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https://github.com/ArthurSonzogni/FTXUI.git
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422c30cd34
Taken out of: https://github.com/ArthurSonzogni/FTXUI/pull/600 Co-authored-by: LostInCompilation <12819635+LostInCompilation@users.noreply.github.com>
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
#include <algorithm> // for max
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#include <memory> // for make_shared, __shared_ptr_access
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#include <string> // for string
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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 Element, vscroll_indicator
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#include "ftxui/dom/node.hpp" // for Node, Elements
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#include "ftxui/dom/node_decorator.hpp" // for NodeDecorator
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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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#include "ftxui/screen/screen.hpp" // for Screen, Pixel
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namespace ftxui {
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/// @brief Add a filter that will invert the foreground and the background
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/// colors.
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/// @ingroup dom
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Element vscroll_indicator(Element child) {
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class Impl : public NodeDecorator {
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using NodeDecorator::NodeDecorator;
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void ComputeRequirement() override {
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NodeDecorator::ComputeRequirement();
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requirement_ = children_[0]->requirement();
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requirement_.min_x++;
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}
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void SetBox(Box box) override {
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box_ = box;
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box.x_max--;
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children_[0]->SetBox(box);
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}
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void Render(Screen& screen) final {
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NodeDecorator::Render(screen);
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const Box& stencil = screen.stencil;
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const int size_inner = box_.y_max - box_.y_min;
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if (size_inner <= 0) {
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return;
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}
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const int size_outter = stencil.y_max - stencil.y_min + 1;
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if (size_outter >= size_inner) {
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return;
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}
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int size = 2 * size_outter * size_outter / size_inner;
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size = std::max(size, 1);
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const int start_y =
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2 * stencil.y_min + //
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2 * (stencil.y_min - box_.y_min) * size_outter / size_inner;
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const int x = stencil.x_max;
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for (int y = stencil.y_min; y <= stencil.y_max; ++y) {
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const int y_up = 2 * y + 0;
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const int y_down = 2 * y + 1;
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const bool up = (start_y <= y_up) && (y_up <= start_y + size);
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const bool down = (start_y <= y_down) && (y_down <= start_y + size);
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const char* c = up ? (down ? "┃" : "╹") : (down ? "╻" : " "); // NOLINT
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screen.PixelAt(x, y) = Pixel();
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screen.PixelAt(x, y).character = c;
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}
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}
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};
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return std::make_shared<Impl>(std::move(child));
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}
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} // namespace ftxui
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// Copyright 2021 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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