Can't Scroll

[pat-RR-ick]

When I use a RadioButton, Menu, or Button, I can get a container that is vscrollable.

But when I have other elements I cannot. For example, the official homescreen.cpp example has vScroll but from I can tell even it does not work. Help!

Here is the sample homescreen.cpp from the git repo

https://github.com/ArthurSonzogni/FTXUI/blob/main/examples/component/homescreen.cpp

// 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 <stddef.h> // for size_t
#include // for array
#include // for atomic
#include // for operator""s, chrono_literals
#include // for sin
#include // for ref, reference_wrapper, function
#include // for allocator, shared_ptr, __shared_ptr_access
#include // for string, basic_string, char_traits, operator+, to_string
#include // for sleep_for, thread
#include // for move
#include // for vector

#include "../dom/color_info_sorted_2d.ipp" // for ColorInfoSorted2D
#include "ftxui/component/component.hpp" // for Checkbox, Renderer, Horizontal, Vertical, Input, Menu, Radiobox, ResizableSplitLeft, Tab
#include "ftxui/component/component_base.hpp" // for ComponentBase, Component
#include "ftxui/component/component_options.hpp" // for MenuOption, InputOption
#include "ftxui/component/event.hpp" // for Event, Event::Custom
#include "ftxui/component/screen_interactive.hpp" // for Component, ScreenInteractive
#include "ftxui/dom/elements.hpp" // for text, color, operator|, bgcolor, filler, Element, vbox, size, hbox, separator, flex, window, graph, EQUAL, paragraph, WIDTH, hcenter, Elements, bold, vscroll_indicator, HEIGHT, flexbox, hflow, border, frame, flex_grow, gauge, paragraphAlignCenter, paragraphAlignJustify, paragraphAlignLeft, paragraphAlignRight, dim, spinner, LESS_THAN, center, yframe, GREATER_THAN
#include "ftxui/dom/flexbox_config.hpp" // for FlexboxConfig
#include "ftxui/screen/color.hpp" // for Color, Color::BlueLight, Color::RedLight, Color::Black, Color::Blue, Color::Cyan, Color::CyanLight, Color::GrayDark, Color::GrayLight, Color::Green, Color::GreenLight, Color::Magenta, Color::MagentaLight, Color::Red, Color::White, Color::Yellow, Color::YellowLight, Color::Default, Color::Palette256, ftxui
#include "ftxui/screen/color_info.hpp" // for ColorInfo
#include "ftxui/screen/terminal.hpp" // for Size, Dimensions

using namespace ftxui;

int main() {
auto screen = ScreenInteractive::Fullscreen();

// ---------------------------------------------------------------------------
// HTOP
// ---------------------------------------------------------------------------
int shift = 0;

auto my_graph = [&shift](int width, int height) {
std::vector output(width);
for (int i = 0; i < width; ++i) {
float v = 0.5f;
v += 0.1f * sin((i + shift) * 0.1f);
v += 0.2f * sin((i + shift + 10) * 0.15f);
v += 0.1f * sin((i + shift) * 0.03f);
v *= height;
output[i] = (int)v;
}
return output;
};

auto htop = Renderer([&] {
auto frequency = vbox({
text("Frequency [Mhz]") | hcenter,
hbox({
vbox({
text("2400 "),
filler(),
text("1200 "),
filler(),
text("0 "),
}),
graph(std::ref(my_graph)) | flex,
}) | flex,
});

auto utilization = vbox({
    text("Utilization [%]") | hcenter,
    hbox({
        vbox({
            text("100 "),
            filler(),
            text("50 "),
            filler(),
            text("0 "),
        }),
        graph(std::ref(my_graph)) | color(Color::RedLight),
    }) | flex,
});

auto ram = vbox({
    text("Ram [Mo]") | hcenter,
    hbox({
        vbox({
            text("8192"),
            filler(),
            text("4096 "),
            filler(),
            text("0 "),
        }),
        graph(std::ref(my_graph)) | color(Color::BlueLight),
    }) | flex,
});

return hbox({
           vbox({
               frequency | flex,
               separator(),
               utilization | flex,
           }) | flex,
           separator(),
           ram | flex,
       }) |
       flex;

});

// ---------------------------------------------------------------------------
// Compiler
// ---------------------------------------------------------------------------

const std::vectorstd::string compiler_entries = {
"gcc",
"clang",
"emcc",
"game_maker",
"Ada compilers",
"ALGOL 60 compilers",
"ALGOL 68 compilers",
"Assemblers (Intel 86)",
"Assemblers (Motorola 68)",
"Assemblers (Zilog Z80)",
"Assemblers (other)",
"BASIC Compilers",
"BASIC interpreters",
"Batch compilers",
"C compilers",
"Source-to-source compilers",
"C++ compilers",
"C# compilers",
"COBOL compilers",
"Common Lisp compilers",
"D compilers",
"DIBOL/DBL compilers",
"ECMAScript interpreters",
"Eiffel compilers",
"Fortran compilers",
"Go compilers",
"Haskell compilers",
"Java compilers",
"Pascal compilers",
"Perl Interpreters",
"PHP compilers",
"PL/I compilers",
"Python compilers",
"Scheme compilers and interpreters",
"Smalltalk compilers",
"Tcl Interpreters",
"VMS Interpreters",
"Rexx Interpreters",
"CLI compilers",
};

int compiler_selected = 0;
Component compiler = Radiobox(&compiler_entries, &compiler_selected);

std::array<std::string, 8> options_label = {
"-Wall",
"-Werror",
"-lpthread",
"-O3",
"-Wabi-tag",
"-Wno-class-conversion",
"-Wcomma-subscript",
"-Wno-conversion-null",
};
std::array<bool, 8> options_state = {
false, false, false, false, false, false, false, false,
};

std::vectorstd::string input_entries;
int input_selected = 0;
Component input = Menu(&input_entries, &input_selected);

auto input_option = InputOption();
std::string input_add_content;
input_option.on_enter = [&] {
input_entries.push_back(input_add_content);
input_add_content = "";
};
Component input_add = Input(&input_add_content, "input files", input_option);

std::string executable_content_ = "";
Component executable_ = Input(&executable_content_, "executable");

Component flags = Container::Vertical({
Checkbox(&options_label[0], &options_state[0]),
Checkbox(&options_label[1], &options_state[1]),
Checkbox(&options_label[2], &options_state[2]),
Checkbox(&options_label[3], &options_state[3]),
Checkbox(&options_label[4], &options_state[4]),
Checkbox(&options_label[5], &options_state[5]),
Checkbox(&options_label[6], &options_state[6]),
Checkbox(&options_label[7], &options_state[7]),
});

auto compiler_component = Container::Horizontal({
compiler,
flags,
Container::Vertical({
executable_,
Container::Horizontal({
input_add,
input,
}),
}),
});

auto render_command = [&] {
Elements line;
// Compiler
line.push_back(text(compiler_entries[compiler_selected]) | bold);
// flags
for (int i = 0; i < 8; ++i) {
if (options_state[i]) {
line.push_back(text(" "));
line.push_back(text(options_label[i]) | dim);
}
}
// Executable
if (!executable_content_.empty()) {
line.push_back(text(" -o ") | bold);
line.push_back(text(executable_content_) | color(Color::BlueLight) |
bold);
}
// Input
for (auto& it : input_entries) {
line.push_back(text(" " + it) | color(Color::RedLight));
}
return line;
};

auto compiler_renderer = Renderer(compiler_component, [&] {
auto compiler_win = window(text("Compiler"),
compiler->Render() | vscroll_indicator | frame);
auto flags_win =
window(text("Flags"), flags->Render() | vscroll_indicator | frame);
auto executable_win = window(text("Executable:"), executable_->Render());
auto input_win =
window(text("Input"), hbox({
vbox({
hbox({
text("Add: "),
input_add->Render(),
}) | size(WIDTH, EQUAL, 20) |
size(HEIGHT, EQUAL, 1),
filler(),
}),
separator(),
input->Render() | vscroll_indicator | frame |
size(HEIGHT, EQUAL, 3) | flex,
}));
return vbox({
hbox({
compiler_win,
flags_win,
vbox({
executable_win | size(WIDTH, EQUAL, 20),
input_win | size(WIDTH, EQUAL, 60),
}),
filler(),
}) | size(HEIGHT, LESS_THAN, 8),
hflow(render_command()) | flex_grow,
}) |
flex_grow;
});

// ---------------------------------------------------------------------------
// Spinner
// ---------------------------------------------------------------------------
auto spinner_tab_renderer = Renderer([&] {
Elements entries;
for (int i = 0; i < 22; ++i) {
entries.push_back(spinner(i, shift / 2) | bold |
size(WIDTH, GREATER_THAN, 2) | border);
}
return hflow(std::move(entries));
});

// ---------------------------------------------------------------------------
// Colors
// ---------------------------------------------------------------------------
auto color_tab_renderer = Renderer([] {
auto basic_color_display =
vbox({
text("16 color palette:"),
separator(),
hbox({
vbox({
color(Color::Default, text("Default")),
color(Color::Black, text("Black")),
color(Color::GrayDark, text("GrayDark")),
color(Color::GrayLight, text("GrayLight")),
color(Color::White, text("White")),
color(Color::Blue, text("Blue")),
color(Color::BlueLight, text("BlueLight")),
color(Color::Cyan, text("Cyan")),
color(Color::CyanLight, text("CyanLight")),
color(Color::Green, text("Green")),
color(Color::GreenLight, text("GreenLight")),
color(Color::Magenta, text("Magenta")),
color(Color::MagentaLight, text("MagentaLight")),
color(Color::Red, text("Red")),
color(Color::RedLight, text("RedLight")),
color(Color::Yellow, text("Yellow")),
color(Color::YellowLight, text("YellowLight")),
}),
vbox({
bgcolor(Color::Default, text("Default")),
bgcolor(Color::Black, text("Black")),
bgcolor(Color::GrayDark, text("GrayDark")),
bgcolor(Color::GrayLight, text("GrayLight")),
bgcolor(Color::White, text("White")),
bgcolor(Color::Blue, text("Blue")),
bgcolor(Color::BlueLight, text("BlueLight")),
bgcolor(Color::Cyan, text("Cyan")),
bgcolor(Color::CyanLight, text("CyanLight")),
bgcolor(Color::Green, text("Green")),
bgcolor(Color::GreenLight, text("GreenLight")),
bgcolor(Color::Magenta, text("Magenta")),
bgcolor(Color::MagentaLight, text("MagentaLight")),
bgcolor(Color::Red, text("Red")),
bgcolor(Color::RedLight, text("RedLight")),
bgcolor(Color::Yellow, text("Yellow")),
bgcolor(Color::YellowLight, text("YellowLight")),
}),
}),
}) |
border;

auto palette_256_color_display = text("256 colors palette:");
{
  std::vector<std::vector<ColorInfo>> info_columns = ColorInfoSorted2D();
  Elements columns;
  for (auto& column : info_columns) {
    Elements column_elements;
    for (auto& it : column) {
      column_elements.push_back(
          text("   ") | bgcolor(Color(Color::Palette256(it.index_256))));
    }
    columns.push_back(hbox(std::move(column_elements)));
  }
  palette_256_color_display = vbox({
                                  palette_256_color_display,
                                  separator(),
                                  vbox(columns),
                              }) |
                              border;
}

// True color display.
auto true_color_display = text("TrueColors: 24bits:");
{
  int saturation = 255;
  Elements array;
  for (int value = 0; value < 255; value += 16) {
    Elements line;
    for (int hue = 0; hue < 255; hue += 6) {
      line.push_back(text("▀")                                    //
                     | color(Color::HSV(hue, saturation, value))  //
                     | bgcolor(Color::HSV(hue, saturation, value + 8)));
    }
    array.push_back(hbox(std::move(line)));
  }
  true_color_display = vbox({
                           true_color_display,
                           separator(),
                           vbox(std::move(array)),
                       }) |
                       border;
}

return flexbox(
    {
        basic_color_display,
        palette_256_color_display,
        true_color_display,
    },
    FlexboxConfig().SetGap(1, 1));

});

// ---------------------------------------------------------------------------
// Gauges
// ---------------------------------------------------------------------------
auto render_gauge = [&shift](int delta) {
float progress = (shift + delta) % 500 / 500.f;
return hbox({
text(std::to_string(int(progress * 100)) + "% ") |
size(WIDTH, EQUAL, 5),
gauge(progress),
});
};

auto gauge_component = Renderer([render_gauge] {
return vbox({
render_gauge(0) | color(Color::Black),
render_gauge(100) | color(Color::GrayDark),
render_gauge(50) | color(Color::GrayLight),
render_gauge(6894) | color(Color::White),
separator(),
render_gauge(6841) | color(Color::Blue),
render_gauge(9813) | color(Color::BlueLight),
render_gauge(98765) | color(Color::Cyan),
render_gauge(98) | color(Color::CyanLight),
render_gauge(9846) | color(Color::Green),
render_gauge(1122) | color(Color::GreenLight),
render_gauge(84) | color(Color::Magenta),
render_gauge(645) | color(Color::MagentaLight),
render_gauge(568) | color(Color::Red),
render_gauge(2222) | color(Color::RedLight),
render_gauge(220) | color(Color::Yellow),
render_gauge(348) | color(Color::YellowLight),
});
});

// ---------------------------------------------------------------------------
// Paragraph
// ---------------------------------------------------------------------------
auto make_box = [](size_t dimx, size_t dimy) {
std::string title = std::to_string(dimx) + "x" + std::to_string(dimy);
return window(text(title) | hcenter | bold,
text("content") | hcenter | dim) |
size(WIDTH, EQUAL, dimx) | size(HEIGHT, EQUAL, dimy);
};

auto paragraph_renderer_left = Renderer([&] {
std::string str =
"Lorem Ipsum is simply dummy text of the printing and typesetting "
"industry. Lorem Ipsum has been the industry's standard dummy text "
"ever since the 1500s, when an unknown printer took a galley of type "
"and scrambled it to make a type specimen book.";
return vbox({
window(text("Align left:"), paragraphAlignLeft(str)),
window(text("Align center:"), paragraphAlignCenter(str)),
window(text("Align right:"), paragraphAlignRight(str)),
window(text("Align justify:"), paragraphAlignJustify(str)),
window(text("Side by side"), hbox({
paragraph(str),
separator(),
paragraph(str),
})),
window(text("Elements with different size:"),
flexbox({
make_box(10, 5),
make_box(9, 4),
make_box(8, 4),
make_box(6, 3),
make_box(10, 5),
make_box(9, 4),
make_box(8, 4),
make_box(6, 3),
make_box(10, 5),
make_box(9, 4),
make_box(8, 4),
make_box(6, 3),
})),
}) |
vscroll_indicator | yframe | flex;
});

auto paragraph_renderer_right = Renderer([] {
return paragraph("<--- This vertical bar is resizable using the mouse") |
center;
});

int paragraph_renderer_split_position = Terminal::Size().dimx / 2;
auto paragraph_renderer_group =
ResizableSplitLeft(paragraph_renderer_left, paragraph_renderer_right,
&paragraph_renderer_split_position);
auto paragraph_renderer_group_renderer =
Renderer(paragraph_renderer_group,
[&] { return paragraph_renderer_group->Render(); });

// ---------------------------------------------------------------------------
// Tabs
// ---------------------------------------------------------------------------

int tab_index = 0;
std::vectorstd::string tab_entries = {
"htop", "color", "spinner", "gauge", "compiler", "paragraph",
};
auto tab_selection =
Menu(&tab_entries, &tab_index, MenuOption::HorizontalAnimated());
auto tab_content = Container::Tab(
{
htop,
color_tab_renderer,
spinner_tab_renderer,
gauge_component,
compiler_renderer,
paragraph_renderer_group_renderer,
},
&tab_index);

auto exit_button = Button(
"Exit", [&] { screen.Exit(); }, ButtonOption::Animated());

auto main_container = Container::Vertical({
Container::Horizontal({
tab_selection,
exit_button,
}),
tab_content,
});

auto main_renderer = Renderer(main_container, [&] {
return vbox({
text("FTXUI Demo") | bold | hcenter,
hbox({
tab_selection->Render() | flex,
exit_button->Render(),
}),
tab_content->Render() | flex,
});
});

std::atomic refresh_ui_continue = true;
std::thread refresh_ui([&] {
while (refresh_ui_continue) {
using namespace std::chrono_literals;
std::this_thread::sleep_for(0.05s);
// The |shift| variable belong to the main thread. screen.Post(task)
// will execute the update on the thread where |screen| lives (e.g. the
// main thread). Using screen.Post(task) is threadsafe.
screen.Post([&] { shift++; });
// After updating the state, request a new frame to be drawn. This is done
// by simulating a new "custom" event to be handled.
screen.Post(Event::Custom);
}
});

screen.Loop(main_renderer);
refresh_ui_continue = false;
refresh_ui.join();

return 0;
}

[ArthurSonzogni]

Hello!

Here is an answer:
#757 (comment)

Does it work?

[pat-RR-ick]

Yes this worked! Thanks! I went ahead made a simple demo if other people want to use it with scrollable and dynamically updated table with data.

https://github.com/pat-RR-ick/ftxui-trading-terminal-example

Thanks @ArthurSonzogni !