Mirror/FTXUI
1
0
Fork 0
mirror of https://github.com/ArthurSonzogni/FTXUI.git synced 2025-09-28 16:29:34 +08:00
Code Issues Packages Projects Releases Wiki Activity

Reland "Factorize box layout functions. (#185)"" (#187)

Browse Source 
This reverts commit a7095970bc.
This commit is contained in:
Arthur Sonzogni
2021-08-10 22:15:24 +02:00
committed by GitHub
parent 98f49a581c
commit 79b8928f6e
5 changed files with 141 additions and 166 deletions
Download Patch File Download Diff File Expand all files Collapse all files

98
src/ftxui/dom/hbox.cpp
View File

@@ -3,6 +3,7 @@
#include <utility> // for move
#include <vector> // for vector
#include "ftxui/dom/box_helper.hpp" // for Box
#include "ftxui/dom/elements.hpp" // for Element, Elements, hbox
#include "ftxui/dom/node.hpp" // for Node
#include "ftxui/dom/requirement.hpp" // for Requirement
@@ -38,92 +39,23 @@ class HBox : public Node {
void SetBox(Box box) override {
Node::SetBox(box);
int space = box.x_max - box.x_min + 1;
int extra_space = space - requirement_.min_x;
int size = 0;
int flex_grow_sum = 0;
int flex_shrink_sum = 0;
int flex_shrink_size = 0;
for (auto& child : children_) {
const Requirement& r = child->requirement();
flex_grow_sum += r.flex_grow_x;
flex_shrink_sum += r.min_x * r.flex_shrink_x;
if (r.flex_shrink_x) {
flex_shrink_size += r.min_x;
}
size += r.min_x;
std::vector<box_helper::Element> elements(children_.size());
for (size_t i = 0; i < children_.size(); ++i) {
auto& element = elements[i];
const auto& requirement = children_[i]->requirement();
element.min_size = requirement.min_x;
element.flex_grow = requirement.flex_grow_x;
element.flex_shrink = requirement.flex_shrink_x;
}
int target_size = box.x_max - box.x_min + 1;
box_helper::Compute(&elements, target_size);
if (extra_space >= 0)
SetBoxGrow(box, extra_space, flex_grow_sum);
else if (flex_shrink_size + extra_space >= 0)
SetBoxShrinkEasy(box, extra_space, flex_shrink_sum);
else
SetBoxShrinkHard(box, extra_space + flex_shrink_size,
size - flex_shrink_size);
}
void SetBoxGrow(Box box, int extra_space, int flex_grow_sum) {
int x = box.x_min;
for (auto& child : children_) {
Box child_box = box;
const Requirement& r = child->requirement();
int added_space =
extra_space * r.flex_grow_x / std::max(flex_grow_sum, 1);
extra_space -= added_space;
flex_grow_sum -= r.flex_grow_x;
child_box.x_min = x;
child_box.x_max = x + r.min_x + added_space - 1;
child->SetBox(child_box);
x = child_box.x_max + 1;
}
}
void SetBoxShrinkEasy(Box box, int extra_space, int flex_shrink_sum) {
int x = box.x_min;
for (auto& child : children_) {
Box child_box = box;
const Requirement& r = child->requirement();
int added_space = extra_space * r.min_x * r.flex_shrink_x /
std::max(flex_shrink_sum, 1);
extra_space -= added_space;
flex_shrink_sum -= r.flex_shrink_x * r.min_x;
child_box.x_min = x;
child_box.x_max = x + r.min_x + added_space - 1;
child->SetBox(child_box);
x = child_box.x_max + 1;
}
}
void SetBoxShrinkHard(Box box, int extra_space, int size) {
int x = box.x_min;
for (auto& child : children_) {
Box child_box = box;
const Requirement& r = child->requirement();
if (r.flex_shrink_x) {
child_box.x_min = x;
child_box.x_max = x - 1;
child->SetBox(child_box);
continue;
}
int added_space = extra_space * r.min_x / std::max(1, size);
extra_space -= added_space;
size -= r.min_x;
child_box.x_min = x;
child_box.x_max = x + r.min_x + added_space - 1;
child->SetBox(child_box);
x = child_box.x_max + 1;
for (size_t i = 0; i < children_.size(); ++i) {
box.x_min = x;
box.x_max = x + elements[i].size - 1;
children_[i]->SetBox(box);
x = box.x_max + 1;
}
}
};