FTXUI 6.1.9 C++ functional terminal UI.

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src/ftxui/dom/size.cpp
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1// Copyright 2020 Arthur Sonzogni. All rights reserved.
2// Use of this source code is governed by the MIT license that can be found in
3// the LICENSE file.
4#include <algorithm> // for min, max
5#include <memory> // for make_shared, __shared_ptr_access
6#include <utility> // for move
7
8#include "ftxui/dom/elements.hpp" // for Constraint, WidthOrHeight, EQUAL, GREATER_THAN, LESS_THAN, WIDTH, unpack, Decorator, Element, size
9#include "ftxui/dom/node.hpp" // for Node, Elements
10#include "ftxui/dom/requirement.hpp" // for Requirement
11#include "ftxui/screen/box.hpp" // for Box
12
13 namespace ftxui {
14
15 namespace {
16 class Size : public Node {
17 public:
18 Size(Element child, WidthOrHeight direction, Constraint constraint, int value)
19 : Node(unpack(std::move(child))),
20 direction_(direction),
21 constraint_(constraint),
22 value_(std::max(0, value)) {}
23
24 void ComputeRequirement() override {
25 Node::ComputeRequirement();
26 requirement_ = children_[0]->requirement();
27
28 auto& value = direction_ == WIDTH ? requirement_.min_x : requirement_.min_y;
29
30 switch (constraint_) {
31 case LESS_THAN:
32 value = std::min(value, value_);
33 break;
34 case EQUAL:
35 value = value_;
36 break;
37 case GREATER_THAN:
38 value = std::max(value, value_);
39 break;
40 }
41
42 if (direction_ == WIDTH) {
43 requirement_.flex_grow_x = 0;
44 requirement_.flex_shrink_x = 0;
45 } else {
46 requirement_.flex_grow_y = 0;
47 requirement_.flex_shrink_y = 0;
48 }
49 }
50
51 void SetBox(Box box) override {
52 Node::SetBox(box);
53
54 if (direction_ == WIDTH) {
55 switch (constraint_) {
56 case LESS_THAN:
57 case EQUAL:
58 box.x_max = std::min(box.x_min + value_ + 1, box.x_max);
59 break;
60 case GREATER_THAN:
61 break;
62 }
63 } else {
64 switch (constraint_) {
65 case LESS_THAN:
66 case EQUAL:
67 box.y_max = std::min(box.y_min + value_ + 1, box.y_max);
68 break;
69 case GREATER_THAN:
70 break;
71 }
72 }
73 children_[0]->SetBox(box);
74 }
75
76 private:
77 WidthOrHeight direction_;
78 Constraint constraint_;
79 int value_;
80};
81} // namespace
82
83/// @brief Apply a constraint on the size of an element.
84/// @param direction Whether the WIDTH of the HEIGHT of the element must be
85/// constrained.
86/// @param constraint The type of constaint.
87/// @param value The value.
88/// @ingroup dom
89 Decorator size(WidthOrHeight direction, Constraint constraint, int value) {
90 return [=](Element e) {
91 return std::make_shared<Size>(std::move(e), direction, constraint, value);
92 };
93}
94
95} // namespace ftxui
box.hpp
elements.hpp
ftxui::Node::SetBox
virtual void SetBox(Box box)
Assign a position and a dimension to an element for drawing.
Definition node.cpp:41
ftxui::Node::ComputeRequirement
virtual void ComputeRequirement()
Compute how much space an element needs.
Definition node.cpp:20
ftxui::size
Decorator size(WidthOrHeight, Constraint, int value)
Apply a constraint on the size of an element.
Definition src/ftxui/dom/size.cpp:89
ftxui
The FTXUI ftxui:: namespace.
Definition animation.hpp:10
ftxui::WidthOrHeight
WidthOrHeight
Definition elements.hpp:161
ftxui::WIDTH
@ WIDTH
Definition elements.hpp:161
ftxui::Decorator
std::function< Element(Element)> Decorator
Definition elements.hpp:24
ftxui::Element
std::shared_ptr< Node > Element
Definition elements.hpp:22
ftxui::Constraint
Constraint
Definition elements.hpp:162
ftxui::LESS_THAN
@ LESS_THAN
Definition elements.hpp:162
ftxui::EQUAL
@ EQUAL
Definition elements.hpp:162
ftxui::GREATER_THAN
@ GREATER_THAN
Definition elements.hpp:162
node.hpp
requirement.hpp
value_
std::string value_
Definition src/ftxui/dom/separator.cpp:51