mirror of
https://github.com/ArthurSonzogni/FTXUI.git
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76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
// 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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#include <algorithm>
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#include "ftxui/dom/elements.hpp"
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#include "ftxui/dom/node.hpp"
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namespace ftxui {
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class HBox : public Node {
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public:
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HBox(Elements children) : Node(std::move(children)) {}
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~HBox() {}
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void ComputeRequirement() override {
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requirement_.min.x = 0;
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requirement_.min.y = 0;
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requirement_.flex.x = 1;
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requirement_.flex.y = 0;
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for (auto& child : children) {
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child->ComputeRequirement();
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if (requirement_.selection < child->requirement().selection) {
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requirement_.selection = child->requirement().selection;
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requirement_.selected_box = child->requirement().selected_box;
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requirement_.selected_box.x_min += requirement_.min.x;
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requirement_.selected_box.x_max += requirement_.min.x;
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}
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requirement_.min.x += child->requirement().min.x;
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requirement_.min.y =
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std::max(requirement_.min.y, child->requirement().min.y);
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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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int flex_sum = 0;
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for (auto& child : children)
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flex_sum += child->requirement().flex.x;
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int space = box.x_max - box.x_min + 1;
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int extra_space = space - requirement_.min.x;
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int remaining_flex = flex_sum;
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int remaining_extra_space = extra_space;
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int x = box.x_min;
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for (auto& child : children) {
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Box child_box = box;
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child_box.x_min = x;
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child_box.x_max = x + child->requirement().min.x - 1;
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if (child->requirement().flex.x && remaining_extra_space > 0) {
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int added_space = remaining_extra_space * child->requirement().flex.x /
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remaining_flex;
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remaining_extra_space -= added_space;
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remaining_flex -= child->requirement().flex.x;
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child_box.x_max += added_space;
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}
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child_box.x_max = std::min(child_box.x_max, box.x_max);
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child->SetBox(child_box);
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x = child_box.x_max + 1;
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}
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}
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};
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std::unique_ptr<Node> hbox(Elements children) {
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return std::make_unique<HBox>(std::move(children));
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}
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} // namespace ftxui
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