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352 lines
15 KiB
HTML
352 lines
15 KiB
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<div id="projectbrief">C++ functional terminal UI.</div>
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<div><div class="header">
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<div class="headertitle"><div class="title">FTXUI 中的 POSIX 管道输入</div></div>
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</div><!--header-->
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<div class="contents">
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<div class="textblock"><p><a class="anchor" id="ftxui-中的-posix-管道输入"></a></p>
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<dl class="section warning"><dt>警告</dt><dd>此功能仅适用于 Linux 和 macOS。Windows 和 WebAssembly 不支持此功能。</dd></dl>
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<h1><a class="anchor" id="什么是-posix-管道"></a>
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什么是 POSIX 管道？</h1>
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<p>POSIX 管道是两个独立程序之间通信的一种方式。一个程序将其输出直接作为另一个程序的输入。可以把它想象成一个单向的数据传输管道。</p>
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<p><b>示例：</b></p>
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<p>假设您想列出文件然后以交互方式过滤它们。</p>
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<ul>
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<li><code>ls</code>：列出文件。</li>
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<li><code>interactive_grep</code>：一个 FTXUI 应用程序，用于过滤文本并允许您键入。</li>
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</ul>
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<p>您可以使用管道 (<code>|</code>) 连接它们：</p>
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<div class="fragment"><div class="line">ls -l | interactive_grep</div>
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</div><!-- fragment --><p>以下是发生的情况：</p><ol type="1">
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<li><code>ls -l</code> 列出文件详细信息。</li>
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<li><code>|</code> 将此列表直接发送到 <code>interactive_grep</code>。</li>
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<li><code>interactive_grep</code> 接收列表并显示它。因为这是一个 FTXUI 应用程序，所以您可以键入以过滤列表，即使它从 <code>ls</code> 接收了初始数据。</li>
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</ol>
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<h1><a class="anchor" id="ftxui-如何处理管道输入"></a>
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FTXUI 如何处理管道输入</h1>
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<p>现在您了解了什么是 POSIX 管道，接下来让我们看看 FTXUI 如何使用它们。</p>
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<p>FTXUI 允许您的应用程序从其他程序（例如来自管道）读取数据，同时仍允许您使用键盘进行交互。这对于处理数据的交互式命令行工具非常有用。</p>
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<p>通常，FTXUI 应用程序从 <code>stdin</code> 接收所有输入。但是，当 FTXUI 检测到 <code>stdin</code> 连接到管道的输出时（意味着数据正在通过管道输入到您的应用程序中），它会自动切换到从 <code>/dev/tty</code> 读取交互式键盘输入。这可确保您的应用程序即使在处理管道数据时仍能接收用户输入。</p>
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<p>此功能 **默认开启**。</p>
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<p>如果您的 FTXUI 应用程序需要读取管道数据并响应键盘输入，您通常不需要做任何特殊的事情：</p>
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<div class="fragment"><div class="line"><span class="keyword">auto</span> screen = ScreenInteractive::Fullscreen();</div>
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<div class="line"><span class="comment">// screen.HandlePipedInput(true); // 此功能默认开启</span></div>
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<div class="line">screen.Loop(component);</div>
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</div><!-- fragment --><h1><a class="anchor" id="关闭管道输入"></a>
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关闭管道输入</h1>
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<p>如果您不需要此功能，或者它与您的自定义输入处理冲突，则可以将其关闭。</p>
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<p>要禁用它，请在启动应用程序的主循环之前调用 <code>HandlePipedInput(false)</code>：</p>
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<div class="fragment"><div class="line"><span class="keyword">auto</span> screen = ScreenInteractive::Fullscreen();</div>
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<div class="line">screen.HandlePipedInput(<span class="keyword">false</span>); <span class="comment">// 关闭管道输入处理</span></div>
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