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<div id="projectbrief">C++ functional terminal UI.</div>
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<div><div class="header">
<div class="headertitle"><div class="title">ftxui / screen</div></div>
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<div class="contents">
<div class="toc"><h3>Table of Contents</h3>
<ul>
<li class="level1">
<a href="#ftxuiscreen-1">ftxui::Screen</a>
</li>
<li class="level1">
<a href="#ftxuidimension">ftxui::Dimension</a>
</li>
<li class="level1">
<a href="#ftxuipixel">ftxui::Pixel</a>
</li>
<li class="level1">
<a href="#ftxuicolor">ftxui::Color</a>
</li>
</ul>
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<div class="textblock"><p><img src="https://nsm09.casimages.com/img/2025/05/31//2505310207423242518595348.png" alt="title-img" class="inline"/></p>
<p>The <code>ftxui::screen</code> module is the low-level foundation. It can be used standalone, but it is primarily designed to be used together by <a href="module-dom.html">ftxui::dom</a> and <a href="module-component.html">ftxui::component</a> modules.</p>
<p>It provides a <a class="el" href="group__screen.html#classftxui_1_1Screen">ftxui::Screen</a>.</p>
<hr />
<h1><a class="anchor" id="ftxuiscreen-1"></a>
ftxui::Screen</h1>
<p>The <a class="el" href="group__screen.html#classftxui_1_1Screen">ftxui::Screen</a> class represents a 2D grid of styled characters that can be rendered to a terminal. <br />
It provides methods to create a screen, access pixels, and render elements.</p>
<p>You can access the individual cells (<a class="el" href="group__screen.html#structftxui_1_1Pixel">ftxui::Pixel</a>) of the screen using the <a class="el" href="group__screen.html#a483f8ee1967e200cfc9e277b3ce00174">ftxui::Screen::PixelAt</a> method, which returns a reference to the pixel at the specified coordinates.</p>
<p><b>Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="screen_8hpp.html">ftxui/screen/screen.hpp</a>&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;<a class="code" href="color_8hpp.html">ftxui/screen/color.hpp</a>&gt;</span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> <a class="code hl_function" href="examples_2component_2button_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
<div class="line"> <span class="keyword">auto</span> screen = <a class="code hl_function" href="group__screen.html#a32b98be0603ace46d6dc9d05b330a9fd">ftxui::Screen::Create</a>(</div>
<div class="line"> ftxui::Dimension::Full(), <span class="comment">// Use full terminal width</span></div>
<div class="line"> ftxui::Dimension::Fixed(10) <span class="comment">// Fixed height of 10 rows</span></div>
<div class="line"> );</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Access a specific pixel at (10, 5)</span></div>
<div class="line"> <span class="keyword">auto</span>&amp; pixel = screen.PixelAt(10, 5);</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Set properties of the pixel.</span></div>
<div class="line"> pixel.character = U<span class="charliteral">&#39;X&#39;</span>;</div>
<div class="line"> pixel.foreground_color = <a class="code hl_enumvalue" href="group__screen.html#ae2b6d9670960e89c66d7b76167a0802fad3163c1fcda01965b692ec2c3122b743">ftxui::Color::Red</a>;</div>
<div class="line"> pixel.background_color = <a class="code hl_function" href="group__screen.html#aacec69e0aa1063fbec2cc305e7b076dd">ftxui::Color::RGB</a>(0, 255, 0);</div>
<div class="line"> pixel.bold = <span class="keyword">true</span>; <span class="comment">// Set bold style</span></div>
<div class="line"> screen.Print(); <span class="comment">// Print the screen to the terminal</span></div>
<div class="line">}</div>
<div class="ttc" id="acolor_8hpp_html"><div class="ttname"><a href="color_8hpp.html">color.hpp</a></div></div>
<div class="ttc" id="aexamples_2component_2button_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="examples_2component_2button_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdef"><b>Definition</b> <a href="examples_2component_2button_8cpp_source.html#l00004">examples/component/button.cpp:4</a></div></div>
<div class="ttc" id="agroup__screen_html_a32b98be0603ace46d6dc9d05b330a9fd"><div class="ttname"><a href="group__screen.html#a32b98be0603ace46d6dc9d05b330a9fd">ftxui::Screen::Create</a></div><div class="ttdeci">static Screen Create(Dimensions dimension)</div><div class="ttdoc">Create a screen with the given dimension.</div><div class="ttdef"><b>Definition</b> <a href="screen_8cpp_source.html#l00394">screen.cpp:394</a></div></div>
<div class="ttc" id="agroup__screen_html_aacec69e0aa1063fbec2cc305e7b076dd"><div class="ttname"><a href="group__screen.html#aacec69e0aa1063fbec2cc305e7b076dd">ftxui::Color::RGB</a></div><div class="ttdeci">static Color RGB(uint8_t red, uint8_t green, uint8_t blue)</div><div class="ttdoc">Build a Color from its RGB representation. https://en.wikipedia.org/wiki/RGB_color_model.</div><div class="ttdef"><b>Definition</b> <a href="screen_2color_8cpp_source.html#l00147">screen/color.cpp:147</a></div></div>
<div class="ttc" id="agroup__screen_html_ae2b6d9670960e89c66d7b76167a0802fad3163c1fcda01965b692ec2c3122b743"><div class="ttname"><a href="group__screen.html#ae2b6d9670960e89c66d7b76167a0802fad3163c1fcda01965b692ec2c3122b743">ftxui::Color::Red</a></div><div class="ttdeci">@ Red</div><div class="ttdef"><b>Definition</b> <a href="color_8hpp_source.html#l00055">color.hpp:55</a></div></div>
<div class="ttc" id="ascreen_8hpp_html"><div class="ttname"><a href="screen_8hpp.html">screen.hpp</a></div></div>
</div><!-- fragment --><dl class="section note"><dt>Note</dt><dd>If the coordinates are out of bounds, a dummy pixel is returned.</dd></dl>
<p>The screen can be printed to the terminal using <a class="el" href="group__screen.html#ad93edbe885499a712129356f1ffd506b">ftxui::Screen::Print()</a> or converted to a std::string with <a class="el" href="group__screen.html#a19c380b03cea21d7ac7325136a131ff0">ftxui::Screen::ToString()</a>.</p>
<div class="tabbed"></div><div class="tabbed"><ul>
<li><b class="tab-title">Print()</b> <div class="fragment"><div class="line"><span class="keyword">auto</span> screen = ...;</div>
<div class="line">screen.Print();</div>
</div><!-- fragment --></li>
<li><b class="tab-title">ToString()</b> <div class="fragment"><div class="line"><span class="keyword">auto</span> screen = ...;</div>
<div class="line">std::cout &lt;&lt; screen.ToString();</div>
</div><!-- fragment --></li>
</ul>
</div><div class="tabbed"></div><p>Note that you can reset the cursor position to the top-left corner of the screen after printing by calling ftxui::Screen::ResetCursorPosition().</p>
<p><b>Example</b> </p><div class="fragment"><div class="line"><span class="keyword">auto</span> screen = ...;</div>
<div class="line"><span class="keywordflow">while</span>(<span class="keyword">true</span>) {</div>
<div class="line"> <span class="comment">// Drawing operations:</span></div>
<div class="line"> ...</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Print the screen to the terminal. Then reset the cursor position and the</span></div>
<div class="line"> <span class="comment">// screen content.</span></div>
<div class="line"> std::cout &lt;&lt; screen.ToString();</div>
<div class="line"> std::cout &lt;&lt; screen.ResetCursorPosition(<span class="comment">/*clear=*/</span><span class="keyword">true</span>);</div>
<div class="line"> std::cout &lt;&lt; std::flush;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Sleep for a short duration to control the refresh rate.</span></div>
<div class="line"> std::this_thread::sleep_for(std::chrono::milliseconds(100));</div>
<div class="line">}</div>
</div><!-- fragment --><hr />
<h1><a class="anchor" id="ftxuidimension"></a>
ftxui::Dimension</h1>
<p>The <a class="el" href="namespaceftxui_1_1Dimension.html">ftxui::Dimension</a> utility controls screen sizing:</p>
<ul>
<li><code>Dimension::Full()</code> — use full terminal width or height</li>
<li><code>Dimension::Fit(element)</code> — size to fit the rendered <a class="el" href="namespaceftxui.html#a2bc31f2d685189e5c61d2293a1f51b4f">ftxui::Element</a></li>
<li><code>Dimension::Fixed(n)</code> — use exactly <code>n</code> columns or rows</li>
</ul>
<p>These values are to be passed to <code><a class="el" href="group__screen.html#a32b98be0603ace46d6dc9d05b330a9fd" title="Create a screen with the given dimension.">ftxui::Screen::Create()</a></code>.</p>
<p><a class="el" href="group__screen.html#a32b98be0603ace46d6dc9d05b330a9fd">ftxui::Screen::Create()</a> provides two overloads:</p>
<ul>
<li><code>Screen::Create(Dimension)</code> sets both width and height to the same kind of dimension</li>
<li><code>Screen::Create(Dimension width, Dimension height)</code> allows distinct control per axis</li>
</ul>
<div class="fragment"><div class="line"><span class="keyword">auto</span> screen = <a class="code hl_function" href="group__screen.html#a32b98be0603ace46d6dc9d05b330a9fd">ftxui::Screen::Create</a>(</div>
<div class="line"> ftxui::Dimension::Full(), <span class="comment">// width</span></div>
<div class="line"> ftxui::Dimension::Fixed(10) <span class="comment">// height</span></div>
<div class="line">);</div>
</div><!-- fragment --><p>Once created, render an element and display the result:</p>
<div class="fragment"><div class="line"><a class="code hl_function" href="group__dom.html#gad4b8aa9392f56ba41e2b421e046a7d83">ftxui::Render</a>(screen, element);</div>
<div class="line">screen.Print();</div>
<div class="ttc" id="agroup__dom_html_gad4b8aa9392f56ba41e2b421e046a7d83"><div class="ttname"><a href="group__dom.html#gad4b8aa9392f56ba41e2b421e046a7d83">ftxui::Render</a></div><div class="ttdeci">void Render(Screen &amp;screen, const Element &amp;element)</div><div class="ttdoc">Display an element on a ftxui::Screen.</div><div class="ttdef"><b>Definition</b> <a href="node_8cpp_source.html#l00084">node.cpp:84</a></div></div>
</div><!-- fragment --><hr />
<h1><a class="anchor" id="ftxuipixel"></a>
ftxui::Pixel</h1>
<p>Each cell in the screen grid is a <a class="el" href="group__screen.html#structftxui_1_1Pixel">ftxui::Pixel</a>, which holds:</p>
<ul>
<li>Unicode codepoint.<ul>
<li><code>character</code></li>
</ul>
</li>
<li>ftxui::Color:<ul>
<li><code>foreground_color</code></li>
<li><code>background_color</code></li>
</ul>
</li>
<li>Booleans:<ul>
<li><code>blink</code></li>
<li><code>bold</code></li>
<li><code>dim</code></li>
<li><code>italic</code></li>
<li><code>inverted</code> (swap foreground and background colors)</li>
<li><code>underlined</code></li>
<li><code>underlined_double</code></li>
<li><code>strikethrough</code></li>
</ul>
</li>
</ul>
<div class="fragment"><div class="line"><span class="keyword">auto</span> screen = <a class="code hl_function" href="group__screen.html#a32b98be0603ace46d6dc9d05b330a9fd">ftxui::Screen::Create</a>(</div>
<div class="line"> ftxui::Dimension::Fixed(5),</div>
<div class="line"> ftxui::Dimension::Fixed(5),</div>
<div class="line">);</div>
<div class="line"> </div>
<div class="line"><span class="keyword">auto</span>&amp; pixel = screen.PixelAt(3, 3);</div>
<div class="line">pixel.character = U<span class="charliteral">&#39;X&#39;</span>;</div>
<div class="line">pixel.bold = <span class="keyword">true</span>;</div>
<div class="line">pixel.foreground_color = <a class="code hl_enumvalue" href="group__screen.html#ae2b6d9670960e89c66d7b76167a0802fad3163c1fcda01965b692ec2c3122b743">ftxui::Color::Red</a>;</div>
<div class="line">pixel.background_color = <a class="code hl_function" href="group__screen.html#aacec69e0aa1063fbec2cc305e7b076dd">ftxui::Color::RGB</a>(0, 255, 0);</div>
<div class="line"> </div>
<div class="line">screen.Print();</div>
</div><!-- fragment --><dl class="section note"><dt>Note</dt><dd><code>PixelAt(x, y)</code> performs bounds checking and returns a reference to the pixel at the specified coordinate. If out-of-bounds, a dummy pixel reference is returned.</dd></dl>
<p>Each cell in the screen is a <a class="el" href="group__screen.html#structftxui_1_1Pixel">ftxui::Pixel</a>. You can modify them using:</p>
<div class="fragment"><div class="line"><span class="keyword">auto</span>&amp; pixel = screen.PixelAt(x, y);</div>
<div class="line">pixel.character = U<span class="charliteral">&#39;X&#39;</span>;</div>
<div class="line">pixel.bold = <span class="keyword">true</span>;</div>
<div class="line">pixel.foreground_color = Color::Red;</div>
</div><!-- fragment --><hr />
<h1><a class="anchor" id="ftxuicolor"></a>
ftxui::Color</h1>
<p>The <a class="el" href="group__screen.html#classftxui_1_1Color">ftxui::Color</a> class is used to define foreground and background colors for each <a class="el" href="group__screen.html#structftxui_1_1Pixel">ftxui::Pixel</a>.</p>
<p>It supports various color spaces and predefined palettes. FTXUI will dynamically fallback to the closest available color in the terminal if the requested color is not supported by the terminal.</p>
<p><b>Color Spaces</b></p>
<ul>
<li><b>Default</b>: <code><a class="el" href="group__screen.html#aa4be56f94fc180d7b070df23c235b0c7a79935518a3889663d8688b6b01fff051">ftxui::Color::Default</a></code> (terminal's default color)</li>
<li><b>16-color palette</b> <a href="https://arthursonzogni.github.io/FTXUI/examples/?file=dom/color_gallery">Demo</a>:<ul>
<li><code><a class="el" href="group__screen.html#ae2b6d9670960e89c66d7b76167a0802fac1e9bce8242f443c54c7405223d616cd">ftxui::Color::Black</a></code>,</li>
<li><code><a class="el" href="group__screen.html#ae2b6d9670960e89c66d7b76167a0802fad3163c1fcda01965b692ec2c3122b743">ftxui::Color::Red</a></code>,</li>
<li>...</li>
</ul>
</li>
<li><b>256-color palette</b> <a href="https://arthursonzogni.github.io/FTXUI/examples/?file=dom/color_palette256">Demo</a>:<ul>
<li><code><a class="el" href="group__screen.html#abd07c48f62cc507fafa2486a43130fcfa7d2d4cc3af6756a4eac7d12fbe4775d4">ftxui::Color::Chartreuse1</a></code>,</li>
<li><code><a class="el" href="group__screen.html#abd07c48f62cc507fafa2486a43130fcfa0c92c7e17edeca09b7c63c8a783a562f">ftxui::Color::DarkViolet</a></code>,</li>
<li>...</li>
</ul>
</li>
<li><b>True color</b> (24bit) [Demo](<a href="https://arthursonzogni.github.io/FTXUI/examples/?file=dom/color_truecolor_HSV:">https://arthursonzogni.github.io/FTXUI/examples/?file=dom/color_truecolor_HSV:</a><ul>
<li><code><a class="el" href="group__screen.html#aacec69e0aa1063fbec2cc305e7b076dd" title="Build a Color from its RGB representation. https://en.wikipedia.org/wiki/RGB_color_model.">ftxui::Color::RGB(uint8_t red, uint8_t green, uint8_t blue)</a></code></li>
<li><code><a class="el" href="group__screen.html#a1a119fd00beafc7d2aa5f94518e38fc5" title="Build a Color from its HSV representation. https://en.wikipedia.org/wiki/HSL_and_HSV.">ftxui::Color::HSV(uint8_t h, uint8_t s, uint8_t v)</a></code>.</li>
</ul>
</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>You can query the terminal capability using <a class="el" href="group__screen.html#gae6e034f37aa66cfe4458a8cb6e8fc526">ftxui::Terminal::ColorSupport()</a>; <br />
<br />
This can manually be set using <a class="el" href="group__dom.html#ga65945a706131f407a47a1b9960dc1a4a">ftxui::Terminal::SetColorSupport()</a>. </dd></dl>
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