM_NODE_HPP
#include <memory> // for shared_ptr
#include <vector> // for vector
#include "ftxui/dom/requirement.hpp" // for Requirement
#include "ftxui/screen/box.hpp" // for Box
#include "ftxui/screen/screen.hpp"
namespace ftxui {
class Node;
class Screen;
using Element = std::shared_ptr<Node>;
using Elements = std::vector<Element>;
class Node {
public:
Node();
Node(Elements children);
Node(const Node&) = delete;
Node(const Node&&) = delete;
Node& operator=(const Node&) = delete;
Node& operator=(const Node&&) = delete;
virtual ~Node();
// Step 1: Compute layout requirement. Tell parent what dimensions this
// element wants to be.
// Propagated from Children to Parents.
virtual void ComputeRequirement();
Requirement requirement() { return requirement_; }
// Step 2: Assign this element its final dimensions.
// Propagated from Parents to Children.
virtual void SetBox(Box box);
// Step 3: Draw this element.
virtual void Render(Screen& screen);
// Layout may not resolve within a single iteration for some elements. This
// allows them to request additionnal iterations. This signal must be
// forwarded to children at least once.
struct Status {
int iteration = 0;
bool need_iteration = false;
};
virtual void Check(Status* status);
protected:
Elements children_;
Requirement requirement_;
Box box_;
};
void Render(Screen& screen, const Element& element);
void Render(Screen& screen, Node* node);
} // namespace ftxui
#endif // FTXUI_DOM_NODE_HPP
// Copyright 2020 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.