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text.cpp
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// Copyright 2020 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.
#include <algorithm> // for min
#include <memory> // for make_shared
#include <sstream>
#include <string> // for string, wstring
#include <utility> // for move
#include "ftxui/dom/deprecated.hpp" // for text, vtext
#include "ftxui/dom/elements.hpp" // for Element, text, vtext
#include "ftxui/dom/node.hpp" // for Node
#include "ftxui/dom/requirement.hpp" // for Requirement
#include "ftxui/dom/selection.hpp" // for Selection
#include "ftxui/screen/box.hpp" // for Box
#include "ftxui/screen/screen.hpp" // for Pixel, Screen
#include "ftxui/screen/string.hpp" // for string_width, Utf8ToGlyphs, to_string
namespace ftxui {
namespace {
using ftxui::Screen;
class Text : public Node {
public:
explicit Text(std::string text) : text_(std::move(text)) {}
void ComputeRequirement() override {
requirement_.min_x = string_width(text_);
requirement_.min_y = 1;
has_selection = false;
}
void Select(Selection& selection) override {
if (Box::Intersection(selection.GetBox(), box_).IsEmpty()) {
return;
}
const Selection selection_saturated = selection.SaturateHorizontal(box_);
has_selection = true;
selection_start_ = selection_saturated.GetBox().x_min;
selection_end_ = selection_saturated.GetBox().x_max;
std::stringstream ss;
int x = box_.x_min;
for (const auto& cell : Utf8ToGlyphs(text_)) {
if (cell == "\n") {
continue;
}
if (selection_start_ <= x && x <= selection_end_) {
ss << cell;
}
x++;
}
selection.AddPart(ss.str(), box_.y_min, selection_start_, selection_end_);
}
void Render(Screen& screen) override {
int x = box_.x_min;
const int y = box_.y_min;
if (y > box_.y_max) {
return;
}
for (const auto& cell : Utf8ToGlyphs(text_)) {
if (x > box_.x_max) {
break;
}
if (cell == "\n") {
continue;
}
screen.PixelAt(x, y).character = cell;
if (has_selection) {
auto selectionTransform = screen.GetSelectionStyle();
if ((x >= selection_start_) && (x <= selection_end_)) {
selectionTransform(screen.PixelAt(x, y));
}
}
++x;
}
}
private:
std::string text_;
bool has_selection = false;
int selection_start_ = 0;
int selection_end_ = -1;
};
class VText : public Node {
public:
explicit VText(std::string text)
: text_(std::move(text)), width_{std::min(string_width(text_), 1)} {}
void ComputeRequirement() override {
requirement_.min_x = width_;
requirement_.min_y = string_width(text_);
}
void Render(Screen& screen) override {
const int x = box_.x_min;
int y = box_.y_min;
if (x + width_ - 1 > box_.x_max) {
return;
}
for (const auto& it : Utf8ToGlyphs(text_)) {
if (y > box_.y_max) {
return;
}
screen.PixelAt(x, y).character = it;
y += 1;
}
}
private:
std::string text_;
int width_ = 1;
};
} // namespace
/// @brief Display a piece of UTF8 encoded unicode text.
/// @ingroup dom
/// @see ftxui::to_wstring
///
/// ### Example
///
/// ```cpp
/// Element document = text("Hello world!");
/// ```
///
/// ### Output
///
/// ```bash
/// Hello world!
/// ```
Element text(std::string text) {
return std::make_shared<Text>(std::move(text));
}
/// @brief Display a piece of unicode text.
/// @ingroup dom
/// @see ftxui::to_wstring
///
/// ### Example
///
/// ```cpp
/// Element document = text(L"Hello world!");
/// ```
///
/// ### Output
///
/// ```bash
/// Hello world!
/// ```
Element text(std::wstring text) { // NOLINT
return std::make_shared<Text>(to_string(text));
}
/// @brief Display a piece of unicode text vertically.
/// @ingroup dom
/// @see ftxui::to_wstring
///
/// ### Example
///
/// ```cpp
/// Element document = vtext("Hello world!");
/// ```
///
/// ### Output
///
/// ```bash
/// H
/// e
/// l
/// l
/// o
///
/// w
/// o
/// r
/// l
/// d
/// !
/// ```
Element vtext(std::string text) {
return std::make_shared<VText>(std::move(text));
}
/// @brief Display a piece unicode text vertically.
/// @ingroup dom
/// @see ftxui::to_wstring
///
/// ### Example
///
/// ```cpp
/// Element document = vtext(L"Hello world!");
/// ```
///
/// ### Output
///
/// ```bash
/// H
/// e
/// l
/// l
/// o
///
/// w
/// o
/// r
/// l
/// d
/// !
/// ```
Element vtext(std::wstring text) { // NOLINT
return std::make_shared<VText>(to_string(text));
}
} // namespace ftxui
box.hpp
ftxui::Node
Definition node.hpp:23
deprecated.hpp
elements.hpp
ftxui
Definition animation.hpp:10
ftxui::Element
std::shared_ptr< Node > Element
Definition elements.hpp:22
ftxui::Utf8ToGlyphs
std::vector< std::string > Utf8ToGlyphs(const std::string &input)
Definition string.cpp:1357
ftxui::string_width
int string_width(const std::string &)
Definition string.cpp:1330
ftxui::to_string
std::string to_string(const std::wstring &s)
Convert a UTF8 std::string into a std::wstring.
Definition string.cpp:1565
ftxui::text
Element text(std::wstring text)
Display a piece of unicode text.
Definition text.cpp:160
ftxui::vtext
Element vtext(std::wstring text)
Display a piece unicode text vertically.
Definition text.cpp:220
ftxui::Render
void Render(Screen &screen, const Element &element)
Display an element on a ftxui::Screen.
Definition node.cpp:88
node.hpp
requirement.hpp
screen.hpp
selection.hpp
string.hpp
ftxui::Box::Intersection
static auto Intersection(Box a, Box b) -> Box
Definition box.cpp:12