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https://github.com/ArthurSonzogni/FTXUI.git
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96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
#include <algorithm> // for min, max
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#include <memory> // for make_shared, __shared_ptr_access
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#include <utility> // for move
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#include <vector> // for __alloc_traits<>::value_type
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#include "ftxui/dom/elements.hpp" // for Constraint, Direction, EQUAL, GREATER_THAN, LESS_THAN, WIDTH, unpack, Decorator, Element, size
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#include "ftxui/dom/node.hpp" // for Node, Elements
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#include "ftxui/dom/requirement.hpp" // for Requirement
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#include "ftxui/screen/box.hpp" // for Box
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namespace ftxui {
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class Size : public Node {
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public:
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Size(Element child, Direction direction, Constraint constraint, int value)
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: Node(unpack(std::move(child))),
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direction_(direction),
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constraint_(constraint),
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value_(value) {}
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void ComputeRequirement() override {
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Node::ComputeRequirement();
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requirement_ = children_[0]->requirement();
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auto& value = direction_ == WIDTH ? requirement_.min_x : requirement_.min_y;
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switch (constraint_) {
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case LESS_THAN:
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value = std::min(value, value_);
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break;
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case EQUAL:
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value = value_;
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break;
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case GREATER_THAN:
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value = std::max(value, value_);
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break;
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}
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if (direction_ == WIDTH) {
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requirement_.flex_grow_x = 0;
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requirement_.flex_shrink_x = 0;
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} else {
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requirement_.flex_grow_y = 0;
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requirement_.flex_shrink_y = 0;
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}
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}
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void SetBox(Box box) override {
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Node::SetBox(box);
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if (direction_ == WIDTH) {
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switch (constraint_) {
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case LESS_THAN:
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case EQUAL:
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box.x_max = std::min(box.x_min + value_ + 1, box.x_max);
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break;
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case GREATER_THAN:
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break;
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}
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} else {
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switch (constraint_) {
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case LESS_THAN:
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case EQUAL:
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box.y_max = std::min(box.y_min + value_ + 1, box.y_max);
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break;
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case GREATER_THAN:
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break;
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}
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}
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children_[0]->SetBox(box);
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}
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private:
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Direction direction_;
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Constraint constraint_;
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int value_;
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};
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/// @brief Apply a constraint on the size of an element.
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/// @param direction Whether the WIDTH of the HEIGHT of the element must be
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/// constrained.
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/// @param constraint The type of constaint.
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/// @param value The value.
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/// @ingroup dom
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Decorator size(Direction direction, Constraint constraint, int value) {
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return [=](Element e) {
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return std::make_shared<Size>(std::move(e), direction, constraint, value);
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};
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}
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} // namespace ftxui
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// Copyright 2020 Arthur Sonzogni. All rights reserved.
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// Use of this source code is governed by the MIT license that can be found in
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// the LICENSE file.
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