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<div id="projectname">FTXUI
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 <span id="projectnumber">4.0.0</span>
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<div id="projectbrief">C++ functional terminal UI.</div>
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<div class="headertitle"><div class="title">maybe.cpp</div></div>
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<a href="maybe_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="preprocessor">#include <functional></span> <span class="comment">// for function</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="preprocessor">#include <memory></span> <span class="comment">// for make_unique, __shared_ptr_access, __shared_ptr_access<>::element_type, shared_ptr</span></div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="preprocessor">#include <type_traits></span> <span class="comment">// for remove_reference, remove_reference<>::type</span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#include <utility></span> <span class="comment">// for move</span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span> </div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="preprocessor">#include "<a class="code" href="component_8hpp.html">ftxui/component/component.hpp</a>"</span> <span class="comment">// for ComponentDecorator, Maybe, Make</span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include "<a class="code" href="component__base_8hpp.html">ftxui/component/component_base.hpp</a>"</span> <span class="comment">// for Component, ComponentBase</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include "<a class="code" href="event_8hpp.html">ftxui/component/event.hpp</a>"</span> <span class="comment">// for Event</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include "<a class="code" href="elements_8hpp.html">ftxui/dom/elements.hpp</a>"</span> <span class="comment">// for Element</span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include "<a class="code" href="node_8hpp.html">ftxui/dom/node.hpp</a>"</span> <span class="comment">// for Node</span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> </div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceftxui.html">ftxui</a> {</div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="foldopen" id="foldopen00014" data-start="{" data-end="}">
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"><a class="line" href="namespaceftxui.html#ac810d54ce70c21d3c7794a34feb85d1e"> 14</a></span><a class="code hl_typedef" href="namespaceftxui.html#af1479ede01dbf087342534ab4ada11d3">Component</a> <a class="code hl_function" href="namespaceftxui.html#a20b66a70c1cd4ff3f0ff571a4507d2b4">Maybe</a>(<a class="code hl_typedef" href="namespaceftxui.html#af1479ede01dbf087342534ab4ada11d3">Component</a> child, std::function<<span class="keywordtype">bool</span>()> show) {</div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">class </span>Impl : <span class="keyword">public</span> <a class="code hl_class" href="classftxui_1_1ComponentBase.html">ComponentBase</a> {</div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">public</span>:</div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">explicit</span> Impl(std::function<<span class="keywordtype">bool</span>()> show) : show_(std::move(show)) {}</div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> </div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">private</span>:</div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <a class="code hl_typedef" href="namespaceftxui.html#a2bc31f2d685189e5c61d2293a1f51b4f">Element</a> <a class="code hl_function" href="namespaceftxui.html#ad4b8aa9392f56ba41e2b421e046a7d83">Render</a>()<span class="keyword"> override </span>{</div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> <span class="keywordflow">return</span> show_() ? ComponentBase::Render() : std::make_unique<Node>();</div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> }</div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <span class="keywordtype">bool</span> Focusable()<span class="keyword"> const override </span>{</div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> <span class="keywordflow">return</span> show_() && ComponentBase::Focusable();</div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> }</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> <span class="keywordtype">bool</span> OnEvent(<a class="code hl_struct" href="structftxui_1_1Event.html">Event</a> event)<span class="keyword"> override </span>{</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="keywordflow">return</span> show_() && ComponentBase::OnEvent(event);</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> }</div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> std::function<bool()> show_;</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> };</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> </div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">auto</span> maybe = <a class="code hl_function" href="namespaceftxui.html#a2b8973dc71334f1d98e2e6f55de8b5ae">Make<Impl></a>(std::move(show));</div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> maybe->Add(std::move(child));</div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> <span class="keywordflow">return</span> maybe;</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span>}</div>
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</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="comment"></span> </div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="comment">/// @brief Decorate a component. It is shown only when the |show| function</span></div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment">/// returns true.</span></div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="comment">/// @params show a function returning whether the decoratorated component should</span></div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment">/// be shown.</span></div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment">/// @ingroup component</span></div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment">///</span></div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="comment">/// ### Example</span></div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="comment">///</span></div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="comment">/// ```cpp</span></div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="comment">/// auto component = Renderer([]{ return text("Hello World!"); });</span></div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="comment">/// auto maybe_component = component | Maybe([&]{ return counter == 42; });</span></div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="comment">/// ```</span></div>
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<div class="foldopen" id="foldopen00050" data-start="{" data-end="}">
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"><a class="line" href="namespaceftxui.html#ae39ad8b223e6bb7704c77a3708571a7d"> 50</a></span><span class="comment"></span><a class="code hl_typedef" href="namespaceftxui.html#af07b496fe512e3a4863ee546f19e9a6c">ComponentDecorator</a> <a class="code hl_function" href="namespaceftxui.html#a20b66a70c1cd4ff3f0ff571a4507d2b4">Maybe</a>(std::function<<span class="keywordtype">bool</span>()> show) {</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordflow">return</span> [show = std::move(show)](<a class="code hl_typedef" href="namespaceftxui.html#af1479ede01dbf087342534ab4ada11d3">Component</a> child) <span class="keyword">mutable</span> {</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceftxui.html#a20b66a70c1cd4ff3f0ff571a4507d2b4">Maybe</a>(std::move(child), std::move(show));</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> };</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span>}</div>
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</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="comment"></span> </div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="comment">/// @brief Decorate a component |child|. It is shown only when |show| is true.</span></div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><span class="comment">/// @params child the compoennt to decorate.</span></div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="comment">/// @params show a boolean. |child| is shown when |show| is true.</span></div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span><span class="comment">/// @ingroup component</span></div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="comment">///</span></div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="comment">/// ### Example</span></div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="comment">///</span></div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span><span class="comment">/// ```cpp</span></div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span><span class="comment">/// auto component = Renderer([]{ return text("Hello World!"); });</span></div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="comment">/// auto maybe_component = Maybe(component, &show);</span></div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="comment">/// ```</span></div>
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<div class="foldopen" id="foldopen00067" data-start="{" data-end="}">
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"><a class="line" href="namespaceftxui.html#a20b66a70c1cd4ff3f0ff571a4507d2b4"> 67</a></span><span class="comment"></span><a class="code hl_typedef" href="namespaceftxui.html#af1479ede01dbf087342534ab4ada11d3">Component</a> <a class="code hl_function" href="namespaceftxui.html#a20b66a70c1cd4ff3f0ff571a4507d2b4">Maybe</a>(<a class="code hl_typedef" href="namespaceftxui.html#af1479ede01dbf087342534ab4ada11d3">Component</a> child, <span class="keyword">const</span> <span class="keywordtype">bool</span>* show) {</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceftxui.html#a20b66a70c1cd4ff3f0ff571a4507d2b4">Maybe</a>(std::move(child), [show] { <span class="keywordflow">return</span> *show; });</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span>}</div>
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</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="comment"></span> </div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span><span class="comment">/// @brief Decorate a component. It is shown only when |show| is true.</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span><span class="comment">/// @params show a boolean. |child| is shown when |show| is true.</span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="comment">/// @ingroup component</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="comment">///</span></div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="comment">/// ### Example</span></div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="comment">///</span></div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span><span class="comment">/// ```cpp</span></div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span><span class="comment">/// auto component = Renderer([]{ return text("Hello World!"); });</span></div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="comment">/// auto maybe_component = component | Maybe(&show);</span></div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="comment">/// ```</span></div>
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<div class="foldopen" id="foldopen00081" data-start="{" data-end="}">
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"><a class="line" href="namespaceftxui.html#a83b6fd5e1524023722a7450f987f15d0"> 81</a></span><span class="comment"></span><a class="code hl_typedef" href="namespaceftxui.html#af07b496fe512e3a4863ee546f19e9a6c">ComponentDecorator</a> <a class="code hl_function" href="namespaceftxui.html#a20b66a70c1cd4ff3f0ff571a4507d2b4">Maybe</a>(<span class="keyword">const</span> <span class="keywordtype">bool</span>* show) {</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="keywordflow">return</span> [show](<a class="code hl_typedef" href="namespaceftxui.html#af1479ede01dbf087342534ab4ada11d3">Component</a> child) { <span class="keywordflow">return</span> <a class="code hl_function" href="namespaceftxui.html#a20b66a70c1cd4ff3f0ff571a4507d2b4">Maybe</a>(std::move(child), show); };</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span>}</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> </div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span>} <span class="comment">// namespace ftxui</span></div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span><span class="comment">// Copyright 2021 Arthur Sonzogni. All rights reserved.</span></div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span><span class="comment">// Use of this source code is governed by the MIT license that can be found in</span></div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span><span class="comment">// the LICENSE file.</span></div>
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<div class="ttc" id="aclassftxui_1_1ComponentBase_html"><div class="ttname"><a href="classftxui_1_1ComponentBase.html">ftxui::ComponentBase</a></div><div class="ttdoc">It implement rendering itself as ftxui::Element. It implement keyboard navigation by responding to ft...</div><div class="ttdef"><b>Definition</b> <a href="component__base_8hpp_source.html#l00027">component_base.hpp:27</a></div></div>
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<div class="ttc" id="acomponent_8hpp_html"><div class="ttname"><a href="component_8hpp.html">component.hpp</a></div></div>
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<div class="ttc" id="anamespaceftxui_html"><div class="ttname"><a href="namespaceftxui.html">ftxui</a></div><div class="ttdef"><b>Definition</b> <a href="animation_8hpp_source.html#l00009">animation.hpp:9</a></div></div>
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<div class="ttc" id="anamespaceftxui_html_a20b66a70c1cd4ff3f0ff571a4507d2b4"><div class="ttname"><a href="namespaceftxui.html#a20b66a70c1cd4ff3f0ff571a4507d2b4">ftxui::Maybe</a></div><div class="ttdeci">Component Maybe(Component, const bool *show)</div><div class="ttdoc">Decorate a component |child|. It is shown only when |show| is true. @params child the compoennt to de...</div><div class="ttdef"><b>Definition</b> <a href="#l00067">maybe.cpp:67</a></div></div>
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<div class="ttc" id="anamespaceftxui_html_a2b8973dc71334f1d98e2e6f55de8b5ae"><div class="ttname"><a href="namespaceftxui.html#a2b8973dc71334f1d98e2e6f55de8b5ae">ftxui::Make</a></div><div class="ttdeci">std::shared_ptr< T > Make(Args &&... args)</div><div class="ttdef"><b>Definition</b> <a href="component_8hpp_source.html#l00025">component.hpp:25</a></div></div>
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<div class="ttc" id="anamespaceftxui_html_a2bc31f2d685189e5c61d2293a1f51b4f"><div class="ttname"><a href="namespaceftxui.html#a2bc31f2d685189e5c61d2293a1f51b4f">ftxui::Element</a></div><div class="ttdeci">std::shared_ptr< Node > Element</div><div class="ttdef"><b>Definition</b> <a href="elements_8hpp_source.html#l00018">elements.hpp:18</a></div></div>
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<div class="ttc" id="anamespaceftxui_html_ad4b8aa9392f56ba41e2b421e046a7d83"><div class="ttname"><a href="namespaceftxui.html#ad4b8aa9392f56ba41e2b421e046a7d83">ftxui::Render</a></div><div class="ttdeci">void Render(Screen &screen, const Element &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#l00044">node.cpp:44</a></div></div>
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<div class="ttc" id="anamespaceftxui_html_af07b496fe512e3a4863ee546f19e9a6c"><div class="ttname"><a href="namespaceftxui.html#af07b496fe512e3a4863ee546f19e9a6c">ftxui::ComponentDecorator</a></div><div class="ttdeci">std::function< Component(Component)> ComponentDecorator</div><div class="ttdef"><b>Definition</b> <a href="component_8hpp_source.html#l00030">component.hpp:30</a></div></div>
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<div class="ttc" id="anamespaceftxui_html_af1479ede01dbf087342534ab4ada11d3"><div class="ttname"><a href="namespaceftxui.html#af1479ede01dbf087342534ab4ada11d3">ftxui::Component</a></div><div class="ttdeci">std::shared_ptr< ComponentBase > Component</div><div class="ttdef"><b>Definition</b> <a href="component__base_8hpp_source.html#l00021">component_base.hpp:21</a></div></div>
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<div class="ttc" id="anode_8hpp_html"><div class="ttname"><a href="node_8hpp.html">node.hpp</a></div></div>
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<div class="ttc" id="astructftxui_1_1Event_html"><div class="ttname"><a href="structftxui_1_1Event.html">ftxui::Event</a></div><div class="ttdoc">Represent an event. It can be key press event, a terminal resize, or more ...</div><div class="ttdef"><b>Definition</b> <a href="event_8hpp_source.html#l00026">event.hpp:26</a></div></div>
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