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<div class="headertitle"><div class="title">node.cpp</div></div>
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<a href="node_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="comment">// Copyright 2020 Arthur Sonzogni. All rights reserved.</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// 本原始碼的使用受 MIT 授權條款約束，詳情請參閱 LICENSE 檔案。</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="preprocessor">#include &lt;<a class="code" href="box_8hpp.html">ftxui/screen/box.hpp</a>&gt;</span> <span class="comment">// for Box</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#include &lt;string&gt;</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#include &lt;utility&gt;</span> <span class="comment">// for move</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include &lt;cstddef&gt;</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include &quot;<a class="code" href="node_8hpp.html">ftxui/dom/node.hpp</a>&quot;</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include &quot;<a class="code" href="selection_8hpp.html">ftxui/dom/selection.hpp</a>&quot;</span> <span class="comment">// for Selection</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include &quot;<a class="code" href="screen_8hpp.html">ftxui/screen/screen.hpp</a>&quot;</span> <span class="comment">// for Screen</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> </div>
<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>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><a class="code hl_function" href="group__dom.html#a0d313fac56abd7ebe58a17f1530b879e">Node::Node</a>() = <span class="keywordflow">default</span>;</div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"><a class="line" href="group__dom.html#a19fa1eae4c02e514c62a95e395b383a1"> 15</a></span><a class="code hl_function" href="group__dom.html#a0d313fac56abd7ebe58a17f1530b879e">Node::Node</a>(<a class="code hl_typedef" href="namespaceftxui.html#a5d4aa06ca6cc6a72e981bd5386f93f0a">Elements</a> children) : children_(std::move(children)) {}</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><a class="code hl_function" href="group__dom.html#a6fa6bf60f34f1e3efb0e59333428c9c8">Node::~Node</a>() = <span class="keywordflow">default</span>;</div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment">/// @brief 計算元素所需的空間大小。</span></div>
<div class="foldopen" id="foldopen00019" data-start="{" data-end="}">
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"><a class="line" href="group__dom.html#a40bd818c5de23bb2d208360d275ae59d"> 19</a></span><span class="comment"></span><span class="keywordtype">void</span> <a class="code hl_function" href="group__dom.html#a40bd818c5de23bb2d208360d275ae59d">Node::ComputeRequirement</a>() {</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <span class="keywordflow">if</span> (<a class="code hl_variable" href="group__dom.html#a2aeb117dade3254694355ab90e9fc566">children_</a>.empty()) {</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> }</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; child : <a class="code hl_variable" href="group__dom.html#a2aeb117dade3254694355ab90e9fc566">children_</a>) {</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> child-&gt;ComputeRequirement();</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> }</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// 預設情況下，需求是第一個子節點的需求。</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <a class="code hl_variable" href="group__dom.html#a3530d99687053ce0d0006b9dee9a1ca7">requirement_</a> = <a class="code hl_variable" href="group__dom.html#a2aeb117dade3254694355ab90e9fc566">children_</a>[0]-&gt;requirement();</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// 傳播焦點需求。</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 1; i &lt; <a class="code hl_variable" href="group__dom.html#a2aeb117dade3254694355ab90e9fc566">children_</a>.size(); ++i) {</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="keywordflow">if</span> (!<a class="code hl_variable" href="group__dom.html#a3530d99687053ce0d0006b9dee9a1ca7">requirement_</a>.<a class="code hl_variable" href="group__dom.html#aa4da656616dd87d4e82a4ee718db6b3c">focused</a>.<a class="code hl_variable" href="structftxui_1_1Requirement_1_1Focused.html#a8740ba80e30dd75e71d09fa1dcf04f3d">enabled</a> &amp;&amp;</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <a class="code hl_variable" href="group__dom.html#a2aeb117dade3254694355ab90e9fc566">children_</a>[i]-&gt;requirement().focused.enabled) {</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> <a class="code hl_variable" href="group__dom.html#a3530d99687053ce0d0006b9dee9a1ca7">requirement_</a>.<a class="code hl_variable" href="group__dom.html#aa4da656616dd87d4e82a4ee718db6b3c">focused</a> = <a class="code hl_variable" href="group__dom.html#a2aeb117dade3254694355ab90e9fc566">children_</a>[i]-&gt;requirement().focused;</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> }</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> }</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span>}</div>
</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="comment"></span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment">/// @brief 為元素分配繪圖位置和尺寸。</span></div>
<div class="foldopen" id="foldopen00040" data-start="{" data-end="}">
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"><a class="line" href="group__dom.html#a2ed318aaadb07efc50e76fce1ccf9637"> 40</a></span><span class="comment"></span><span class="keywordtype">void</span> <a class="code hl_function" href="group__dom.html#a2ed318aaadb07efc50e76fce1ccf9637">Node::SetBox</a>(<a class="code hl_struct" href="group__screen.html#structftxui_1_1Box">Box</a> box) {</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <a class="code hl_variable" href="group__dom.html#aa7e7d30102945911407723a5cbcdfabc">box_</a> = box;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span>}</div>
</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment"></span> </div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="comment">/// @brief 計算元素的選取範圍。</span></div>
<div class="foldopen" id="foldopen00045" data-start="{" data-end="}">
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"><a class="line" href="group__dom.html#a05352f5a353f1e86630a978060e77305"> 45</a></span><span class="comment"></span><span class="keywordtype">void</span> <a class="code hl_function" href="group__dom.html#a05352f5a353f1e86630a978060e77305">Node::Select</a>(<a class="code hl_class" href="group__dom.html#classftxui_1_1Selection">Selection</a>&amp; selection) {</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="comment">// 如果此節點的 box_ 與選取範圍沒有交集，則不進行選取。</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="group__screen.html#a83d40499d9e8740c35dc2352c2ac84a8">Box::Intersection</a>(selection.<a class="code hl_function" href="group__dom.html#a03f5cc5dcad10fecb7a0b8203c86a13e">GetBox</a>(), <a class="code hl_variable" href="group__dom.html#aa7e7d30102945911407723a5cbcdfabc">box_</a>).IsEmpty()) {</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> }</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="comment">// 預設情況下，我們將選取延遲到子節點。</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; child : <a class="code hl_variable" href="group__dom.html#a2aeb117dade3254694355ab90e9fc566">children_</a>) {</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> child-&gt;Select(selection);</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> }</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span>}</div>
</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="comment"></span> </div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><span class="comment">/// @brief 在 ftxui::Screen 上顯示元素。</span></div>
<div class="foldopen" id="foldopen00058" data-start="{" data-end="}">
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"><a class="line" href="namespaceftxui.html#a9b583744cea45882e63b74a780b20a0f"> 58</a></span><span class="comment"></span> <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; child : children_) {</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> child-&gt;Render(screen);</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> }</div>
</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span>}</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="foldopen" id="foldopen00063" data-start="{" data-end="}">
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"><a class="line" href="group__dom.html#a5b71d891a102197f2856f53702425581"> 63</a></span><span class="keywordtype">void</span> Node::Check(<a class="code hl_struct" href="structftxui_1_1Node_1_1Status.html">Status</a>* status) {</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; child : children_) {</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> child-&gt;Check(status);</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> }</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> status-&gt;<a class="code hl_variable" href="structftxui_1_1Node_1_1Status.html#a0fffbfa5479a3b6d3ddf5ff13504a51c">need_iteration</a> |= (status-&gt;<a class="code hl_variable" href="structftxui_1_1Node_1_1Status.html#aa6371382c6b4224e577e14ea610ab9a9">iteration</a> == 0);</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span>}</div>
</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="foldopen" id="foldopen00070" data-start="{" data-end="}">
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"><a class="line" href="group__dom.html#a2c5cebe05557529299e649867b499680"> 70</a></span>std::string Node::GetSelectedContent(<a class="code hl_class" href="group__dom.html#classftxui_1_1Selection">Selection</a>&amp; selection) {</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> std::string content;</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; child : children_) {</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> content += child-&gt;GetSelectedContent(selection);</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> }</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keywordflow">return</span> content;</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span>}</div>
</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="comment"></span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="comment">/// @brief 在 ftxui::Screen 上顯示元素。</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span><span class="comment">/// @ingroup dom</span></div>
<div class="foldopen" id="foldopen00082" data-start="{" data-end="}">
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"><a class="line" href="group__dom.html#gad4b8aa9392f56ba41e2b421e046a7d83"> 82</a></span><span class="comment"></span><span class="keywordtype">void</span> <a class="code hl_function" href="group__dom.html#gad4b8aa9392f56ba41e2b421e046a7d83">Render</a>(Screen&amp; screen, <span class="keyword">const</span> Element&amp; element) {</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> Selection selection;</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <a class="code hl_function" href="group__dom.html#gad4b8aa9392f56ba41e2b421e046a7d83">Render</a>(screen, element.get(), selection);</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span>}</div>
</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span><span class="comment"></span> </div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span><span class="comment">/// @brief 在 ftxui::Screen 上顯示元素。</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span><span class="comment">/// @ingroup dom</span></div>
<div class="foldopen" id="foldopen00089" data-start="{" data-end="}">
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"><a class="line" href="group__dom.html#ga32a24db985fa1b37bf686b00f7e1b4ff"> 89</a></span><span class="comment"></span><span class="keywordtype">void</span> <a class="code hl_function" href="group__dom.html#gad4b8aa9392f56ba41e2b421e046a7d83">Render</a>(Screen&amp; screen, Node* node) {</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> Selection selection;</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <a class="code hl_function" href="group__dom.html#gad4b8aa9392f56ba41e2b421e046a7d83">Render</a>(screen, node, selection);</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span>}</div>
</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> </div>
<div class="foldopen" id="foldopen00094" data-start="{" data-end="}">
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"><a class="line" href="node_8cpp.html#ab35030b64136afa183d474d11bd1f6dd"> 94</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="group__dom.html#gad4b8aa9392f56ba41e2b421e046a7d83">Render</a>(Screen&amp; screen, Node* node, Selection&amp; selection) {</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> Box box;</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> box.x_min = 0;</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> box.y_min = 0;</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> box.x_max = screen.dimx() - 1;</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> box.y_max = screen.dimy() - 1;</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> </div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> Node::Status status;</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> node-&gt;Check(&amp;status);</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <span class="keyword">const</span> <span class="keywordtype">int</span> max_iterations = 20;</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> <span class="keywordflow">while</span> (status.need_iteration &amp;&amp; status.iteration &lt; max_iterations) {</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="comment">// 步驟 1：找出此元素想要的尺寸。</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> node-&gt;ComputeRequirement();</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="comment">// 步驟 2：為元素分配尺寸。</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> node-&gt;SetBox(box);</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <span class="comment">// 檢查元素是否需要佈局演算法的另一次迭代。</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> status.need_iteration = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> status.iteration++;</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> node-&gt;Check(&amp;status);</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> }</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> </div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <span class="comment">// 步驟 3：選取</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> <span class="keywordflow">if</span> (!selection.IsEmpty()) {</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> node-&gt;Select(selection);</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> }</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> </div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> <span class="keywordflow">if</span> (node-&gt;requirement().focused.enabled</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span>#<span class="keywordflow">if</span> defined(FTXUI_MICROSOFT_TERMINAL_FALLBACK)</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> <span class="comment">// 將游標設定到正確的位置，允許使用 CJK（中文、日文、韓文等）字元的使用者</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> <span class="comment">// 在正確的位置看到他們的 [輸入法編輯器]。請參閱 [問題]。</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> <span class="comment">//</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> <span class="comment">// [輸入法編輯器]：</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> <span class="comment">// https://zh.wikipedia.org/wiki/輸入法編輯器</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> <span class="comment">//</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="comment">// [問題]：</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> <span class="comment">// https://github.com/ArthurSonzogni/FTXUI/issues/2#issuecomment-505282355</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> <span class="comment">//</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> <span class="comment">// 遺憾的是，Microsoft 終端機無法正確處理隱藏游標。相反地，</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> <span class="comment">// 游標下方的字元會被隱藏，這是一個大問題。因此，我們無法啟用</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="comment">// 將游標設定到正確的位置。它將顯示在右下角。</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> <span class="comment">// 請參閱：</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> <span class="comment">// https://github.com/microsoft/terminal/issues/1203</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> <span class="comment">// https://github.com/microsoft/terminal/issues/3093</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> &amp;&amp;</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> node-&gt;requirement().focused.cursor_shape != Screen::Cursor::Shape::Hidden</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span>#endif</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> ) {</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> screen.SetCursor(Screen::Cursor{</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> node-&gt;requirement().focused.node-&gt;box_.x_max,</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> node-&gt;requirement().focused.node-&gt;box_.y_max,</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> node-&gt;requirement().focused.cursor_shape,</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> });</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> screen.SetCursor(Screen::Cursor{</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> screen.dimx() - 1,</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> screen.dimy() - 1,</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> Screen::Cursor::Shape::Hidden,</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> });</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> }</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> </div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="comment">// 步驟 4：繪製元素。</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> screen.stencil = box;</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> node-&gt;Render(screen);</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> <span class="comment">// 步驟 5：應用著色器</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> screen.ApplyShader();</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span>}</div>
</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="foldopen" id="foldopen00164" data-start="{" data-end="}">
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"><a class="line" href="node_8cpp.html#a1a3d5804148186b3d4bcc07391ba5f30"> 164</a></span>std::string <a class="code hl_function" href="node_8cpp.html#a1a3d5804148186b3d4bcc07391ba5f30">GetNodeSelectedContent</a>(Screen&amp; screen,</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> Node* node,</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> Selection&amp; selection) {</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> Box box;</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> box.x_min = 0;</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> box.y_min = 0;</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> box.x_max = screen.dimx() - 1;</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> box.y_max = screen.dimy() - 1;</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> </div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> Node::Status status;</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> node-&gt;Check(&amp;status);</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> <span class="keyword">const</span> <span class="keywordtype">int</span> max_iterations = 20;</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> <span class="keywordflow">while</span> (status.need_iteration &amp;&amp; status.iteration &lt; max_iterations) {</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> <span class="comment">// 步驟 1：找出此元素想要的尺寸。</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> node-&gt;ComputeRequirement();</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> </div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> <span class="comment">// 步驟 2：為元素分配尺寸。</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> node-&gt;SetBox(box);</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> </div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> <span class="comment">// 檢查元素是否需要佈局演算法的另一次迭代。</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> status.need_iteration = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> status.iteration++;</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> node-&gt;Check(&amp;status);</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> }</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> </div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> <span class="comment">// 步驟 3：選取</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> node-&gt;Select(selection);</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> </div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> <span class="comment">// 步驟 4：取得選取的內容。</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> <span class="keywordflow">return</span> node-&gt;GetSelectedContent(selection);</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span>}</div>
</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> </div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span>} <span class="comment">// namespace ftxui</span></div>
<div class="ttc" id="abox_8hpp_html"><div class="ttname"><a href="box_8hpp.html">box.hpp</a></div></div>
<div class="ttc" id="agroup__dom_html_a03f5cc5dcad10fecb7a0b8203c86a13e"><div class="ttname"><a href="group__dom.html#a03f5cc5dcad10fecb7a0b8203c86a13e">ftxui::Selection::GetBox</a></div><div class="ttdeci">const Box &amp; GetBox() const</div><div class="ttdoc">取得選取範圍的方塊。</div><div class="ttdef"><b>Definition</b> <a href="src_2ftxui_2dom_2selection_8cpp_source.html#l00066">src/ftxui/dom/selection.cpp:66</a></div></div>
<div class="ttc" id="agroup__dom_html_a05352f5a353f1e86630a978060e77305"><div class="ttname"><a href="group__dom.html#a05352f5a353f1e86630a978060e77305">ftxui::Node::Select</a></div><div class="ttdeci">virtual void Select(Selection &amp;selection)</div><div class="ttdoc">計算元素的選取範圍。</div><div class="ttdef"><b>Definition</b> <a href="#l00045">node.cpp:45</a></div></div>
<div class="ttc" id="agroup__dom_html_a0d313fac56abd7ebe58a17f1530b879e"><div class="ttname"><a href="group__dom.html#a0d313fac56abd7ebe58a17f1530b879e">ftxui::Node::Node</a></div><div class="ttdeci">Node()</div></div>
<div class="ttc" id="agroup__dom_html_a2aeb117dade3254694355ab90e9fc566"><div class="ttname"><a href="group__dom.html#a2aeb117dade3254694355ab90e9fc566">ftxui::Node::children_</a></div><div class="ttdeci">Elements children_</div><div class="ttdef"><b>Definition</b> <a href="node_8hpp_source.html#l00074">node.hpp:74</a></div></div>
<div class="ttc" id="agroup__dom_html_a2ed318aaadb07efc50e76fce1ccf9637"><div class="ttname"><a href="group__dom.html#a2ed318aaadb07efc50e76fce1ccf9637">ftxui::Node::SetBox</a></div><div class="ttdeci">virtual void SetBox(Box box)</div><div class="ttdoc">為元素分配繪圖位置和尺寸。</div><div class="ttdef"><b>Definition</b> <a href="#l00040">node.cpp:40</a></div></div>
<div class="ttc" id="agroup__dom_html_a3530d99687053ce0d0006b9dee9a1ca7"><div class="ttname"><a href="group__dom.html#a3530d99687053ce0d0006b9dee9a1ca7">ftxui::Node::requirement_</a></div><div class="ttdeci">Requirement requirement_</div><div class="ttdef"><b>Definition</b> <a href="node_8hpp_source.html#l00075">node.hpp:75</a></div></div>
<div class="ttc" id="agroup__dom_html_a40bd818c5de23bb2d208360d275ae59d"><div class="ttname"><a href="group__dom.html#a40bd818c5de23bb2d208360d275ae59d">ftxui::Node::ComputeRequirement</a></div><div class="ttdeci">virtual void ComputeRequirement()</div><div class="ttdoc">計算元素所需的空間大小。</div><div class="ttdef"><b>Definition</b> <a href="#l00019">node.cpp:19</a></div></div>
<div class="ttc" id="agroup__dom_html_a6fa6bf60f34f1e3efb0e59333428c9c8"><div class="ttname"><a href="group__dom.html#a6fa6bf60f34f1e3efb0e59333428c9c8">ftxui::Node::~Node</a></div><div class="ttdeci">virtual ~Node()</div></div>
<div class="ttc" id="agroup__dom_html_aa4da656616dd87d4e82a4ee718db6b3c"><div class="ttname"><a href="group__dom.html#aa4da656616dd87d4e82a4ee718db6b3c">ftxui::Requirement::focused</a></div><div class="ttdeci">Focused focused</div><div class="ttdef"><b>Definition</b> <a href="requirement_8hpp_source.html#l00049">requirement.hpp:49</a></div></div>
<div class="ttc" id="agroup__dom_html_aa7e7d30102945911407723a5cbcdfabc"><div class="ttname"><a href="group__dom.html#aa7e7d30102945911407723a5cbcdfabc">ftxui::Node::box_</a></div><div class="ttdeci">Box box_</div><div class="ttdef"><b>Definition</b> <a href="node_8hpp_source.html#l00076">node.hpp:76</a></div></div>
<div class="ttc" id="agroup__dom_html_classftxui_1_1Selection"><div class="ttname"><a href="group__dom.html#classftxui_1_1Selection">ftxui::Selection</a></div><div class="ttdoc">表示終端機使用者介面中的選取範圍。</div><div class="ttdef"><b>Definition</b> <a href="selection_8hpp_source.html#l00021">selection.hpp:21</a></div></div>
<div class="ttc" id="agroup__dom_html_gad4b8aa9392f56ba41e2b421e046a7d83"><div class="ttname"><a href="group__dom.html#gad4b8aa9392f56ba41e2b421e046a7d83">Render</a></div><div class="ttdeci">void Render(Screen &amp;screen, const Element &amp;element)</div><div class="ttdoc">在 ftxui::Screen 上顯示元素。</div><div class="ttdef"><b>Definition</b> <a href="#l00082">node.cpp:82</a></div></div>
<div class="ttc" id="agroup__screen_html_a83d40499d9e8740c35dc2352c2ac84a8"><div class="ttname"><a href="group__screen.html#a83d40499d9e8740c35dc2352c2ac84a8">ftxui::Box::Intersection</a></div><div class="ttdeci">static auto Intersection(Box a, Box b) -&gt; Box</div><div class="ttdef"><b>Definition</b> <a href="box_8cpp_source.html#l00011">box.cpp:11</a></div></div>
<div class="ttc" id="agroup__screen_html_structftxui_1_1Box"><div class="ttname"><a href="group__screen.html#structftxui_1_1Box">ftxui::Box</a></div><div class="ttdoc">Box 是一個表示二維空間中矩形區域的結構。</div><div class="ttdef"><b>Definition</b> <a href="box_8hpp_source.html#l00014">box.hpp:14</a></div></div>
<div class="ttc" id="anamespaceftxui_html"><div class="ttname"><a href="namespaceftxui.html">ftxui</a></div><div class="ttdoc">FTXUI 的 ftxui:: 命名空間</div><div class="ttdef"><b>Definition</b> <a href="animation_8hpp_source.html#l00010">animation.hpp:10</a></div></div>
<div class="ttc" id="anamespaceftxui_html_a5d4aa06ca6cc6a72e981bd5386f93f0a"><div class="ttname"><a href="namespaceftxui.html#a5d4aa06ca6cc6a72e981bd5386f93f0a">ftxui::Elements</a></div><div class="ttdeci">std::vector&lt; Element &gt; Elements</div><div class="ttdef"><b>Definition</b> <a href="elements_8hpp_source.html#l00023">elements.hpp:23</a></div></div>
<div class="ttc" id="anode_8cpp_html_a1a3d5804148186b3d4bcc07391ba5f30"><div class="ttname"><a href="node_8cpp.html#a1a3d5804148186b3d4bcc07391ba5f30">GetNodeSelectedContent</a></div><div class="ttdeci">std::string GetNodeSelectedContent(Screen &amp;screen, Node *node, Selection &amp;selection)</div><div class="ttdef"><b>Definition</b> <a href="#l00164">node.cpp:164</a></div></div>
<div class="ttc" id="anode_8hpp_html"><div class="ttname"><a href="node_8hpp.html">node.hpp</a></div></div>
<div class="ttc" id="ascreen_8hpp_html"><div class="ttname"><a href="screen_8hpp.html">screen.hpp</a></div></div>
<div class="ttc" id="aselection_8hpp_html"><div class="ttname"><a href="selection_8hpp.html">selection.hpp</a></div></div>
<div class="ttc" id="astructftxui_1_1Node_1_1Status_html"><div class="ttname"><a href="structftxui_1_1Node_1_1Status.html">ftxui::Node::Status</a></div><div class="ttdef"><b>Definition</b> <a href="node_8hpp_source.html#l00065">node.hpp:65</a></div></div>
<div class="ttc" id="astructftxui_1_1Node_1_1Status_html_a0fffbfa5479a3b6d3ddf5ff13504a51c"><div class="ttname"><a href="structftxui_1_1Node_1_1Status.html#a0fffbfa5479a3b6d3ddf5ff13504a51c">ftxui::Node::Status::need_iteration</a></div><div class="ttdeci">bool need_iteration</div><div class="ttdef"><b>Definition</b> <a href="node_8hpp_source.html#l00067">node.hpp:67</a></div></div>
<div class="ttc" id="astructftxui_1_1Node_1_1Status_html_aa6371382c6b4224e577e14ea610ab9a9"><div class="ttname"><a href="structftxui_1_1Node_1_1Status.html#aa6371382c6b4224e577e14ea610ab9a9">ftxui::Node::Status::iteration</a></div><div class="ttdeci">int iteration</div><div class="ttdef"><b>Definition</b> <a href="node_8hpp_source.html#l00066">node.hpp:66</a></div></div>
<div class="ttc" id="astructftxui_1_1Requirement_1_1Focused_html_a8740ba80e30dd75e71d09fa1dcf04f3d"><div class="ttname"><a href="structftxui_1_1Requirement_1_1Focused.html#a8740ba80e30dd75e71d09fa1dcf04f3d">ftxui::Requirement::Focused::enabled</a></div><div class="ttdeci">bool enabled</div><div class="ttdef"><b>Definition</b> <a href="requirement_8hpp_source.html#l00029">requirement.hpp:29</a></div></div>
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