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screen_interactive.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 "ftxui/component/screen_interactive.hpp"
#include <algorithm> // for copy, max, min
#include <array> // for array
#include <atomic>
#include <chrono> // for operator-, milliseconds, operator>=, duration, common_type<>::type, time_point
#include <csignal> // for signal, SIGTSTP, SIGABRT, SIGWINCH, raise, SIGFPE, SIGILL, SIGINT, SIGSEGV, SIGTERM, __sighandler_t, size_t
#include <cstdint>
#include <cstdio> // for fileno, stdin
#include <ftxui/component/task.hpp> // for Task, Closure, AnimationTask
#include <ftxui/screen/screen.hpp> // for Pixel, Screen::Cursor, Screen, Screen::Cursor::Hidden
#include <functional> // for function
#include <initializer_list> // for initializer_list
#include <iostream> // for cout, ostream, operator<<, basic_ostream, endl, flush
#include <memory>
#include <stack> // for stack
#include <string>
#include <thread> // for thread, sleep_for
#include <tuple> // for _Swallow_assign, ignore
#include <type_traits> // for decay_t
#include <utility> // for move, swap
#include <variant> // for visit, variant
#include <vector> // for vector
#include "ftxui/component/animation.hpp" // for TimePoint, Clock, Duration, Params, RequestAnimationFrame
#include "ftxui/component/captured_mouse.hpp" // for CapturedMouse, CapturedMouseInterface
#include "ftxui/component/component_base.hpp" // for ComponentBase
#include "ftxui/component/event.hpp" // for Event
#include "ftxui/component/loop.hpp" // for Loop
#include "ftxui/component/receiver.hpp" // for ReceiverImpl, Sender, MakeReceiver, SenderImpl, Receiver
#include "ftxui/component/terminal_input_parser.hpp" // for TerminalInputParser
#include "ftxui/dom/node.hpp" // for Node, Render
#include "ftxui/dom/requirement.hpp" // for Requirement
#include "ftxui/screen/pixel.hpp" // for Pixel
#include "ftxui/screen/terminal.hpp" // for Dimensions, Size
#include "ftxui/screen/util.hpp" // for util::clamp
#if defined(_WIN32)
#define DEFINE_CONSOLEV2_PROPERTIES
#define WIN32_LEAN_AND_MEAN
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <windows.h>
#ifndef UNICODE
#error Must be compiled in UNICODE mode
#endif
#else
#include <sys/select.h> // for select, FD_ISSET, FD_SET, FD_ZERO, fd_set, timeval
#include <termios.h> // for tcsetattr, termios, tcgetattr, TCSANOW, cc_t, ECHO, ICANON, VMIN, VTIME
#include <unistd.h> // for STDIN_FILENO, read
#endif
// Quick exit is missing in standard CLang headers
#if defined(__clang__) && defined(__APPLE__)
#define quick_exit(a) exit(a)
#endif
namespace ftxui {
namespace animation {
void RequestAnimationFrame() {
auto* screen = ScreenInteractive::Active();
if (screen) {
screen->RequestAnimationFrame();
}
}
} // namespace animation
namespace {
ScreenInteractive* g_active_screen = nullptr; // NOLINT
void Flush() {
// Emscripten doesn't implement flush. We interpret zero as flush.
std::cout << '\0' << std::flush;
}
constexpr int timeout_milliseconds = 20;
[[maybe_unused]] constexpr int timeout_microseconds =
timeout_milliseconds * 1000;
#if defined(_WIN32)
void EventListener(std::atomic<bool>* quit, Sender<Task> out) {
auto console = GetStdHandle(STD_INPUT_HANDLE);
auto parser = TerminalInputParser(out->Clone());
while (!*quit) {
// Throttle ReadConsoleInput by waiting 250ms, this wait function will
// return if there is input in the console.
auto wait_result = WaitForSingleObject(console, timeout_milliseconds);
if (wait_result == WAIT_TIMEOUT) {
parser.Timeout(timeout_milliseconds);
continue;
}
DWORD number_of_events = 0;
if (!GetNumberOfConsoleInputEvents(console, &number_of_events))
continue;
if (number_of_events <= 0)
continue;
std::vector<INPUT_RECORD> records{number_of_events};
DWORD number_of_events_read = 0;
ReadConsoleInput(console, records.data(), (DWORD)records.size(),
&number_of_events_read);
records.resize(number_of_events_read);
for (const auto& r : records) {
switch (r.EventType) {
case KEY_EVENT: {
auto key_event = r.Event.KeyEvent;
// ignore UP key events
if (key_event.bKeyDown == FALSE)
continue;
std::wstring wstring;
wstring += key_event.uChar.UnicodeChar;
for (auto it : to_string(wstring)) {
parser.Add(it);
}
} break;
case WINDOW_BUFFER_SIZE_EVENT:
out->Send(Event::Special({0}));
break;
case MENU_EVENT:
case FOCUS_EVENT:
case MOUSE_EVENT:
// TODO(mauve): Implement later.
break;
}
}
}
}
#elif defined(__EMSCRIPTEN__)
#include <emscripten.h>
// Read char from the terminal.
void EventListener(std::atomic<bool>* quit, Sender<Task> out) {
auto parser = TerminalInputParser(std::move(out));
char c;
while (!*quit) {
while (read(STDIN_FILENO, &c, 1), c)
parser.Add(c);
emscripten_sleep(1);
parser.Timeout(1);
}
}
extern "C" {
EMSCRIPTEN_KEEPALIVE
void ftxui_on_resize(int columns, int rows) {
Terminal::SetFallbackSize({
columns,
rows,
});
std::raise(SIGWINCH);
}
}
#else // POSIX (Linux & Mac)
int CheckStdinReady(int usec_timeout) {
timeval tv = {0, usec_timeout}; // NOLINT
fd_set fds;
FD_ZERO(&fds); // NOLINT
FD_SET(STDIN_FILENO, &fds); // NOLINT
select(STDIN_FILENO + 1, &fds, nullptr, nullptr, &tv); // NOLINT
return FD_ISSET(STDIN_FILENO, &fds); // NOLINT
}
// Read char from the terminal.
void EventListener(std::atomic<bool>* quit, Sender<Task> out) {
auto parser = TerminalInputParser(std::move(out));
while (!*quit) {
if (!CheckStdinReady(timeout_microseconds)) {
parser.Timeout(timeout_milliseconds);
continue;
}
const size_t buffer_size = 100;
std::array<char, buffer_size> buffer; // NOLINT;
size_t l = read(fileno(stdin), buffer.data(), buffer_size); // NOLINT
for (size_t i = 0; i < l; ++i) {
parser.Add(buffer[i]); // NOLINT
}
}
}
#endif
std::stack<Closure> on_exit_functions; // NOLINT
void OnExit() {
while (!on_exit_functions.empty()) {
on_exit_functions.top()();
on_exit_functions.pop();
}
}
std::atomic<int> g_signal_exit_count = 0; // NOLINT
#if !defined(_WIN32)
std::atomic<int> g_signal_stop_count = 0; // NOLINT
std::atomic<int> g_signal_resize_count = 0; // NOLINT
#endif
// Async signal safe function
void RecordSignal(int signal) {
switch (signal) {
case SIGABRT:
case SIGFPE:
case SIGILL:
case SIGINT:
case SIGSEGV:
case SIGTERM:
g_signal_exit_count++;
break;
#if !defined(_WIN32)
case SIGTSTP: // NOLINT
g_signal_stop_count++;
break;
case SIGWINCH: // NOLINT
g_signal_resize_count++;
break;
#endif
default:
break;
}
}
void ExecuteSignalHandlers() {
int signal_exit_count = g_signal_exit_count.exchange(0);
while (signal_exit_count--) {
ScreenInteractive::Private::Signal(*g_active_screen, SIGABRT);
}
#if !defined(_WIN32)
int signal_stop_count = g_signal_stop_count.exchange(0);
while (signal_stop_count--) {
ScreenInteractive::Private::Signal(*g_active_screen, SIGTSTP);
}
int signal_resize_count = g_signal_resize_count.exchange(0);
while (signal_resize_count--) {
ScreenInteractive::Private::Signal(*g_active_screen, SIGWINCH);
}
#endif
}
void InstallSignalHandler(int sig) {
auto old_signal_handler = std::signal(sig, RecordSignal);
on_exit_functions.emplace(
[=] { std::ignore = std::signal(sig, old_signal_handler); });
}
// CSI: Control Sequence Introducer
const std::string CSI = "\x1b["; // NOLINT
//
// DCS: Device Control String
const std::string DCS = "\x1bP"; // NOLINT
// ST: String Terminator
const std::string ST = "\x1b\\"; // NOLINT
// DECRQSS: Request Status String
// DECSCUSR: Set Cursor Style
const std::string DECRQSS_DECSCUSR = DCS + "$q q" + ST; // NOLINT
// DEC: Digital Equipment Corporation
enum class DECMode : std::uint16_t {
kLineWrap = 7,
kCursor = 25,
kMouseX10 = 9,
kMouseVt200 = 1000,
kMouseVt200Highlight = 1001,
kMouseBtnEventMouse = 1002,
kMouseAnyEvent = 1003,
kMouseUtf8 = 1005,
kMouseSgrExtMode = 1006,
kMouseUrxvtMode = 1015,
kMouseSgrPixelsMode = 1016,
kAlternateScreen = 1049,
};
// Device Status Report (DSR) {
enum class DSRMode : std::uint8_t {
kCursor = 6,
};
std::string Serialize(const std::vector<DECMode>& parameters) {
bool first = true;
std::string out;
for (const DECMode parameter : parameters) {
if (!first) {
out += ";";
}
out += std::to_string(int(parameter));
first = false;
}
return out;
}
// DEC Private Mode Set (DECSET)
std::string Set(const std::vector<DECMode>& parameters) {
return CSI + "?" + Serialize(parameters) + "h";
}
// DEC Private Mode Reset (DECRST)
std::string Reset(const std::vector<DECMode>& parameters) {
return CSI + "?" + Serialize(parameters) + "l";
}
// Device Status Report (DSR)
std::string DeviceStatusReport(DSRMode ps) {
return CSI + std::to_string(int(ps)) + "n";
}
class CapturedMouseImpl : public CapturedMouseInterface {
public:
explicit CapturedMouseImpl(std::function<void(void)> callback)
: callback_(std::move(callback)) {}
~CapturedMouseImpl() override { callback_(); }
CapturedMouseImpl(const CapturedMouseImpl&) = delete;
CapturedMouseImpl(CapturedMouseImpl&&) = delete;
CapturedMouseImpl& operator=(const CapturedMouseImpl&) = delete;
CapturedMouseImpl& operator=(CapturedMouseImpl&&) = delete;
private:
std::function<void(void)> callback_;
};
void AnimationListener(std::atomic<bool>* quit, Sender<Task> out) {
// Animation at around 60fps.
const auto time_delta = std::chrono::milliseconds(15);
while (!*quit) {
out->Send(AnimationTask());
std::this_thread::sleep_for(time_delta);
}
}
} // namespace
ScreenInteractive::ScreenInteractive(int dimx,
int dimy,
Dimension dimension,
bool use_alternative_screen)
: Screen(dimx, dimy),
dimension_(dimension),
use_alternative_screen_(use_alternative_screen) {
task_receiver_ = MakeReceiver<Task>();
}
// static
ScreenInteractive ScreenInteractive::FixedSize(int dimx, int dimy) {
return {
dimx,
dimy,
Dimension::Fixed,
false,
};
}
/// @ingroup component
/// Create a ScreenInteractive taking the full terminal size. This is using the
/// alternate screen buffer to avoid messing with the terminal content.
/// @note This is the same as `ScreenInteractive::FullscreenAlternateScreen()`
// static
ScreenInteractive ScreenInteractive::Fullscreen() {
return FullscreenAlternateScreen();
}
/// @ingroup component
/// Create a ScreenInteractive taking the full terminal size. The primary screen
/// buffer is being used. It means if the terminal is resized, the previous
/// content might mess up with the terminal content.
// static
ScreenInteractive ScreenInteractive::FullscreenPrimaryScreen() {
return {
0,
0,
Dimension::Fullscreen,
false,
};
}
/// @ingroup component
/// Create a ScreenInteractive taking the full terminal size. This is using the
/// alternate screen buffer to avoid messing with the terminal content.
// static
ScreenInteractive ScreenInteractive::FullscreenAlternateScreen() {
return {
0,
0,
Dimension::Fullscreen,
true,
};
}
// static
ScreenInteractive ScreenInteractive::TerminalOutput() {
return {
0,
0,
Dimension::TerminalOutput,
false,
};
}
// static
ScreenInteractive ScreenInteractive::FitComponent() {
return {
0,
0,
Dimension::FitComponent,
false,
};
}
/// @ingroup component
/// @brief Set whether mouse is tracked and events reported.
/// called outside of the main loop. E.g `ScreenInteractive::Loop(...)`.
/// @param enable Whether to enable mouse event tracking.
/// @note This muse be called outside of the main loop. E.g. before calling
/// `ScreenInteractive::Loop`.
/// @note Mouse tracking is enabled by default.
/// @note Mouse tracking is only supported on terminals that supports it.
///
/// ### Example
///
/// ```cpp
/// auto screen = ScreenInteractive::TerminalOutput();
/// screen.TrackMouse(false);
/// screen.Loop(component);
/// ```
void ScreenInteractive::TrackMouse(bool enable) {
track_mouse_ = enable;
}
/// @brief Add a task to the main loop.
/// It will be executed later, after every other scheduled tasks.
/// @ingroup component
void ScreenInteractive::Post(Task task) {
// Task/Events sent toward inactive screen or screen waiting to become
// inactive are dropped.
if (!task_sender_) {
return;
}
task_sender_->Send(std::move(task));
}
/// @brief Add an event to the main loop.
/// It will be executed later, after every other scheduled events.
/// @ingroup component
void ScreenInteractive::PostEvent(Event event) {
Post(event);
}
/// @brief Add a task to draw the screen one more time, until all the animations
/// are done.
void ScreenInteractive::RequestAnimationFrame() {
if (animation_requested_) {
return;
}
animation_requested_ = true;
auto now = animation::Clock::now();
const auto time_histeresis = std::chrono::milliseconds(33);
if (now - previous_animation_time_ >= time_histeresis) {
previous_animation_time_ = now;
}
}
/// @brief Try to get the unique lock about behing able to capture the mouse.
/// @return A unique lock if the mouse is not already captured, otherwise a
/// null.
/// @ingroup component
CapturedMouse ScreenInteractive::CaptureMouse() {
if (mouse_captured) {
return nullptr;
}
mouse_captured = true;
return std::make_unique<CapturedMouseImpl>(
[this] { mouse_captured = false; });
}
/// @brief Execute the main loop.
/// @param component The component to draw.
/// @ingroup component
void ScreenInteractive::Loop(Component component) { // NOLINT
class Loop loop(this, std::move(component));
loop.Run();
}
/// @brief Return whether the main loop has been quit.
/// @ingroup component
bool ScreenInteractive::HasQuitted() {
return task_receiver_->HasQuitted();
}
// private
void ScreenInteractive::PreMain() {
// Suspend previously active screen:
if (g_active_screen) {
std::swap(suspended_screen_, g_active_screen);
// Reset cursor position to the top of the screen and clear the screen.
suspended_screen_->ResetCursorPosition();
std::cout << suspended_screen_->ResetPosition(/*clear=*/true);
suspended_screen_->dimx_ = 0;
suspended_screen_->dimy_ = 0;
// Reset dimensions to force drawing the screen again next time:
suspended_screen_->Uninstall();
}
// This screen is now active:
g_active_screen = this;
g_active_screen->Install();
previous_animation_time_ = animation::Clock::now();
}
// private
void ScreenInteractive::PostMain() {
// Put cursor position at the end of the drawing.
ResetCursorPosition();
g_active_screen = nullptr;
// Restore suspended screen.
if (suspended_screen_) {
// Clear screen, and put the cursor at the beginning of the drawing.
std::cout << ResetPosition(/*clear=*/true);
dimx_ = 0;
dimy_ = 0;
Uninstall();
std::swap(g_active_screen, suspended_screen_);
g_active_screen->Install();
} else {
Uninstall();
std::cout << '\r';
// On final exit, keep the current drawing and reset cursor position one
// line after it.
if (!use_alternative_screen_) {
std::cout << '\n';
std::cout << std::flush;
}
}
}
/// @brief Decorate a function. It executes the same way, but with the currently
/// active screen terminal hooks temporarilly uninstalled during its execution.
/// @param fn The function to decorate.
Closure ScreenInteractive::WithRestoredIO(Closure fn) { // NOLINT
return [this, fn] {
Uninstall();
fn();
Install();
};
}
/// @brief Force FTXUI to handle or not handle Ctrl-C, even if the component
/// catches the Event::CtrlC.
void ScreenInteractive::ForceHandleCtrlC(bool force) {
force_handle_ctrl_c_ = force;
}
/// @brief Force FTXUI to handle or not handle Ctrl-Z, even if the component
/// catches the Event::CtrlZ.
void ScreenInteractive::ForceHandleCtrlZ(bool force) {
force_handle_ctrl_z_ = force;
}
/// @brief Returns the content of the current selection
std::string ScreenInteractive::GetSelection() {
if (!selection_) {
return "";
}
return selection_->GetParts();
}
void ScreenInteractive::SelectionChange(std::function<void()> callback) {
selection_on_change_ = std::move(callback);
}
/// @brief Return the currently active screen, or null if none.
// static
ScreenInteractive* ScreenInteractive::Active() {
return g_active_screen;
}
// private
void ScreenInteractive::Install() {
frame_valid_ = false;
// Flush the buffer for stdout to ensure whatever the user has printed before
// is fully applied before we start modifying the terminal configuration. This
// is important, because we are using two different channels (stdout vs
// termios/WinAPI) to communicate with the terminal emulator below. See
// https://github.com/ArthurSonzogni/FTXUI/issues/846
Flush();
// After uninstalling the new configuration, flush it to the terminal to
// ensure it is fully applied:
on_exit_functions.emplace([] { Flush(); });
on_exit_functions.emplace([this] { ExitLoopClosure()(); });
// Request the terminal to report the current cursor shape. We will restore it
// on exit.
std::cout << DECRQSS_DECSCUSR;
on_exit_functions.emplace([this] {
std::cout << "\033[?25h"; // Enable cursor.
std::cout << "\033[" + std::to_string(cursor_reset_shape_) + " q";
});
// Install signal handlers to restore the terminal state on exit. The default
// signal handlers are restored on exit.
for (const int signal : {SIGTERM, SIGSEGV, SIGINT, SIGILL, SIGABRT, SIGFPE}) {
InstallSignalHandler(signal);
}
// Save the old terminal configuration and restore it on exit.
#if defined(_WIN32)
// Enable VT processing on stdout and stdin
auto stdout_handle = GetStdHandle(STD_OUTPUT_HANDLE);
auto stdin_handle = GetStdHandle(STD_INPUT_HANDLE);
DWORD out_mode = 0;
DWORD in_mode = 0;
GetConsoleMode(stdout_handle, &out_mode);
GetConsoleMode(stdin_handle, &in_mode);
on_exit_functions.push([=] { SetConsoleMode(stdout_handle, out_mode); });
on_exit_functions.push([=] { SetConsoleMode(stdin_handle, in_mode); });
// https://docs.microsoft.com/en-us/windows/console/setconsolemode
const int enable_virtual_terminal_processing = 0x0004;
const int disable_newline_auto_return = 0x0008;
out_mode |= enable_virtual_terminal_processing;
out_mode |= disable_newline_auto_return;
// https://docs.microsoft.com/en-us/windows/console/setconsolemode
const int enable_line_input = 0x0002;
const int enable_echo_input = 0x0004;
const int enable_virtual_terminal_input = 0x0200;
const int enable_window_input = 0x0008;
in_mode &= ~enable_echo_input;
in_mode &= ~enable_line_input;
in_mode |= enable_virtual_terminal_input;
in_mode |= enable_window_input;
SetConsoleMode(stdin_handle, in_mode);
SetConsoleMode(stdout_handle, out_mode);
#else
for (const int signal : {SIGWINCH, SIGTSTP}) {
InstallSignalHandler(signal);
}
struct termios terminal; // NOLINT
tcgetattr(STDIN_FILENO, &terminal);
on_exit_functions.emplace(
[=] { tcsetattr(STDIN_FILENO, TCSANOW, &terminal); });
// Enabling raw terminal input mode
terminal.c_iflag &= ~IGNBRK; // Disable ignoring break condition
terminal.c_iflag &= ~BRKINT; // Disable break causing input and output to be
// flushed
terminal.c_iflag &= ~PARMRK; // Disable marking parity errors.
terminal.c_iflag &= ~ISTRIP; // Disable striping 8th bit off characters.
terminal.c_iflag &= ~INLCR; // Disable mapping NL to CR.
terminal.c_iflag &= ~IGNCR; // Disable ignoring CR.
terminal.c_iflag &= ~ICRNL; // Disable mapping CR to NL.
terminal.c_iflag &= ~IXON; // Disable XON/XOFF flow control on output
terminal.c_lflag &= ~ECHO; // Disable echoing input characters.
terminal.c_lflag &= ~ECHONL; // Disable echoing new line characters.
terminal.c_lflag &= ~ICANON; // Disable Canonical mode.
terminal.c_lflag &= ~ISIG; // Disable sending signal when hitting:
// - => DSUSP
// - C-Z => SUSP
// - C-C => INTR
// - C-d => QUIT
terminal.c_lflag &= ~IEXTEN; // Disable extended input processing
terminal.c_cflag |= CS8; // 8 bits per byte
terminal.c_cc[VMIN] = 0; // Minimum number of characters for non-canonical
// read.
terminal.c_cc[VTIME] = 0; // Timeout in deciseconds for non-canonical read.
tcsetattr(STDIN_FILENO, TCSANOW, &terminal);
#endif
auto enable = [&](const std::vector<DECMode>& parameters) {
std::cout << Set(parameters);
on_exit_functions.emplace([=] { std::cout << Reset(parameters); });
};
auto disable = [&](const std::vector<DECMode>& parameters) {
std::cout << Reset(parameters);
on_exit_functions.emplace([=] { std::cout << Set(parameters); });
};
if (use_alternative_screen_) {
enable({
DECMode::kAlternateScreen,
});
}
disable({
// DECMode::kCursor,
DECMode::kLineWrap,
});
if (track_mouse_) {
enable({DECMode::kMouseVt200});
enable({DECMode::kMouseAnyEvent});
enable({DECMode::kMouseUrxvtMode});
enable({DECMode::kMouseSgrExtMode});
}
// After installing the new configuration, flush it to the terminal to
// ensure it is fully applied:
Flush();
quit_ = false;
task_sender_ = task_receiver_->MakeSender();
event_listener_ =
std::thread(&EventListener, &quit_, task_receiver_->MakeSender());
animation_listener_ =
std::thread(&AnimationListener, &quit_, task_receiver_->MakeSender());
}
// private
void ScreenInteractive::Uninstall() {
ExitNow();
event_listener_.join();
animation_listener_.join();
OnExit();
}
// private
// NOLINTNEXTLINE
void ScreenInteractive::RunOnceBlocking(Component component) {
ExecuteSignalHandlers();
Task task;
if (task_receiver_->Receive(&task)) {
HandleTask(component, task);
}
RunOnce(component);
}
// private
void ScreenInteractive::RunOnce(Component component) {
Task task;
while (task_receiver_->ReceiveNonBlocking(&task)) {
HandleTask(component, task);
ExecuteSignalHandlers();
}
Draw(std::move(component));
if (selection_data_previous_ != selection_data_) {
selection_data_previous_ = selection_data_;
if (selection_on_change_) {
selection_on_change_();
Post(Event::Custom);
}
}
}
// private
// NOLINTNEXTLINE
void ScreenInteractive::HandleTask(Component component, Task& task) {
std::visit(
[&](auto&& arg) {
using T = std::decay_t<decltype(arg)>;
// clang-format off
// Handle Event.
if constexpr (std::is_same_v<T, Event>) {
if (arg.is_cursor_position()) {
cursor_x_ = arg.cursor_x();
cursor_y_ = arg.cursor_y();
return;
}
if (arg.is_cursor_shape()) {
cursor_reset_shape_= arg.cursor_shape();
return;
}
if (arg.is_mouse()) {
arg.mouse().x -= cursor_x_;
arg.mouse().y -= cursor_y_;
}
arg.screen_ = this;
bool handled = component->OnEvent(arg);
handled = HandleSelection(handled, arg);
if (arg == Event::CtrlC && (!handled || force_handle_ctrl_c_)) {
RecordSignal(SIGABRT);
}
#if !defined(_WIN32)
if (arg == Event::CtrlZ && (!handled || force_handle_ctrl_z_)) {
RecordSignal(SIGTSTP);
}
#endif
frame_valid_ = false;
return;
}
// Handle callback
if constexpr (std::is_same_v<T, Closure>) {
arg();
return;
}
// Handle Animation
if constexpr (std::is_same_v<T, AnimationTask>) {
if (!animation_requested_) {
return;
}
animation_requested_ = false;
const animation::TimePoint now = animation::Clock::now();
const animation::Duration delta = now - previous_animation_time_;
previous_animation_time_ = now;
animation::Params params(delta);
component->OnAnimation(params);
frame_valid_ = false;
return;
}
},
task);
// clang-format on
}
// private
bool ScreenInteractive::HandleSelection(bool handled, Event event) {
if (handled) {
selection_pending_ = nullptr;
selection_data_.empty = true;
selection_ = nullptr;
return true;
}
if (!event.is_mouse()) {
return false;
}
auto& mouse = event.mouse();
if (mouse.button != Mouse::Left) {
return false;
}
if (mouse.motion == Mouse::Pressed) {
selection_pending_ = CaptureMouse();
selection_data_.start_x = mouse.x;
selection_data_.start_y = mouse.y;
selection_data_.end_x = mouse.x;
selection_data_.end_y = mouse.y;
return false;
}
if (!selection_pending_) {
return false;
}
if (mouse.motion == Mouse::Moved) {
if ((mouse.x != selection_data_.end_x) ||
(mouse.y != selection_data_.end_y)) {
selection_data_.end_x = mouse.x;
selection_data_.end_y = mouse.y;
selection_data_.empty = false;
}
return true;
}
if (mouse.motion == Mouse::Released) {
selection_pending_ = nullptr;
selection_data_.end_x = mouse.x;
selection_data_.end_y = mouse.y;
selection_data_.empty = false;
return true;
}
return false;
}
// private
// NOLINTNEXTLINE
void ScreenInteractive::Draw(Component component) {
if (frame_valid_) {
return;
}
auto document = component->Render();
int dimx = 0;
int dimy = 0;
auto terminal = Terminal::Size();
document->ComputeRequirement();
switch (dimension_) {
case Dimension::Fixed:
dimx = dimx_;
dimy = dimy_;
break;
case Dimension::TerminalOutput:
dimx = terminal.dimx;
dimy = util::clamp(document->requirement().min_y, 0, terminal.dimy);
break;
case Dimension::Fullscreen:
dimx = terminal.dimx;
dimy = terminal.dimy;
break;
case Dimension::FitComponent:
dimx = util::clamp(document->requirement().min_x, 0, terminal.dimx);
dimy = util::clamp(document->requirement().min_y, 0, terminal.dimy);
break;
}
const bool resized = (dimx != dimx_) || (dimy != dimy_);
ResetCursorPosition();
std::cout << ResetPosition(/*clear=*/ resized);
// If the terminal width decrease, the terminal emulator will start wrapping
// lines and make the display dirty. We should clear it completely.
if ((dimx < dimx_) && !use_alternative_screen_) {
std::cout << "\033[J"; // clear terminal output
std::cout << "\033[H"; // move cursor to home position
}
// Resize the screen if needed.
if (resized) {
dimx_ = dimx;
dimy_ = dimy;
pixels_ = std::vector<std::vector<Pixel>>(dimy, std::vector<Pixel>(dimx));
cursor_.x = dimx_ - 1;
cursor_.y = dimy_ - 1;
}
// Periodically request the terminal emulator the frame position relative to
// the screen. This is useful for converting mouse position reported in
// screen's coordinates to frame's coordinates.
#if defined(FTXUI_MICROSOFT_TERMINAL_FALLBACK)
// Microsoft's terminal suffers from a [bug]. When reporting the cursor
// position, several output sequences are mixed together into garbage.
// This causes FTXUI user to see some "1;1;R" sequences into the Input
// component. See [issue]. Solution is to request cursor position less
// often. [bug]: https://github.com/microsoft/terminal/pull/7583 [issue]:
// https://github.com/ArthurSonzogni/FTXUI/issues/136
static int i = -3;
++i;
if (!use_alternative_screen_ && (i % 150 == 0)) { // NOLINT
std::cout << DeviceStatusReport(DSRMode::kCursor);
}
#else
static int i = -3;
++i;
if (!use_alternative_screen_ &&
(previous_frame_resized_ || i % 40 == 0)) { // NOLINT
std::cout << DeviceStatusReport(DSRMode::kCursor);
}
#endif
previous_frame_resized_ = resized;
selection_ = selection_data_.empty
? std::make_unique<Selection>()
: std::make_unique<Selection>(
selection_data_.start_x, selection_data_.start_y, //
selection_data_.end_x, selection_data_.end_y);
Render(*this, document.get(), *selection_);
// Set cursor position for user using tools to insert CJK characters.
{
const int dx = dimx_ - 1 - cursor_.x + int(dimx_ != terminal.dimx);
const int dy = dimy_ - 1 - cursor_.y;
set_cursor_position.clear();
reset_cursor_position.clear();
if (dy != 0) {
set_cursor_position += "\x1B[" + std::to_string(dy) + "A";
reset_cursor_position += "\x1B[" + std::to_string(dy) + "B";
}
if (dx != 0) {
set_cursor_position += "\x1B[" + std::to_string(dx) + "D";
reset_cursor_position += "\x1B[" + std::to_string(dx) + "C";
}
if (cursor_.shape == Cursor::Hidden) {
set_cursor_position += "\033[?25l";
} else {
set_cursor_position += "\033[?25h";
set_cursor_position +=
"\033[" + std::to_string(int(cursor_.shape)) + " q";
}
}
std::cout << ToString() << set_cursor_position;
Flush();
Clear();
frame_valid_ = true;
}
// private
void ScreenInteractive::ResetCursorPosition() {
std::cout << reset_cursor_position;
reset_cursor_position = "";
}
/// @brief Return a function to exit the main loop.
/// @ingroup component
Closure ScreenInteractive::ExitLoopClosure() {
return [this] { Exit(); };
}
/// @brief Exit the main loop.
/// @ingroup component
void ScreenInteractive::Exit() {
Post([this] { ExitNow(); });
}
// private:
void ScreenInteractive::ExitNow() {
quit_ = true;
task_sender_.reset();
}
// private:
void ScreenInteractive::Signal(int signal) {
if (signal == SIGABRT) {
Exit();
return;
}
// Windows do no support SIGTSTP / SIGWINCH
#if !defined(_WIN32)
if (signal == SIGTSTP) {
Post([&] {
ResetCursorPosition();
std::cout << ResetPosition(/*clear*/ true); // Cursor to the beginning
Uninstall();
dimx_ = 0;
dimy_ = 0;
Flush();
std::ignore = std::raise(SIGTSTP);
Install();
});
return;
}
if (signal == SIGWINCH) {
Post(Event::Special({0}));
return;
}
#endif
}
bool ScreenInteractive::SelectionData::operator==(
const ScreenInteractive::SelectionData& other) const {
if (empty && other.empty) {
return true;
}
if (empty || other.empty) {
return false;
}
return start_x == other.start_x && start_y == other.start_y &&
end_x == other.end_x && end_y == other.end_y;
}
bool ScreenInteractive::SelectionData::operator!=(
const ScreenInteractive::SelectionData& other) const {
return !(*this == other);
}
} // namespace ftxui.
animation.hpp
captured_mouse.hpp
ftxui::Image::dimy
int dimy() const
Definition image.hpp:33
ftxui::Image::dimx_
int dimx_
Definition image.hpp:41
ftxui::Image::dimy_
int dimy_
Definition image.hpp:42
ftxui::Image::dimx
int dimx() const
Definition image.hpp:32
ftxui::Image::pixels_
std::vector< std::vector< Pixel > > pixels_
Definition image.hpp:43
ftxui::Loop
Definition loop.hpp:17
ftxui::Loop::HasQuitted
bool HasQuitted()
Whether the loop has quitted.
Definition loop.cpp:32
ftxui::ScreenInteractive::Private::Signal
static void Signal(ScreenInteractive &s, int signal)
Definition screen_interactive.hpp:160
ftxui::ScreenInteractive
Definition screen_interactive.hpp:30
ftxui::ScreenInteractive::TerminalOutput
static ScreenInteractive TerminalOutput()
Definition screen_interactive.cpp:406
ftxui::ScreenInteractive::Exit
void Exit()
Exit the main loop.
Definition screen_interactive.cpp:1032
ftxui::ScreenInteractive::FixedSize
static ScreenInteractive FixedSize(int dimx, int dimy)
Definition screen_interactive.cpp:360
ftxui::ScreenInteractive::PostEvent
void PostEvent(Event event)
Add an event to the main loop. It will be executed later, after every other scheduled events.
Definition screen_interactive.cpp:461
ftxui::ScreenInteractive::Post
void Post(Task task)
Add a task to the main loop. It will be executed later, after every other scheduled tasks.
Definition screen_interactive.cpp:448
ftxui::ScreenInteractive::FitComponent
static ScreenInteractive FitComponent()
Definition screen_interactive.cpp:416
ftxui::ScreenInteractive::Fullscreen
static ScreenInteractive Fullscreen()
Definition screen_interactive.cpp:374
ftxui::ScreenInteractive::FullscreenPrimaryScreen
static ScreenInteractive FullscreenPrimaryScreen()
Definition screen_interactive.cpp:383
ftxui::ScreenInteractive::Loop
friend class Loop
Definition screen_interactive.hpp:155
ftxui::ScreenInteractive::Active
static ScreenInteractive * Active()
Return the currently active screen, or null if none.
Definition screen_interactive.cpp:594
ftxui::ScreenInteractive::CaptureMouse
CapturedMouse CaptureMouse()
Try to get the unique lock about behing able to capture the mouse.
Definition screen_interactive.cpp:483
ftxui::ScreenInteractive::GetSelection
std::string GetSelection()
Returns the content of the current selection.
Definition screen_interactive.cpp:581
ftxui::ScreenInteractive::FullscreenAlternateScreen
static ScreenInteractive FullscreenAlternateScreen()
Definition screen_interactive.cpp:396
ftxui::ScreenInteractive::TrackMouse
void TrackMouse(bool enable=true)
Set whether mouse is tracked and events reported. called outside of the main loop....
Definition screen_interactive.cpp:441
ftxui::ScreenInteractive::SelectionChange
void SelectionChange(std::function< void()> callback)
Definition screen_interactive.cpp:588
ftxui::ScreenInteractive::RequestAnimationFrame
void RequestAnimationFrame()
Add a task to draw the screen one more time, until all the animations are done.
Definition screen_interactive.cpp:467
ftxui::ScreenInteractive::ExitLoopClosure
Closure ExitLoopClosure()
Return a function to exit the main loop.
Definition screen_interactive.cpp:1026
ftxui::ScreenInteractive::ForceHandleCtrlC
void ForceHandleCtrlC(bool force)
Force FTXUI to handle or not handle Ctrl-C, even if the component catches the Event::CtrlC.
Definition screen_interactive.cpp:570
ftxui::ScreenInteractive::ForceHandleCtrlZ
void ForceHandleCtrlZ(bool force)
Force FTXUI to handle or not handle Ctrl-Z, even if the component catches the Event::CtrlZ.
Definition screen_interactive.cpp:576
ftxui::ScreenInteractive::WithRestoredIO
Closure WithRestoredIO(Closure)
Decorate a function. It executes the same way, but with the currently active screen terminal hooks te...
Definition screen_interactive.cpp:560
ftxui::Screen::ToString
std::string ToString() const
Definition screen.cpp:415
ftxui::Screen::ResetPosition
std::string ResetPosition(bool clear=false) const
Return a string to be printed in order to reset the cursor position to the beginning of the screen.
Definition screen.cpp:475
ftxui::Screen::cursor_
Cursor cursor_
Definition screen.hpp:77
ftxui::Screen::Clear
void Clear()
Clear all the pixel from the screen.
Definition screen.cpp:494
component_base.hpp
event.hpp
loop.hpp
ftxui::Terminal::SetFallbackSize
void SetFallbackSize(const Dimensions &fallbackSize)
Override terminal size in case auto-detection fails.
Definition terminal.cpp:124
ftxui::Terminal::Size
Dimensions Size()
Get the terminal size.
Definition terminal.cpp:94
ftxui::animation::Duration
std::chrono::duration< float > Duration
Definition animation.hpp:20
ftxui::animation::TimePoint
std::chrono::time_point< Clock > TimePoint
Definition animation.hpp:19
ftxui::animation::RequestAnimationFrame
void RequestAnimationFrame()
Definition screen_interactive.cpp:63
ftxui::util::clamp
constexpr const T & clamp(const T &v, const T &lo, const T &hi)
Definition util.hpp:11
ftxui
Definition animation.hpp:10
ftxui::CapturedMouse
std::unique_ptr< CapturedMouseInterface > CapturedMouse
Definition captured_mouse.hpp:19
ftxui::Make
std::shared_ptr< T > Make(Args &&... args)
Definition component.hpp:26
ftxui::Component
std::shared_ptr< ComponentBase > Component
Definition component_base.hpp:24
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::select
Element select(Element e)
Set the child to be the one focused among its siblings.
Definition frame.cpp:108
ftxui::Task
std::variant< Event, Closure, AnimationTask > Task
Definition task.hpp:14
ftxui::Render
void Render(Screen &screen, const Element &element)
Display an element on a ftxui::Screen.
Definition node.cpp:88
ftxui::Closure
std::function< void()> Closure
Definition task.hpp:13
node.hpp
pixel.hpp
receiver.hpp
requirement.hpp
screen.hpp
screen_interactive.hpp
ftxui::Event
Represent an event. It can be key press event, a terminal resize, or more ...
Definition event.hpp:27
ftxui::Event::CtrlC
static const Event CtrlC
Definition event.hpp:69
ftxui::Event::CtrlZ
static const Event CtrlZ
Definition event.hpp:92
ftxui::Event::Custom
static const Event Custom
Definition event.hpp:95
ftxui::Event::Special
static Event Special(std::string)
An custom event whose meaning is defined by the user of the library.
Definition event.cpp:79
ftxui::Mouse::Left
@ Left
Definition mouse.hpp:13
ftxui::Mouse::Pressed
@ Pressed
Definition mouse.hpp:25
ftxui::Mouse::Moved
@ Moved
Definition mouse.hpp:26
ftxui::Mouse::Released
@ Released
Definition mouse.hpp:24
ftxui::Screen::Cursor::y
int y
Definition screen.hpp:50
ftxui::Screen::Cursor::x
int x
Definition screen.hpp:49
ftxui::Screen::Cursor::shape
Shape shape
Definition screen.hpp:61
task.hpp
terminal.hpp
terminal_input_parser.hpp
util.hpp